OM-03989
RS AND RD SERIES PUMPS
PAGE B - 7
INSTALLATION
If the pump is installed within a closed
building such as a pump house, venting
lines to the outside of the building should
be installed in accordance with National
and local codes.
Bypass Lines (“BAR” Models)
The integral Roto‐Prime
priming pump and Air
Release Valve work in conjunction with three tube
assemblies. One tube assembly draws vapor from
the suction flange of the centrifugal pump to the
suction port of the priming pump. Another assem
bly discharges the vapor to the air release. The
third tube assembly returns any accumulated liq
uid from the bottom of the cylindrical air release
chamber back into the suction flange of the cen
trifugal pump.
ALIGNMENT
The alignment of the pump and its power source is
critical for trouble‐free mechanical operation. In
either a flexible coupling or V‐belt driven system,
the driver and pump must be mounted so that their
shafts are aligned with and parallel to each other. It
is imperative that alignment be checked after the
pump and piping are installed, and before opera
tion.
NOTE
Check
Rotation
, Section C, before final alignment
of the pump.
When mounted at the Gorman‐Rupp factory, driver
and pump are aligned before shipment. Misalign
ment will occur in transit and handling. Pumps
must
be checked and realigned before operation.
Before checking alignment, tighten the foundation
bolts. The pump casing feet and/or pedestal feet,
and the driver mounting bolts should also be tightly
secured.
When checking alignment, disconnect
the power source to ensure that the
pump will remain inoperative.
Adjusting the alignment in one direction
may alter the alignment in another direc
tion. Check each procedure after altering
alignment.
Coupled Drives
When using couplings, the axis of the power
source must be aligned to the axis of the pump
shaft in both the horizontal and vertical planes.
Most couplings require a specific gap or clearance
between the driving and the driven shafts. Refer to
the coupling manufacturer's service literature.
Align spider insert type couplings by using calipers
to measure the dimensions on the circumference
of the outer ends of the coupling hub every 90 de
grees. The coupling is in alignment when the hub
ends are the same distance apart at all points (see
Figure 4).
Figure 4. Aligning Spider‐Type Couplings
Align non‐spider type couplings by using a feeler
gauge or taper gauge between the coupling halves
every 90 degrees. The coupling is in alignment
when the hubs are the same distance apart at all
points (see Figure 5).
Check parallel adjustment by laying a straightedge
across both coupling rims at the top, bottom, and
