Technical data
. . .
OPERATION
GENERAL CONSIDERATIONS
Always vary capacity with regulating valve in the
discharge line. NEVER throttle flow from the suction
side.
Driver may overload if the pumpage specific gravity
(density) is greater than originally assumed, or the
rated flow rate is exceeded.
Always operate the pump at or near the rated
conditions to prevent damage resulting from
cavitation or recirculation.
OPERATING AT REDUCED CAPACITY
DO NOToperate pump below minimum rated
flows or with suction antior discharge va/ve
closed. These conditions may create an
explosive hazard due to vaporization of
pumpage and can quickly lead to pump failure
and physical injury.
Reference Appendix ill.
Damage occurs from:
1.
Increased vibration levels - Affects bearings, stuffing
box (or seal chamber), and mechanical seal.
2. Increased radial thrusts - Stresses on shaft and
bearings.
3. Heat build up - Vaporization causing rotating parts
to score or seize.
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.
SHUTDOWN
1. Slowly close discharge valve.
2.
Shut down and lock driver to prevent accidental
rotation.
When handling hazardous arxVor to& fluids,
properpersonaip&ective equipment should be
wom. lfpump is being drained, p@cautions must
.
be taken to prevent physical injury. Pumpage
must be handled and disposed of in conformance
with applicable environmental regu/ation.
FINAL ALIGNMENT
1. Run the unit under actual operating conditions for a
2. Check alignment while unit is still hot per alignment
sufficient length of time to bring the pump and
procedure in Section 3.
driver up to operating temperature.
3. Reinstall coupling guard. Refer to coupling guard
instruction in Appendix II.
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y. , x r:-2
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