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Technical Information
Never operate a large diffusion pump under the conditions listed in the following
table. Any of these situations increases the probability of an explosion.
Table 2
Hazard
Do not run pump without cooling water
Do not run pump with low level of pump fluid
Do not run pump without proper backing or
holding pump
Do not run pump when not evacuated below
0.5 Torr (0.67 mbar)
Do not admit air to, or rough through, a pump
with hot boiler
Do not open drain or fill plug while pump is
under vacuum, especially when it is hot
Do not contaminate pump with explosive vapors Lower explosive threshold of gas mixtures
Do not remove, defeat, or override safety
counter-measures such as pressure and thermal
switches and valve sequencer interlocks
Do not machine or weld any part of the pump
without removing all fluid or solvent residue in
pump
Do not use unsuitable pumping fluid
High Throughput Diffusion Pumps User Manual
Explosive Conditions
Suggested Corrective Action
Overtemperature
Overtemperature
Overpressure
Overpressure
Overpressure plus strong oxidizer
Overpressure plus strong oxidizer
Overtemperature, overpressure, more
combustible mixtures
Source of ignition
Lower explosive threshold of gas mixture
19
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