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Liquiflo Installation, Operation & Maintenance Manual
Section 3:
Pump & Motor Installation
3.1
Installation Location of Pump, Motor & Base
Refer to the Hydraulic Institute Standards for installation procedures of the base, pump and motor.
1 The pump inlet should be as close to the liquid source as practical and preferably below it. Even though gear
pumps have self priming and lift capability, many issues can be avoided with a flooded suction configuration.
NOTE: The pump models covered in this manual are close-coupled and
no alignment procedure between the pump and motor is required.
3.2
General Piping Requirements
Refer to Hydraulic Institute Standards for piping guidelines.
1 All piping must be supported independently and must line up naturally with pump ports.
Caution!
Do not use the pump to support the piping or allow the piping to
apply stress to the pump ports. This can distort the alignment of the
pump housing with internal parts and lead to rapid wear or malfunction.
2
Piping that handles both hot and cold liquids require proper installation of expansion loops and
joints so that thermal expansion of the piping will not cause misalignment.
3
Suction and discharge piping should be the same size or larger than the inlet and outlet ports. This
is especially important for viscous services when the pipe diameter has a large effect on friction losses
and NPSH available.
3.3
Relief Valves
1
A positive displacement pump should have a pressure relief valve installed in the discharge line.
Operating a gear pump against a closed discharge valve will result in over pressure and likely failure of the
pump or system. Install the relief valve between the pump discharge port and the discharge isolation valve
Ideally, the relief valve should bypass the discharge line back to the supply tank. Where this is not feasible,
piping the relief valve back to the suction side of the pump will prevent immediate pump failure from over
pressure, however, continuously running in this condition will cause heating of the fluid.
H&3-Series MAG-DRIVE Gear Pumps
Models H1F-H9F, 31F-39F & 311F
1 0
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