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Do all diffusion pumps have heaters?
I believe all true diffusion pumps have heaters.
I believe all true diffusion pumps have heaters.
See lessWhat are the causes of diffusion pump backstreaming?
High cross-over pressures when transitioning from mechanical pumps to diffusion. Contaminated diffusion pump oil. Poor performance of the holding pump causing high pressures in the diffusion pump. Leaks in the diffusion pump and/or holding pump and associated piping. Poor performance of the backingRead more
High cross-over pressures when transitioning from mechanical pumps to diffusion.
Contaminated diffusion pump oil.
Poor performance of the holding pump causing high pressures in the diffusion pump.
Leaks in the diffusion pump and/or holding pump and associated piping.
Poor performance of the backing pumps causing high pressures
Improper sequencing of the valving
See lessWhat is an acceptable vacuum furnace leak rate?
Typical acceptable vacuum furnace leak rate varies with the application of the furnace or the operations to be performed and/or the materials to be heated. A typical size new furnace would be less than 10 microns per hour for a mechanically pumped furnace. A diffusion pumped pumped furnace mightRead more
Typical acceptable vacuum furnace leak rate varies with the application of the furnace or the operations to be performed and/or the materials to be heated. A typical size new furnace would be less than 10 microns per hour for a mechanically pumped furnace. A diffusion pumped pumped furnace might be less than 5 microns per hour. These rates are for clean, dry and out-gassed conditions.
See lessWhat are the acceptance criteria for a vacuum chamber leak rate test?
The acceptance criteria for a vacuum chamber leak rate test will vary with the application of the vacuum chamber or the operations to be performed in the chamber and/or the materials being placed in the chamber. In the heat treating industry the purpose of vacuum is to reduce the impact of oxygen oRead more
The acceptance criteria for a vacuum chamber leak rate test will vary with the application of the vacuum chamber or the operations to be performed in the chamber and/or the materials being placed in the chamber. In the heat treating industry the purpose of vacuum is to reduce the impact of oxygen on the materials to be heat treated. Typical acceptable leak rate of a new clean, dry cold and out-gassed furnace with mechanical pumps would be less than 10 microns per hour. For a diffusion pumped furnace it would be lower (maybe 5 microns per hour) as the ultimate vacuum capability will be expected to be lower. Pumping becomes more difficult as the pressure is reduced, thus one needs lower leak rates.
See lessWhat is the cause of virtual leaks?
Usually bad design or improper weld procedures.
Usually bad design or improper weld procedures.
See less