Re: [MW:14188] HOTTAP on SOUR LINE (PWHT Required)

Dear Mr. Majdi,

Good Morning.

We are planning to do hop tapping of LPG pipe lines at Oman. Hope you
might have completed the hot tapping of LPG.

Can you please share your experience of the same. Please give details
of firm who has done this work.

Can you please give details ie. which country this hot tapping is
done, what are the problems faced and extra precautions followed. Can
you please give your contact no, so that i will contact you.

Regards

N.V. PRASAD

On 11/28/10, Majdi N Elyyan <melyyan@gmail.com> wrote:
> Dear All;
>
>
>
> We have a hot tap on LPG line (Sour service) which require PWHT.
>
> The run Pipe is 4", the branch is also 4", split tee will be used.
>
> As per shell DEP-31.38.60.10 - for Hot tapping, clearly mention:
>
> Hot-tap welding should not normally be performed on materials which require
> post-weld
>
> heat treatment. However, if stress relieving or post-weld heat treatment is
> required, a
>
> specialist shall be consulted to assess whether it is feasible to make the
> specific
>
> hot-tapping operation with post-weld heat treatment.
>
> Note: Stress-relieving may be required if a material is susceptible to
> stress corrosion cracking and post-weld
>
> heat treatment may be specified by the design code if the wall thickness is
> greater than a certain limit.
>
>
>
> & since we have no other options, we have to do the hot tap on the same,
> kindly advice WPS & PWHT procedures
>
>
>
> Thank all in advance..
>
>
>
> Regards
>
> Majdi Elyyan
>
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.