[MW:879] Re: 867] pressure testing - with attachment

Please refer para B 31.3 345.9 where it is clearly mentioned that the
conditions are stated in 345.1(c). And in 345.1(c) refers that both
the conditions (1) & (2) must be fulfilled to waive a hydrotest.
In general, testing in manufacturers premises are not normally taken
care unless it is witnessed by the purchaser and that is also for
specific requirements.

RB

On Jun 20, 11:12 pm, "Tirumala B N Tagore" <tagore....@gmail.com>
wrote:
> If the pipe is procured as per  materials pecification and  duly hydro
> tested at mills and  pipe line segments are tested individually at works ,
> then field NDE would suffice and  end user  may waive off field hydro test.
> exception to this is any PWHT for field welds done , in such cases exception
> to Hydro test/ Pneumatric test is not recommended.
> Pneumatic test can be done in lieu of  Hydro test subjected to proper
> precautions, tieing in at various locations are done for safety reasons
> based on energy calculations.
> Tagore
>
>
>
> On Thu, Jun 19, 2008 at 10:53 PM, Rituraj Bose <boser2...@gmail.com> wrote:
>
> > Dear Mr. Subramanium,
>
> > Please note that RT or any NDT cannot replace Hydro or Pneumatic test.
> > It can only certify the welded joint, not the whole pipe line.
>
> > R. Bose
>
> > On Jun 16, 10:21 am, "shiva.subramanium" <shiva.subraman...@wsiko.com>
> > wrote:
> > > Dear Members, Mr. Surya and Mr. Raghuram
>
> > > Due to water problem, you cannot go for pneumatic test based on TP = 110%
> > of
> > > DP) because the hazard of energy release.
>
> > > Just calculate the pneumatic pressure for the system
>
> > > Hydrotest = 60 KG/cm2, so design pressure is around 40 Kg/cm2
>
> > > For pneumatic test, pressure shall be around 44 kg/cm2.
>
> > > Imagine the hazard of energy release with reference to the
> > > attachment(attached previous message of Criticality of Hydrotest pressure
> > vs
> > > pneumatic pressure)
>
> > > So, better you can go for 100% RT/UT for all Butt joints and PT/MPT for
> > > attachment weld as per B31.3 para 345.9.
>
> > > S. Siva Subramanian
> > > World Services Italia S.p.A., Kuwait Operations,
> > > P.O. Box : 28928 - Safat : 13151 - Kuwait.
> > > Tel : +965 3262945 / 3260338 / 3263987 / 3263691/92, Ext.\ 207
> > > Mobile - 00965 632 7395
> > > E-mail :  shiva.subraman...@wsiko.com
>
> > > -----Original Message-----
> > > From: materials-welding@googlegroups.com
>
> > > [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula
> > Raghuram
> > > (Mumbai - PIPING)
> > > Sent: Monday, June 16, 2008 10:44 AM
> > > To: materials-welding@googlegroups.com
> > > Subject: [MW:867] pressure testing
>
> > > Assuming your design code is B31.3, refer para 345 for the creteria (TP
> > > is 110% of DP)
>
> > > Also refer earlier message posted in this group titled  "Criticality of
> > > Pneumatic pressure test vs Hydrostatic on piping system"
> > > we should always remember that is necessary to evaluate
> > > the design aspects of material selection for piping lines to be
> > > submitted to pneumatic test: in these cases ASME B 31.3 require that the
> > > materials be guaranteed against their brittleness at the ambient
> > > temperature during pneumatic test.
> > > Typical cases are the plants where the ambient temperature could reach
> > > even minus 50^C (e.g. some parts of Russia).
>
> > > -----Original Message-----
> > > From: gajjalla surya prakash [mailto:gajja...@gmail.com]
> > > Sent: Monday, June 16, 2008 12:32 PM
> > > To: materials-welding@googlegroups.com
> > > Subject: pressure testing
>
> > > dear members,
>
> > > we are doing hydrotest for the piping systems and now facing the
> > > problem of water scarcity ,and our customer praposes to perform the
> > > pneumatic test .
>
> > > for example hydrotest pressure is 60kg/cm2 what should be the
> > > pneumatic pressure . where can we get this information.
>
> > > surya prakash gajjalla.
>
> > >  Scanned_ (2).pdf
> > > 141KDownload- Hide quoted text -
>
> > > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

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