Gorman-Rupp Pumps 06D17-GAR 708768 thru 1000782 - Manual (Page 13)

OM−01274 0 SERIES
PAGE B − 6 INSTALLATION
Piping
All piping material must be compatible with the liq-
uid being pumped. If hose is used in suction lines,
it must be the rigid-wall, reinforced type to prevent
collapse under suction. Using piping couplings in
suction lines is not recommended.
A suction strainer was not furnished with this pump
since it is not designed to handle liquids containing
solids. However, to protect the pump from acciden-
tal damage a commercially available 80 mesh
screen should be installed in the suction line. Make
certain that the total open area of the screen is at
least three or four times the cross section of the
suction line to ensure an adequate supply of liquid
to the pump.
Damage to the pump resulting from debris
in the suction line will not be covered by
the pump warranty.
Before connecting the suction and dis-
charge piping, carefully check the storage
tank and piping for construction debris
such as nuts, bolts, wire, weld slag, and
other foreign material. Install a commer-
cially available 80 mesh screen in the suc-
tion line to prevent debris from entering the
pump.
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.
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
pie dope.
Valves
Gorman-Rupp manufactures several sizes of flow-
diverting (FDF) valves for use in truck-mounted
pumping applications. The valves are designed to
reverse the flow of liquid with only the turn of a han-
dle. This allows the same pump to fill or dispense
from the tank.
The FDF valve is designed for directing
flow only. it will not serve as a positive shut-
off or throttling valve.
See Figure 5 illustrating the theory of operation for
a typical FDF valve. Consult the factory for further
assistance or other sizes.