WDM ME Series User manual

Operation Manual
Medium Pressure Pumps

Operation Manual.
2
1. Introduction.
Congratulations! You have purchased a product developed with the
latest technology from WDM Pumps, Inc. (referred to as “WDM”).
WDM designs and manufactures our products with the highest quality
components. Our experience as a manufacturer and our special care
and dedication in production result in products that meet the highest
standards.
The information contained in this manual is important for the
installation, operation and maintenance of your WDM ME pumps.
Read all instructions carefully before installing and using the product.
Keep this manual for future reference.
Our products are factory tested to ensure proper operation. Inspect
carefully and make sure there are no missing or damaged pieces
from shipping. If, upon delivery, parts are damaged or missing, make
a claim to the shipping company as soon as possible.
The design of this product,as well as the materials and processes
used in its manufacture provide for proper operation. However
product performance and lifespan depend on appropriate application,
installation, periodic inspection and general preventive maintenance.
This manual contains instructions for the installation and operation of
your ME pumps. Read these recommendations carefully before use.
Keep this manual for future reference.
WARNING.
WDM is not responsible for any damage or accidents that
occur when the instructions given in this manual have not been
followed. The warranty is only valid when using WDM original spare
parts. Failure to follow these guidelines in installing and starting your
pump will void your warranty.

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2. Safety Recommendations.
•WDM pumps are designed to operate safely when used and
maintained according to this manual.
•Rotating parts of the pumps are dangerous and can cause
injury. Operators and maintenance personnel should be
aware of and follow safety recommendations.
•The pumps are considered heavy equipment. Handle them
with care.
•Pumps should not pump hazardous material unless they have
been designed and designated to do so.
•The pipes and pump should never be forced to fit if using the
correct size. If you have to apply force, then get a different
size.
•To reduce the risk of electrical shock, all wiring of pumps,
motors, overload protection and control panels must be in
accordance with the National Electric Code (NEC) or the
Canadian Electrical Code (CEC) and all applicable state,
province, local codes and ordinances. Requirements will vary
depending on usage and location. Improper grounding will
void the warranty.
•To reduce the risk of electrical shock, always disconnect the
pump from the power source before handling or servicing.
Cable should be inspected frequently.
•Never handle connected power cords with wet hands.
•If any product is to be returned, it must be cleaned, sanitized,
or decontaminated as necessary according to any applicable
laws and regulations prior to shipment, to protect employees
from exposure to health hazards.
•Always wear eye protection when working on pumps.
•Loose fitting clothing can easily be caught by the impeller or
other moving parts, therefore do not wear loose fitting clothing
when doing maintenance or service work on the pump.
•Gloves should be worn whenever handling parts that have
sharp edges.
•Wear safety shoes when handling heavy parts or tools.
•For any maintenance always disconnect power.
•Never place hands in the suction or discharge openings.
•Safety handles should always be fastened securely before
attempting to lift the pump.

Operation Manual.
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•The pump should not be operated without the proper safety
devices in place. If such devices are removed during service
and repair work, make sure they are replaced before
operating the pump again.
•Do not operate the pump when holding the cable assembly.
•Blocking or restricting the discharge hose may cause it to
whip under the pressure.
•Do not remove the drain plugs or valves if the pump is
operating.
•The pump should be isolated from a pressurized system
before it is removed.
•Allow pumps time to cool sufficiently before handling or
servicing them as heat and pressure build up inside during
operation.
•Never apply heat in disassembling a pump as doing so could
cause an explosion.
•Do not exceed manufacturer’s recommendation for maximum
performance, as doing so could cause the motor to overheat.
•If the discharge valve is closed, do not continue operating the
pump. Doing so will decrease the life expectancy of the
bearings and mechanical seal. Also, the extreme heat from
doing so can cause steam to build up creating a dangerous
pressure situation. A temperature or pressure relief valve
should be installed on the pump body.
3. Installation.
Location.
•Place the pump as close to the suction source as
possible. Suction piping should be as short and direct as
possible.
•Place the pump below the water level whenever possible.
This will facilitate priming, ensures a constant flow of liquid,
and provides a positive suction.
•Make sure the NPSH (Net Positive Suction Head) is
accounted for at the suction end of pump relative to
the
whole system. Available NPSH must always exceed the
required NPSH specified in the yield curve specifications of
the pump.

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•Always allow sufficient access for maintenance and
inspection, plus space for the use of a crane strong enough to
lift the unit.
•Be sure to have an adequate power supply for the pump
motor.
The electrical characteristics should fall within the
range specified on the engine data plate.
•Protect the pump from exposure to extremely low
temperatures to prevent fluid inside the pump from freezing.
The foundation for a horizontal pump.
•To absorb vibrations and prevent misalignment, horizontal
pumps should be permanently installed on foundations of
sufficient size, that are made of concrete or steel.
•The foundation may either be on springs or on a raised
portion of the floor.
•Concrete foundations must be poured without interruption. All
foundations must be between 3/4 to
1-1/2 inches below the
elevation of the end pump.
•Anchor bolts should be in their designated positions along the
pipe sleeves, and be long enough to go through grout, flange,
nuts, and washers..
•As the foundation needs time to set, the pump should be
installed several days after the foundation is laid.
•Once the foundation (if concrete) is poured and set, the
pump’s base plate should be placed on loose fitting wedges
or shims located near each anchor bolt. Intervals between
the wedges or shims should be less than 24” per side.
•Wedges or shims should raise the bottom of the pump about
¾ - 1¼ inches in order for there to be room for slurry.
Wedges and shims should be adjusted to make the pump
level using a spirit level.
•Make sure that piping is aligned so as not to place stress on
either flange.
•Once the pump is aligned, putting on bolt nuts and tightening
them will be sufficient to anchor the pump to the steel or
concrete foundation.
•Once any grout is completely hardened, tighten the
foundation bolts as necessary. If tightening occurs then
recheck pump alignment.

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Suction (inlet) piping.
Suction piping must be selected and installed in such a way to
minimize pressure loss and allow for a sufficient liquid flow during the
starting and operation of the pump.
Many NPSH problems can be traced directly to improper sizing of
suction piping systems.
The following precautions should be noted when installing suction
piping:
•Suction piping should be as direct as possible, and ideally
the length should be at least ten times the pipe diameter.
•Short suction piping can be the same diameter as the
suction opening.
•Depending on the length of a longer pipe, the diameter should
be one or two sizes larger than the pump suction.Reduce the
diameter of the pipe to match the diameter of the pump
suction as it reaches pump suction opening.
•When required to reduce the pipe diameter, use an eccentric
reducer with the eccentric side down.
•The pipe should never be smaller in diameter than the pump
suction opening.
Steel base plate
Shims
.25”
.75” to 1.5”
Grout

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•For best results all horizontal suction lines should follow an
even gradient. In suction lift conditions the gradient should be
a gradual slope upward. For positive suction head, the
gradient should be a gradual downward slope.
•In order to avoid air pockets that can throttle the system or
cause erratic pumping, high points, such a pipe loops, should
be avoided.
•In order to shut down the pump for maintenance or removal,
a valve should be installed in the suction line. If more than
one pump is on the same suction line, multiple values should
be placed in the line in order to shut down each pump
individually.
•Gate valves should always be installed in positions that
avoid air pockets. Globe valves should not be used.
•Valves along the suction line should always be fully open
when the pump is in operation..
•Pressure gauges may be installed in gauge taps on pump
nozzles (suction and discharge) if they are the correct size.
These gauges will monitor the pump’s performance,
helping to determine if the performance of the pump
lies within the parameters of the performance curve. When
unstable operation conditions occur, these pressure
gauges will indicate the wide fluctuation in pressure.

Operation Manual.
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Negative suction installation Diagram
Piping Support
Foot Valve & Strainer
Eccentric
Reducer
Concentric
Reducer
Shut-off
Valve
Check
Valve
Elbow
Expansion
Joint

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Positive Suction installation Diagram
Discharge (outlet) piping.
•Discharge line should be at least the same diameter as
discharge opening for short piping, for longer piping size
should be 1 or 2 sizes larger according to piping length.
•For best results horizontal piping should have an even
gradient.
1. Y fitting
2. Tank
3. Shut-off Valve
4. Elbow
5. Expansion Joint
6. Shut-off Valve
7. Check Valve
8. Concentric Reduction
9. Eccentric Reduction
10.
Support
4
3
2
1
10
9
8
7
6
5

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•Trap air in high points of discharge line can affect the pump
operation.
•Avoid hydraulic shock by closing the valve near the discharge
before the pump shutdown.
•The discharge pipe should be as short as possible and fitted
with either a check or gate valve for each pump that uses the
same line. This valve is used to prevent backflow into the
pump which can cause excessive flooding and damage to the
pump. The valve may also be used to stop flow into the pump
to help with priming and starting, shutdown, maintenance,
and pump removal.
Electrical connections.
Power and Cables Control: The cable assembly mounted to the
pump should not be modified in any way except for shortening to a
specific application. Any splice between the pump and the control
panel must be in accordance with all applicable electrical standards.
Do not leave the electrical wire exposed, as it may reach the motor
and cause serious damage.
The black, white, and red wires are all energy carriers or conductors.
The green wire is the grounding wire.
ATTENTION.
Always use the installed handle, never the cord, to lift the
pump,
ATTENTION.
WDM does not supply all the accessories (valves,
gauges, pipes, extensions, etc.) mentioned in this operation
manual and installation.

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All pumps on ME line of WDM Pumps are equipped with mechanical
seals matched to the specific conditions for which the pump was
sold.
To avoid damage to the seal, and to maximize seal life observe the
following precautions:
•Stay within the temperature or pressure limitations specified
for the mechanical seal used.
•Do not run the pump dry or against a closed valve! Dry
operation will cause seal failure within minutes.
•Clean and flush the suction piping before installing and
operating pump. Abrasives including pipe scale, welding slag
and others can rapidly cause seal failure.
Electrical installation.
•A device that can disconnect both the controller and motor
from their power sources should be installed. Such devices
are typically circuit breakers or fusible disconnect switches.
The motor starter should be seen from the disconnecting
device, and the two should never be more than about 50 feet
apart from each other.
•Short circuit and ground fault protection are usually provided
by means of a circuit breaker or fusible disconnect switch.
Wiringinstallation.
•In order for there to be an ease of installation and convenient
control, control panel or motor starter(s) should be placed in
close proximity to the pump.
•Incoming power sources should be checked to ensure that
they are the same voltage and phase as the motors.
ATTENTION.
Pumps with mechanical seals require no adjustment. If the
mechanical seal is altered or replaced with a packing gland,
adjustments may become necessary.

Operation Manual.
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•Based on the voltage and phase that is available, verify that
the starter is able to operate the motor.
Overloadprotection.
The normally closed (N / C) temperature sensor is embedded in the
winding, and detects engine overheating in case of an overload
condition. Thermal sensor triggers shut down when the engine is too
hot and automatically restarts when the pump motor is cooled to a
safe temperature. It is recommended that the thermal sensor
connects to
an alarm to alert the operator that overheating occurred
so that pump operation can be stopped. In case of overload, the
cause should be reviewed and corrected.
Priming.
•As WDM ME pumps are not self-priming, they must be fully
primed before starting. To prime the pump completely fill the
suction line with liquid.
•If the suction head of the pump is positive, the suction valve
should be opened allowing liquid to enter pump the casing.
Then air vents should be opened, forcing all air out of the
pump by liquid before closing the vents.
•If pump has a suction lift, priming may be accomplished by
the use of foot valves or ejectors, or by manual filling of the
pump casing and suction line.
CAUTION.
Operation of the pump while dry will result in serious
damage.

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Pre-start checklist.
Before starting the pump, the following inspections should be made:
•All wiring to the motor and starting device should match the
wiring diagram. The motor should move in a clockwise
rotation when looking at it from the back. If the motor has
been in storage for any length of time, whether used or new,
then consult the motor instructions before starting. Use the
motor data plate to check the voltage, phase, and line circuit
frequency.
•In order to make sure it rotates freely, use your hands to turn
the rotating element..
•All piping should be checked for leaks. Also all flange bolts
should be checked to make sure they are tightened securely..
•Write down the serial number of the pump for future
reference.
•Perform an insulation (or megger) test on the motor before
putting the pump into service.
•Resistance values (ohms), voltage, and current (amps)
should all be recorded and saved for future reference.
Motor rotation.
WARNING.
.
The pump should be operated within the conditions on the
name plate in order to protect the safety of the operator. If operated
outside such conditions, the pump could fail causing injury to operating
personal. In order to properly operate and maintain the pump and its
components, an instruction book should be consulted.
CAUTION.
To check the driver rotation, make sure pump and driver
couplings are fully disconnected and separated physically. Serious
damage will occur to both the pump and driver if the rotation is wrong.

Operation Manual.
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Before checking motor rotation, make sure all components in the
system are wired and properly connected. If so then check the motor
rotation as follows::
If a 3 phase unit (only) – energize the motor briefly to make sure the
rotation is going in the direction indicated by the arrow in the pump
volute. If the rotation is not following the arrow, then switch the two
wires from the motor starter’s terminal.
4. Starting the pump.
Once the pump is primed, start the pump by turning on the power to the
motor as instructed in the motor manual and follow this recommendation:
• Check for pressure leaks, make an immediate visual inspection
of the pump and suction piping.
• Upon the pump reaching full operating speed, begin to open the
discharge gate valve slowly until complete system flow is
achieved.
• The discharge pipe should also be checked for pressure leaks.
• If there are pressure gauges on the pump, record pressure
readings to use as a reference in the future
• Also make sure the pump is falling within the parameters of the
performance curve.
CAUTION.
As pumps should not be operated while dry, be extremely
cautious in making sure the motor is energized only momentarily, just
long enough to determine if the rotation is proper.
WARNING.
If a pump is operated without an approved coupling guard in
place, it may result in injury to personnel operating the
pump.
Coupling guard should be installed on flexible
coupled units.

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• Check and record Voltage, amperage per phase, and kilowatts.
Voltage regulation.
While the motor will operate satisfactorily under these voltage and
frequency variations, such operation may not be in accordance with
the standards established for operation in underrated conditions:
•Variation in the voltage may not exceed ± 10% the rating
specified on the motor data plate.
•Frequency variation may not exceed ± 5% the rating
specified on the motor data plate.
•The sum of the voltage and frequency variation may not
exceed ± 10% the motor rating while the frequency variation
does not exceed ± 5%.
Pump shutdown.
The following shutdown procedures will apply in most normal shut-
downs for the WDM pumps types ME. If pump will be inoperative for
an extended length of time, follow storage procedures:
•Close the discharge gate valve slowly to prevent hydraulic
shock, and then cut power to the motor.
•Cut power to motor.
Short duration shutdown.
For temporary or overnight shutdowns in conditions above
freezing, pumps may remain filled with liquid. Pumps should be
primed again fully before restarting
Extended period shutdown.
If the shutdown is for a longer period of time, or for pump
maintenance, close the suction gate valve. If a suction gate valve is
not used, but there is a positive suction head, proceed to drain all
liquid from suction line in order to end the liquid flow to the suction
nozzle. All plugs in drains and vent traps should be removed and all
liquid drained from the pump casing.

Operation Manual.
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Restart: Any time the pump is restarted, but especially when
the pump has been drained, you should check to make sure
the pump is refilled back to the level required.
5. Maintenance.
Before attempting any inspection or repair on the pump, the driver
controls must be in the “OFF” position, locked and tagged to prevent
injury to personnel performing service on the pump.
Motor lubrication.
To lubricate the motor, remove the grease drain plug (if present) and
filler plug on the grease fitting. Proceed to grease with clean lubricant
until you can see grease appear at the drain hole or along the motor
shaft. This may be done while motor is running or resting.
Table 1. Recommended Lubrication Periods.
Motor rpm Motor hp Operation conditions
Standard Severe Extreme
0 - 1750
1/3-7-1/2 3 years 1 year 6 months
10-40 1-3 years 6 months-1 year 3 months
50-150 1 year 6 months 3 months
200 and UP 6 months 3 months 3 months
Above 1,750 (All hp) 6 months 3 months 3 months
Standard conditions: Operation 8 hours per day, regular or light loading, clean air,
below 100ºF (38ºC) ambient temperature.
Severe conditions: 24 hours operation, shock loading or vibration, reduced
ventilation, ambient temperature between 100ºF to 150ºF (38ºC to 66ºC).
Extreme conditions: Nonstop operation, heavy shock or vibration, dirt or
dust in air, under extreme ambient temperature.
WARNING.
If equipment is rotating, do not attempt to complete any
maintenance, inspection, repair, or cleaning until rotation has stopped
as such actions could result in injury to personnel..

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ME Pumps.
One-half to one cubic inch of grease is sufficient for motors 5.0 hp
and under, with proportionately more grease for greater HP motors.
•“Sealed-for-life” bearings do not require any further
lubrication during the life of the motor. These are most
fractional motors and some integral frame motors. Always
follow motor manufacturer’s lubrication instructions. Make
sure to periodically check grease fittings and drain plugs for
leaks.
•Below,Table 2 lists recommended types of greasefor both
pump and motor lubrication. These types have all been
thoroughly tested and should be used whenever possible.
Table 2. Recommended Lubricants.
Manufacturer Lubricant
Shell Dolium®R
Exxon Polyrex
Chevron SRI Grease NLGI 2
Black Pearl-NLGI 2
Texaco Polystar RB
•Remove grease drain plug (if present) and the filler plug in order to
lubricate greased bearings, and then add clean lubricant until it
appears at the drain hole or along the shaft. For units that contain a
drain hole, all old grease can be cleaned out before putting new grease
in. If done, leave the drain unplugged for several minutes during the
pumping operation in order to allow excess grease to be forced out.
•Fresh lubricant should be applied every 1 to 3 months,
depending on the severity of environment the pump is in. The
better the environment, (clean, dry, and under 100 °F) the
longer the interval, not to exceed 3 months. Make sure to not
over grease as doing so can cause premature failure.

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Operation Manual.
6. Disassembling the pump
Below are outlined instructions to completely disassemble the pump.
In order to perform maintenance, only disassemble as far as required.
•Turn off power.
•Drain system, including. flushing, if necessary.
•Closed coupled units and remove bolts that hold down the
motor.
•Remove casing bolts.
•Remove back pull-out casing.
•Unscrew impeller nut.
•To remove the impeller from the shaft, use the appropriate
size gear puller aligned behind the impeller vanes.
•Remove impeller key.
•Remove the backplate bolts and backplate.
•To replace the shaft sleeve, heat evenly to about 350°F in
order to loosen the Loctite and then twist the sleeve off.
•Remove motor bracket.
•Remove Slinger.
•Replace lip seals if worn or damaged..
•Check shaft for runout at the sleeve area.
CAUTION.
Do not insert screwdriver between impeller vanes to prevent
rotation. It may be necessary to use a strap wrench around the impeller
or shaft to prevent rotation.

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ME Pumps.
Below is a chart with the specifications necessary for the
identification of each of the pump parts listed above.
ME Parts List

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Operation Manual.
ITEM
Description
1
Slinger
2
Mechanical Seal
3
Impeller Washer
4
Steel base brackets
5
Shaft Sleeve
6
Lock Washer
7
Impeller Hex Bolt
8
Bracket Lock Washer
9
Bracket Hex Bolt
10
Base Hex Bolt
11
Washer
12
Motor
13
Motor Bracket
14
Casing Gasket
15
Impeller
16
Casing (Volute)
7. Reassembly of pumps.
•Before reassembly, all parts should be thoroughly cleaned.
•To identify required replacement items refer to the parts list.
When ordering the parts, have the pump serial or catalog
number available.
•To reassemble follow the reverse of the disassembly
instructions.
•If all mechanical seal components are not in good condition,
leakage may occur. In order to prevent leakage, completely
replace the seal..
•New shaft sleeves are installed by bonding to shaft with
hydraulic setting Locktite.