Graymills IMP Series Pump OMI - Manual

IMV SERIES PUMPS
795-07383 GM 3-04
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Operations and Maintenance Instructions
GENERAL APPLICATION
IMV Series pumps are designed for use with coolants and other fluids containing rust preventatives.
(Do not use for water circulation).
MAXIMUM VISCOSITY
These pumps will handle viscosities up to 500 SSU. Since viscosity varies according to temperature, care should
be taken during cold weather to assure that viscosity is within the maximum range. If pump is operated beyond
the maximum viscosity range, the motor will be overloaded and will burn out unless overload protection has been
installed. Overload protection is recommended.
ABRASIVE RESISTANCE
IMV Series will handle a relatively large amount of foreign material without damage to the pump because there are
no seals or bearings in the liquid. Sediment, however, should not be allowed to accumulate around the lower
portion of the pump. Such an accumulation can clog the impeller housing creating binding which can damage the
impeller and the motor. Where substantial quantities of foreign material will be present, make sure the pump is
mounted well off the bottom and baffled to prevent accumulation around the impeller.
FLUID LEVELS
IMV Series Pumps have an intake above the impeller that must be covered to assure satisfactory pumping.
Maximum liquid level is 1" below the motor. Minimum level is 1" above inlet.
PIPING AND FITTINGS
These pumps deliver a large volume of liquid at low pressure. The pump may be throttled to adjust desired flow
without the need for a bypass or relief valve. The pump will use less horsepower as flow is reduced. Flow rate is
influenced greatly by restrictions such as small piping and numerous fittings. It is advisable to use pipe or hose of
the same size as the pump discharge. If reductions must be made, do so as close to the point of application as
possible. Needle and globe valves greatly restrict flow. Gate valves with minimum restrictions are recommended.
A 90° elbow offers unusual resistance and should not be used.
TEMPERATURE LIMITATIONS
Pumps with plastic impellers can be used with temperatures up to 180°F. Temperatures higher than 180°F will not
damage aluminum impellers but motor must be protected from overheating.
ELECTRICAL CONNECTIONS
Pump motor must be grounded. We recommended the use of a fuse in the circuit with up to 10% greater
amperage than indicated on the motor nameplate. This will protect the motor in the event of an overload. Check
to be certain that the electrical supply to be used corresponds to that listed on the motor nameplate. For 3-phase
motors, check the direction of rotation to make sure it is wired to run in a clockwise direction looking down on the
motor.
Motors are sealed and do not require lubrication. Do not restrict vents on fan-cooled motors, and keep oil and
chips from accumulating around the motor.
These motors are not recommended for hazardous locations or liquids. Graymills can provide explosion proof
motors for such purposes.
WHAT TO CHECK IF FLOW IS REDUCED BELOW RATED OUTPUT
a. Is liquid level above intake point?
b. Is anything blocking entrance of liquid into the pump?
c. Are there any unusual restrictions in the piping, such as crimped hose, excess fittings, small tubing, etc.?
d. Is the liquid viscosity too heavy, or did temperature decrease make it so?
e. Check for binding within the body of the pump caused by rags, strings, or chips.
Graymills
3705 N. Lincoln, Chicago, I L 60613 www.Graymills.com (773) 248-6825 Fax: (800) 478-8673