ME Pumps.
7
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For best results all horizontal suction lines should follow an
even gradient. In suction lift conditions the gradient should be
a gradual slope upward. For positive suction head, the
gradient should be a gradual downward slope.
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In order to avoid air pockets that can throttle the system or
cause erratic pumping, high points, such a pipe loops, should
be avoided.
•
In order to shut down the pump for maintenance or removal,
a valve should be installed in the suction line. If more than
one pump is on the same suction line, multiple values should
be placed in the line in order to shut down each pump
individually.
•
Gate valves should always be installed in positions that
avoid air pockets. Globe valves should not be used.
•
Valves along the suction line should always be fully open
when the pump is in operation..
•
Pressure gauges may be installed in gauge taps on pump
nozzles (suction and discharge) if they are the correct size.
T h e s e gauges w i l l monitor the pump’s performance,
helping to determine if the p e r f o r m a n c e o f t h e pump
lies within the parameters of the performance curve. When
unstable operation conditions occur, t h e s e pressure
gauges will indicate t h e wide fluctuation in pressure.