Actuated Valves for Steam, Natural gas, Oxygen service 3

[Premod]

Hi,
If someone could help me on this.
Is it recommended to use only a globe type valve for steam service (On-Off & control application) or could we use Ball valves for the same as well.
For Natural gas services is it recommended to go for Ball valves only irrespective of the line size (above 10&quotCould we use Fire safe Butterfly valves.
For Oxygen service is there any recommendation on the type of valve to be used.
Hope someone can help me on this.
Thanks,
Premod

 

[ilan7]

For steam and Gas - Try and use the Tripple Offset Valves
(Tyco - Vanessa and others)
We are using them succesfully for both applications.
Do not know about Oxygen!!

 

[Jerri76]

For O2 applications, u might wish to consider the fluid medium:

i. O2-Gas: valves of ductile iron/SS with rubber (i.e. NBR) seating will suffice;
ii. O2-Liquid (-297DegF): 316SS disc with teflon seating will be good.

I hope this will help in a little way.

 

[NGiLuzzu]

Premod,
in general terms, I think triple-offset metal seated butterfly valves, with the appropriate materials selection and devices, are suitable for all of the three applications you mention (of course, further information about service conditions is needed for a costs comparison and a definitive answer).
In any case, try visiting the Manufacturers' websites I listed in Thread408-64692 (see my reply of Aug 4, 2003).
Hope this helps, 'NGL

 

[bljnv]

For oxygen service, Ball valves are suitable.
Ball valves dont do well for throttling service.

 

[kevinf]

For steam service, it depend on the pipe sizes, pressures and temperatures of your application. If you are talking about less than 100 psi steam and pipe sizes less than 2", then commercially available threaded globe valves (with stainless trim) are the most cost effective solution and will provide excellent throttling service. Using a high performance metal seated butterfly valve would cost big bucks and are really only good for 2-position service.

If you are talking about 2" to 6" pipes, then commercial flanged globe/cage valves are excellent for steam. DeZURIK makes a good pressure balanced globe/cage valve for steam up to 150 psid.

Ball valves would be OK for on/off but not modulating control, in smaller pipe sizes. The new "characterized" ball valves available in the commercial industry are not rated for steam.

Can't help you with your other media questions.

 

[Fog1]

It all depends what job you require the valve to perform and the process conditions you have to manage that governs the valve choice.
Personally, I would look at the process conditions and the desired function of the valve then make my decision.
Certain plant specific regulations my restrict the valve specifications but beyond this its down to picking the best technical and commercial solution from everything that is available.

Fog Jones

 

[kob]

Be careful when designing systems for oxygen service. Oxygen supports combustion and you can get almost anything to burn under the right conditions, e.g. steel will burn brightly in an atmosphere of pure oxygen. See the following web sites for more information.

http://www.eiga.org/pdf/Info 15 00e-webfinal.pdf

http://www.wstf.nasa.gov/oxygen/ASTMG4/default.htm