Which is better material for Seat / Control Valves / Sour Service

[Vino Varghese]

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

[pgoswami]

 

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,

pgos...@quickclic.net

 

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

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[Vino Varghese]

Dear Sir,

 

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

 

Thanks

VPV

 

________________________________________________________________________-

[sachin sankhe]

Hi,

Stelliting is done for hardness purpose to avoid wear due to friction durings its operational life

Hence stelliting cannot be replaced with SS316

Regards
Sachin.Sankhe

On Wed, 16 Mar 2011 08:56:30 +0530 Vino Varghese <vinopv...@gmail.com> wrote

>

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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>To post to this group, send email to material...@googlegroups.com
>To unsubscribe from this group, send email to materials-weld...@googlegroups.com
>For more options, visit this group's bolg at http://materials-welding.blogspot.com/
>The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
>

[Suneel Gore]

In sore gas condition The Steelite 6 wont be of much use , 316L would show better resistace than st6 in this place

[kannayeram gnanapandithan]

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

[Engineering Solution]

Dear VPV

For SOUR gas application you must consider effect for hydrogen cracking means you have to consider body material, seat and ball material etc. What will be minimum temperature of medium?

Regarding TRIM  you have to go stellite 6+ENP  but you have further check ball and other parts material. Also  for SOUR specially Gas application valve you have to consider fire safe and related certificate.

 

Regards

Saleem

Kingdom of Bahrain.

 

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[Schuyler White]

[atul khatri]

SS 316 is suitable for this situation. 

SS 316  has superior resistance to corrosion for services which are corrosive for 13Cr (F6).

Regards,

Atul Khatri

Principal Engineer- Piping

Haldor Topsoe India Pvt. Ltd

https://www.linkedin.com/in/atul-khatri-95ba3667

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