Bell & Gossett P81875G Series HSC-S Centrifugal Pump - Manual (Page 6)

6
Foundation bolts should be set in concrete as shown in
Illustration 4. An optional 4-inch long tube around the bolts at
the top of the concrete will allow some flexibility in bolt align-
ment to match the holes in the base plate. Allow enough bolt
length for grout, shims, lower base plate flange, nuts and
washers. The foundation should be allowed to cure for several
days before the base plate is shimmed and grouted.
9. Base Plate Setting (Before Piping)
NOTE: This procedure assumes that a concrete foundation
has been prepared with anchor or hold down bolts extending
up ready to receive unit. It must be understood that pump and
motor have been mounted and rough aligned at the factory. If
motor is to be field mounted, consult factory for recommenda-
tions. Bell & Gossett cannot assume responsibility for final
alignment.
a. Use blocks and shims under base for support at anchor
bolts and midway between bolts, to position base
approximately 1" above the concrete foundation, with studs
extending through holes in the base plate.
b. By adding or removing shims under the base, level and
plumb the pump shaft and flanges. The base plate does not
have to be level.
c. Draw anchor nuts tight against base, and observe pump
and motor shafts or coupling hubs for alignment. (Tem-
porarily remove coupling guard for checking alignment.)
d. If alignment needs improvement, add shims or wedges at
appropriate positions under base, so that retightening of
anchor nuts will shift shafts into closer alignment. Repeat
this procedure until a reasonable alignment is reached.
NOTE: Reasonable alignment is defined as that which is
mutually agree upon by pump contractor and the accepting
facility (final operator). Final alignment procedures are cov-
ered under “Alignment Procedures.”
e. Check to make sure the piping can be aligned to the pump
flanges without placing pipe strain on either flange.
f. Grout in base plate completely (See “Grouting Procedure”)
and allow grout to dry thoroughly before attaching piping to
pump. (24 hours is sufficient time with approved grouting
procedure.)
10. Grouting Procedure
Grout compensates for uneven foundation, distributes weight
of unit, and prevents shifting. Use an approved, non-shrinking
grout, after setting and leveling unit (See Illustration 5).
a. Build strong form around the foundation to contain grout.
b. Soak top of concrete foundation thoroughly, then remove
surface water.
c. Base plate should be completely filled with grout.
d. After the grout has thoroughly hardened, check the founda-
tion bolts and tighten if necessary.
e. Check the alignment after the foundation bolts are
tightened.
f. Approximately 14 days after the grout has been poured or
when the grout has thoroughly dried, apply an oil base paint
to the exposed edges of the grout to prevent air and mois-
ture from coming in contact with the grout.
11. See ANSI/OSHA Coupler Guard Removal/Installation
(next page)
12. Alignment Procedure
NOTE: A flexible coupling will only compensate for small
amounts of misalignment. Permissible misalignment will vary
with the make of coupling. Consult coupling manufacturer’s
data when in doubt.
Allowances are to be made for thermal expansion during cold
alignment, so that the coupling will be aligned at operating
temperature. In all cases, a coupling must be in alignment for
continuous operation. Even though the coupling may be lubri-
cated, misalignment causes excessive wear, vibration, and
bearing loads that result in premature bearing failure and
ultimate seizing of the pump. Misalignment can be angular,
parallel, or a combination of these, and in the horizontal and
vertical planes. Final alignment should be made by moving
and shimming the motor on the base plate, until the coupling
hubs are within the recommended tolerances measured in
total run-out. All measurements should be taken with the
pump and motor foot bolts tightened. The shaft of sleeve
bearing motors should be in the center of its mechanical float.
NOTE: Proper alignment is essential for correct pump opera-
tion. This should be performed after base plate has been
properly set and grout has dried thoroughly according to
instructions. Final alignment should be made by shimming
driver only. Alignment should be made at operating
temperatures.
Illustration 4 – Foundation
Illustration 5 – Setting Base Plate and Grouting
WARNING: Unexpected Start-up Hazard
Disconnect and lock out power before servicing.
Failure to follow these instructions could result in serious
personal injury or death and property damage.
PIPE
SLEEVE
FOUNDATION
BOLT
BUILT-UP
CONCRETE FOUNDATION
GROUT ONLY TO
TOP OF BASE RAIL.
PUMP
BASE RAIL
APPROX.
1" GAP
CONCRETE
FOUNDATION
LEVELING OF PUMP BASE
ON CONCRETE FOUNDATION.
GROUT
WASHER
ALLOW 1" FOR SHIMS.
PLACE ON BOTH SIDES
OF ANCHOR BOLTS.
NOTE:
TO KEEP SHIMS IN
PLACE ALLOW GROUT
TO FLOW AROUND
HOLD DOWN LUGS.
(OPTIONAL)