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VACUUM SYSTEMS
Concepts you should know!
Pumping a Vacuum System
Pumping a vacuum system comes in 3 phases:
1) Pumping the volume
2) Pumping the surface
3) Pumping the gases
Pump down time
The time it takes to pump down a vacuum with two different types of pressures P1, P2 and pumping speed (Sp) is
t= ((2.3 V)/ Sp ) * log ( P1/P2)
where t = time in seconds, V= volume in liters, S = average pumping speed lit/s, Pi = initial pressure, Pj = final pressure
Assumptions made when it comes to vacuums:
1) The pumping speed does not deviate significantly from its average value ( Constant pumping speed)
2) The final pressure P2, is above the system base pressure by at least 1 decade.
Pumping speeds for most pumps are given in terms of N2. For other gases the rates of the molecular weights must be taken into account.
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Oil Diffusion Pump
Diffusion Pump operation
The Pump consists of pump body, the gas molecules are heated from the heater. As the oil molecules turn into vapor they begin to move through the pump based on the momentum transfer from the high speed vapor molecules to the gas molecules.
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Molecular Drag Pump
Principles
An impeller directs the molecules towards the drag pump for improving pumping speed. The molecules are captured by the impeller. They are driven by the movement of the rotor through the special grooves made in the pump housing and are then forced into the dynamic seal. The molecules are finally exhausted to a mechanical pump. The gas is increasingly compressed as it goes from the inlet to the exhaust
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Mission statements – You can tell a lot about a company by its mission statement. Don’t have one? Now might be a good time to create one and post it here. A good mission statement tells you what drives a company to do what it does.
Company policies – Are there company policies that are particularly important to your business? Perhaps your unlimited paternity/maternity leave policy has endeared you to employees across the company. This is a good place to talk about that.
Executive profiles – A company is only as strong as its executive leadership. This is a good place to show off who’s occupying the corner offices. Write a nice bio about each executive that includes what they do, how long they’ve been at it, and what got them to where they are.
An impeller is a rotor used to increase the pressure & flow of a fluid.
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Types of Pumps
Gas Ballast Pump
If the gas to be pumped contains a condensable vapor such as water. With the inlet pressure to the pump decreases during pumping, the compression ration necessary to raise the pressure of the trapped gas to a value sufficient to open the exit valve against the combined resistance of its spring and the atmosphere increases. If the compression ratio is such that the partial
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