Graymills MSPR User Manual

WARNINGS/CAUTIONS

Read all these SAFETY INSTRUCTIONS BEFORE
installing or using this equipment. Keep this manual
handy for reference/training.

• Inspect unit for damage. Report any damage to carrier/dealer
immediately.

• Pump may be heavy. If in doubt, take appropriate precau­tions.

• Motor must be grounded and suitable for the environment in
which it is used. Do not use where explosion-proof motors
are required.

• Do not allow liquids to come into contact with the motor, or
any electrical components.

• Never attempt any service work while the unit is still con­nected to any electrical power source.

• This pump contains rotating parts. Use caution.

• When working on or around pump, be aware of what liquid
is/has been pumped. If liquid is potentially harmful, take
appropriate precautions.

• Never use any part of the wiring/electrical system to lift or
move the equipment. This could cause a failure of the electri­cal system, resulting in severe shock or death.

• Do not operate this pump or allow others to operate it until
the instructions and warnings have been read and are under­stood by all involved.

Never work with equipment you feel may be unsafe.
Contact your Supervisor immediately.

DESCRIPTION/SPECIFICATIONS

The Graymills MSPR Series pumps are multi-stage centrifugal
pumps designed to handle water-based coolants and water.

• Maximum liquid temperature 160°F (72°C).

• Maximum viscosity 300 SSU.

• Maximum suction pressure 75psi.

• Pipe connections are 1" NPT suction and discharge. 1/4"
NPT Bypass is included.

• Rotation: left hand, ie, COUNTERCLOCKWISE when
viewed from motor end.

POWER SUPPLY, WIRING AND
GROUNDING

WARNING

Install ground and wiring according to local and
National Electrical Code requirements.

• Install a disconnect switch on all power legs near
the pump.

• Disconnect and lockout electrical supply before
installing or servicing pump.

• 230/460V, 3 phase, 60 cycle AC circuit rated for a minimum
of 10 amps. Refer to motor nameplate for instructions.

• Electrical supply MUST match pump’s name plate specifica­tions. Incorrect voltage can cause fire and/or damage to the
motor and voids warranty.

• All three phase motors not protected for overload conditions
MUST be provided with a starter which includes heaters.

• Use only stranded copper wire to motor and ground. The
ground wire MUST be at least as large as the wire to the
motor. Wires should be color coded for ease of maintenance.

• Follow motor manufacturer’s wiring diagram on the motor
nameplate or terminal cover carefully.

WARNING

Failure to permanently ground the pump, motor and
controls before connecting to electrical power can
cause shock, burns or death.

Multi-Stage
Centrifugal MSPR
Pumps

Operations and
Maintenance
Instructions

795-07945

GM02-05

ROTATION

NOTICE: Incorrect rotation may cause damage to pump

in as little as 5 seconds and will void the warranty.

• Correct rotation is left-hand, COUNTERCLOCKWISE when
viewed from the motor end.

• Rotation can be verified by quickly energizing the pump for
an INSTANT with a quick on/off motion.

• To reverse three phase motor rotation interchange any two
power supply leads.

PIPING

• Piping should be no smaller than the pump discharge. Piping
should be kept as short as possible, avoiding unnecessary fit­tings to minimize friction losses.

• All piping MUST be independently supported and MUST
NOT place any piping loads on the pump. It should “line up”
naturally.

• All joints MUST be airtight. Use 3 - 4 wraps of Teflon™
tape to seal threaded connections.

CAUTION

Never draw piping into place by forcing the pump
discharge connections.

INSTALLATION

WARNING

Multi-stage pumps produce considerable shut-off
pressure. Hoses and associated plumbing used with
these pumps should be rated for a minimum working
pressure of 180 psi. Failure to heed this warning
could result in ruptured lines and possible injury to
personnel.

• Maximum operating pressure: 175psig at 200°F

• Minimum and maximum liquid levels must be maintained for
proper pump operation. See Figure 1.

• Allow adequate space for servicing and ventilation. Protect
from freezing and flooding.

WARNING

• Use clean fluids only; no chips, grit or other foreign
particles.

• Graymills recommends the use of an inlet strainer
to minimize the size and amount of debris that

enters the pump. Contamination drawn into the
pump can cause internal damage and is not cov­ered under warranty. Consult factory for recom­mendations as to the appropriate size and type of
strainer to use.

• High Pressure Filters for keeping fluid clean must be used.
Graymills can provide the filter to trap particles, scale and
contaminants to prevent costly damage. Filter collects up to
20 cu. in. of material (HPFB20) without pressure drop.
Available in 14" length single cartridge model (HPFB10) or
24" length dual cartridge model (HPFB20). All models are
304 stainless steel for use with water-soluble and corrosive
liquids. Reusable stainless steel cartridges available in 10, 50,
and 100 mesh.

OPERATION

CAUTION

• Before starting, pump must be primed (free of air)
and discharge valves partially open.

• Do not run pump dry; damage to mechanical seal
will result.

• Use a Check valve on plumbing if pump is mounted
horizontally or if the potential to lose prime can
occur.

• Do not run against closed nozzles or damage to
pump and piping will result. Use Bypass as
described below.

• Do not operate at or near zero flow.

• If operating at or below 8 GPM or
where valves may be opened and
closed periodically, you must use a
bypass. This kit (Bypass Kit
C-32450) installs in the side of the
discharge head and provides a fluid
bypass when the pump is operated
against a closed discharge thus
preventing excessive heat build-up
which will damage the pump.

• After stabilizing the system at
normal operating conditions, check
the piping. If necessary, adjust the
pipe supports.

• To ensure proper suction, fluid level should cover first two
impellers (5" from the suction end of the pump).

• Pump may be mounted horizontally with included horizontal
mounting bracket.

• If pump is not generating enough pressure or flow, see
“TROUBLESHOOTING GUIDE”.

MAINTENANCE

WARNING

Failure to disconnect and lockout electrical power
before attempting any maintenance can cause shock,
burns or death.

• Motors have permanently lubricated bearings. No lubrication
is possible or necessary. Follow the motor manufacturer’s
recommendations for maintenance.

• To REMOVE pump from service, drain all fluid from pump
and piping.

Figure 1

Bypass Kit Diagram