Xylem Goulds J Series User Manual

11
CHECKING SUCTION LIFT ON A
SHALLOW WELL
A vacuum gauge indicates Total Suction Lift (vertical
lift + friction loss) in inches of mercury (Hg.). One
inch (1") on the gauge = 1.13 feet of total suction lift
(based on a pump at sea level). Practical suction lift at
sea level is 25' or 22" Hg. Deduct 1 ft. for each 1000 ft.
above sea level.
Install the compound vacuum/pressure gauge in the
1
⁄
8
" hole in the shallow well adapter or the
1
⁄
8
" hole be-
tween the suction and discharge pipes on a dedicated
shallow well pump. This is the same hole that is used
to connect an air volume control.
Interpreting the gauge readings:
High Vacuum (22" or more)
• Suction pipe buried in mud
• Foot valve or check valve stuck closed
• Suction lift exceeds lift capability of pump
Low Vacuum or 0 vacuum
• Suction pipe not submerged
• Suction leak (check joints and especially unions)
Gauge needle uctuates rapidly
• Gaseous well
• Air leak in suction line
• Well producing less than pump capacity (throttle a
ball valve in suction line do not exceed 22" Hg.) to
reduce pump capacity
USE OF TAILPIPE ON
DEEP WELL JET PUMPS
If the capacity of a deep well jet pump exceeds the
well production, well drawdown will allow your pump
to break suction and lose prime. This can be over-
come by using a 34' tailpipe between the jet assembly
and the foot valve. Since the capacity of a pump falls
off as the lift is increased your well inow and pump
output will equalize somewhere between the jet and
foot valve. The drawing shows the percentage of
rated capacity you will get at certain points. As in a
normal situation the jet should be set 5' below the
static water level.
DRIVE PIPE
SUCTION PIPE
JET ASSEMBLY
TAIL PIPE
34 FT. WILL PREVENT
BREAKING SUCTION
STATIC LEVEL
100%
33.9' MAXIMUM
DRAW DOWN 0%
10' PIPE 80%
15' PIPE 70%
20' PIPE 57%
25' PIPE 40%
28' PIPE 25%
29' PIPE 17%
Vacuum
Gauge
22.6’
Vertical Lift
Plus Friction
A reading of 20" on a vacuum gauge placed on the
suction side of the pump would tell you that you have
a vacuum or suction lift of 22.6 ft.
20" x 1.13' = 22.6 ft.
TECHNICAL DATA
TECHNICAL DATA
Fig. 8
Fig. 9

Xylem Goulds J Series Specifications

General

Brand	Xylem
Model	Goulds J Series
Category	Water Pump
Language	English