GHA SERIES
OM--04621
PAGE B--5
INSTALLATION
Pumps equipped with dual mechanical seals re-
quire the barrier liquid to be supplied at a continu-
ous pressure equivalent to the maximum dis-
charge pressure in order to avoid inboard seal face
separation. The maximum barrier liquid pressure
that can be applied depends primarily on the maxi-
mum seal design pressure (consult the factory).
Do not
pressurize tandem seals. Pressurizing a
tandem seal will cause the seal faces to separate,
resulting in leakage and/or damage to the seal.
Refer to the appropriate section in
Seal Appendix,
Section F
for your specific seal option for operating
instructions for the barrier liquid reservoir kit.
ALIGNMENT
Make certain that power to the drive unit
is disconnected before attempting to
connect the pump drive; otherwise, per-
sonal injury may result.
NOTE
See
ROTATION
in Section C before mounting the
pump on the base.
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
_
.
The coupling is in alignment when the hub ends
are the same distance apart at all points (see Fig-
ure B-2).
Figure B-2. Spider-type Couplings
Align non-spider type couplings by using a feeler
gauge or taper gauge between the coupling halves
every 90
_
. The coupling is in alignment when the
hubs are the same distance apart at all points (see
Figure B-3).
Figure B-3
.
Aligning Non-Spider Type Coupling
Check parallel adjustment by laying a straightedge
across both coupling rims at the top, bottom, and
side. When the straightedge rests evenly on both
halves of the coupling, the coupling is in horizontal
parallel alignment. If the coupling is misaligned,
use a feeler gauge between the coupling and the
straightedge to measure the amount of misalign-
ment.
V-Belt Drives
When using V-belt drives, the power source and
the pump must be parallel. Use a straightedge
along the sides of the pulleys to ensure that they
are properly aligned (see Figure B-4). In drive sys-
tems using two or more belts, make certain that the
belts are a matched set; unmatched sets will cause
accelerated belt wear.
