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5-b. FOUNDATION
Fi
. 5-2
1. The foundation should be sufficiently substantial to absorb vibration and form a permanent, rigid
support for the base plate. This is essential for maintaining alignment of a long coupled unit. A
concrete foundation should be satisfactory. Embed foundation bolts of the proper size (1/2" -13 x
7" recommended for ordinary installation) in the concrete, located by a drawing or template. Use a
pipe sleeve larger than the bolt to allow enough base movement for final positioning of the bolts.
2. Support the base plate on rectangular metal blocks and shims, or on metal wedges with a small
taper. Place the support pieces close to the foundation bolts. A spacing of 24" is suggested. Allow
a gap of 3/4" to 1-1/2" between the base plate and the foundation for grouting.
3. Adjust the metal supports or wedges until the shafts of the pump and driver are level. Check the
horizontal or vertical positions of the coupling faces as well as the suction and discharge flanges of
the pump by means of a level. Correct the positions, if necessary, by adjusting the supports or
wedges under the base plate as required.
4. When alignment is correct, tighten foundation bolts evenly but not too firmly. The units can then
be grouted to the foundation. The legs of the base plate should be completely filled with grout and
the leveling pieces, shims, or wedges should be grouted in place. The foundation bolts should not
be tightened until the grout is hardened, usually about 48 hours after pouring.
Never operate the pump without first securing it into position.
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