Re-rating - pressure test thoughts

chris, it is legit under the code. VEssels/piping are rerated down and occasionally up.It is possible to show it can be changed and i have done it way too often , but in the end always been approved by the AI and ASME agency.
done lots of vessel and piping rerates, too many to like. As others have said herein the
vessel/piping is undersized or has extra unused capacity. (available wall thickness etc etc). Often it was just done wrong. eg.Eng was quick and cheap and picked anything. The trick is finding the weakest link..

It is highly stressful work in every sense and the people you are dealing with have no idea....
End user expectations are totally unrealistic. rapid formula for burnout. I dont think its worth the grief.

The work is always compared the work aginst the cheapest 2nd hand "pre-owned" option and they always want guarantees up front, with crap /nothing for info and no budget to gather the data needed..

• Original Message ----- From: "Christopher Wright" <chrisw@skypoint.com> To: <PipingDesign@yahoogroups.com> Sent: Thursday, September 08, 2005 12:14 PM Subject: Re: [PipingDesign]pressure test thoughts

>
> On Sep 8, 2005, at 11:37 AM, John Luf wrote:
>
> > Yes Indeed thats the Mother of all of work on this subject
> If the API becomes a Code standard, that'd explain some things. But
> currently re-rating isn't possible with the ASME PV Code. Once the
> stamp is applied that's the end of it; then the National Board Code
> applies. I'd be interested what happens to the ASME Code plate when you
> re-rate a vessel. On that LP tank that blew up the code plate they
> slipped in was for a different vessel diameter and length than the tank
> it was supposed to apply to. That was the first indication that
> something was amiss. I'm assuming the seller just had a box full of
> Code plates on his desk and he just picked one.
>
> Christopher Wright P.E. |"They couldn't hit an elephant at
> chrisw@skypoint.com | 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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Received on Fri Sep 09 12:57:00 2005