Tuthill PD Plus 1215 - Soft Foot; Safety

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5.1.4 SOFT FOOT
Soft foot is a condition in which one of the blower feet does
not sit at on the base. Usually, this is due to irregularities in
the surface to which the blower is mounted. When you tighten
the bolt on the foot, the blower will distort slightly, but enough
to cause problems with bearing and seal life, and premature
internal contact between the rotors and the housing.
1. Place blower on base.
2. Check each foot for gaps between foot and base (soft foot),
shim as necessary to ll gap within .002” (.05 mm) Below are
shown the two most common types of soft foot conditions. If
either type is present, and measures more than .003” (.076
mm), the blower may fail prematurely.
3. Tighten all bolts.
4. Mount a dial indicator on base contacting one foot at 12
o’clock position.
5. Loosen bolt on that foot. Observe indicator travel and add
shims as needed to reduce “spring” to less than .002” (.05
mm). Repeat steps 4 and 5 on remaining feet.
5.2 SAFETY
Tuthill Vacuum & Blower Systems recommends the use of relief valves to protect against excessive pressure
or vacuum conditions. These valves should be tested at initial start-up to be sure they are properly adjusted
to relieve at or below the maximum pressure differential rating of the blower.
DANGER
It is the responsibility of the installer to assure that proper guarding is in
place and compliant with all applicable regulatory requirements.
DANGER
Internal and external rotating parts of the blower and driving equipment can
produce serious physical injuries. The blower should never be run with the
inlet or discharge piping removed. If it becomes necessary to inspect the
rotating parts of the blower or to change V-belts, be absolutely sure that all
power to the motor controls has been shut off, the motor controls are locked
out, and properly tagged before proceeding.
DANGER
Assure that properly sized vacuum breaks/relief valves are used on the inlet
side of the blower. Also assure that properly sized pressure relief valves
are used on the outlet of the blower. The sizing shall be such to assure that
the proper ow can be achieved without exceeding the rated vacuum and
pressure ratings.
DANGER
Blower housing and associated piping or accessories may become hot
enough to cause major skin burns on contact.
Figure 4 - Illustrations of Soft Foot
ANGULAR
SOFT FOO
T
P
ARALLEL
SOFT FOO
T