Stress calc for hydrotesting?
A simple hoop stress calc based on code should be sufficient.
This is to ensure that the design pressure selected for the piping class is such
that hoop stress during hydrotest pressure (typically 1.5 times design pressure)
does not exceed code limits.
Rgs,
Umesh Ken.,Senior Piping Project Engineer,
BECHTEL AUSTRALIA, Brisbane, QLD, Australia
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- Original Message ----
From: delacruzjuan1977 <delacruzjuan1977@yahoo.com>
To: PipingDesign@yahoogroups.com
Sent: Tuesday, January 29, 2008 10:54:16 PM
Subject: [PipingDesign] Re: Regarding stress check for hydro test
do you guys really perform a stress calc for every piping system
requiring hydro at the plant? we dont. and we got several dozens of
different piping class from hdpe to duplex to c-moly. but every
single piping installed are fully documented. i meant every single
spool installed - doesnt matter if its utility or process piping.
makes repair, alteration or mods later on a breeze.
- In PipingDesign@ yahoogroups. com, rajesh balapure
<rajesh_balapure@ ...> wrote:
>
> Shailendra,
> You need to put the Sy value in the Input & Hydro test pressure in
CAESAR VER 5.0,C-II will recommend a load case for hydro test else
not.
> Try it.
>
> Regards,
> Rajesh
>
>
> ----- Original Message ----
> From: "Kulkarni, Shailendra" <kulkarnis2@ ...>
> To: pipingdesign@ yahoogroups. com
> Sent: Thursday, 17 January, 2008 1:21:24 PM
> Subject: [PipingDesign] Regarding stress check for hydro test
>
>
> Dear all ,
>
> my query about the above mentioned subject is that-
>
> 1) why Caeser version 5 don't give any result for hydro test stress
> check?
>
> 2) Because it is a load case that pipe under goes at the time of
> commissioning, during this test, site able to verify the integrity
of
> pipe, detect any leakages and weld/flange connection problems.
Since
> this is done only once or twice in the life of the plant, whether
B31.1
> allows us to raise the allowable for 1.0sh for sustained case to
0.9sy
> for hydro test load case.?
>
> Thanks in advance
>
>
> Shailendra kulkarni
>
> Pipng Stress Engineer
>
> Black and Veatch , Pune - India
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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[Non-text portions of this message have been removed]
Received on Tue Jan 29 16:21:00 2008