Mth pumps T31 series User manual

T31 SERIES

Section T31 Page 501

Dated July 2015

97-4621-01-588

Pump Manual

HORIZONTAL CLOSE COUPLED

FLEXIBLE COUPLED

Distributed in the UK by.....

Pump Engineering Limited. Unit B1, Riverside Industrial Estate,

Littlehampton, West Sussex, BN17 5DF, United Kingdom

Tel: 01903 730900 Fax: 01903 730234

email: [email protected] Web: www.pumpeng.co.uk

T31 SERIES

General Instructions

CLOSE COUPLED PUMPS

FLEXIBLE COUPLED PUMPS

A. Inspection of Equipment

B. Storage

C. Placing Stored Pumps Into Service

D. Application Considerations

E. Recommended Spare Parts

When properly installed and given

reasonable care and maintenance, re-

generative turbine pumps should operate

satisfactorily for many years. Because of

the high differential pressures expected

in a regenerative turbine pump, close

running clearances are used to reduce

internal losses. Abrasive particles, even

microscopic ones in high enough concen-

trations can open up the close clearances

between internal cavities. For critical

services it is recommended that you keep

an identical pump for stand-by use.

1A Inspection of Equipment

Immediately upon receipt of the shipment,

inspect the equipment for damage or

missing components. Check the shipping

manifest and report any damage or short-

age to the Transportation Company’s local

agent. Inspect the crate and any wrapping

material before discarding. Parts or acces-

sories are sometimes wrapped individually

or fastened to the skid.

Put the instructions that came with the

shipment in a safe place where they will

be available to those who will be using

them for installation and service.

1B Storage

If the pump is to be stored before use, it

should be inspected as described in 1A,

re-crated and stored in a dry location.

Standard shipping containers are not suit-

able for outdoor storage. In some areas,

it may be necessary to cover the pump’s

exterior surface with oil or other rust

inhibiting coating. All units are tested at

the factory with a water/corrosion inhibitor

solution, some of which will remain inside

the pump upon receipt. If units are ushed

out prior to storage, this inhibitor will be

removed and proper care must be taken

to prevent product deterioration from

improper storage.

For storage beyond 30 days, a corrosion

inhibiting protective uid should be added

to the internal pump cavities. Fluids used

in the pump should be selected for com-

patibility with pump materials. This is very

important when optional seal and gasket

materials have been used. Protective

caps on the inlet and outlets should also

be used. Caps alone are not sufcient

protection.

1C Placing Stored Pumps Into

Service

Special care must be taken when placing

stored pumps into service. First clean

the outside and ush out the inside with

a process compatible uid. Try to turn

the pump using the coupling or shaft. On

close coupled units, access to the shaft is

between the pump and motor. A vise grip

or other plier type gripping device may be

used directly on the shaft. Applying torque

to the motor fan blades is not recom-

mended. If the impeller does not break

loose immediately, ll the pump with a

process compatible uid and try again in a

few hours.

If this fails, loosen only the pump cover

thru bolts clamping the assembly together,

one full turn, no more. Fill the pump

with uid. Apply torque, 50 foot pounds

maximum, to the shaft. The pump should

turn before 50 foot pounds is reached.

If you are successful at breaking loose

the unit, continue turning the pump while

re-tightening the thru bolts to their original

positions.

If the unit still won’t turn over, DO NOT

apply further force. Refer to the Disassem-

bly/Reassembly Instructions in Section 5

to determine the cause of the problem.

1D Application Considerations

1D1 Electrical Wiring

All electrical equipment and wiring should

conform to Local and National Electrical

Codes. Use the motor manufacturer’s

instructions for connecting the motor. Note

the correct rotation and wiring diagrams

on the assembly. Make sure the motor

rotation and speed matches that required

for the pump. When making electrical

connections to motors provided with

threaded stud electrical terminals, the

recommended torque should be 13-16

inch-lbs. Applying torque in excess of this

range may cause damage.

1D2 Construction Materials

While it is reasonable to assume that

good judgment has been used in selecting

all the materials in the pump for compati-

bility with process uids, actual conditions

sometimes vary from original expec-

tations. Also, typical material selection

charts do not consider all the temperature,

pressure, and uid variables. The custom-

er’s engineer should be consulted for nal

judgment on the best materials for critical

process applications.

1D3 Valves

The rst valve to be considered for a

regenerative turbine pumping system

might be a pressure relief valve. Because

this type of pump has a horsepower

requirement similar to that of a positive

displacement pump (constantly rising

along with a pressure increase) a relief

valve can be effectively used to limit

horsepower. This is helpful when a

non-overloading motor is specied. It can

be of critical importance if the system ow

rate can vary widely. There are almost no

circumstances where a ow modulating

valve will work successfully in a regener-

ative turbine pumping system. The steep

pumping characteristic, typical of these

pumps, produces very large pressure

changes with small variations in ow rate.

As a result, the modulating ow from the

valve introduces sharp pressure shock

waves that shorten pump life and may

cause damage in other pieces of equip-

ment in the system.

If a shutoff valve is necessary in the

suction line, use a gate, ball, buttery,

or other full port valve. Globe or other

ow restricting valves can in some cases

reduce pump ow or increase chances of

cavitation.

A swing check valve is recommended in

the suction line even when the pump inlet

is only slightly higher than the uid source.

It should be the same size as the pump

inlet or sized based on reasonable uid

friction losses.

A foot valve is recommended when lifting

uid from a sump. This will save wear and

tear on any pump, even those equipped

with self priming equipment.

A Y-Strainer is recommended immediately

ahead of the pump on any newly con-

structed system. This is advisable due to

the probability that foreign material large

enough to damage pump clearances may

remain even though the piping has been

ushed.

Valves in the outlet piping of a regen-

erative turbine pump should always be

open as far as possible when the pump is

started. This will reduce the start-up load

on the pump and motor. Never start the

pump with the discharge valve closed.

Inlet valving should be open when starting

any pumping system. Without some uid

in the pump, it can gall and lock up im-

pellers. Violent pump failure will result

from continued operation with the inlet

valve closed.

1D4 Priming

Regardless of whether self-priming

equipment is used or not, always ll the

pump and vent it of air for best seal and

pump life. Under most circumstances,

regenerative turbine pumps can be made

to self-prime as long as a small amount

of uid can be recirculated through the

impeller and the uid doesn’t heat up

noticeably.

1D5 NPSH (Net Positive Suction Head)

The NPSH required varies with every

size and capacity of pump. The NPSH

required by your unit can be obtained from

the performance curves or from your MTH

representative.

If the NPSH available is not equal to or

greater than that required by the pump,

it must be increased or a different pump

Page 502

Page 503

selected. The usual method for increasing

NPSH is to raise the static head on the

pump inlet, (Hs).

By denition, NPSH means: “net positive

suction head” above the vapor pressure

of the pumped liquid available at the cen-

terline of the pump. It should always be

given in feet of pumped liquid. The NPSH

is actually a measurement of the amount

of energy available in the pumped liquid

to produce the required absolute entrance

velocity in the pump. If a pump requires

more energy (or NPSH) than is available

at a given capacity, the pressure at the in-

let will fall below the vapor pressure of the

pumped liquid and loss of performance

will result.

Ps= Pressure in the suction vessel in

PSIA.

Pvp = Vapor pressure of the pumped uid

in PSIA.

Hs = Static height of the pumped uid

above (+) or below (-) the centerline of the

pump.

Hf= All friction losses from the vessel to

the pump.

NPSH = 2.31( )+ Hs- Hf

For boiling liquids, Psand Pvp are equal.

This item then becomes zero and can be

omitted from the equation.

1D6 Noise

Regenerative turbine pumps typically pro-

duce a high pitched whine that increases

in intensity as the differential pressure pro-

duced in the pump increases. While high

frequency sound is attenuated more easily

than lower frequencies, piping structures

and the uids in them readily transmit

noise. Motors, bearings, and other rotating

components add to noise and sometimes

create objectionable harmonics.

Careful pump installation can contribute to

noise reduction. Proper alignment of the

pump and driver is essential.

Adequate supports for the inlet and

discharge piping is equally important.

A degree of noise reduction may be

obtained when the pumping unit is sup-

ported free of building structures by the

use of vibration isolators, exible piping

and conduit connections. Elastomer type

couplings are the best choice to separate

motor noises from the uid and piping

structure.

1D7 Freezing

When ambient temperatures drop below

the freezing point of the uid in a pump,

consideration should be given to heating,

insulating, or draining the pump. If you

choose draining the pump, and it will only

be for a short period, rst remove the

drain plugs and drain the lines to and from

the pump. Carefully blow out the pump

with compressed air to clear all internal

cavities of uid.

1E Recommended Spare Parts

FOR CRITICAL SERVICES - a duplex in-

stallation, with two identical pumping units

Ps- Pvp

sp. gr.

in parallel, is the safest and many times

the most cost effective choice.

FOR IMPORTANT SERVICES - a stand-

by pump, ready for installation is advised.

Special pricing and new pump warranty is

offered for factory rebuilding. Turn around

time can be as short as one or two days

for standard models.

FOR ROUTINE MAINTENANCE - only

the mechanical seals and a complete set

of “O” ring gaskets are recommended.

Should additional components show

wear, they are available from stock at the

factory.

FOR SERVICING A PUMP THAT DOES

NOT PRODUCE RATED HEAD - me-

chanical seals, “O” ring gaskets, impeller,

motor bracket, and cover.

FOR REBUILDING A PUMP - all the

components required for servicing plus

bearings, shaft, and drive keys for exible

coupled pumps, should be obtained.

(A factory rebuild should be considered

whenever your disassembly indicates

rebuilding is necessary as this is usually

more economical.)

The factory recommendation for spare

parts are all of those needed for rebuilding

a pump and are shown on the exploded

view drawings for each individual type of

pump.

T31 SERIES

Installation

CLOSE COUPLED PUMPS

FLEXIBLE COUPLED PUMPS

A. Location

B. Foundation

C. Leveling

D. Alignment

E. Piping

In order to insure that pumping equip-

ment is installed properly and to obtain

reliable pump operation, it is recom-

mended that only experienced, qualied

erecting engineers undertake this task.

Read the instructions thoroughly before

beginning.

2A Location

The rst consideration for locating a

pump is elevation. The lowest possible

elevation using the shortest possible

suction piping is usually the best. Ques-

tions regarding possible locations should

be resolved by making inlet head calcu-

lations including all friction losses. The

one producing the highest inlet pressure

should be selected. One reason for this

precaution is that, the greater the inlet

pressure, the less likelihood of NPSH

problems. Also a ooded suction is

particularly helpful on start-up when the

seals or the entire pump can be ruined

because it is not properly primed and

purged of air.

A dry, easily accessible location is

also important. Allow ample clearance

around the unit for free air circulation. If

a dry location is not available, the pump

can be mounted on a foundation, above

the oor. Specify motor enclosure, pump

materials, or coatings to suit the worst

conditions expected. Place the pump

so that it can be easily inspected and

serviced during operation. Sufcient

head room should be provided, particu-

larly when lifting devices will be used for

heavier assemblies.

2B Foundation

Baseplates alone are not rigid enough

to maintain alignment of the unit. The

pump foundation is used as a support

for the baseplate to maintain align-

ment of the unit. If the baseplate is to

be grouted to the foundation, it is only

necessary to embed the edges. It is

unnecessary to completely ll under the

baseplate. DO NOT grout the unit to

the foundation until it has been properly

aligned.

The foundation must be a permanent

rigid installation of concrete or other

material of sufcient mass to absorb all

normal vibrations. Locate the founda-

tion bolts using a layout or template in

relation to the suction and discharge

piping. If concrete is being used,

foundation bolts of the specied size

can be enclosed in a pipe sleeve two

to three diameters larger than the bolts

to compensate for minor variations in

alignment.

Close coupled pumps can be mount-

ed on a steel base prior to installation

or mounted directly to the foundation.

Place shims under one or more of the

motor feet so that strain and distortion

will not result when the mounting bolts

are tightened.

2C Leveling (Flexible Coupled Pumps

Only)

If the unit is received with the pump and

motor mounted on the baseplate:

1. Place the unit in position.

2. Disconnect the coupling halves. Do

not reconnect until all alignment

procedures have been completed.

Page 504

3. If the maximum offset exceeds .the

Parallel dimension .015 inches, loos-

en the motor or pump and place thin

metal shims under the motor or pump

feet until the offset is set properly.

4. Torque down the motor or pump.

5. Recheck alignment.

The angular alignment dimension needs

to be 0.070 or less.

1. Using a micrometer or caliper, measure

from the outside of one ange to the

outside of the other at intervals around

the periphery of the coupling. DO NOT

rotate the coupling

2. Determine the maximum (B) and

minimum (C) dimensions. Refer to

Figure 2-4.

Figure 2-1

Figure 2-2

3. Support the baseplates on metal

shims or wedges having a small

taper. (Refer to Figure 2-2)

a. Place shims close to the founda-

tion bolts. (Refer to Figure 2-2)

Figure 2-3

4. Torque down the motor or pump.

5. Recheck the parallel alignment

above.

If the parallel (.015 inches) or angular

(.070 inches) misalignment is great, this

is an indication of baseplate distortion

and must be corrected rst, refer to 2C

Leveling.

After all leveling and alignment opera-

tions have been completed, piping can

begin. After the piping has been com-

pleted, refer to 2E1 Piping Alignment.

Alignment of the unit must be checked

again to make certain that no piping

strains are causing distortion. After

approximately two weeks of operation,

check the alignment again to make

sure that temperature changes, piping

strain, or foundation variations have not

caused misalignment. If alignment has

been maintained over this period, the

pump and motor can be doweled to the

baseplate.

2E Piping

2E1 Piping Alignment

It is important that all piping be lined up

and not forced into place. It is recom-

mended that you begin piping at the

pump. If the lines are ended at the

pump, particularly if the last piece is cut

a little too short or long, the pump will

be forced to meet the pipe and strain or

distortion will result.

2E2 Piping Support

Never allow the pump to support piping.

Other means such as pipe hangers

and pipe supports should be used to

carry piping to avoid misalignment and

distortion. Consideration should be

given to thermally induced expansion

and contraction, particularly in long runs

of straight pipe.

Fasten Unit Securely to Foundation

Level Position

Gate Valve

Check Valve

Eccentric

Reducer

Increaser

Vent Plug /Drain Pipe

Supports

Union

Union and Spool

Piece

Combination

Foot Valve and

Strainer

Area of Foot Valve 1 1/2

Times Pipe Area

Area of strainer 3 to 4

Times Pipe Area

Pipe Hangers

Suction Reservior

Long Suction Lines to have Continual Rise

From Source. Eliminate High Spots

Elbow 10 to 20 Pipe

Diameters from Pump

Suction

Arrangement of Suction Piping for

Head-on Suction

Figure 2-5

Figure 2-4

Outlet

Rotation

Inlet

b. Place shims close to where the

greatest weight is located.

4. Check the baseplate for distortion:

a. Place a straightedge along the

baseplate to determine if it is dis-

torted.

b. Adjust the shims until the

baseplate is not distorted.

5. Use a section of the pipe to de-

termine if the inlet and discharge

openings are vertical and located

properly.

6. Correct the positions, if necessary, by

adjusting the shims.

2D Alignment

Although exible coupled pumps are

carefully aligned prior to crating and

shipping, it is almost a certainty that

strains imposed during transit have

altered the alignment. Complete the

following steps after the unit has been

placed on the foundation and leveled.

The standard coupling supplied by

MTH Pumps has an elastomer member

between two internal serrated anges.

They have smooth outsides of equal

diameter. These surfaces are used for

alignment procedures.

To check the PARALLEL alignment:

(Refer to Figure 2-3)

1. Place a straightedge across the two

coupling anges.

2. Measure the maximum offset (A),

Figure 2-3, at various points around

the periphery of the coupling. DO

NOT rotate the coupling.

3. If the difference between the

maximum and minimum exceeds the

Angular dimension (0.070 inches),

loosen the motor or pump and place

thin metal shims under the motor or

pump feet until the angular alignment

is correct.

Page 505

T31 SERIES

Operation

CLOSE COUPLED PUMPS

FLEXIBLE COUPLED PUMPS

A. Rotation

B. Inlet and Outlet Locatrions

C. Foreign Material

D. Electrical

E. Adjustments

F. Cooling Water

G. Priming

H. Starting

I. Stopping

3A Rotation

The standard direction of rotation of the

pump is right handed, or clockwise when

looking at the motor end of the pump.

A rotation arrow, refer to Figure 3-1,

is located on the pump to indicate the

correct direction of rotation.

Operating the pump in reverse will

cause substantial performance varia-

tions and can damage the pump.

Always conrm correct motor rotation

prior to connection of the coupling. If this

is not possible, or a nal rotation check

is being performed:

1. Jog the motor briey.

2. Observe rotation as the unit comes to

a stop.

3. Rotation should be in the direction of

the arrow.

If the motor operates in the wrong direc-

tion:

1. Interchange any two leads on a three

phase motor.

2. On a single phase motor,

change the leads as indicated on the

connection box cover. Some single

phase motors may not be reversible.

3B Inlet and Outlet Locations (Refer

to Figure 3-1)

The pump inlet is located on the end

farthest from the motor. The discharge

or “outlet” can be on the top, side, or

bottom depending on the model and

construction of the pump. Normal dis-

charge position is on top.

3C Foreign Material

All regenerative turbine pumps have

close running clearances in order to

maintain efciency. Take extra precau-

tions to insure that no foreign material

larger than 25 microns or .001 inches is

allowed to pass through the pump. Even

particles of this size can damage the

pump if allowed to continue. Regenera-

tive turbine pumps are not designed for

slurries.

Large particles, weld spatter, and other

material found in new

piping systems will bend the impeller

vanes and can sometimes lock up the

pump. If a new pump does not operate

properly, the rst thing to check for is

damage from foreign material.

3D Electrical

It is important to be aware of and follow

the appropriate local and national

electrical codes. Do not make wiring

alterations that can affect motor rotation

without reconrming correct rotation.

Select starter heaters and wiring for the

maximum current the motor can use at

full service factor loads. Regenerative

turbine pumps will typically use extra

power for a period until they run in. This

can take three to four weeks depending

on the duty cycle. During this period,

impellers are nding their hydraulically

balanced position.

3E Adjustments

No adjustments are required or advis-

able on new pumps. Because of the

close ts in regenerative turbine pumps,

it is not uncommon for the pump to be

difcult to turn over by hand after they

have been allowed to dry out inside.

New pumps from the factory are tested

using rust inhibitors to preclude this

possibility. On site system ushing may

remove these inhibitors and subject

the pump to the risk of lock up, if it is

allowed to dry out. In this case, do the

following:

1. Fill the pump with uid.

2. Loosen the thrubolts exactly one turn.

3. Jog the pump momentarily

using the on/off buttons if so

equipped.

4. This should “break” the impeller loose

without damage, unless foreign mate-

rial has entered the pump.

5. If possible, spin the pump (or operate

with minimal or zero discharge

pressure) while the thrubolts are

retightened exactly one turn.

This will ush residue from the close

tting impeller surfaces.

Because of the large areas of close

tting surfaces inside these pumps,

it takes only microscopic residue to

produce resistance to rotation. Once

loosened, this material is quickly dis-

persed and the impellers will nd their

hydraulic center. If these procedures

have been followed, no damage will

have resulted from "breaking loose" the

impeller.

3F Cooling Water

When the pump is used to pump hot

uids, consideration should be given

to cooling the seals and/or selecting

materials that will give satisfactory seal

life. The actual temperature at the seal

faces, the most critical area, will always

exceed the surrounding uid tempera-

ture. If seal ushing lines have not been

installed, heat can build up in the seal

faces to a degree that may destroy the

uid lm necessary to prevent rapid

wear. In some cases it is necessary to

cool the seal ushing uid. Refer to the

seal manufacturers charts for guidance

or to selection data in the MTH catalog

anytime uids can reach or exceed their

boiling point.

3G Priming

Pumps should not be operated

unless they are completely lled with

liquid. Damage to parts of the pump that

depend on liquid for their lubrication can

occur. Impellers can seize quickly when

a pump is run dry. Without lubrication,

seal faces can be damaged from heat

buildup.

Pumps can be easily primed with a

vacuum pump. An ejector or liquid ring

vacuum pump is recommended for this

purpose because they are not damaged

if liquid enters them.

2E3 Piping Size

In general, inlet and outlet pipe sizes

should be equal to or larger than those

of the pump.

This should not, however, be the de-

termining factor. Many things including

installation and operating costs are

involved in the decision. Careful use of

the pipe and tting friction loss tables

as shown in the Hydraulic Institute

manual along with the appropriate pump

performance curve should be the basis

for judgments.

2F Typical Installation (Refer to Fig-

ure 2-5)

Figure 2-5 shows a typical pump instal-

lation, note the use of pipe hangers

and support and the position of piping,

valves, and components.

Figure 3-1

Outlet

Rotation

Inlet

Page 506

Connect the vacuum line to the dis-

charge side of the pump, either in the

discharge opening or the drain tap. A

foot valve is not necessary when this

kind of device is used.

When a vacuum pump is not practical,

a foot valve in the suction inlet can be

used to prevent liquid from running out.

The pump and suction line can then be

lled completely from an outside source.

A vent opening will be necessary during

lling to let air escape. A tight foot valve

will keep the pump constantly primed so

that automatic operation is possible. The

valve should be inspected regularly to

see that it does not develop leaks which

would allow the pump to run dry.

Optional self-priming casings are avail-

able for MTH pumps allowing priming

when a vacuum pump or foot valve is

not practical. Refer to specic literature

for details.

There are four components to the self

primer:

1. A check valve - necessary to main-

tain a vacuum in the suction line as

surging occurs in the pump.

2. An air eliminator - used on the dis-

charge side of the pump to separate

air from liquid so the liquid can be

used again as air is carried through

the pump.

3. A recirculating line - carries liquid

from the air eliminator to the suction.

4. A uid chamber - used on the inlet

side to provide a supply of uid to

speed up priming.

Small suction lines are desirable to

minimize priming time.

Using the self priming casing, it is only

necessary to:

1. Open the plugs in both the inlet and

discharge chambers.

2. Pour uid in one until both are full.

3. Tighten both plugs.

4. Turn on the pump.

Priming time depends on lift, volume of

air in the suction line, and the size of

the regenerative turbine pump used. If

priming time is long and the pump be-

comes warm, rell the priming chambers

with fresh liquid. Most turbine pumps will

pump twenty-six to twenty-eight inches

of mercury vacuum with cold water in

the pump, but have very little capacity

and therefore are not practical at lifts

over twenty-two feet.

The best way to prime a pump and keep

it primed is to use a ooded suction.

While this is not always practical, it does

provide a number of advantages. The

likelihood of pump damage from dry run-

ning is eliminated. Suction lines may be

large, reducing line losses and minimiz-

ing the potential of cavitation damage.

There are no check valves or priming

devices to fail or require maintenance.

Whenever possible, design pumping

systems with ooded suction.

3H Starting

Before starting a pump for the rst time,

be sure that all the preceding operations

have been carried out. Proper rotation,

priming, and a free turning pump are

most important.

1. Start the pump with the minimum

possible line restriction.

2. Open discharge valves before press-

ing the starter.

3. Start the pump and let the system

clear of air.

4. Listen for foreign material being car-

ried through the pump.

5. Slowly close necessary valves or oth-

erwise place the pump into service.

6. Listen for indications of undue load or

other sounds indicating problems.

7. Use a clip-on ammeter to check for

a steady load after approximately

fteen minutes of operation.

3I Stopping

It is best to stop the pump with the

least discharge head possible both for

minimizing strain on components and to

be in low power mode in anticipation of

T31 SERIES

4. Maintenance

CLOSE COUPLED PUMPS

A. Seals

B. Cooling Water

C. Lubrication

4A Seals

Mechanical seals are used in MTH

Pumps to eliminate the maintenance

that is normally associated with packing

boxes. This does not, however, mean

they can totally be ignored. Check a new

installation for seal leakage.

Maintenance of seals consists primarily

of periodic observation, looking for the

rst signs of failure. An occasional drip

that continues to worsen is an indica-

tion that the seal has failed and must be

replaced. Follow the appropriate disas-

sembly/assembly instructions. Always

shut down a pump with failed seals

as soon as possible. Leaky seals are

usually followed by bearing failures and

then possible pump damage as rotating

parts become mis-aligned.

4B Cooling Water

If a heat exchanger is used to supply

cooling water for the seals, check the

Figure 4-2 Standard Seal Consrtuction

Figure 4-1

Seat

"O" Ring

Washer

Fexible

Diaphragm

Retainer

Drive Ring

Spring

Holder

restarting. If the pump will be down for

more than a few weeks it is advisable to

drain it. Follow the instructions for long

term storage, Section 1, 1B Storage.

After any prolonged stoppage, turn the

pump over by hand before restarting, to

be sure it is free.

Page 507

T31 SERIES

PUMP ENDS

A. Preliminary

B. Disassembly

C. Inspection of Components

D. Reassembly

E. Testing and Final Adjustments

5A Preliminary

Before attempting any service on the

pump or motor, disconnect the electrical

power to the pump motor. If the pump

and motor are to be removed as a

unit, note the wiring conguration. Use

colored or numbered tape to mark the

wire connections of the motor and power

source, for reconnection. If the pump is

being used to pump hot liquid, let the

pump and liquid cool before starting

disassembly.

1. Disconnect the inlet and outlet piping

before unbolting the pump and

motor. If the pipes are corroded, use

penetrating oil on the threads to aid

in removal.

2. Unbolt the motor from the base and

remove the unit. All work on the unit

should be performed on an elevated

workbench whenever possible.

5B Disassembly

The following tools and equipment are

needed for disassembly of T31 Series

Pumps:

1. Soft plastic or wooden mallet.

2. Small ball peen hammer.

3. 10mm wrench or socket

4. Snap ring pliers.

5. Penetrating oil.

6. 11/16" wood dowel (Approx. 6" long.)

7. Thin blade screwdriver.

8. Cealube G or similar glycol base

lubricant. (DO NOT use petroleum

products.)

To disassemble the pump:

Refer to Figure 5-2 for reference to

the numbered parts in the procedures

below.

1. Remove all liquid from the pump. Air

blown through the pump will remove

the water quickly.

2. Remove the four (4) M6-1 X 80mm

bolts (#19) from the cover (#2).

3. Remove the cover. In some cases

light tapping with a plastic or wooden

mallet on the outside diameter of the

cover may be required to loosen it

from the motor bracket. Care should

be taken if a screwdriver is needed

to pry between the cover and motor

bracket. Damage to the “O” ring (#7)

and/or impeller (#11) can result.

4. Remove the impeller. This is easily

done by setting the motor on end.

The impeller is a slip t and under

normal conditions, can be removed

by hand or by gently tapping on the

end of the shaft with a mallet. Striking

the shaft too hard could damage the

seat, rotating element, or the motor.

After removing the impeller, the im-

peller key (#23) needs to be removed

from the shaft keyway.

5. Remove the snap ring (#4) from the

shaft; note the spring that is held in

place by the snap ring. Remove the

spring from the shaft.

6. To remove the rotating element

(#12), gently slide the motor bracket

(#1) forward on the shaft to move

the rotating element high enough to

be removed by hand. Using tools on

the rotating element may damage

the rotating element or the seat.

Take precautions to keep the rotating

element clean if it is to be reused.

7. Next remove the motor bracket.

8. To remove the seat (#125). Refer to

Figure 5-1. Place the motor bracket

face down on a clean at surface.

Look into the opening in the center of

the motor bracket, and you will see a

portion of the seat. Insert the 11/16"

dowel and, very gently, tap the seat

until it drops out. Care must be taken

with the seat. It is often a brittle

material and is prone to breakage.

It is recommended that a new re-

placement seat be installed during

reassembly.

5C Inspection of Components

Thoroughly clean all parts. All compo-

nents should be examined for wear and

corrosion. Replace any parts that show

visible wear. If the pump was not pro-

ducing sufcient pressure or capacity,

the clearances between the rings and

impeller probably exceed the maximum

allowable clearance. At minimum the

impeller should be replaced in this case.

If the total side running clearance for

an impeller exceeds .007", it is unlikely

that pump performance will reach that of

a new pump except at lower discharge

pressures.

The “O” rings and other elastomeric

components should be replaced if they

have been deformed or cut.

If seal components must be reused,

carefully inspect for microscopic cracks

and nicks. Scratches that might be

ignored elsewhere can produce leakage

if they are on seal carbons and seat

wearing surfaces.

Cleanliness is imperative when working

with mechanical seals. Almost unnotice-

able particles between seal faces can

be, and often are, the cause of early

seal failures.

Check the impeller; it is designed to

oat. It should move easily on the shaft.

As long as it can be moved on the shaft

by hand, it is loose enough. If the impel-

ler can be rocked or wobbled, it is too

loose and must be replaced.

Check the shaft for galling, pitting, and

corrosion. If the shaft is corroded where

the seal comes in contact with the shaft,

Service

Figure 5-1

system periodically in the same way

as 4B. As an additional system check,

measure the temperature as it leaves

the heat exchanger. This can be done

with an external contact thermometer

or by adding an appropriate tting and

internal thermometer. Cooling water

should be kept below 200°F. External

cooling water sources should be

checked for temperature and pressure.

Line pressure at the seal chamber tting

must exceed that in the seal chamber

by at least 5 psi. Refer to the specic

instruction sheets for further cooling

system information.

4C Lubrication

Sealed ball bearings are standard in all

MTH pumps. The maximum continuous

operating temperature for bearings

is 250°F. While it is not advisable to

routinely disassemble sealed bearings,

it is possible to removes the seals

during disassembly and determine

their condition. Use new bearings

for reassembly. While the pump is in

service, listen for unusual sounds or

changes in bearing noise. A screwdriver

held between the bearing housing and

your ear while the pump is rotated by

hand is sometimes helpful if there is too

much ambient noise when the system is

operating.

Page 508

the motor or bearing pedestal shaft

must be replaced. Surface corrosion

must be removed so that seals can

slide freely during assembly. The shaft

diameter should be no smaller than

.002" below the nominal fractional seal

sizes. Remove any nicks or burrs which

may have occurred during disassembly.

Re-clean parts as necessary.

5D Reassembly

All parts should be visually inspected

and cleaned or replaced as outlined in

5C above.

1. The seal seat (#125) must be

installed in the motor bracket (#1)

before the bracket is installed on the

motor. To install the seat:

a. Place the motor bracket face up

on a at surface.

b. Apply a coating of compatible

lubricant to the elastomer portion

of the seat to aid with installation.

c. Carefully press the seat, smooth

side up, into the seat cavity of the

motor bracket. Thumb pressure

is usually sufcient to install the

seat.

2. Install the motor bracket. This is best

done with the motor standing on end.

Make sure that both the "C"-face of

the motor and the feet of the motor

bracket are clean. Slide the motor

bracket over the shaft onto the motor.

3. Install the rotating element (#12).

Lubricate I.D. of the rotating element.

Place the rotating element on the

shaft with the carbon end towards the

seat. Place the spring over the shaft,

with the backing plate up and com-

press the spring to locate the rotating

element against the seat. If this fails

to seat the rotating element gently

push the rotating element down with

a thin blade screwdriver being careful

not to damage the seat or the rotating

element.

4. Compress and hold the seal spring

slightly below the snap ring groove

and install the snap ring (#4). Make

sure the snap ring is locked in the

groove.

5. Install the impeller key (#23) into the

shaft keyway.

6. The impeller is a slip t and should

slide on rmly but easily until it stops

against the impeller wearing surface.

Force should not be required or used

to install the impeller in the correct

position. The impeller hub should

be facing out away from the motor

bracket. Refer to Figure 5-2.

7. Next, rotate the impeller by hand, the

impeller should move freely.

8. Place the large “O” ring (#7) into the

outside “O” ring groove in the motor

bracket. Place the two (2) smaller "O"

rings (#8) into the smaller "O" ring

grooves.

9. Place the cover (#2) over the motor

bracket and install the four (4) M6-1

X 80mm bolts (#19). Tighten the bolts

systematically, alternating diagonally

across the cover. DO NOT exceed

7-11 ft. lbs. of torque or damage to

the motor "C"-face may occur.

5E Testing and Final Adjustment

The pump is now ready for installation.

Final adjustments will be made with the

pump in operation.

1. Connect all piping and ll the pump

with uid.

2. Reconnect the electrical connections,

referring to the colored or numbered

tape used to mark the wires.

3. Make sure all valves are opened, and

uid will ow through the system.

4. Start the pump and make the nal

adjustments to the M6 bolts holding

the cover on. These nuts and bolts

must be torqued to about 7-11 ft.

lbs. to obtain proper performance.

5. Check for leaks on pump and piping.

Special attention should be given to

the seal area at the rear opening in

the motor bracket.

6. Under pressure, the impeller will nd

its “hydraulic” balance.

7. Using an amprobe or similar device,

check for motor overload.

8. While the impeller is seating, it is

common to experience some vari-

ance in readings. After a run-in period

the readings should level off.

This completes the adjustment and

testing phase. The pump is ready for

service.

BEARING PEDESTALS

A. Preliminary

B. Disassembly

C. Inspection of Components

D. Reassembly

E. Testing and Final Adjustments

5A Preliminary P2

1. Disconnect the inlet and outlet piping

before unbolting the pump. If the

pipes are corroded, use penetrating

oil on the threads to aid in removal.

2. Unbolt the pump from the base and

remove. Disassembly instructions for

the pump are found in Section 5, T31

PUMP ENDS. All work on the unit

should be performed on an elevated

workbench whenever possible.

The disassembly and reassembly

procedures are broken into two sections

covering the following units :

Figure 5-2

125

411 23

T31 CLOSE COUPLED PUMP

NAME/DESCRIPTION PART NO. QTY.

Motor Bracket 1 1

Cover 2 1

"O" Ring/Casing 7 1

"O" Ring/Drain Plug 7A 1

"O" Ring/Thru Bolt 8 2

Snap Ring 4 1

Impeller 11 1

Seal Rotating Element 12 1

Seal Stationary Seat 125 1

Thru Bolt 19 4

Pipe Plug 22 1

Key/Impeller Drive 23 1

Page 509

5B — Disassembly of the P2 Unit.

5D — Reassembly of the P2 Unit.

An exploded view of the unit, Figure 5-3

is provided for referencing the numbers

in the following procedures, i.e. inger

(#21).

5B Disassembly

The following tools and equipment are

needed for disassembly of the P2 unit:

Tools:

1. Soft plastic or wooden mallet.

2. Arbor press or vise.

3. 3/4" X 6" piece of water pipe.

4. Internal snap ring plier.

5. Penetrating oil.

When installing or removing bearings

from the shaft, the use of an arbor

press is strongly recommended.

To disassemble the pedestal:

Refer to Figure 5-3 for reference to the

numbered parts in the procedures.

1. Remove the inger (#21) located in

the pump end of the bearing pedestal

(#3).

supported during this operation, no

damage will be done to the bearings.

3. Repeat step 2 to remove the other

bearing. Good support used on the

inner races will prevent bearing

damage.

5C Inspection of Components

Thoroughly clean all parts. All compo-

nents should be examined for wear and

corrosion. Replace any parts showing

visible wear.

Check to be certain that a press t

still exists between the shaft and the

bearings. New bearings, or at least

cleaned and re-greased bearings, are

recommended.

Check the shaft for galling, pitting,

and corrosion. Surface corrosion on

the pump portion of the shaft must be

removed so the seals will slide freely

during assembly. The shaft diameter

24A

P2 BEARING PEDESTAL

Figure 5-3

NAME/DESCRIPTION PART NO. QTY.

Bearing Pedestal 3 1

Snap Ring/

Bearing Retaining 4 1

Shaft 17 1

Flinger 21 1

Key Coupling 23 1

Ball Bearing/Inboard 24 1

Ball Bearing/Outboard 24A 1

Coupling Guard/Halves 30 2

Capscrew 33 4

Figure 5-4

should be no smaller than .002" below

the nominal fractional seal sizes.

Remove any nicks or burrs which may

have occurred during disassembly. Re-

clean parts as necessary.

5D Reassembly

All parts should be visually inspected

and cleaned or replaced as outlined

in 5C above. It is recommended that

the bearings be replaced anytime the

bearing pedestal is disassembled for

service.

1. Using an arbor press, install the

bearings on the shaft prior to install-

ing the shaft into the pedestal. A

steel “donut” with the proper inside

diameter and outside diameter,

Refer to Chart 1, should be used

between the arbor face plate and

the lower bearing to insure proper

installation and to prevent bearing

damage. The bearings must seat

against the shoulder for proper

alignment. Refer to Figure 5-7. *Also

refer to Alternate bearing installation

procedures.

2. Using a snap ring plier, remove snap

ring (#4).

3. Open the jaws of the vice approxi-

mately 2-1/4".

4. Place the pedestal, pump side down,

on the jaws. Refer to Figure 5-4.

5. Using a plastic or wooden

mallet, gently tap on the end of the

shaft until it slides out of the frame.

Both bearings should come out with

the shaft. Do not use a metal ham-

mer, severe damage to the shaft will

occur.

6. Using the arbor press, remove the

two (2) bearings from the shaft. Refer

to Figure 5-5. If the inner race is well

Figure 5-5

If an arbor press is not available, a

bench vise may be substituted using

the following instructions.

1. Remove the pedestal and

close the jaws to approximately

1-1/8".

2. Place the shaft with either

bearing resting on top of the jaws

and gently tap on the end of the

shaft until the bearing is removed.

Refer to Figure 5-6.

Figure 5-6

Figure 5-7

CHART 1 P2

Inside Diameter 1"

Outside Diameter 2"

2. Place the pedestal, pump mounting

surface up, in a vise or suitable

xture and insert the bearing assem-

bly. It should be possible to install

the shaft assembly with rm thumb

pressure. Refer to Figure 5-8. If

more force is required, the butt end

of a hammer handle or plastic mallet

may be helpful. The shaft assembly

should never be forced or driven in.

Page 510

3. Install the snap ring (#4) in

the pump end of the pedestal. Be

sure the snap ring is seated properly

in the groove. The beveled edge of

the ring should face away from the

bearing.

4. Install the inger over the snap ring.

The bearing pedestal is now ready

for pump and motor installation.

*Alternate bearing installation proce-

dures.

If an arbor press is not available, the

bearings may be installed on the shaft

using the following procedure:

This procedure is not recommended and

should only be used in an emergency

situation.

Figure 5-8

1. Stand a piece of 3/4" pipe,

with the threads cut off, on a work-

bench or similar at surface, with the

bearing placed on the correct shaft

end.

2. Insert the shaft into the pipe so the

bearing is between the pipe and the

shoulder of the shaft. Refer to Figure

5-9.

3. Using extreme caution, gently tap on

the end of the shaft until the bearing

rests against the shoulder. Never

attempt to install the bearings by

striking the outer race.

4. Repeat step 3 for the other bearing.

Figure 5-9

T31 SERIES

Troubleshooting

leads on a three phase motor to

change rotation. Check motor name-

plate for single phase operation.

6. Clogged suction line, strainer, or foot

valve —

Inspect and clean out if necessary.

7. Air pocket in suction line —

Look for high spots in inlet piping

system. Evacuate the system with a

vacuum pump if necessary.

6B Reduced Capacity

1. Pump not up to speed —

Use a tachometer to determine actual

RPM. Check voltage and wiring con-

nections.

2. Excessive suction lift —

Relocate pump, supply tank, or both

to minimize suction lift.

3. Insufcient NPSH —

Relocate pump, supply tank, or

both to improve NPSH available if

possible. Increase suction pressure.

Reduce uid temperature. Select a

pump with lower NPSH requirements.

4. Mechanical damage —

Rotate the pump by hand to deter-

mine if there are tight spots. Broken

or bent impeller vanes can some-

times be noticed in this manner. If

there is suspicion of damage, remove

the pump from service and disassem-

ble for inspection.

5. Air leak in the suction line —

Fill the system with uid and hydro-

statically test. Tighten connections or

replace leaky components.

6. Air pockets in the suction piping —

Operating the system at maximum

ow conditions will usually clear the

lines. Evacuate the system with a

vacuum pump if necessary.

7. Suction lines, strainer, or foot valve

too small or clogged —

Inspect and clean out as necessary.

Fittings and lines should be at least

equal to the pump suction size.

8. Discharge head too high —

Install a pressure gauge at the pump

discharge to determine the actual

operating pressure. Compare read-

ings with pump performance curve. A

larger pump may be necessary.

9. Excessive wear —

If a pump had previously performed

satisfactorily and now gives evidence

of reduced performance, it should be

disassembled and examined for wear

after the simpler possible problems

have been pursued.

6C Reduced Pressure

1. Pump not up to speed —

Use a tachometer to determine actual

RPM. Check voltage and wiring con-

nections.

CLOSE COUPLED PUMPS

A. Failure to Pump

B. Reduced Capacity

C. Reduced Pressure

D. Pump Loses Prime After Starting

E. Excessive Power Consumption

F. Pump Vibrates or is Noisy

G. Mechanical Problems

H. Seal Leakage

6A Failure to Pump

1. Pump not up to speed —

Use tachometer to determine actual

RPM. Check voltage and wiring con-

nections.

2. Pump not primed —

Conrm that pump and all inlet piping

is lled with uid.

3. Discharge head too high —

Install a pressure gauge at the pump

discharge to determine the actual

operating pressure. Compare read-

ings with pump performance curve. A

larger pump may be necessary.

4. Excessive suction lift —

Relocate pump, supply tank, or both

to minimize suction lift.

5. Wrong direction of rotation—

Compare pump rotation with arrow

on pump. Standard pumps rotate in

a counterclockwise direction when

looking at the shaft extension end.

Clockwise from the motor end on

close coupled pumps. Reverse two

5E Testing and Final Adjustments

1. Check to be sure that the

rotating assembly turns freely. Turn

the shaft by hand. If it is tight or

rough spots are encountered, it is

likely that at least one of the bearings

was damaged during disassembly/

assembly operations and will have to

be replaced.

2. Look to make sure that the lip seals

on the bearings are positioned

properly in their grooves. Correct

if necessary. As the bearings are

turned, the grooves should

appear wet with oil but have no vis-

ible grease present.

3. Recheck the snap ring on

the large bearing end. It should be

rmly in place, and no axial motion

should result from gentle tapping

on either end of the shaft. (Use a

soft mallet so shaft surfaces are not

damaged.)

4. No adjustments are possible or

required. Proceed with the appropri-

ate pump end assembly operations.

Refer to Section 5 SERVICE - PUMP

ENDS (Final testing is done after

the pump end is in place.)

Page 511

2. Air or vapor in liquid —

Install a separator in the suction line.

Hydrostatically test the system to

insure that there are no leaks.

3. Mechanical wear or damage —

Rotate the pump by hand to deter-

mine if there are tight spots. Broken

or bent impeller vanes can some-

times be noticed in this manner.

If there is suspicion of damage or

wear, remove the pump from service

and disassemble for inspection.

Look for wear on the impeller, suc-

tion cover, and motor bracket.

4. System head less than expected —

Replace pump with higher capac-

ity unit or add a valve or orice to

increase line resistance.

6D Pump Loses Prime After Starting

1. Leak in suction line —

Fill the system with uid and hydro-

statically test. Tighten connections

or replace leaky components.

2. Air entering pump through

“O” rings —

Hydrostatically test the pump looking

for leaks. Replace faulty “O” rings.

3. Insufcient NPSH or too much

suction lift —

Relocate pump, supply tank, or both

to improve inlet conditions. Increase

suction pressure. Reduce uid tem-

perature. Select a pump with lower

NPSH requirements.

6E Excessive Power Consumption

1. Speed too high —

Check RPM with tachometer.

2. Discharge head too high —

Install a pressure gauge at the

discharge to determine the actual

operating pressure. Compare read-

ings with pump performance curve.

A different pump, motor or both may

be necessary.

3. Specic gravity or viscosity too high

—

Check uid involved. A different

motor may be necessary.

4. Mechanical damage —

Turn pump over by hand. After a few

days run in period, all models should

turn over by hand with no tight

spots. An exception to this is when

the pump has been idle for some

time. In this case, run the pump for

a few hours before checking for tight

spots. If there is suspicion of dam-

age, remove the pump from service

and disassemble for inspection.

5. Pump not fully broken in —

It is normal for new pumps to con-

sume higher than normal current

during the break-in period. If high

power consumption persists beyond

a few weeks, it is unlikely that further

operation will reduce consumption.

6. Pump not properly adjusted —

Loosen all nuts on pump exactly

one turn. Follow the instructions in

Section 5E Testing and Final Adjust-

ments for repositioning fasteners.

6F Pump Vibrates or Is Noisy

1. Insecure mounting —

Follow instructions in Section 2.

2. Piping load on pump —

Install piping supports and check

to see that there is no strain on the

pump.

3. Mechanical damage —

If mechanical damage is suspected,

check rst to determine if pump

turns freely. Disassemble for inspec-

tion if tight spots are found.

4. Pump has a high pitched whine —

This is typical of a regenerative

turbine pump. The intensity should

increase as pressure increases.

Over a period of a few weeks the

noise level will diminish and will be

noticeably quieter as it approaches a

run-in condition.

6G Mechanical Problems

1. Short bearing life —

Bearings damaged due to leaky

seals. Coupling misalignment. Piping

load on pump. RPM or pressure too

high.

2. Pump locked up —

Pump dried out and close clear-

ances rusty. Follow installation

instructions for loosening the pump.

Foreign material in pump. Flush

out. Disassemble if ushing is not

successful.

3. Pump leaks —

Seal or “O” rings are usually the

problem. Disassembly and replace-

ment is the solution if tightening the

through bolts has no effect.

6H Seal Leakage

1. Worn seat or rotating element —

Seals will last many years operating

on cold clear water or other uids

with reasonable lubricity. Particles,

even microscopic, increase normal

wear rates. Temperatures near the

uid's boiling point can reduce lu-

bricity which in turn increases wear.

Some chemicals will erode the seal

faces or plate out on the faces pro-

ducing an abrasive effect. Immediate

seal replacement is recommended

when leaks become evident, since

bearings are quickly ruined as a re-

sult of moisture. Severe mechanical

damage results when the bearings

fail.

2. Improperly installed seat or rotating

element —

If a seal has recently been replaced,

look for a missing “O” ring around

the seat, or a seat that is cocked or

in backwards. The smooth surface

should face the rotating element.

The rotating element may be in

backward or improperly positioned.

Refer to the appropriate seal dia-

grams and instructions to conrm

the correct seal orientation. Rotating

elements sometimes stick in the

wrong position if left partially as-

sembled for some time. Make sure

a rotating element can be moved

axially on the shaft before closing up

the pump and then make the nal

adjustments as soon as possible.

3. Seat broken during assembly—

Ceramic seats are particularly vul-

nerable to damage.

Carefully follow reassembly instruc-

tions for seals.

4. Pitted shaft under the seal —

Reusing a shaft when repairing a

pump is the probable cause of this

problem. The seal rotating element

can produce a pitted surface under-

neath its elastomer portion during

normal use. This is normally not a

problem for the rst seal assembly

since the elastomer is conforming as

this action occurs. A new seal can

leak before it conforms if the pits are

large enough. If any pits are visible

to the unaided eye, shaft replace-

ment is advised.

T31 SERIES

7. Parts and Repair Services

A. Parts

B. Repair Service

C. Warranty Service

D. Motors, Mechanical Seals,

and Accessories

7A Parts

Repair parts may be obtained through

your local Authorized MTH Pumps

Representative or Distributor who can

be found in the yellow pages or by con-

tacting MTH Pumps at 401 W. Main St.

Plano, IL 60545

Phone: 630-552-4115

Fax: 630-552-3688.

7B Repair Services

Repair service for an MTH pump should

be obtained from the company through

which it was purchased.

Section T31 Page 516

Dated July 2015

97-4621-01-588

8. Limited Warranty

In the event this is not possible, the

name and phone number of a nearby

MTH representative or distributor may

be obtained by contacting MTH Pumps.

In the event that it is necessary to return

the pump to the factory for repairs,

remove all accessories attached to the

pump. We cannot accept responsibility

for their safe removal, storage, and

return.

7C Warranty Service

All requests for warranty claims should

be made through the company from

which the pump was purchased or sup-

plied. Complete details on what is wrong

with the pump must be provided along

with information on the system in which

it is installed. Refer to the MTH Pumps

Limited Warranty statement. Return

authorization must be obtained prior to

returning any equipment.

7D Motors, Mechanical Seals, and

Accessories

Repair or replacement service on

motors, mechanical seals, relief valves,

or other accessories should be obtained

from the manufacturer of these compo-

nents. MTH does not carry replacement

parts and is not authorized to render

repair service on these components. Re-

placement mechanical seals are stocked

at MTH and are always available insofar

as possible for immediate shipment.

Warranty service, as well as expert

application information can be obtained

from your local seal manufacturer's

sales ofce.

T31 SERIES

MTH makes good faith recommendations of Products, based on its experience and the application information provided by the Purchaser. However, the responsibility for testing and approving a Product

to be used for a particular purpose lies with the Purchaser.

The obligations of MTH Tool Company, Inc. (hereinafter referred to as “MTH”), with respect to a “Product” (dened below) are limited as set forth herein.

ALL IMPLIED WARRANTIES, including the “implied warranty of merchantability” and the “implied warranty of tness for a particular purpose” are HEREBY DISCLAIMED.

There are no warranties which extend beyond the description on the face hereof.

MTH warrants that, during the “Warranty Period” (dened below), the “Product” (dened below) will not fail to meet the “Operational Specications” (dened below), within applicable industry tolerances

established by the Hydraulic Institute, due to defects in its materials and workmanship. MTH does not warrant that any Product will meet the “Operational Specications” in conditions other than the

Standard Operating Conditions, unless agreed to by MTH in a signed writing.

For all purposes of this Limited Warranty:

(a) The term “Warranty Period” shall mean the twelve (12) month period from the date of shipment from MTH to the Purchaser (the “Warranty Period”).

(b) The term “Product” shall mean: any item or assembly of items sold by MTH that are either manufactured or selected by MTH to meet the “Operational Specications”. The term

“Product” does not include any item, assembly of items, or portion of such assembly that is selected or specied by any entity other than MTH, or that MTH has identied as ineligible for

warranty coverage.

(c) The term "Purchaser" shall mean the original person(s) or entity that issued the purchase order to MTH, for the Product.

(d) The term “Operational Specications” shall mean the specied dimensions, material composition, and performance parameters of a Product, as published by MTH, or as otherwise

agreed in a signed writing between MTH and Purchaser. “Standard Operating Conditions”, for pumps, shall mean: operating with clean water, at standard temperature and pressure.

“Operational Specications” shall not include visual appearance or any other parameters not expressly agreed to in writing.

If, within the Warranty Period, a Purchaser believes that a Product has failed to meet its Operational Specications, the Purchaser must request a Return Goods Authorization (“RGA”) in the manner

specied at http://www.mthpumps.com, and supply any additional information MTH might reasonably request. If the Product was purchased through a distributor or any entity other than MTH, the RGA

request must be made through that entity. Any Product returned without an RGA will be refused at the dock. Products authorized for return must be properly packaged to prevent further damage, clearly

marked with the Return Goods Authorization “RGA” number provided by MTH, and shipped freight prepaid and allowed, F.O.B. the MTH factory at Plano, Illinois, USA.

MTH may, in its sole discretion, deny any warranty claim if shipping damage, any attempted disassembly, or any other action outside of MTH’s control impairs MTH’s determination of the existence of,

or cause of a claimed failure.

Notwithstanding anything to the contrary in this Limited Warranty, MTH shall have no obligation to repair or replace any Product it determines to have any defects arising from or attributable to: (1)

abrasion, corrosion, or erosion arising after shipment from MTH; (2) improper handling, packaging, installation, storage, or maintenance, after it is shipped by MTH; (3) repairs or alterations outside of

MTH’s factory, in any manner, without MTH’s written authorization; (4) misuse, negligence, or accident after shipment from MTH; (5) use in a manner inconsistent with MTH’s published instructions and

Operational Specications, or other written specications agreed to by both Purchaser and MTH; or (6) incorrect power supply or power quality. MTH’s determination with respect to the applicability of

this Limited Warranty to any particular defect or Product shall be nal and conclusive.

If, after examination by an authorized representative of MTH, MTH determines that the Product failed to meet the “Operational Specications”, within applicable industry tolerances established by the

Hydraulic Institute, due to defects in its materials and workmanship, during the Warranty Period, then MTH will, at its option, ship a repaired or replaced Product to the Purchaser, F.O.B. MTH’s factory in

Plano, Illinois, U.S.A., freight prepaid and allowed. MTH will use a freight provider of its choosing, via a method no faster than that used for shipping the Product to MTH. MTH may, at its sole discretion,

issue a credit memo to Purchaser for some or all Purchaser’s shipping costs to return a defective Product to MTH.

MTH accepts no responsibility for costs associated with removal and reinstallation of Products.

Under no circumstances shall MTH be liable for incidental or consequential damages.

MTH neither assumes responsibility for, nor authorizes any person to assume for it, any other obligation in connection with the sale of any Product or any enlargement of this Limited Warranty.

Some States do not allow the exclusion or limitation of incidental or consequential damages. So, the above limitations or exclusions might not apply to you. This warranty gives you

specic legal rights, and you might, also, have other rights, which vary from State to State.

By using this Product, you agree that this Limited Warranty is governed by the laws of the State of Illinois; that this Limited Warranty shall be interpreted and enforced only in accordance

with the laws of the State of Illinois (excluding its conicts of law provisions); and that you submit yourself to the jurisdiction of the 23rd Judicial Circuit, Kendall County, Illinois, which