Skip to main content

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

By Materials & Welding
 
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


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/
-~----------~----~----~----~------~----~------~--~---

Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

Re: [MW:10788] ON PLOT PIPING & OFF PLOT PIPING

By Materials & Welding
Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...
Post a Comment
Read more