Service is Sour Oil and Gas mixture (Presence of Sand)
Service is Sour Oil and Gas mixture (Presence of Sand)
(OP)
Sand level in the process fluid is 250 PPM. Fluid is sour Oil and Gas mixture.
1)Does the ball and seat require Tungsten Carbide coating?
2)What are the criteria to select Tungsten Carbide coating?
3)Are there any less expensive alternatives for TC?
4) Suppose one compares x750 or 718 material versus TC coated 316L in the above application, which is better?
1)Does the ball and seat require Tungsten Carbide coating?
2)What are the criteria to select Tungsten Carbide coating?
3)Are there any less expensive alternatives for TC?
4) Suppose one compares x750 or 718 material versus TC coated 316L in the above application, which is better?





RE: Service is Sour Oil and Gas mixture (Presence of Sand)
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RE: Service is Sour Oil and Gas mixture (Presence of Sand)
Thanks for sharing your view.
RE: Service is Sour Oil and Gas mixture (Presence of Sand)
Now I suppose the question is, do you need throttling?
TC is hard and wear resistant, so you might need to specify that or a similar material for your throttling valve, unless you can install an orifice plate (in an easy to access and replace location) to take the pressure cut, with a sand trap in front of it if needed.
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RE: Service is Sour Oil and Gas mixture (Presence of Sand)
RE: Service is Sour Oil and Gas mixture (Presence of Sand)
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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RE: Service is Sour Oil and Gas mixture (Presence of Sand)
What is the temperature and the pressure? Is this a throttling valve? If it is, what is the downstream pressure. What size line, what schedule, and what flowrate? Does it have to shut off to zero observable leakage or is some amount of dribble either expected or necessary?
With sour service you need NACE materials. Most of the hardened materials do not meet NACE specs, which frequently specify allowable maximum hardness limits for specific alloys. Some hard alloys do meet NACE, but your valve supplier will have to certify each part and it's a good idea if you know what is acceptable.
The right answer for the application could be anything from the rubber pinch valve mentioned earlier to a rubber-lined butterfly valve to an all-ceramic ball valve or even a WC and ceramic angle-type globe control valve. Define the application.
Oh, and BigInch: There ARE ball control valves and they work very well when applied properly. Your statement is correct if interpreted that one does not just grab any ball valve to use it for modulating.
RE: Service is Sour Oil and Gas mixture (Presence of Sand)
http://virtualpipeline.spaces.msn.com
RE: Service is Sour Oil and Gas mixture (Presence of Sand)
RE: Service is Sour Oil and Gas mixture (Presence of Sand)
You should start a new post with your questions.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of Eng-Tips Forums?
RE: Service is Sour Oil and Gas mixture (Presence of Sand)
With our experience on Sand service, there is no comparison between stellite 6 and Tungsten Carbide. So far we have experienced that the Tungsten Carbide coating is the best solution for Throttling Sand Service.
If the service is cavitating or Flashing, please select a Globe or Angle Control Valve with multi stage Anti Cavitation Trim with Tungsten Carbide Inserts.
I Believe even a V Notch Ball valve with Ceramic lining can also be used for throttling service.
Also important to note is though Tungsten Carbide is very hard, it cannot withstand sand service for ever. For a typhical Cavitating Throttling Application, Tungaten Carbide Trim will withstand for a maximum of 2 Years only.
RE: Service is Sour Oil and Gas mixture (Presence of Sand)