Goulds e-530SC Marlow Series User manual

INSTRUCTION MANUAL
P2002888 Rev B
e-530SC
e-531SC
Marlow Series e-530SC and
e-531SC

Table of Contents
1 Introduction and Safety..............................................................................................................3
1.1 Introduction.......................................................................................................................... 3
1.2 Safety..................................................................................................................................... 3
1.2.1 Safety terminology and symbols.................................................................................3
1.2.2 Safety instruction decals.............................................................................................. 4
1.3 User safety.............................................................................................................................5
1.3.1 Wash the skin and eyes................................................................................................6
1.4 Protecting the environment................................................................................................6
2 Transportation and Storage...................................................................................................... 7
2.1 Examine the delivery........................................................................................................... 7
2.1.1 Examine the package................................................................................................... 7
2.1.2 Examine the unit............................................................................................................7
2.2 Lifting methods.................................................................................................................... 7
2.3 Long-term storage............................................................................................................... 8
3 Product Description................................................................................................................. 10
3.1 General description...........................................................................................................10
3.2 Operational specifications................................................................................................10
4 Installation................................................................................................................................. 12
4.1 Preinstallation.....................................................................................................................12
4.1.1 Pump location guidelines..........................................................................................12
4.1.2 Foundation requirements..........................................................................................13
4.1.3 Piping checklist........................................................................................................... 14
4.2 Install the pump with motor (e-531SC)........................................................................... 14
4.3 Level the base on a concrete foundation for pump with base (e-531SC).................. 15
4.4 Grout the baseplate(e-531SC)......................................................................................... 15
4.5 Install the piping................................................................................................................ 16
5 Commissioning, Startup, Operation, and Shutdown.......................................................... 17
5.1 Preparation for startup...................................................................................................... 17
5.2 Prime the pump................................................................................................................. 17
5.3 Start the pump....................................................................................................................18
5.4 Pump operation precautions............................................................................................18
5.5 Shut down the pump.........................................................................................................19
5.6 Note on the packed pump operation............................................................................. 19
6 Maintenance..............................................................................................................................20
6.1 Bearing maintenance........................................................................................................ 20
6.2 Disassembly........................................................................................................................20
6.2.1 Disassembly precautions...........................................................................................20
6.2.2 Drain the pump...........................................................................................................20
6.2.3 Remove the rotating assembly and motor.............................................................. 20
6.2.4 Remove the mechanical seal (e-530SC/e-531SC and e-530SC/e-531SC-F)...... 21
6.2.5 Remove the seal or packing rings (e-530SC/e-531SC-S, e-530SC/e-531SC-
D, e-530SC/e-531SC-PF).................................................................................................21
6.2.6 Impeller trimming guidelines....................................................................................21
6.3 Pre-assembly inspections................................................................................................. 22
6.3.1 Shaft and sleeve inspection.......................................................................................22
Table of Contents
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 1

6.4 Reassembly.........................................................................................................................23
6.4.1 Seal assembly..............................................................................................................23
6.4.2 Assemble the packed stuffing box (e-530SC.e-531SC-PF)................................... 25
6.4.3 Reinstall the rotating assembly and motor..............................................................25
6.4.4 Capscrew torque values............................................................................................ 26
6.4.5 Dealer servicing ......................................................................................................... 26
7 Product warranty...................................................................................................................... 27
Table of Contents
2 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL

1 Introduction and Safety
1.1 Introduction
Purpose of this manual
The purpose of this manual is to provide necessary information for:
•Installation
• Operation
• Maintenance
CAUTION:
Read this manual carefully before installing and using the product. Improper use of the
product can cause personal injury and damage to property, and may void the warranty.
NOTICE:
Save this manual for future reference, and keep it readily available at the location of the
unit.
1.2 Safety
WARNING:
•The operator must be aware of safety precautions to prevent physical injury.
• Operating, installing, or maintaining the unit in any way that is not covered in this
manual could cause death, serious personal injury, or damage to the equipment. This
includes any modification to the equipment or use of parts not provided by Xylem. If
there is a question regarding the intended use of the equipment, please contact a
Xylem representative before proceeding.
• Do not change the service application without the approval of an authorized Xylem
representative.
CAUTION:
You must observe the instructions contained in this manual. Failure to do so could result
in physical injury, damage, or delays.
1.2.1 Safety terminology and symbols
About safety messages
It is extremely important that you read, understand, and follow the safety messages and
regulations carefully before handling the product. They are published to help prevent
these hazards:
•Personal accidents and health problems
• Damage to the product and its surroundings
• Product malfunction
Hazard levels
Hazard level Indication
DANGER: A hazardous situation which, if not avoided, will result in
death or serious injury
1 Introduction and Safety
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 3

Hazard level Indication
WARNING: A hazardous situation which, if not avoided, could result
in death or serious injury
CAUTION: A hazardous situation which, if not avoided, could result
in minor or moderate injury
NOTICE: Notices are used when there is a risk of equipment
damage or decreased performance, but not personal
injury.
Special symbols
Some hazard categories have specific symbols, as shown in the following table.
Electrical hazard Magnetic fields hazard
Electrical Hazard: CAUTION:
1.2.2 Safety instruction decals
WARNING:
Do NOT exceed the maximum working pressure of the pump. This information is listed on
the nameplate of the pump.
Alert symbol
This safety alert symbol is used in manuals and on the safety instruction decals on the pump
to draw attention to safety-related instructions.
When used, the safety alert symbol means that failure to follow the instructions may result in
a safety hazard.
Decals
Make sure your pump has these safety instruction decals and that they are located as this
figure shows. If the decals are missing or illegible, contact your local sales and service
representative for a replacement.
1 Introduction and Safety
4 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL

Make sure that all safety instruction decals are always clearly visible and readable.
1.3 User safety
General safety rules
These safety rules apply:
• Always keep the work area clean.
• Pay attention to the risks presented by gas and vapors in the work area.
• Avoid all electrical dangers. Pay attention to the risks of electric shock or arc flash
hazards.
• Always bear in mind the risk of drowning, electrical accidents, and burn injuries.
Safety equipment
Use safety equipment according to the company regulations. Use this safety equipment
within the work area:
• Hard hat
• Safety goggles, preferably with side shields
• Protective shoes
• Protective gloves
• Gas mask
• Hearing protection
• First-aid kit
• Safety devices
NOTICE:
Never operate a unit unless safety devices are installed. Also see specific information
about safety devices in other chapters of this manual.
1 Introduction and Safety
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 5

Electrical connections
Electrical connections must be made by certified electricians in compliance with all
international, national, state, and local regulations. For more information about
requirements, see sections dealing specifically with electrical connections.
Precautions before work
Observe these safety precautions before you work with the product or are in connection
with the product:
• Provide a suitable barrier around the work area, for example, a guard rail.
• Make sure that all safety guards are in place and secure.
• Make sure that you have a clear path of retreat.
• Make sure that the product cannot roll or fall over and injure people or damage
property.
• Make sure that the lifting equipment is in good condition.
• Use a lifting harness, a safety line, and a breathing device as required.
• Allow all system and pump components to cool before you handle them.
• Make sure that the product has been thoroughly cleaned.
• Disconnect and lock out power before you service the pump.
• Check the explosion risk before you weld or use electric hand tools.
1.3.1 Wash the skin and eyes
Follow these procedures for chemicals or hazardous fluids that have come into contact
with your eyes or your skin:
Condition Action
Chemicals or hazardous fluids in
eyes
1. Hold your eyelids apart forcibly with your fingers.
2. Rinse the eyes with eyewash or running water for at least 15 minutes.
3. Seek medical attention.
Chemicals or hazardous fluids on
skin
1. Remove contaminated clothing.
2. Wash the skin with soap and water for at least 1 minute.
3. Seek medical attention, if necessary.
1.4 Protecting the environment
Emissions and waste disposal
Observe the local regulations and codes regarding:
• Reporting of emissions to the appropriate authorities
• Sorting, recycling and disposal of solid or liquid waste
• Clean-up of spills
Exceptional sites
CAUTION: Radiation Hazard
Do NOT send the product to Xylem if it has been exposed to nuclear radiation, unless
Xylem has been informed and appropriate actions have been agreed upon.
Recycling guidelines
Always follow local laws and regulations regarding recycling.
1 Introduction and Safety
6 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL

2 Transportation and Storage
2.1 Examine the delivery
2.1.1 Examine the package
1. Examine the package for damaged or missing items upon delivery.
2. Record any damaged or missing items on the receipt and freight bill.
3. If anything is out of order, then file a claim with the shipping company.
If the product has been picked up at a distributor, make a claim directly to the
distributor.
2.1.2 Examine the unit
1. Remove packing materials from the product.
Dispose of all packing materials in accordance with local regulations.
2. To determine whether any parts have been damaged or are missing, examine the
product.
3. If applicable, unfasten the product by removing any screws, bolts, or straps.
Use care around nails and straps.
4. If there is any issue, then contact a sales representative.
2.2 Lifting methods
WARNING:
• Assembled units and their components are heavy. Failure to properly lift and support
this equipment can result in serious physical injury and/or equipment damage. Lift
equipment only at the specifically identified lifting points. Lifting devices such as
eyebolts, slings, and spreaders must be rated, selected, and used for the entire load
being lifted.
• Crush hazard. The unit and the components can be heavy. Use proper lifting methods
and wear steel-toed shoes at all times.
Table 1: Methods
Pump type Lifting method
A pump without base. Use a suitable sling attached properly to solid points under the casing and motor.
A base-mounted pump.
(e-531SC only)
Use slings under the pump casing and the drive unit, under the base rails, or
through lifting lugs, when provided.
2 Transportation and Storage
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 7

Examples
Figure 1: Example of a proper lifting method for pump without base
Figure 2: Example of a proper lifting method for base mounted pump (e-531SC only)
Figure 3: Example of a proper lifting method using lifting lugs for base mounted pump (e-531SC
only)
2.3 Long-term storage
If the unit is stored for more than 6 months, these requirements apply:
2 Transportation and Storage
8 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL

• Store in a covered and dry location.
• Store the unit free from heat, dirt, and vibrations.
• Rotate the shaft by hand several times at least every three months.
Treat bearing and machined surfaces so that they are well preserved. Refer to the drive
unit manufacturer for their long-term storage procedures.
For questions about possible long-term storage treatment services, please contact your
local sales and service representative.
2 Transportation and Storage
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 9

3 Product Description
3.1 General description
Description
The pump is a centrifugal, close-coupled pump. The following pump features make it easy
to install, operate, and service:
• High efficiency
• Rugged stainless steel-fitted construction
• Footless e-530SC or Foot-mounted e-531SC volute
Intended applications
WARNING:
This product can expose you to chemicals including lead, which is known to the state of
California to cause cancer and birth defects or other reproductive harm. For more
information go to: www.P65Warnings.ca.gov
The pump is intended for use with these pumped fluids:
• Unheated domestic and fresh water
• Boiler feed water
• Condensate
• Hydronic cooling or heating
• Benign liquids
• Pressure boosting
• General liquid transfer
Rotation
3.2 Operational specifications
Mechanical seal specifications
Seal type/
Parameter
Standard seal,
BUNA/Carbon/
Ceramic
Optional seal,
EPR/Carbon /
Tungsten
Carbide
Optional seal,
FKM/Carbon /
Ceramic
Optional seal,
EPR/Silicon
Carbide/Silicon
Carbide
Optional seal,
EPR/Carbon /
Tungsten
Carbide with
external
flush1,3,4
Packing2
Operating
temperature
range, °F (°C)
-20 to 225 (-29
to 107)
-20 to 250 (-29
to 121)
-10 to 225 (-23
to 107)
-20 to 250 (-29
to 121)
-20 to 250 (-29
to 121)
0 to 200 (-18
to 93)
pH range limits 7.0 to 9.0 7.0 to 11.0 7.0 to 9.0 7.0 to 12.5 7.0 to 9.0 7.0 to 9.0
Resistance to
dissolved
solids
Low Low-Medium Low Medium-High Low-Medium Medium
Maximum
glycol/water
concentration
50/50% 50/50% 50/50% 60/40% 50/50% Not
recommended
Table notes
3 Product Description
10 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL

1. An external flush is required on low pressure systems that contain a high concentration
of abrasives.
2. Use packing on open or closed systems which require a large amount of makeup
water, as well as systems that are subjected to a wide variety of chemical conditions
and solids buildup.
3. For operating temperatures above 250°F, a cooled flush is required and is
recommended for temperatures above 225°F for optimum seal life. On closed
systems, cooling is accomplished by inserting a small heat exchanger in the flush line
to cool the seal flushing fluid.
4. Flush-line filters and sediment separators are available on request.
3 Product Description
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 11

4 Installation
4.1 Preinstallation
Precautions
WARNING:
• When installing in a potentially explosive environment, make sure that the motor is
properly certified.
• You must ground (earth) all electrical equipment. This applies to the pump equipment,
the driver, and any monitoring equipment. Test the ground (earth) lead to verify that it
is connected correctly.
NOTICE:
Supervision by an authorized Xylem representative is recommended to ensure proper
installation. Failure to do so may result in equipment damage or decreased performance.
Evaluate the installation in order to determine that the Net Positive Suction Head Available
(NPSHA) meets or exceeds the Net Positive Suction Head Required (NPSHR), as stated by
the pump performance curve.
4.1.1 Pump location guidelines
WARNING:
Assembled units and their components are heavy. Failure to properly lift and support this
equipment can result in serious physical injury and/or equipment damage. Lift equipment
only at the specifically identified lifting points. Lifting devices such as eyebolts, slings, and
spreaders must be rated, selected, and used for the entire load being lifted.
Guideline Explanation/comment
Keep the pump as close to the liquid source as
practically possible.
This minimizes the friction loss and keeps the suction piping
as short as possible.
Make sure that the space around the pump is
sufficient.
This facilitates ventilation, inspection, maintenance, and
service.
If you require lifting equipment such as a hoist or
tackle, make sure that there is enough space above
the pump.
This makes it easier to properly use the lifting equipment and
safely remove and relocate the components to a safe location.
Protect the unit from weather and water damage due
to rain, flooding, and freezing temperatures.
This is applicable if nothing else is specified.
Do not install and operate the equipment in closed
systems unless the system is constructed with
properly-sized safety devices and control devices.
Acceptable devices:
• Pressure relief valves
• Compression tanks
• Pressure controls
• Temperature controls
• Flow controls
If the system does not include these devices, consult the
engineer or architect in charge before you operate the pump.
Take into consideration the occurrence of unwanted
noise and vibration.
The best pump location for noise and vibration absorption is
on a concrete floor with subsoil underneath.
If the pump location is overhead, undertake special
precautions to reduce possible noise transmission.
Consider a consultation with a noise specialist.
When possible, locate the pump below the fluid
level.
This facilitates priming, ensures a steady flow of liquid, and
provides a positive suction head on the pump.
4 Installation
12 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL

4.1.2 Foundation requirements
Requirements
• The foundation must be able to absorb any type of vibration and form a permanent,
rigid support for the unit.
• The foundation must weigh at least 2-1/2 times the weight of the pump unit.
• Provide a flat, substantial concrete foundation in order to prevent strain and distortion
when you tighten the foundation bolts. Tie the concrete pad in with the finished floor.
Bolt installation — pump to concrete
• Use some type of expansion fitting in order to facilitate easy servicing. Insert the
female portion into a suitable hole in the pad so that its top surface is flush with the
pad surface. Thus, when the hold-down bolts are removed, the motor can be removed
by sliding it back from the pump.
•
Correct
Incorrect
Bolt installation with baseplate e-531SC
• Sleeve-type and J-type foundation bolts are most commonly used. Both designs allow
movement for the final bolt adjustment.
• Use foundation bolts and larger pipe sleeves to give room for final bolt location.
2
3
1
4
1. Foundation bolt
2. Pipe sleeve
3. Washer
4. Built-up concrete foundation
4 Installation
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 13

4.1.3 Piping checklist
WARNING:
• The heating of water and other fluids causes volumetric expansion. The associated
forces can cause the failure of system components and the release of high-
temperature fluids. In order to prevent this, install properly sized and located
compression tanks and pressure-relief valves. Failure to follow these instructions can
result in serious personal injury or death, or property damage.
• Avoid serious personal injury and property damage. Make sure that the flange bolts
are adequately torqued.
NOTICE:
Never force piping to make a connection with a pump.
Check Explanation/comment Checked
Check that a section of straight pipe, with a length that
is five times its diameter, is installed between the
suction side of the pump and the first elbow.
This reduces suction turbulence by
straightening the flow of liquid before it enters
the pump.
Check that the suction and discharge pipes are
supported independently by use of pipe hangers near
the pump .
This eliminates pipe strain on the pump .
Check that there is a strong, rigid support for the
suction and discharge lines.
As a rule, ordinary wire or band hangers are not
adequate to maintain proper alignment.
For pumps with flanges, check that the bolt holes in
the pump flanges match the bolt holes in the pipe
flanges.
—
Check that the suction or discharge lines are not
forced into position.
Coupling and bearing wear will result if suction
or discharge lines are forced into position.
Check that fittings for absorbing expansion are
installed in the system when considerable
temperature changes are expected.
This helps to avoid strain on the pump.
Check that you have a foot valve of equal or greater
area than the pump suction piping when you use in
an open system with a suction lift.
Prevent clogging by using a strainer at the
suction inlet next to the foot valve. Make sure
that the strainer has an area three times that of
the suction pipe with a mesh hole diameter of
no less than 0.25 in. (0.64 cm).
Check that flexible piping is used on both the suction
and discharge sides of the pump when you use an
isolation base.
—
Check that a properly sized suction strainer
conforming to NSF/ANSI Standard 50 is installed in
the suction line.
Prevents clogging. Make sure the strainer has
an area three times that of the suction pipe with
a mesh hole diameter of no less than 0.25 in.
(0.64 cm).
Check that the pipeline has isolation valves around
the pump and has a drain valve in the suction pipe.
—
Use PTFE tape sealer or a high quality thread sealant
when you install the suction and discharge
connections to a threaded pump housing.
—
4.2 Install the pump with motor (e-531SC)
1. Place the pump with motor where it will be mounted, on the floor, on a raised concrete
pad or on a base, with two 0.060 in (1.5 mm) thick shims provided under each of the
four hold down bolt locations of the pump volute feet. With certain tall motors and
short pumps, one or two additional 1” (25.4 mm) thick steel shims will be provided to
4 Installation
14 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL

go under the pump casing feet to make the volute level with the bottom of the motor
support or motor feet.
2. Then add additional shims at each of the four volute hold down bolt locations, as
required, until the volute feet are fully supported, the pump discharge flange is level,
and there is a gap under the motor saddle or motor feet. Tighten the four bolts at the
volute feet.
3. Loosen the bolts between the motor and the motor saddle, when a saddle is used, and
fill any gaps to fully support the motor by adding shims under the motor feet at each of
the motor’s four hold down bolt locations, as required, until all four hold down hole
locations of the motor saddle or motor feet contact the floor, pad, or base. Tighten the
bolting between the motor and motor saddle, when a saddle is used.
4. When mounted on a baseplate, then tighten the four hold down bolts at the corners of
the motor support or motor feet. For pumps mounted directly on the floor or concrete
pad, all four motor saddle or motor hold down bolt locations must be in contact with
the floor or pad, but hold down bolting at these locations is optional.
5. If any hold down bolt tightening results in pump movement that could induce stress in
the pump frame, stop and re-shim the pump volute, motor saddle or motor.
4.3 Level the base on a concrete foundation for pump with base
(e-531SC)
1. Place the pump on its concrete foundation.
2. Place 1.00 in./(25.40 mm) thick steel shims or wedges on both sides of each anchor
bolt in order to support the pump .
This also provides a means of leveling the base.
4
1
5
2
3
6
7
8
1. Pump Base Rail
2. Grout only to top of base rail
3. Locate the shims to allow removal after grouting.
4. Grout
5. Concrete foundation
6. Shims
7. 1” (25.40 mm) Gap
8. Allow 1” for shims. Place on both sides of anchor bolts.
4.4 Grout the baseplate(e-531SC)
Required equipment:
• Cleaners: Do not use an oil-based cleaner because the grout will not bond to it. See
the instructions provided by the grout manufacturer.
• Grout: Non-shrink grout is required.
1. Clean all the areas of the baseplate that will come into contact with the grout.
2. Build a dam around the foundation.
3. Thoroughly wet the foundation that will come into contact with the grout.
4. Pour grout into the baseplate up to top of the base rails.
Locate shims to allow removal after grouting.
4 Installation
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 15

When you pour the grout, remove air bubbles from it by using one of these methods:
– Puddle with a vibrator.
– Pump the grout into place.
5. Allow the grout to set. It is recommended to remove shims, retighten anchor bolts, and
fill shim gaps with grout.
4.5 Install the piping
Connect piping to pump without pipe strain on the pump.
4 Installation
16 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL

5 Commissioning, Startup,
Operation, and Shutdown
5.1 Preparation for startup
WARNING:
• Failure to follow these precautions before you start the unit will lead to serious
personal injury and equipment failure.
• Do not operate the pump below the minimum rated flows or with the suction or
discharge valves closed. These conditions can create an explosive hazard due to
vaporization of pumped fluid and can quickly lead to pump failure and physical injury.
• If the pump, motor, or piping operate at extremely high or low temperatures, then
guarding or insulation is required. Failure to follow these instructions can result in
serious personal injury or death, and property damage.
• Always disconnect and lock out power to the driver before you perform any installation
or maintenance tasks. Failure to disconnect and lock out driver power will result in
serious physical injury.
• Operating the pump in reverse rotation can result in the contact of metal parts, heat
generation, and breach of containment.
NOTICE:
• Verify the driver settings before you start any pump.
• Make sure that the warm-up rate does not exceed 2.5°F (1.4°C) per minute.
You must follow these precautions before you start the pump:
• Flush and clear the system thoroughly to remove dirt or debris in the pipe system in
order to prevent premature failure at initial startup.
• Bring variable-speed drivers to the rated speed as quickly as possible.
• If temperatures of the pumped fluid will exceed 200°F (93°C), then warm up the pump
prior to operation. Circulate a small amount of fluid through the pump until the casing
temperature is within 100°F (38°C) of the fluid temperature.
At initial startup, do not adjust the variable-speed drivers or check for speed governor or
over-speed trip settings while the variable-speed driver is coupled to the pump. If the
settings have not been verified, then uncouple the unit and refer to instructions supplied
by the driver manufacturer.
5.2 Prime the pump
CAUTION:
Do not run the pump dry.
Make sure that the pump body is full of liquid before startup. If the system does not
automatically fill the pump body with liquid, then you must manually prime the pump.
1. Loosen the vent plugs on the pump body.
2. While venting the air from the pump body, rotate the pump shaft a few times by hand.
3. After all air has been purged from the pump, close the vent plugs.
5 Commissioning, Startup, Operation, and Shutdown
Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL 17

5.3 Start the pump
CAUTION:
• Observe the pump for vibration levels, bearing temperature, and excessive noise. If
normal levels are exceeded, shut down the pump and resolve the issue.
Before you start the pump, you must perform these tasks:
• Open the suction valve.
• Open any recirculation or cooling lines.
1. Fully close or partially open the discharge valve, depending on system conditions.
2. Start the driver.
3. Slowly open the discharge valve until the pump reaches the desired flow.
4. Immediately check the pressure gauge to ensure that the pump quickly reaches the
correct discharge pressure.
5. If the pump fails to reach the correct pressure, perform these steps:
a) Stop the driver.
b) Prime the pump again.
c) Restart the driver.
6. Monitor the pump while it is operating:
a) Check the pump for bearing temperature, excessive vibration, and noise.
b) If the pump exceeds normal levels, then shut down the pump immediately and
correct the problem.
7. Repeat steps 5 and 6 until the pump runs properly.
5.4 Pump operation precautions
General considerations
WARNING:
Do NOT exceed the maximum working pressure of the pump. This information is listed on
the nameplate of the pump.
CAUTION:
• Vary the capacity with the regulating valve in the discharge line. Never throttle the flow
from the suction side since this can result in decreased performance, unexpected heat
generation, and equipment damage.
• Do not overload the driver. Driver overload can result in unexpected heat generation
and equipment damage. The driver can overload in these circumstances:
– The specific gravity of the pumped fluid is greater than expected.
– The pumped fluid exceeds the rated flow rate.
• Make sure to operate the pump at or near the rated conditions. Failure to do so can
result in pump damage from cavitation or recirculation.
Operation at reduced capacity
WARNING:
Never operate any pumping system with a blocked suction and discharge. Operation,
even for a brief period under these conditions, can cause confined pumped fluid to
overheat, which results in a violent explosion. You must take all necessary measures to
avoid this condition.
5 Commissioning, Startup, Operation, and Shutdown
18 Marlow Series e-530SC and e-531SC INSTRUCTION MANUAL