Commissioning, Startup, Operation & Shutdown
236 Series Twin-Screw Pump -
Installation, Operation & Maintenance Manual
53
Establish baseline vibration readings in order to determine normal running conditions. If the
unit is running roughly, then consult the factory.
Monitor all gauges to ensure that the pump is running at or near rating and that the suction
screen (when used) is not clogged
Operation with excessive discharge pressure
WARNING:
Risk of breach of containment and equipment damage. Excessive vibration levels can cause
damage to bearings, gears, seal chamber, and/or mechanical seal. Observe pump for
vibration levels, bearing temperature, and excessive noise. If normal levels are exceeded,
shut down and resolve.
Risk of explosion and serious physical injury. Do not operate pump with blocked system piping
or with suction or discharge valves closed. This can result in rapid heating and vaporization of
pumped fluid.
Risk of equipment damage and serious physical injury. Heat build-up can cause rotating parts
to score or seize. Observe pump for excessive heat build-up. If normal levels are exceeded,
shut down and resolve
NOTICE:
Cavitation can cause damage to the internal surfaces of the pump. Ensure net positive suction
head available (NPSH
A
) always exceeds NPSH required (NPSH
R
) as shown on the published
performance curve or datasheet of the pump
Operation under freezing conditions
NOTICE:
Do not expose an idle pump to freezing conditions. Drain all liquid that is inside the pump and
any auxiliary equipment. Failure to do so can cause liquid to freeze and damage the pump.
Shut down the pump
WARNING:
Precautions must be taken to prevent physical injury. The pump may handle hazardous and/or
toxic fluids. Proper personal protective equipment should be worn. Pumped fluid must be
handled and disposed of in conformance with applicable environmental regulations
1. Shut down and lock out the driver to prevent accidental rotation.
2. Close the suction and discharge valves.
3. Close the seal line valves if fitted
