[MW:7420] Dial indicating pressure gages - Range for hydro testing

Since this posting does not contain a meaningful subject line hence was not posted in the group, instead I am directly replying with changing the subject line. Members are requested to take care hence forth.

 

Dial indicating pressure gages used in testing shall be graduated over a range of about double the intended maximum test pressure, but in no case shall the range be less than 11⁄2 nor more than 4 times that pressure. Digital reading pressure gages having a wider range of pressure may be used provided the readings give the same or greater degree of accuracy as obtained with dial pressure gages (UG102(b) for Sec VIII div 1 vessels).

 

And many of the company standards indicate this requirement, for e.g. ARAMCO specifies

"The gauges must have a range such that the pressure specified for the test is between 30% and 80% of the full range".

 

From: Nachhattar Singh [mailto:n.singh@moodyint.com]
Sent: Thursday, October 07, 2010 1:46 PM
To: materials-welding@googlegroups.com
Subject: RE: [MW:7407] difference between tightening test and tightness test in piping work.

 

Dear All

 

Can you please confirm as to which standard / code call for a Pressure gauge rating to be 2 times the test pressure of the equipment .

 

The second question is what do you mean by  the term   Mil

 

Thanks and regards

 

 

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Nachhattar Singh Director Phone: 91-22-42333600 Extn :624 - +  91-98201 81158 Fax:+  91-22-42333607 Email:n.singh@moodyint.com Web: www.moodyint.com Web: www.edn.com.au Web: www.petrospect.com Web: www.pro-inspect.com Moody International (I) Pvt Ltd 406-410, NAVKAR CHAMBERS, 'B'Wing Marol Naka , Andheri-Kurla Road , Andheri ( E ) , Mumbai Maharashtra 400 059 India

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