Xylem GSSERVICE R2 Service Manual Submersible Pumps & Jet Pumps - Manual (Page 86)

84
RULE OF THUMB
Practical suction lift at sea
level is 25 ft. Deduct 1 ft. of
suction lift for each 1,000 ft. of
elevation above sea level.
A vacuum gauge indicates total suction lift
(vertical lift + friction loss = total lift) in inches
of mercury. 1" on the gauge = 1.13 ft. of total
suction lift (based on pump located at sea
level).
Shallow Well System
Install vacuum gauge in shallow well adapter.
See opposite page. When pump is running,
the gauge will show no vacuum if the end of
suction pipe is not submerged or there is a
suction leak. If the gauge shows a very high
vacuum (22 inches or more), this indicates that
the end of suction pipe is buried in mud, the
foot valve or check valve is stuck closed or the
suction lift exceeds capability of pump.
High Vacuum (22 inches or more)
• Suction pipe end buried in mud
• Foot valve or check valve stuck closed
• Suction lift exceeds capability of the pump
Low Vacuum (or 0 vacuum)
• Suction pipe not submerged
• Suction leak
CHECKING SUC
TION LIFT