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Gorman-Rupp Pumps 4D-X3 1P User Manual

Page 9

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D SERIES

OM--01515

PAGE B -- 3

INSTALLATION

AIR CHAMBERS

(18 TO 24 INCH LENGTHS OF

6 TO 8 INCH DIAMETER PIPE

WITH WELDED CAPS)

DISCHARGE

CHAMBER

DISCHARGE

FLEXIBLE JOINT

FLEXIBLE JOINT

SUCTION

CHAMBER

1/2-INCH VALVE FOR

RECHARGING AIR

CHAMBER WITH

COMPRESSED AIR

(ALSO ON DISCHARGE

CHAMBER)

SUCTION

NOTE: INSTALL AIR CHAMBERS OFF FLOW LINE TEES

TO AVOID SURFACE TURBULENCE WITHIN CHAMBERS.

Figure 2. Fixed Piping Installation

Note that the air chambers have not been installed
directly in the flow line, but have been installed off
tees to avoid turbulence within the chambers. The
air chambers are fitted with valves to permit intro-
duction of small amounts of compressed air to fur-
ther dampen shock; this compressed air will leak
away during operation, and should be replaced
from time to time. If the suction chamber floods,
open the suction chamber valve to break prime
and allow the liquid in chamber to drain through
the suction line.

Gauges

If discharge pressure and vacuum suction gauges
are desired, drill and tap the suction and discharge
lines not less than 18 inches (457,2 mm) from the
suction and discharge ports and install the lines.
Installation closer to the pump may result in erratic
readings.

SUCTION LINES

To avoid air pockets which could affect pump prim-
ing, the suction line must be as short and direct as
possible. When operation involves a suction lift, the
line must always slope upward to the pump from

the source of the liquid being pumped; if the line
slopes down to the pump at any point along the
suction run, air pockets will be created.

NOTE

Maximum pump performance is realized at suction
lifts of 5 feet (1,5 m) or less. Use the shortest possi-
ble length of suction hose or piping; lengths of 25
feet (7,6 m) or longer will reduce the capacity of the
pump.

It is strongly recommended that no positive shut-
off valve be installed in the suction line; excessive
restrictions will cause incomplete filling of the dia-
phragm chamber and result in short diaphragm
life.

Fittings

Suction lines should be the same size as the pump
inlet. If reducers are used in suction lines, they
should be the eccentric type, and should be in-
stalled with the flat part of the reducers uppermost
to avoid creating air pockets. The suction line
should not be restricted more than 1 inch below the
nominal suction size.