Gorman-Rupp Pumps 81 1/2D52-B 1286723 and up - Manual (Page 14)

OM−00790 80 SERIES
OPERATION PAGE C − 2
STARTING
Consult the operations manual furnished with the
power source.
If the pump has been approved for use with petro-
leum products, be sure the pump unit is properly
grounded before operation. See GROUNDING,
Section B.
Rotation
The correct direction of pump rotation is counter-
clockwise when facing the impeller. If the pump is
operated in the wrong direction, the impeller could
become loosened from the shaft and seriously
damage the pump.
Only operate this pump in the direction in-
dicated by the arrow on the pump body
and on the accompanying decal. Other-
wise, the impeller could become loosened
from the shaft and seriously damage the
pump.
Consult the operating manual furnished with the
power source before attempting to start the power
source.
If an electric motor is used to drive the pump, re-
move V-belts, couplings, or otherwise disconnect
the pump from the motor before checking motor
rotation. Operate the motor independently while
observing the direction of the motor shaft, or cool-
ing fan.
If rotation is incorrect on a three-phase motor, have
a qualified electrician interchange any two of the
three phase wires to change direction. If rotation is
incorrect on a single-phase motor, consult the lit-
erature supplied with the motor for specific instruc-
tions.
OPERATION
Lines With a Bypass
Close the discharge throttling valve (if so
equipped) so that the pump will not have to prime
against the weight of the liquid in the discharge
line. Air from the suction line will be discharged
through the bypass line back to the wet well during
the priming cycle. When the pump is fully primed
and liquid is flowing steadily from the bypass line,
open the discharge throttling valve. Liquid will then
continue to circulate through the bypass line while
the pump is in operation.
Lines Without a Bypass
Open all valves in the discharge line and start the
engine. Priming is indicated by a positive reading
on the discharge pressure gauge or by a quieter
operation. The pump may not prime immediately
because the suction line must first fill with liquid. If
the pump fails to prime within five minutes, stop it
and check the suction line for leaks.
After the pump has been primed, partially close the
discharge line throttling valve in order to fill the line
slowly and guard against excessive shock pres-
sure which could damage pipe ends, gaskets,
sprinkler heads, and any other fixtures connected
to the line. When the discharge line is completely
filled, adjust the throttling valve to the required flow
rate.
Leakage
No leakage should be visible at pump mating sur-
faces, or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maxi-
mum pump efficiency.
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is
160
_ F (71_C). Do not apply it at a higher operating
temperature.
Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a