Re: [MW:10441] RE: 10362] Which is better material for Seat / Control Valves / Sour Service

pl go for ER NiCrCo-A which is being used for high temp corrosion and Erosion resistance

 

Pandithan

in-Charge/Welding Tech

Cethar vessels Ltd

On Wed, Mar 16, 2011 at 11:41 PM, Vino Varghese <vinopvarghese@gmail.com> wrote:

Dear Sir,

 

I will Appreciate if you can forward more information related same.

 

Thanks

VPV

 

________________________________________________________________________-

On Wed, Mar 16, 2011 at 7:05 AM, pgoswami <pgoswami@quickclic.net> wrote:

 

Hello VPV,

 

Stellite 6 alloy is a common material for valve seats  both for sour and non sour services. S.S 316 is not the exact replacement for Stellite. 316 S.S basically lacks the strength and hardness which is required in a valve seat to avoid galling and erosion. Any one of those can cause "passing of valves".

 

Please look in MR-0175 -part -3 on the acceptance of Co alloys for sour services.

 

Should you be interested I may forward you some more information  which I have.

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario,Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

---

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vino Varghese
Sent: Tuesday, March 15, 2011 5:59 AM
To: materials-welding@googlegroups.com
Subject: [MW:10362] Which is better material for Seat / Control Valves / Sour Service

Dear Experts,

 

The Data sheet for Control Valve calls for Seat Material of Trim as Stellite 6 + ENP and Supplier is offering SS 316.

Whis is better - Is it Stellite 6 + ENP or SS 316?

 

Info: Service to be used is Sour Service.

Temperature : 60 Degree Centrigrade

Inlet Presure: Max. 0.5 bar g

Otlet Presure: Max. 0.3 bar g

 

Appreciate to see response ASAP.

 

Regards

VPV

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