Page 176 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

158 Major Process Equipment Maintenance and Repair

roman numerals and alignment arrows. All units are provided with a ro-
tation arrow. Either a sticker or metal arrow attached to the housing indi-
cates the direction of rotation.

Accessories

Stationary inlet vanes or variable inlet vanes (VIV’s) that are shipped
separately should have an arrow indicating rotation of the wheel relative
to the vanes.

Note
Inlet vanes and VIV’s must be installed correctly in relation to the
wheel rotation or fan will not perform. Other items such as coupling
guards, belt guards, crossover or connecting linkages for VIV’s or inlet
box dampers, etc. are tagged or marked with the fan identification num-
ber.

Check Foundations

Check that foundation bolts are located as called for on the assembly
drawing and that the fan mounting holes will mate. For high tempera-
ture operation, provide for fan expansion in the foundation. Determine
with a transit and mark the foundation centerline. This centerline is used
as a reference throughout the erection period. Include the driver and de-
termine shaft centerline height from the concrete or some other reference
point in the foundation or a close-by fixed point.

Set Lower Fan Housing

Lift housing into place. If housing is split, move only the lower half
into position. Do not lift the housing with a fork lift or car loader. When
moving the housing, be sure to clear the foundation bolts. Lower the
housing onto blocks so the base angles clear the foundation bolts. Next,
align the base angle holes with the foundation bolts. Lower the housing
carefully over the foundation bolts, taking care not to damage the
threads. Under the housing put temporary shims appoximately as thick as
the grout will be. Shims (about 4 in. wide) should be flat and flush with
edges of the base angles. The weight of the unit should be carried by at
least one shim on each side of every foundation bolt. Next, attach the
inlet boxes to the housing. These may be bolted to the housing through a
bar iron welded on the edge of the housing or fastened to locating clips on
the housing side with a few bolts and then seal welded to the fan housing.
If a special inlet box support leg is required, attach it now but do not pull