mechanical seals for cryogenic service 1

[richard27]

Dear all,
I am current undergoing a project into the use of mechanical seals in cryogenic service. This will cover seal face materials, gaskets, o-rings, elastomers, metallurgy, seal types, pump type and orientation, the works really. Temperature range and products will vary from ammonia duties, refrigerants, hydrocarbons etc. at temperatures from zero to -75. This I appear to be making headway, but with lower temperatures and liquified gases, I have ran out of ideas

Can anyone offer any advise or links. Do you know of any internet based publications?

Any assistance will be greatly recieved.

regards
Richard27

 

[unclesyd]

My information is dated but if you can get hold on “Low Temperature and Cryogenic Steels” a USS materials manual it is very good with design guide lines.
There is also some good NASA references on handling cryogenics. I have no idea on locating them under the new systems. But they are worth a try.

http://cryo

http://wwwebber.gsfc.nasa.gov/Default.html

This is a NASA site with some good leads. It used to be a lot better.

http://www.cryoco.com/

Have used his book and read articles

http://www.mcnallyinstitute.com/

mechanical seal information

John Crane and Chesterson both made cryogenic seals. None of my leads to High pressure pumps are working.
There are quite few people that make the bellows long stem valves

Anecdotal but interesting.
We were one of the first chemical companies allowed to use LH2 in the early 60's. As we were unloading to the vaporizer liquid was dripping from the transfer line. Someone mentioned that it was water condensing. This was quickly corrected by the company representative, “ It’s liquid air”.

 

[richard27]

Thanks unclesyd, the NASA site was very useful. I was aware of the other two. the McNally site is always a wealth of information.

richard27

 

[asukid99]

http://www.johncrane.com/amer/english/product/type285.html

Type 285 Metal Bellows seal from John Crane. -much of an approvement over the older 28LD design. It is gas lubricated and non contacting. We use them from 20 psig LOX to 1050 psig liquid air.

 

[NGiLuzzu]

richard27,
try to visit:

http://www.seals.saint-gobain.com

Hope this helps, 'NGL