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Gorman-Rupp Pumps 62E31-B All serial numbers User Manual

Page 9

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OM−04020

60 SERIES PUMPS

PAGE B − 3

INSTALLATION

Lines near the pump must be independently sup-
ported to avoid strain on the pump which could
cause excessive vibration, decreased bearing life,
and increased shaft and seal wear. If hose-type
lines are used, they should have adequate support
to secure them when filled with liquid and under
pressure.

Gauges

Most pumps are drilled and tapped for installing
discharge pressure and vacuum suction gauges. If
these gauges are desired for pumps that are not
tapped, 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.

Refer to Figure 1 for the recommended configura-
tion of the suction line.

INCORRECT PITCH

VAPOR

POCKETS

INCORRECT LOOPS

RECOMMENDED

NO

POCKETS

PITCH UP TO

SUCTION

WITH NO

LOOPS

VAPOR

POCKETS

Figure 1. Suction Line Configuration

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. Valves are not nor-
mally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pock-
ets.

Refer to Figure 2 for the recommended entrance
conditions using fittings.