Wet Vacuum vs. Dry Vacuum 1

[aschnerch]

Can anyone explain to me the difference between a "wet" and a "dry" industrial vacuum system? What are the advantages and disadvantages of each?

I have done some searching on the net, but have not been able to find what I'm looking for. Any help would be greatly appreciated.

 

[quark]

Wet vacuum systems are those systems which use liquids as motive fluids for creating vacuum. Typical examples are liquid ring vacuum pumps and ejectors. Ejectors require huge space. When we deal moist gases with liquid ring pumps, the motive fluid gets diluted and looses its property.

Dry vacuum systems typically use roots blower type construction. The initial cost is very high. Generally works well for moderate vacuum levels. Power consumption is relatively high.

For further information go to

http://www.vacuum-guide.com

http://www.bocedwards.com

http://www.sterlingfluidsystems.com

http://www.dekkervacuum.com

Regards,

 

[griffengm]

aschnerch,
Quark may be correct for a process system. I'm not certain of your end use so can only say that there is another application of the term.
It is applied to systems capable of picking up dry materials only(dry), liquids(wet) or liquids mixed with solids(wet).
The first would be for something like collecting and/or transporting powders, fine chips or small solids(grain). Wet systems might be used for cleanup of spills or to transport slurries.

Griffy

 

[aschnerch]

quark & griffengm:

Thanks for your reply to my question. I wish I could have given you more detail about the application, but we have these systems in our plants overseas, not the plant I work in. In any case, I'll check out the links you provided and go from there.

Once again, thanks for your replies, I appreciate it.

 

[Torricelli]

dear Aschnerch,

The dry pumps do not use an auxiliary fluid.

The advantage of a dry pump is to avoid a contamination:
- No contamination of the product (product vapours can be condensed and recovered)
- No contamination of the auxiliary fluid (no cost for treatment and waste, nearly no maintenance)

Now to understand the advantages / disadvantages of a dry pump just remember
the 3 functions of the auxiliary fluid: „sealing“, lubricating“ and „cooling“.

No lubrication => no contact between the parts
No sealing => tight clearances
No cooling => high temperatures

Further points under

http://www.vacuum-guide.com/english/equipment/hw-drypumps.htm

The decision really depends of you application (affordable price, material required, sensitive gases,..)

Regards
ET

http://www.vacuum-guide.com