SECTION II
OPERATION
During initial installation, the newly installed pump fluid may be subjected to a degassing process. This may result in foreline pressure fluctuations and "bursts". Such fluctuations are considered normal.
2-1 START-UP PROCEDURE
WARNING
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The following conditions increase the risk of explosion:
•any air leaks into the system
•roughing through a hot diffusion pump may cause some hot hydrocar- bon fluids to ignite or explode when exposed to air
•air release or admitting air to a pump with a hot boiler, permit a strong oxidizer to contact the hot pump oil
•high (above 1 micron (.133 Pa)) inlet pressure
•insufficient (or low level of) pump fluid
•operating pump without cooling water circulating to main water cooling coils
•operating pump with water trapped in quick cool coil
•foreign matter in the pumping fluid which changes its viscosity and obstructs flow passages
CAUTION
•Do not turn on the heater without fluid in the pump. This may ruin the heaters and damage the pump.
•Do not
•Do not operate the pump without the foreline baffle. This may cause a greater than normal fluid loss.
•Do not operate the pump for extended periods at an inlet pressure above 1 micron (.133 Pa). High pressure operation may cause exces- sive backstreaming.
•Do not operate the pump heater unless the cooling water is circulat- ing. It will cause the pump and fluid to overheat.
a.Evacuate the diffusion pump by means of the mechanical roughing pump to a pressure level below 0.5 Torr (66.5 Pa). The diffusion pump will not function unless the discharge pressure is less than the tolerable forepressure (approximately 0.5 Torr (66.5 Pa)).
b.Turn on the cooling water supply to the pump body and check that adequate flow is provided by examining the amount of water discharged at the visual drain points.
c.Switch on the power to the diffusion pump heater.