Gorman-Rupp Pumps 2D-E.50 3P 1467825 and up - Manual (Page 11)

OM−01477 D SERIES
PAGE B − 4 INSTALLATION
ble length of suction hose or piping; lengths of 25
feet (7,6 m) or longer will reduce the capacity of the
pump.
It is strongly recommended that no positive shut-
off valve be installed in the suction line; excessive
restrictions will cause incomplete filling of the dia-
phragm chamber and result in short diaphragm
life.
Fittings
Suction lines should be the same size as the pump
inlet. If reducers are used in suction lines, they
should be the eccentric type, and should be in-
stalled with the flat part of the reducers uppermost
to avoid creating air pockets. The suction line
should not be restricted more than 1 inch below the
nominal suction size.
The use of pipe couplings in the suction line is not
recommended.
Strainers
If a strainer is furnished with the pump, be certain
to use it; any spherical solids which pass through a
strainer furnished with the pump will also pass
through the pump itself.
If a strainer is not furnished with the pump, but is
installed by the pump user, make certain that the
total area of the openings in the strainer is at least
three or four times the cross section of the suction
line, and that the openings will not permit passage
of solids larger than the solids handling capability
of the pump.
This pump is designed to handle up to 1-1/2 inch
(38,1 mm) diameter spherical solids.
Sealing
Since even a slight leak will affect priming, head,
and capacity, especially when operating with a
high suction lift, all connections in the suction line
should be sealed with pipe dope to ensure an air-
tight seal. Follow the sealant manufacturer’s rec-
ommendations when selecting and applying the
pipe dope. The pipe dope should be compatible
with the liquid being pumped.
DISCHARGE LINES
The discharge line must be the same size
as, or larger than, the suction line. Never in-
stall or operate the pump with a discharge
line smaller than the suction; a restricted
discharge line will cause excessive friction
loss resulting in overloading and destruc-
tion of pump and drive components.
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
The pump is provided with integral suction and dis-
charge check valves.
Never install a positive shut-off valve in the
discharge line; discharge restrictions will
cause excessive friction loss resulting in
overloading and destruction of pump and
drive components. It is strongly recom-
mended that unless absolutely necessary,
no positive shut-off valve be installed in the
suction line; excessive restriction will
cause incomplete filling of the diaphragm
chamber and result in shortened dia-
phragm life.
ELECTRICAL CONNECTIONS
Before connecting the motor to the incoming
power, check that the electrical service available