Gorman-Rupp Pumps RD2A31-BAR All serial numbers - Manual (Page 10)

RS AND RD SERIES PUMPS OM-03989
PAGE B - 4 INSTALLATION
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. Valves are not nor­
mally used in suction lines, but if a valve is used,
install it with the stem horizontal to avoid air pock­
ets.
Refer to Figure 2 for the recommended entrance
conditions using fittings.
POOR ENTRANCE CONDITIONS
RECOMMENDED ENTRANCE CONDITIONS
CHECK
VALVE
REDUCER HORIZONTAL
ELBOW
GATE
VALVE
3 TO 4 DIA'S OF
STRAIGHT PIPE
ECCENTRIC
REDUCER
3 TO 4 DIA'S OF
STRAIGHT PIPE
GATE
VALVE
HORIZONTAL
ELBOW
Figure 2. Entrance Conditions Using Fittings
Strainers
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 discharge piping, carefully
check the storage tank and piping for con­
struction debris such as nuts, bolts, wire,
weld slag, and other foreign material. In­
stall a commercially available 80 mesh
screen and a filter in the suction line to pre­
vent debris from entering the pump.
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.