Gorman-Rupp Pumps VG8D3-B 1221466 and up - Manual (Page 13)

VG SERIES OM-02819
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 liquids
containing specified entrained solids.
Do not attempt to pump volatile, corro­
sive, or flammable liquids which may
damage the pump or endanger person­
nel as a result of pump failure.
Pump speed and operating conditions
must be within the performance range
shown on page E‐1.
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 MAINTENANCE
AND REPAIR).
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 device 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
system 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 this pump unless there is
liquid 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
suction line and pump casing. To prime a pump
with a hand vacuum pump, open the cock on the
pump priming line. Operate the hand pump until
liquid flows out of the check valve on the bottom of
the primer pump. Once the pump is primed, close
the valve located between the primer and the
pump so that the prime will not be lost.
DRAIN
COCK
HANDLE
Figure 1. Hand Primer Assembly
Exhaust Primers
Engine driven pumps normally take advantage of
the engine exhaust gases by using them to operate
an exhaust primer. The exhaust is directed through