Q.1 What is the boiling
temperature of Vapor Jet Booster Pump Oil?
Ans. Boiling temperature of Vapor Jet
Booster pump oil is normally between 1600C to 1800C.
Q.2 What are types of Vapor Jet
Booster Pump Oils?
Ans. Vapor jet booster pump oils are of
types-
1. Silicone vapor jet
booster pump oil. It is silicone based oil. For Example: - SupervacSilicone Vapor Jet Booster Pump Oil: SV-JS
2. Hydrocarbon vapor jet
booster pump oil- These are organic oils. For Example: - Apiezon Oil, SupervacOrganic Vapor Jet Booster Pump Oil: SV-JH
Q.3 What is the difference
between Jet Booster Pump Oil and Diffusion Pump Oil?
Ans. Vapor Jet Booster pumps are built for
creating vacuum very fast. Although the ultimate vacuum of Vapor Jet Booster
pump is not very high, Vapor jet booster pump oil has a lower boiling
temperature so that it boils quickly and creates vacuum.
Diffusion pump oil on the other hand
has a higher boiling temperature and therefore takes a longer time in vacuum
creation. Depending upon the grade of Diffusion Pump Oil being used, these can
give a higher ultimate vacuum when compared with Vapor Jet oil.
Q.4 Why is a Booster Pump
required in a vacuum system?
Ans. A diffusion pump and a rotary
pump form a complete pumping system capable of producing high vacuum. Booster
pump is added to increase the speed of pumping. This reduces the cycle time.
Q.5 Can I use Rotary Pump Oil
in my Roots Blower pump?
Ans. No, this should never be done. Roots
Blower pump requires oil of higher viscosity (90-100 cst at 40oC)
whereas rotary vacuum pumps require oils of lower viscosity. Also types of
additives added in both oils are different.
Q.6 What are the types of Booster
Pumps?
Ans. Booster pumps are of following 2
types:-
1. Roots Blower Booster
Pump- This creates vacuum by rotation of lobes.
2. Vapor Jet Booster
Pump- This pump achieves vacuum by diffusion action.
Q.7 Why is it that Vapor Jet
Booster pump doesn’t create vacuum above 10-5Torr, whereas Diffusion Pumps reach vacuum levels of up to 10-10
Torr?
Ans. A vapor jet booster pump is designed to
create vacuum fast by way of different jet design and lowered boiling temperature
of oil. These changes result in lowering of vacuum level.
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Written by: Anshuman Punj.
