Re: [MW:32044] In -service welding on HP Gas line, prior to Hot Tapping. Need immediate suggestions.

Pls. see that the isolated portion is made gas free & certificate from explosive inspector is obtained before doing any hot work or grinding. 

On Thu, 11 Mar 2021, 2:11 p.m. Ramzi Ben Ahmed, <ramzibenahmed14@gmail.com> wrote:

can you send us some picture about it

Le mer. 10 mars 2021 à 04:10, Venkatachalam Govindan <vinisaa@gmail.com> a écrit :

Dear Respected ones, 

We are planning a hot tapping on the HP gas line, which is 30" dia, and thickness 15mm, and carbon steel material. 

Around 15-meter length, where both the ends are closed by check valves. 

The line is isolated, we want to weld a 2" dia ventilate on the 30" pipe.

There is no flow is possible. We have to complete this work at any cost, the client says. Is this okay for you? it can be safe? 

Due to 15mm thickness, we are planning to do by 2.5mm, E 7018 electrode by the lower current. 

Please advise, any vapor cloud will be an issue inside the pipe? or we can do it because thick ness is high?  or shall we ask for at least a minimum flow so the vapor cloud will not be there. 

Looking sincerely your support friends. 

For your information, we regularly do such hot tapping works, at 800PSI pressure, but, with the flow. 04m/s. 

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Venkatachalam Govindan

QHSE Lead | Auditor | Trainer

(API U Trainer | IRCA Lead Auditor | Exemplar Global MS Specialist |CQI Practitioner)

Mobile +965-97604989

www.cgic.co.in E: info@cgic.co.in

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