Re: [PipingDesign] Regarding stress check for hydro test

From: <M.>
Date: Thu Jan 17 2008 - 09:26:00 EST

Dear Sajit

The test pressure producing hoop stress of 90% of SMYS is for newly constructed in-plant piping. There are several exceptions to this value in case the line is limited by flanges, valves or other component. Furthermore, this 90% of the SMYS value is not applicable for lube and seal oil piping, vacuum piping, flare lines. In conclusion, the test pressure shall not be less than the minimum test pressure per ASME B31.3 paragraph 345.4.2. This is the value should aways be remembered

Khaled Mahmoud
Saudi Aramco
Jeddah Refinery

> There was another post that lead to this same Aramco
> test at 90% yield
> subject.
>
> The Aramco standard says that the hoop stress (not
> the combined stress) may
> be as high as 90% of yield. See para 7, Pressure
> testing of piping of
> SAES-L-056.
>
> During projects, it is usually the clients standard
> that takes precedence
> over the international codes and standards.
>
> Perhaps someone working with Aramco on this group
> can check the correctness
> of this, in light of John's remark below.
>
> Plastic pipe strength calculation involves a limit
> stress envelope formed
> between longitudinal stress and hoop stress. Is such
> a concept there for
> the ASME B31.3 code?
>
> Sajit
>
>
>
>
>
> John Luf
>
> <jcluf01@yahoo.co
>
> m>
> To
> Sent by:
> PipingDesign@yahoogroups.com
> PipingDesign@yaho
> cc
> ogroups.com
>
>
> Subject
> Re:
> [PipingDesign] Regarding stress
> 17/01/2008 02:52 check for
> hydro test
> PM
>
>
>
>
>
> Please respond to
>
> PipingDesign@yaho
>
> ogroups.com
>
>
>
>
>
>
>
>
>
> First read in detail the testing section of whatever
> code you are working
> under. IF the code you are doing your work under has
> a code requirement for
> longitudinal stress versus an allowable alue then
> CAESAR II should
> calculate and compare these SL stresses
> accordingly...
>
> Best Regards,
> John C. Luf
> Cleveland Ohio U.S.A when I'm not in Austria
>
> Member B31.3, Piping Engineer - Stress Analysis,
> Pipe Supports, Component
> Design, and Surge Analysis... according to my
> daughters master of
> unimportant trivia
>
> http://suntzuquote.blogspot.com/
>
> ----- Original Message ----
> From: "sviswan@technip.com" <sviswan@technip.com>
> To: PipingDesign@yahoogroups.com
> Sent: Thursday, January 17, 2008 4:38:56 AM
> Subject: Re: [PipingDesign] Regarding stress check
> for hydro test
>
> Aramco SAES calls for hydro test pressures that
> would create a hoop stress
>
> of 90% of the SMYS. This is for ASME B31.3 piping.
> At the time of testing
>
> the resultant hoop stress will also include stresses
> due to other sustained
>
> loading. This should be contained within the 10%
> balance. Wonder, what if
>
> it does not. No specific check is done to ensure
> this.
>
> Sajit
>
> Save a tree...please don't print this e-mail unless
> you really need to.
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