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Maintenance
3-2
c. When the pump is cold, check that the heaters are bolted snugly to the boiler plate and that
all heater terminal connections are tightly fastened inside the junction box.
d. Check the total heater input and balance of load if a multi-phase heater is used.
e. Check to insure that cooling water flow is unobstructed and not below specified quantities.
3-3 CLEANING
Complete cleaning of the pump may be periodically required because of the gradual deterioration of
some pump fluids. Removal of the pump from the system is then necessary.
WARNING
_____________
If hazardous gas, vapors, chemicals, or combustible mixtures are
pumped, sufficient quantities may exist during operation. This pump
may contain decomposed and/or overheated pump oils or poisonous
and/or corrosive process materials which are highly toxic and also can
be an asphyxiant. Proper operation will not always ensure that all haz-
ardous materials have been removed.
Diffusion pumps are typically cleaned with acetone, alcohol, or other
solvents.
When heated, sprayed or exposed to high temperature equipment,
these solvents become flammable and explosive, causing serious injury
or death. Do not use near a high-temperature source. Ventilate work-
ing area with a blower and use in large, well-ventilated room. When
heated or sprayed, solvents also become 4 to 5 times heavier than air
and will flow down, settling in tanks, pits, and low areas, thus displacing
air which can kill by asphyxiation. Use in a large, well-ventilated room.
Use of a self-contained breathing apparatus may be necessary.
Acetone, alcohol, and other solvents are irritants, narcotics, depres-
sants, and/or carcinogenics. Their inhalation and/or ingestion may pro-
duce serious effects. Prolonged or continued contact with the skin will
result in absorption through the skin and moderate toxicity. Always
ensure that cleaning operations are carried out in large, well-ventilated
rooms, and wear eyeshields, gloves, and protective clothing.
WARNING
_____________
Acetone and other solvents degrade O-ring materials reducing their
ability to hold a vacuum. Do not use solvents on O-rings. If necessary to
clean O-rings, wipe with a lint-free, clean cloth or use a small amount of
diffusion pump oil.