Gorman-Rupp Pumps 81 1/2D3-X1 1P 326949 and up - Manual (Page 13)

80 SERIES OM−00759
OPERATION PAGE C − 1
OPERATION − SECTION C
Review all SAFETY information in Section A.
Follow the instructions on all tags, labels and
decals attached to the pump.
This pump is designed to handle petro-
leum products and other industrial liq-
uids that do not contain large entrained
solids. Do not attempt to pump liquids
which may damage the pump or endan-
ger personnel as a result of pump fail-
ure.
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 pump is self-priming, but the pump should
never be operated unless there is liquid in the
pump casing.
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.
Add liquid to the pump casing when:
1. The pump is being put into service for the
first time.
2. The pump has not been used for a consider-
able length of time.
3. The liquid in the pump casing has evapo-
rated.
Once the pump casing has been filled, the pump
will prime and reprime as necessary.
After filling the pump casing, reinstall
and tighten the fill plug. Do not attempt
to operate the pump unless all connect-
ing piping is securely installed. Other-
wise, liquid in the pump forced out
under pressure could cause injury to
personnel.
To fill the pump, remove the pump casing fill cover
or fill plug in the top of the casing, and add clean
liquid until the casing is filled. Replace the fill cover
or fill plug before operating the pump.
OPERATION
Lines With a Bypass
Since this pump does not have a suction check
valve, the discharge end of the bypass line must be
submerged in order to maintain suction.
Close the throttling valve in the discharge line and
open the shut-off valve in the bypass line so that
the pump will not have to prime against the weight
of the liquid in the discharge line. Start the motor.
When the pump has primed and liquid is flowing
steadily through the bypass line, close the bypass
shut-off valve and open the discharge throttling
valve.
Lines Without a Bypass
Open all valves in the discharge line and start the
power source. Priming is indicated by a positive