25
NOTES
1) CENTERLINE OF PUMP SUCTION (INLET) TO BE
SLIGHTLY HIGHER THAN CENTERLINE OF SUCTION
(INLET) VALVE, SO ANY AIR IN SUCTION SYSTEM
PROMPTLY REACHES THE PUMP AND IS EXPELLED.
2) SLOPE BYPASS SO LOW POINT DRAIN WILL FULLY
EMPTY RELIEF AND CHOKE VALVES AND ALL
LIQUID IN BYPASS CIRCUIT.
3) DO NOT LOCATE PIPING OR OTHER EQUIPMENT
IN FRONT OF OR ABOVE PUMP LIQUID END,
PREVENTING SERVICING.
4) LOCATE CHARGING PUMP AT POINT SHOWN IF A
CHARGING PUMP IS NECESSARY (AS FOR VOLATILE
FLUIDS, FOR EXAMPLE).
5) IF DESIRED, A TWO-WAY MOTOR-OPERATED BYPASS
VALVE MAY BE USED RATHER THAN A MANUAL
TYPE. IT SHOULD BE DESIGNED TO OPEN
AUTOMATICALLY WHILE STARTING OR STOPPING.
6) FEED LINE AND BYPASS LINE SHOULD FEED
LIQUID INTO TANK BELOW MINIMUM LIQUID LEVEL.
LIQUID
SUPPLY
TANK
SUGGESTED PIPING SYSTEM FOR PLUNGER PUMPS
BYPASS LINE
FULL-OPENING SUCTION (INLET) LINE VALVE
LOW POINT DRAIN VALVE
(SEE NOTE 2)
FLEXIBLE HOSE OR EXPANSION
JOINT (SEE NOTE 7)
NEEDLE OR HARD-TRIMMED CHOKE BYPASS VALVE OPEN TO
EXPEL AIR IN PUMP PRIOR TO LOADING (SEE NOTE 5)
FULL-OPENING RELIEF VALVE OR BURST-DISC
VALVE OPENS FULLY WHEN SET PRESSURE IS
REACHED
HORIZONTAL PLUNGER PUMP WITH
DUAL SUCTION AND DUAL DISCHARGE
CONNECTIONS (DRIVER AND
FOUNDATIONS NOT SHOWN)
PRESSURE GAUGE AND BLOCK VALVE
DISCHARGE PULSATION
DAMPENER (IF USED)
SUCTION PULSATION
DAMPENER (IF USED)
DISCHARGE LINE
(SEE NOTE 7)
FULL-OPENING DISCHARGE LINE VALVE
SWING CHECK VALVE WITH FULL-OPENING SEAT
PRESSURE RELIEF VALVE AND
COLD WEATHER DRAIN
(SEE NOTE 9)
CENTERLINE OF PUMP SUCTION (INLET)
(SEE NOTE 1)
ECCENTRIC REDUCER WITH
FLAT SIDE UP
PRESSURE GAUGE
AND BLOCK VALVE
FLEXIBLE HOSE OR
EXPANSION JOINT
(SEE NOTE 7)
SUCTION (INLET) LINE. SEPARATE
LINE REQUIREDFOR EACH PUMP
IF MULTIPLE PUMPING UNITS ARE
USED. SIZE OF LINE DEPENDS ON
ACCELERATION HEAD FACTOR
BUT MUST AT LEAST EQUAL PUMP
SUCTION CONNECTION SIZE.
(MINIMUM)
SEE NOTE 4
VORTEX SPLITTER
AND SUPPORT
SUCTION BELL. DESIGNED FOR LOW
LIQUID ENTRY VELOCITY (MAY INCLUDE
FOOT VALVE IF DESIRABLE)
COMPLETELY SUBMERGED BAFFLE
PLATE SEPARATING INCOMING
FROM OUTGOING LIQUID
MANHOLE
MINIMUM
LIQUID
LEVEL
FEED LINE
(SEE NOTE 6)
7) TO REMOVE PIPING STRAIN AND VIBRATION, A
FLEXIBLE HOSE, EXPANSION JOINT, OR SWIVEL
JOINT PAIR SHOULD BE POSITIONED TO
MINIMIZE EFFECTS OF PIPING THERMAL
EXPANSION, CONTRACTION AND PIPING WEIGHT.
8) SUCTION AND DISCHARGE PIPING MUST BE
SUPPORTED AND ANCHORED.
9) TO PROTECT SUCTION SYSTEM AGAINST
HAZARD OF DISCHARGE PRESSURE ENTRY (AS
WHEN PUMP IS IDLE) A SMALL RELIEF VALVE
IS OFTEN CONNECTED HERE.
10) ALL SYSTEM CONPONENTS MUST HAVE ADEQUATE
PRESSURE RATINGS FOR OPERATING, STARTING,
AND UPSET CONDITIONS IN ORDER TO REDUCE
POTENTIAL HAZARDS, PARTICULAR ATTENTION
IS RECOMMENDED FOR THE SURGE CONDITION
THAT WILL RESULT DOWNSTREAM OF THE RELIEF
VALVE WHEN NORMAL DISCHARGE IS BLOCKED.
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