Gorman-Rupp Pumps T8A60S-F6L 1278434 thru 1318430 - Manual (Page 23)

OM−05517 SUPER T SERIES
OPERATION PAGE C − 6
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is
160
_ F (71_ C). Do not apply it at a higher operat-
ing 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
boil, build pressure, and cause the pump to rup-
ture or explode. If overheating occurs, stop the
pump and allow it to cool before servicing it. Refill
the pump casing with cool liquid.
Allow an over-heated pump to cool be-
fore servicing
. Do not remove plates,
covers, gauges, or fittings from an over-
heated pump. Liquid within the pump
can reach boiling temperatures, and va-
por pressure within the pump can cause
parts being disengaged to be ejected
with great force. After the pump cools,
drain the liquid from the pump by re-
moving the casing drain plug. Use cau-
tion when removing the plug to prevent
injury to personnel from hot liquid.
As a safeguard against rupture or explosion due to
heat, this pump is equipped with a pressure relief
valve which will open if vapor pressure within the
pump casing reaches a critical point. If over-heat-
ing does occur, stop the pump immediately and al-
low it to cool before servicing it. Approach any
over-heated pump cautiously. It is recom-
mended that the pressure relief valve assembly be
replaced at each overhaul, or any time the pump
casing over-heats and activates the valve. Never
replace this valve with a substitute which has not
been specified or provided by the Gorman-Rupp
Company.
Strainer Check
If a suction strainer has been shipped with the
pump or installed by the user, check the strainer
regularly, and clean it as necessary. The strainer
should also be checked if pump flow rate begins to
drop. If a vacuum suction gauge has been in-
stalled, monitor and record the readings regularly
to detect strainer blockage.
Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely neces-
sary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve.
Pump Vacuum Check
With the pump inoperative, install a vacuum gauge
in the system, using pipe dope on the threads.
Block the suction line and start the pump. At oper-
ating speed the pump should pull a vacuum of 20
inches (508 mm) or more of mercury. If it does not,
check for air leaks in the seal, gasket, or discharge
valve.
Open the suction line, and read the vacuum gauge
with the pump primed and at operation speed.
Shut off the pump. The vacuum gauge reading will
immediately drop proportionate to static suction
lift, and should then stabilize. If the vacuum reading
falls off rapidly after stabilization, an air leak exists.
Before checking for the source of the leak, check
the point of installation of the vacuum gauge.
STOPPING
Manual Stopping
In the manual mode, reduce the throttle speed
slowly, and allow the engine to idle briefly before
switching the HAND-OFF-AUTO switch to ‘OFF’.
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
After stopping the pump, close and lock the control
panel cover, or disconnect the positive battery
cable to ensure that the pump will remain inopera-
tive.