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6.6.1 OPERATION
1. Check oil level in sight glass of blower and assure all fi ttings are tight.
2. Check the water injection system to assure water is available.
3. Operate the blower dry for a few minutes at no load to check correct rotation and smooth operation.
4. Turn water on and adjust fl ow as recommended for the individual blower. Assure water discharges
freely from the outlet piping.
5. Apply vacuum and observe operation at the desired inlet condition.
6.6.2 SHUTDOWN
1. The blower can be shutdown for brief periods by relieving the inlet vacuum, shutting the water off, and
then stopping the unit.
2. Rusting during a slightly longer shutdown period can be avoided by operating the blower under a partial
vacuum without the water injection, allowing the blower to heat within safe limits. The heat will tend to
drive off residual moisture.
3. For extended shutdown, oil may be injected into the inlet of the heated blower just prior to shutting
the blower down. The oil will provide a protective coating on the internals. Insure that the water is
completely shut off after shutdown.
4. Special coatings or platings are available to minimize rusting or corrosion in applications where units
can remain wet.
Vertical fl ow units with two-lobed, plugged rotors should always be used. Always orient system such that
the blower intake is at the top and discharge at the bottom.
CAUTION
Water injection can cause lime build-up on rotors. Check water supply for
hardness. The use of water softeners, other chemicals, or distilled water
may be necessary to prevent or remove this build-up. However, due to the
wide variations in mineral content, pH, and chemical content of water that
can be injected, Tuthill Vacuum & Blower Systems cannot be responsible
for damage which may result should this build-up occur. Units should be
inspected regularly to determine any problems.
NOTE
For liquid injection other than water, consult the factory.
6.7 RECOMMENDED SHUTDOWN PROCEDURE TO MINIMIZE RISK OF FREEZING OR
CORROSION
When high humidity or moisture is present in an air piping system, condensation of water can occur after
the blower is shut down and the blower begins to cool. This creates an environment favorable to corrosion
of the iron internal surfaces, or in cold weather, the formation of ice. Either of these conditions can close the
operating clearances, causing the blower to fail upon future start-up.
The following shutdown procedure outlined below minimizes the risk of moisture condensation, corrosion
and freezing.
NOTE
Care must be taken so as not to overload or overheat the blower during this
procedure.
1. Isolate the blower from the moist system piping, allowing the blower to intake atmospheric air. Operate
the blower under a slight load allowing the blower to heat within safe limits. The heat generated by the
blower will quickly evaporate residual moisture.
