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Material Of Construction Of A Pvsv On A H2So4 Storage Tank


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#1 J_Leo

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Posted 01 March 2018 - 12:23 PM

Hello,

 

I need to specify the MOC of a PVSV on a concentrated H2SO4 storage tank, with nitrogen blanketing. An existing project used stainless steel valve for the body, seat and trim. Isn’t it ok just use carbon steel body with stainless seat and trim?

 

Thank you.

 

-Leo

 



#2 Technical Bard

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Posted 01 March 2018 - 07:38 PM

No.  The carbon steel body is in contact with the vapours, which will condense acid on the surfaces and dissolve them.



#3 fallah

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Posted 02 March 2018 - 01:43 AM

 

I need to specify the MOC of a PVSV on a concentrated H2SO4 storage tank, with nitrogen blanketing. An existing project used stainless steel valve for the body, seat and trim. Isn’t it ok just use carbon steel body with stainless seat and trim?

 

 

Leo,

 

Is the valve equipped with full nozzle? If so, it might CS body can be used, because only the nozzle and disc are exposed to the acid vapor when the valve is closed...



#4 Bobby Strain

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Posted 02 March 2018 - 12:11 PM

My advice is to use stainless steel body and trim. You might rationalize that the tank vapor is not corrosive to carbon steel. But it's likely that the valve will breathe moist air which would create an environment corrosive to carbon steel. Your acid supplier will probably provide recommendations for materials of construction.

 

Bobby



#5 breizh

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Posted 03 March 2018 - 01:31 AM

Hello,

To add to information above consider the literature attached :

http://www.sulphuric...d/sa_valves.htm

 

You should also talk to reputable vendors based on service condition.

Hope this is helping you

Breizh

Attached Files


Edited by breizh, 03 March 2018 - 01:46 AM.


#6 J_Leo

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Posted 03 March 2018 - 08:38 AM

Dear All,
Thank you so much for your inputs.
To be on the conservative side, I specified stainless steel for both the body and trim, with a note vendor to confirm MOC based on service.
Regards,
Leo




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