Re: Regarding stress check for hydro test

If a piping class has been developed, then you dont need to perform a "simple" calc to determine your hydrotest pressure. That information was already provided and reflected in both the iso and spool drawings. It is also reflected in the piping class details.

• In PipingDesign@yahoogroups.com, "umesh k.n." <umesh_kn@...> wrote:
  >
  > 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@...>
  > To: <a href="/group/PipingDesign/post?postID=M4j9MI0fO2TtQrkFZXvLw_ztWVqHLzX7KF-Yg1R9jUu0Z9yaxnLRLrXi8iwxq0QRVhr1vwqDrOSACkZlc6CUYF_dAQ">PipingDesign@yahoogroups.com</a>
  > 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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  > > http://www.pipingof fice.us/
  > > ============ ========= ========= ========= ==
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