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foundation having a mass ≥ 1.5 times the weight
of the unit.
The
foundation
should
interruption to within 1/2 to 1-1/2 inches of the
finished height. The top surface of the foundation
should be well scored and grooved before the
concrete sets; this provides a bonding surface for
the grout.
Foundation bolts should be set in concrete as
shown in Figure 4. An optional 4-inch long tube
around the bolts at the top of the concrete will
allow some flexibility in bolt alignment 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.
Figure 4:
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
recommendations. A-C Pump cannot assume
responsibility for final alignment.
be
poured
without
Foundation
Figure 5:
Setting Base Plate and Grouting
a. Use blocks and shims under base for
support at anchor bolts and midway
between
approximately 1 inch 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.
c. Draw anchor nuts tight against base, and
observe pump and motor shafts or
coupling hubs for alignment. (Temporarily
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 agreed upon by pump contractor
and the accepting facility (final operator). Final
alignment procedures are covered in the section
entitled Alignment Procedure.
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 and allow
grout to dry thoroughly before attaching
piping to pump. See the section entitled
Grouting Procedure. 24 hours is sufficient
time with approved grouting procedure.
GROUTING PROCEDURE
Grout
compensates
distributes weight of unit, and prevents shifting.
Use an approved, non-shrinking grout, after
setting and leveling unit. See Figure 5.
a. Build strong form around the foundation to
contain grout.
b. Soak
top
thoroughly, then remove surface water.
c. Base plate should be completely filled with
grout.
d. After the grout has thoroughly hardened,
check the foundation bolts and tighten if
necessary.
6
bolts,
to
position
for
uneven
foundation,
of
concrete
foundation
base
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