Gorman-Rupp Pumps 62E31-B All serial numbers - Manual (Page 10)

60 SERIES PUMPS OM−04020
PAGE B − 4 INSTALLATION
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. Do not use excessive amounts of com-
pound at the suction and discharge flanges since it
can enter the pump during initial startup and cause
difficulty in priming. Use the compound sparingly.
The pipe dope should be compatible with the liquid
being pumped.
Suction Lines In Sumps
If a single suction line is installed in a sump, it
should be positioned away from the wall of the
sump at a distance equal to 1 1/2 times the diame-
ter of the suction line.
If there is a liquid flow from an open pipe into the
sump, the flow should be kept away from the suc-
tion inlet because the inflow will carry air down into
the sump, and air entering the suction line will re-
duce pump efficiency.