[MW:1021] CS or LTCS material as per STOOMWEZEN Rules ( PED rules ) - Dutch Power piping code

First I would suggest you to look in the archive on the subject of impact testing. Quit a lot of discussion
and technical references are available. Alternatively you can search the blog.

As per general rough calc. the thk is around 50mm.
1) As per B31.3, fig. 323.2.2A it would be on the curve D more or less escaping the V Notch test at -20degC.
2) From my exp. of statistical records of test certificates, the A671 & A672, normalised and tempered, from Europe, China, SK and India none have gone below 35 joules at -45 deg.C.

So you can go ahead without the notch test, but ensure your supplier gives in writting the compliance to Stoomwezen limits.

Regards,
Kannan

----- Message from "Tirumala B N Tagore" <tagore.tbn@gmail.com> on Tue, 12 Aug 2008 09:06:50 -0700 -----

To:	materials-welding@googlegroups.com
Subject:	Re: [MW:1018] CS or LTCS material as per STOOMWEZEN Rules ( PED rules ) - Dutch Power piping code

Dear Mr.Rahul,
27 J energy value is not an unachievable value.
Refer to ASME Sec VIII Div.2 - 2007 edition which is totally modified. 27 J energy value is the minimum  for lower strength materials where as higher values are indicated for other materials.
It is possible for CS  at -20 deg C .Normal CS pipes shall be able to be fit up to -29 deg C .
tagore

On Tue, Aug 12, 2008 at 7:32 AM, Rahul P <rahulpisat@googlemail.com> wrote:

Hello All,

Can anyone explain me about the Impact test requirement of material as
per Stoomwezen rules ?
from ASME 31.3 we can find the Impact test requirement for CS, as per
thickness and minimum design temperature.
But in Stoomwezen rules there is a minimum requirement of rupture
energy of 27 J.
I have to design a pipe class with -20 deg C as minimum temperature
for 145 bar pressure and size of 30 inch & carrosion allowance of 6 mm
With these design condition I expect to have very high thickness for
pipe.
is it possible to have cofirm 27 J requirement for such high thickness
of CS ?
Or it is advisable to change to LTCS material ?

thank you,

RahuL P --~--~---------~--~----~------------~-------~--~----~
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