[MW:547] Re: Hydrotesting of Bellow Seal Valves

 

hydraulic shell pressure test: the valve, prior to assembly with the bellows, in partially open position, shall be subjected to pressure test with water(with suitable corrosion inhibitor) at 1.1 times the maximum rated working pressure of particular pressure rating class of the valve. the test pressure and acceptance criterion shall be as per BS6755-part I or API598 or ANSI B 16.34.

 

hydraulic seat pressure test:the valve, in closed position, shall be subject to pressure test with water (with suitable corrosion inhibitor) at 1.1 times the maximum rated working pressure of the particular pressure rating class of the valve. the test pressure and acceptance criterion shall be as per rate A of BS6755 part I or API 598 or ANSI B 16.34.

pneumatic pressure test:the valve, upon final assembly including the bellows, in partially open position shall be subjected to pressure test by dry air or GN2 at 1.1 times the maximum rated working pressure of the particular pressure rating class of the valve. the test procedure and acceptance criterion shall be as per rate A of BS6755  part I or API 598 or ANSI B 16.34.

 

information courtsey: National aerospace laboratories Bangalore

 

Regards

shyam

 

On 1/31/08, Sanjay_Gandhi@fwuk.fwc.com <Sanjay_Gandhi@fwuk.fwc.com> wrote:

Shwani,

Hydrotest of bellow seal valve is carried out with bellows installed. The manufacturer do the low pressure air testing internally to ensure the welds in bellows are free from any leakage. Then the hydrotest of complete body including bellows will be undertaken. The valve is kept open and the bellows will be subject to external pressure.

When conducting the seat closure test the bellow will not see the pressure.
 

Best Regards,

Sanjay Gandhi

desaid@toyoindia.com Sent by: materials-welding@googlegroups.com 31/01/2008 12:29 PM Please respond to materials-welding@googlegroups.com

To piping_valves@yahoogroups.com cc materials-welding@googlegroups.com Subject [MW:542] Hydrotesting of Bellow Seal Valves

Dears,

Can any one inform how testing (hydro & pneumatic) of Bellow seal valves are generally carried out? Shell Test & seat test both.
i.e. with bellows or without bellows?

If there is some detailed procedure available of reputed vendor then pls. send.

Thanks & Regards,
Dhwani Desai.

======================================================= Confidentiality Notice  This communication and the information it contains:-  (a) Is intended for the person(s) or organisation(s) named above and for no other person(s) or organisation(s).   (b) May be confidential, legally privileged and protected in law. Unauthorised use, copying or disclosure of any of it may be unlawful. If you have received this communication in error, please contact us immediately by email at Postmaster@fwuk.fwc.com. ======================================================= 

--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
-~----------~----~----~----~------~----~------~--~---