Start-Up & Operation; Precautions Prior To Starting Pump; Operating Requirements; Troubleshooting - Liquiflo H Series Installation, Operation & Maintenance Manual

Liquiflo Installation, Operation & Maintenance Manual
Section 4: Start-Up & Operation
4.1

Precautions Prior to Starting Pump

1) Verify that the pump and motor are suitable for the conditions of service.
2) Verify that all suction and discharge valves are open before starting the pump.
3) Prime the pump and jog the motor to check the rotation. As viewed from the pump end, a
clockwise rotation of the motor will result in fluid discharge to the left; counterclockwise rotation
will result in fluid discharge to the right (see Page 12).
4) The pump is capable of pulling a dry lift, but it is still recommended that the pump be primed
prior to starting.
5) A pressure relief valve should be installed in the discharge line to protect the pump from any
kind of line blockage including the inadvertent closing of an isolation valve.
6) If the fluid contains suspended solids, a filter of at least 400 U.S. Mesh should be installed in the
suction line. Concentration of solids should be limited to 1% by volume.
7) Ensure that all safety devices are installed before operating pump.
4.2

Operating Requirements

1) Do not operate the pump without fluid inside it.
CAUTION! Do not run pump dry for more than
30 seconds or damage to internal parts can result.
2) The pump should be operated with at least 20 PSI (1.4 bar) differential pressure to ensure that
internal components are properly lubricated by the pumped fluid.
3) Adequate suction pressure must be available for the pump to function properly (see NPSHR data
on Page 4).
4) Do not operate the pump outside of its design specifications (see Pages 4 and 5).
4.3

Troubleshooting

During pump operation, inspect for:
(1) Unusual noise
(2) Product leakage
(3) Expected suction and discharge pressures
(4) Product flow
If any problems are encountered with the above items, stop the pump and take corrective action. For help
with troubleshooting, refer to Appendix 7.
MAG-DRIVE Gear Pumps
Models H1-H9, 31-39 & 311 - MC
13