Page 187 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Positive Displacement and Dynamic Blowers 169

of installation. Wire is placed through the insulation clip (the normal
length of wire is about 24 in.) and bent together. Holes are punched in
block-type insulation and the insulation placed over the extended wires.
Ends of the wires are bent to hold the insulation against the fan.
Consider future disassembly when applying insulation. Do not run
blocks across the housing splits. In addition to preventing heat loss, insu-
lation protects operating personnel against burns.
When specified, insulated access doors are provided that have outside
surfaces flush with the applied insulation.

Startup
Before startup, perform the checklist procedures outlined in the appli-
cable operating and maintenance manual. Compare with other startup
checklists given in Chapter 1 of this Volume and other applicable check-
lists in Volume 3 of this series.

Preventive Maintenance
To ensure trouble-free operation and long life expectancy, a schedule of
preventive maintenance and lubrication must be set up. Frequency of in-
spection and lubrication depends upon operating condition and the
amount of fan use. Daily inspections are recommended after the fan is
first erected. Recommended periodic inspection procedures are listed in
Table 4-1.

Fan Balancing
All heavy duty fans and blower wheels are balanced both statically and
dynamically at the factory (Figure 4-20). A very elementary method of
checking rotor balance is shown in Figure 4-20. If the wheels have not
been damaged or repaired, no additional balancing should be required.