REQUIRMENT FOR TEMPORARY BLIND FLANGE USED FOR HYDROTEST

[asad azmi]

Dear All,

 

A vessel is being fabricated as per ASME SEC VIII DIV 1.

 

A temporary blind flange fabricated from plate is used for hydrotest. Hydrotest pressure is 3003 PSIG.

 

During hydrotest it was observed that contractor has welded two plates to obtain required thcikness for temporary blind flange.Please refer attached photo.

 

Whether practise of acheving required thickness of blind flange by welding 2 or more plate is safe and acceptable.

 

please give code reference.

 

Thanks & Reagrds

 

Asad Azmi

[Ramprasad Chari]

It is not safe.Could be dangerous.

Regards

aarpee

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[prasad rao]

Can you Brief us in what way it is unsafe and dangerous .

 

As per the above photograph it is totally welded  so there is no risk  in that .But it not Good practise you say.

[veera raghava kommisetti]

When two plates are welded, which means only welded at edges.
so there is chance of are gap between the plates else where, which is
effectively single plate thk. (If lamination exisit at 50mm depth on
100 mm plate then effective thk is only 50mm). same logic applies.

[vijayan]

Hi

Temporary Blind flanges thickness may be layered to meet the hydrotest
pressure thickness. However, the welding of both plates shall be layered as
per ULW-17(g) and fig ULW 17.4 of ASME Sec VIII, Div.1.

BR
M.Vijayan

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[chandrakant yadav]

Dear Azad

 

It is unsafe to do like that

 

Can you please tell me is that on the top of flange is vent for the pressure gauge and welded to the top plate. If yes and the the plates are only welded on the edge as I understand  from the figure the  pressure is on the thinnest plate will be the same as on the thickest  which is totally unsafe.  I am totally agrees with M.Vijayan the welding of both plates should  be layered as per ULW-17(g) and fig ULW 17.4 of ASME Sec VIII, Div.1. but in that case also u canot put the vent on the top.


With Kind Regards,

Chandrakant Yadav 

LINDE PROCESS PLANT (SOUTH AFRICA)

Tel.: +27 797120607
E-mail:- chandrak...@linde-le.com
yadav.ch...@gmail.com