Gorman-Rupp Pumps 112B60-B 758209 and up - Manual (Page 12)

10 SERIES OM-01828
PAGE B - 5 INSTALLATION
A check valve in the discharge line is normally rec­
ommended, but it is not necessary in low dis­
charge head applications.
With high discharge heads, it is recommended that
a throttling valve and a system check valve be in­
stalled in the discharge line to protect the pump
from excessive shock pressure and reverse rota­
tion when it is stopped.
If the application involves a high discharge
head, gradually close the discharge
throttling valve before stopping the pump.
Bypass Lines
Self‐priming pumps are not air compressors. Dur­
ing the priming cycle, air from the suction line must
be vented to atmosphere on the discharge side. If
the discharge line is open, this air will be vented
through the discharge. However, if a check valve
has been installed in the discharge line, the dis­
charge side of the pump must be opened to atmos­
pheric pressure through a bypass line installed be­
tween the pump discharge and the check valve. A
self‐priming centrifugal pump will not prime if
there is sufficient static liquid head to hold the dis­
charge check valve closed.
NOTE
The bypass line should be sized so that it does not
affect pump discharge capacity; however, the by­
pass line should be at least 1 inch (25,4 mm) in di­
ameter to minimize the chance of plugging.
In low discharge head applications (less than 30
feet (9,1 m)), it is recommended that the bypass
line be run back to the wet well, and located 6
inches below the water level or cut‐off point of the
low level pump. In some installations, this bypass
outline may be terminated with a six‐to‐eight foot
(1,8 to 2,4 m) length of 1-1/4 inch (31,8 mm) I.D.
smooth‐bore hose; air and liquid vented during
the priming process will then agitate the hose and
break up any solids, grease, or other substances
likely to cause clogging.
A bypass line that is returned to a wet well
must be secured against being drawn into
the pump suction inlet.
It is also recommended that pipe unions be in­
stalled at each 90
_ elbow in a bypass line to ease
disassembly and maintenance.
In high discharge head applications (more than
30 feet (9,1 m), an excessive amount of liquid may
be bypassed and forced back to the wet well under
the full working pressure of the pump; this will re­
duce overall pumping efficiency. Therefore, it is
recommended that a Gorman‐Rupp Automatic
Air Release Valve be installed in the bypass line.
Gorman‐Rupp Automatic Air Release Valves are
reliable, and require minimum maintenance. Con­
sult your Gorman‐Rupp distributor, or contact the
Gorman‐Rupp Company for selection of an Auto­
matic Air Release Valve to fit your application.
Except in certain specific applications (to
prevent flooding during service of an auto­
matic air release valve in a below‐ground
lift station), if a manual shut‐off valve is in­
stalled anywhere in a bypass line, it must
be a full‐opening, ball‐type valve to pre­
vent plugging by solids.
A manual shut‐off valve should not be
installed in any bypass line. A manual
shut‐off valve may inadvertently be left
closed during operation. A pump which
has lost prime may continue to operate
without reaching prime, causing dan­
gerous overheating and possible explo­
sive rupture of the pump casing. Per­
sonnel could be severely injured.
Allow an over‐heated pump to com­
pletely cool before servicing. Do not re­