Gorman-Rupp Pumps VGH5B31-B 1379872 thru 1211802 - Manual (Page 14)

VGH SERIES OM−06128
OPERATION PAGE C − 1
OPERATION − SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and de-
cals attached to the pump.
This pump is designed to handle most
non-volatile, non-flammable liquids
containing specified entrained solids.
Only the Gorman-Rupp Company or an
authorized Gorman-Rupp distributor
may modify a pump or approve its use
for handling volatile, flammable liquids.
If the pump is used for handling volatile,
flammable liquids, all drivers and/or
controls must meet industry standards
and codes for use in an explosive atmo-
sphere. Do not attempt to pump liquids
for which the pump, driver and/or con-
trols have not been approved, or which
may damage the pump or endanger per-
sonnel as a result of pump failure.
If this pump has been approved for use
with volatile and/or flammable liquids,
be certain proper safety practices are
followed before operating or servicing
the pump. Provide adequate ventilation,
prohibit smoking, wear static-resistant
clothing and shoes. Clean up all fuel
spills immediately after occurrence.
Pump speed and operating conditions
must be within the performance range
shown on the curve in Parts Lists manual.
PRIMING
Install the pump and piping as described in IN-
STALLATION. Make sure that the piping connec-
tions are tight, and that the pump is securely
mounted. Check that the pump is properly lubri-
cated (see LUBRICATION in the MAINTENANCE
AND REPAIR manual).
This is not a self-priming pump, so an external
priming device must be used if the pump is in-
stalled on a suction lift. A foot valve may be in-
stalled at the end of the suction pipe to maintain the
prime; however, this may adversely affect pump
performance due to friction loss. Many standard
centrifugal models are equipped with a hand-oper-
ated vacuum pump, exhaust primer, or ejector for
this purpose. If a priming device was not furnished
with the pump, it may be ordered from the factory
as an option.
Before attempting to operate the priming device,
close the discharge throttling valve. (Installation of
a spring-loaded check valve is also recommended
to facilitate priming.) Once the pump is fully
primed, close the valve between the priming de-
vice and pump to preserve the prime.
Start the pump and open the discharge valve
slowly to fill the discharge line. When installed in a
flooded suction application, simply open the sys-
tem valves and permit the incoming liquid to
evacuate the air. After the pump and piping system
have completely filled, evacuate any remaining air
pockets in the pump or suction line.
Never operate the pump unless there is liq-
uid in the pump casing. The pump will not
prime when dry. Extended operation of a
dry pump will destroy the seal assembly.
Hand Primers
Hand-operated primers are usually mounted on
the pump and, when operated, draw air out of the