Gorman-Rupp Pumps PAH4A60-6068H 1511893 and up - Manual (Page 11)

PAH SERIES OM-06441
PAGE B - 3 INSTALLATION
the brake and blocking the wheels before attempt­
ing to operate the pump.
If the pump has been mounted on a mov­
able base, do not attempt to operate the
pump unless the unit is level. Be sure
the leveling stands are positioned on a
solid surface, and the wheels are
chocked.
SUCTION AND DISCHARGE PIPING
Pump performance is adversely effected by in­
creased suction lift, discharge elevation, and fric­
tion losses. See the performance curve and oper­
ating range shown on Page E‐1 to be sure your
overall application allows pump to operate within
the safe operation range.
Materials
Either pipe or hose maybe used for suction and
discharge lines; however, the materials must be
compatible with the liquid being pumped. If hose is
used in suction lines, it must be the rigid‐wall, rein­
forced type to prevent collapse under suction. Us­
ing piping couplings in suction lines is not recom­
mended.
Line Configuration
Keep suction and discharge lines as straight as
possible to minimize friction losses. Make mini­
mum use of elbows and fittings, which substan­
tially increase friction loss. If elbows are necessary,
use the long‐radius type to minimize friction loss.
Connections to Pump
Before tightening a connecting flange, align it ex­
actly with the pump port. Never pull a pipe line into
place by tightening the flange bolts and/or cou­
plings.
Lines near the pump must be independently sup­
ported to avoid strain on the pump which could
cause excessive vibration, decreased bearing life,
and increased shaft and seal wear. If hose‐type
lines are used, they should have adequate support
to secure them when filled with liquid and under
pressure.
Gauges
The pump is drilled and tapped for installing dis­
charge pressure and vacuum suction gauges. It is
recommended that gauges be installed to monitor
pump performance. Seal the gauge threads with
pipe dope to ensure an airtight seal. Follow the
sealant manufacturer's recommendations when
selecting and applying the pipe dope. The pipe
dope should be compatible with the liquid being
pumped.
SUCTION LINES
To avoid air pockets which could affect pump prim­
ing, the suction line must be as short and direct as
possible. When operation involves a suction lift, the
line must always slope upward to the pump from
the source of the liquid being pumped; if the line
slopes down to the pump at any point along the
suction run, air pockets will be created.
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.
Strainers
Be certain to use the strainer furnished with the
pump; any spherical solids which pass through the
strainer will also pass through the pump itself.
If a strainer not furnished with the pump 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 3 inch (76,2
mm) diameter spherical solids.