Hydrotest Cover thickness calculation

[Venkatachalam Ponnusamy]

i have a pig launcher & receiver with the end flange size as 48" x 600# x 27 mm pipe wall thickness, to carry-out hydro test now i wanted to calculate the cover/blind thickness to carry-out hydrotest @ 140 Kg/cm2, any suggestions/guide that can help me to move forward.

Regards
Venkat

 

[LittleInch]

Is this flange to a recognised code?

If so what is it - you call it a class 600 flange, but to ASME B 16.47?

If so then ~140 bar for a hydrotest is within its capabilities.

Oh and a pig trap is not a pressure vessel....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[saplanti]

Some codes and specifications for pig traps refer unfired pressure vessel standards, some do not.

Coming to the subject, I suggest you talk to a professional for design issues. You are asking for help to design, not some details to discuss.

As a designer you need to find out if there is a standard blind flange available. For some the blind flange weight might not be managable easily. So they choose the similar WN flange and a formed head ( semi-elliptical or hemi-spherical whatever you can find for the pressure) for the test.
I guess you use the quick opening closure for the test on the other side.

Hope it helps.

 

[r6155]

As said saplanti, use quick opening closure.

See good information in

http://www.spxprocessequimpment.com

Regards

 

[Venkatachalam Ponnusamy]

@Littleinch

The design pressure is 93 Kg/cm2 and hence the the Flange rating is 600#. However the Hydro test shall be done for 1.5 times of design pressure as per specification hence 140 Kg/cm2.
Also the flange code will be ASME B 16.47 Series A.
Yes it is for Pig Trap (Launch & Receive the intelligent pigs for gauging and cleaning purpose) hence the process fluid pressure will act and shall be designed for Pipe line fluid pressure.

Regards,
Venkat

 

[Venkatachalam Ponnusamy]

@r6155

Noted already QOC is used on Major Barrel end.

Regards,
Venkat

 

[Venkatachalam Ponnusamy]

@saplanti

Noted your message.

 

[SnTMan]

Venkatachalam Ponnusamy, you could just use a B 16.47 Series A blind.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand