SPWHT

makrands9 · **Posted:** Fri Oct 29, 2010 8:18 pm

Dear Sirs,
I m having some doubts while ordering materials.
Actually my complete column will undergo the stress releving cycle at 595 degree celcius for 1hr & 50 minutes. I m having confusion for some STD materials like SA 106 GR B, SA 234 GR WPB, SA 105. Is this materials will undergo SPWHT for above mentioned SR cycle as all the above are STD items to be procured. How can i decide that materials requires SPWHT (simulation PWHT)?
Also what about SPWHT for internals of material SA 240 GR 304 L?

Dr. Koelbl · **Posted:** Mon Nov 01, 2010 10:25 am

Makrand,

UCS-85 will answer all your questions on HT of test specimen.

DK

makrands9 · **Posted:** Thu Nov 04, 2010 4:38 pm

Hello DK sir,

Thanks for your reply....

I read UCS-85. As per UCS-85(e) PWHT is not required for STD items specified in UG-11(a) i.e. pipe fittings, flanges, nozzles, welding necks, welding caps.

So, this means that my vessel is going under PWHT, but still the STD parts like flanges of ASME B-16.5, pipes of ASME B-36.10 & 36.19, SS & CS fittings, does not required SPWHT?

sanjeev_shukla70 · **Joined:** Wed Apr 18, 2007 2:05 pm **Posts:** 260

As per code, if you are using a material from P No 1 Group 1 & 2, simulated heat treatment is not required for any of the item including plates if heat treatment during fabrication is at a temperature below lower transformation temperature of steel.

You need to however check if it is required as per client specification.

makrands9 · **Posted:** Tue Nov 09, 2010 3:40 pm

Dear Sirs,

Can anyone please tell me what is the technical reason behind these STD parts do not required SPWHT as per code (UCS-85)?

Basically my question is, after performing PWHT of vessel along with all these STD fittings, flanges, pipes, how i am sure about the strength of these parts is as same as before performing PWHT?

Gilbert · **Posted:** Wed Nov 10, 2010 3:26 am

Stop questioning all over again...study Sanjeev and DK reply.

makrands9 · **Posted:** Wed Nov 10, 2010 4:36 am

Dear Gilbert sir,

This forum is to solve the technical questions & me too asking the same. All persons are having codes & after reading too if questions are not solved then they try this kind of forums.

Please correct me if i am wrong.

Also let me know if you are having my questions answer. I always appreciate good quotes....

SPWHT

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