Goulds Pumps 3996 Installation, Operation And Maintenance Instructions page 29

1. Make sure suction valve and any recirculation or
cooling lines are open.
2. Fully close or partially open discharge valve as
dictated by system conditions.
3. Start Driver.
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A
CAUTION
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Immediately observe pressure gauges. If discharge
pressure is not quickly attained - stop driver, reprime
and attempt to restart.
GENERAL CONSIDERATIONS
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! CAUTION
Always vary capacity with regulating valve in the
discharge line. NEVER throttle flow from the suction
side.
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A
! CAUTION
Driver may overload if the pumpage specific gravity
(density) is greater than originally assumed, or the
rated flow rate is exceeded.
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! CAUTION
Always operate the pump at or near the rated
conditions to prevent damage resulting from
cavitation or recirculation.
3996 IOM 9/2010
STARTING PUMP
4.
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Observe pump for vibration levels, bearing
temperature and excessive noise. If normal levels are
exceeded, shut down and resolve.
OPERATION
OPERATING AT REDUCED
CAPACITY
DO NOT operate pump below minimum rated flows
or with suction and/or discharge valve closed. These
conditions may create an explosive hazard due to
vaporization of pumpage and can quickly lead to
pump failure and physical injury.
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Damage occurs from:
1. Increased vibration levels - Affects bearings,
2. Increased radial loads - Stresses on shaft and
3. Heat build up - Vaporization causing rotating parts to
4. Cavitation - Damage to internal surfaces of pump.
OPERATING UNDER FREEZING
CONDITIONS
Exposure to freezing conditions, while pump is idle,
could cause liquid to freeze and damage the pump.
Liquid inside pump should be drained. Liquid inside
cooling coils, if supplied, should also be drained.
Slowly open discharge valve until the desired flow
is obtained.
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CAUTION
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s
! WARNING
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! CAUTION
stuffing box or seal chamber, and mechanical seal.
bearings.
score or seize.
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