2 replies to this topic

Dear Friends

We have one order from my client to supply ON/OFF valve from size 4 up to 24 inch. Application is highly sour (H2S and CO2 and water and also a little CL). Material that costumer is ordered is A186 F6a for ball and also request for fully stellited of ball. I asked with some ball valve manufacture for fully stelliting of ball but they didn’t accept and do stelliting only contact area (areas contact between ball and seat ring). They don’t consider high corrosive media that cause SCC on ball. My questions are as follow:
1- What are manufacturer‘s limitation for apply stellite overlay on ball?
2- Is there another method instead of stelliting that cover corrosion and erosion concerns?(tungsten carbide and ENP was not accepted by my client because they had bad experience with it in sour service)

Please note that fluid is produce in well and these valve are used in wellhead facilities. Also rating of these valve are 1500#
I ask for specialist on this subject to help me to able correct decision.
Thanks all
SAM

[Zauberberg]

Attached are the references from API 14E: selection of valves and corrosion considerations. They may help you in getting the answer.

As for the questions you have raised, (1) can be answered by the manufacturer only and, (2) yes certainly there are valves where internals/sealing parts are made of solid alloy to improve sealing at high DPs and when handling corrosive production fluids. We have several of that kind in the Inlet Reception facilities, mostly level- and flow-control valves. I will try to find the valve specification (I have used the word "valve" too many times and I am stopping now) and upload it for your reference.

Best regards,

Attached Files

•  API 14E - Selection of Valves.pdf   316.15KB   33 downloads
•  API 14E - Corrosion Considerations.pdf   112.27KB   25 downloads

Thanks for your response

If you have some valve specification same as my application it is very helpful for me, I ask sent it. But important things is why most of manufacture have some problem to do stelliting on ball and I want to know there is another method (exception tungsten carbide and ENP) which has good compatibility with our condition.
Thanks
SAM
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