Gorman-Rupp Pumps 16D60-F3L 1270259 thru 1318306 - Manual (Page 12)

10 SERIES OM--05534
PAGE B -- 5 INSTALLATION
DISCHARGE LINES
Siphoning
Do not terminate the discharge line at a level lower
than that of the liquid being pumped unless a si-
phon breaker is used in the line. Otherwise, a si-
phoning action causing damage to the pump
could result.
Valves
A check valve in the discharge line is normally rec-
ommended, but it is not necessary in low dis-
charge head applications.
If a throttling valve is desired in the discharge line,
use a valve as large as the largest pipe to minimize
friction losses. Never install a throttling valve in a
suction line.
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 meters), it is recommended that the bypass
line be run back to the wet well, and located 6
inches (152,4 mm) 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 length (1,8 to 2,4 m) 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 or 9 meters), 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 reduce overall pumping efficiency.
Therefore,
it is recommended that a Gorman-Rupp Auto-
matic Air Release Valve be installed in the by-
pass line.
Gorman-Rupp Automatic Air Release Valves are
reliable, and require minimum maintenance. See
Automatic Air Release Valves in this section for
installation and theory of operation of the Auto-
matic Air Release Valve. Consult your Gorman-
Rupp distributor, or contact the Gorman-Rupp
Company for selection of an Automatic Air Release
Valve to fit your application.
If a manual shut-off valve is installed in a
bypass line, it must not be left closed
during operation. A closed manual shut-