RE: Hydro Test Pressure

From: <Christopher>
Date: Sun May 27 2001 - 13:35:00 EDT

>i can understand that Christopher. I don't have a copy of the latest B31.3,
>but if you do - has there been a change in the b31.3 code allowables?
I don't have a current copy of any of the B31 family, either. If it were me I'd used the allowables specified when the system was built. The 1.3 factor applies only to stamped construction; sounds as if you're looking for temporary blank-offs for hydro-test. If it were me I'd use either store-bought blind flanges design my own using current code rules.

Since the blinds aren't part of a stamped vessel, you could use about anything you want, but you'd be absolutely nuts not to design the blank-offs by Code rules and make sure they're identified as to the maximum allowable working pressure and to be used for testing only. If you don't do this some cowboy will want to use them for cribbing or sash weights or (worse) in a permanent installation. Be sure to use the proper bolting material, too. And if you're trying to save money, don't start with plate. Bare plate is the cheapest thing you've got in the plant.

Christopher Wright P.E. |"They couldn't hit an elephant from <a href="/group/PipingDesign/post?postID=LCJWPOBEg1SxX55eZsqZ_oliYQTp0sq1z8CZa9315eMD7itpnXo3JRnD6Ym07g32NX6tOwgVXB7mTFI">chrisw@skypoint.com</a> | this distance" (last words of Gen.

___________________________| John Sedgwick, Spotsylvania 1864)

<a href="http://www.skypoint.com/~chrisw">http://www.skypoint.com/~chrisw</a> Received on Sun May 27 13:35:00 2001