RE: Hydro Test Pressure

From: <SARE>
Date: Mon May 28 2001 - 02:11:00 EDT

. designing flanges for vessels and piping are our cup of tea. we're using coade codecalc to qualify it. we're also very familiar with the behavior of the bolting. matter of fact, for big jobs we utilized oour very own bolt tensioning machine (thanks to paul, we also surf the boltscience web site). you have forgoten to mention about material traceability, heat number and pmi (we're using a spectroport for this) to ensure one is using the proper material to section ii or astm. i also don't agree that u can just use anything u want. it may not be part of the vessel but is still very much part of your piping system. therefore material is still defined by the asme.

can't use the same code when the plant was built since modifcation, testng and repair of piping, tanks and vessels already in service are defined by the current API standard 510, 653 and 570 and our company specications that require us to use the latest rev.

but the way, im a p.e. (1984) and not a cowboy. can't afford to be a cowboy, the result will be catastropic/disastrous to me and my buddies here. but i still need some one to tell me if there was change in the current b31.3 (else we'll just order it).

ralph
lead engineer - fixed equipment reliability/ core maintenance.

-----Original Message-----
From: Christopher Wright [mailto:chrisw@skypoint.com] Sent: 27 May, 2001 8:36 PM
To: ?
Subject: RE: [PipingDesign] Hydro Test Pressure

>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=52Mnbmkl5w1minnVOc2y1JcL1NSoLWvsEm9q7IKvM9xSHxdhHvqON4MzLGzpkMuZ4D1-i2VIQ_P393s">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>

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Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Mon May 28 02:11:00 2001