Gorman-Rupp Pumps 4D-X3 1P - Manual (Page 10)

OM--01515 D SERIES
PAGE B -- 4 INSTALLATION
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 2-1/4 inch
(57 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.
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.
ALIGNMENT
Before attempting to open or service the
pump:
1. Familiarize yourself with this man-
ual.
2. Shut off incoming power to the mo-
tor and lock it out to ensure that the
pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Close the discharge valve (if
used).
5. Drain the pump.
It is imperative that alignment be checked
before the pump is operated.
The pump and motor were aligned and secured at
the factory, but fastening hardware may have loos-
ened during shipment. It is imperative that this
hardware and the alignment be checked after the
pump is installed and
before operation. Adjust-
ments may be made by loosening the securing
hardware and shifting or shimming components
as required.
To check coupling alignment, use a feeler gauge or
taper gauge between the coupling halves every