Hi,
Hot tap is very frequently applied on pipelines and piping carrying hydrocarbons. Hydrocarbons are flammable, explosive. Traces of hydrocarbons can easily introduce flames and fires. Hence safe operating procedures, knowledge base of personnel frequently doing this work are important. You need to check with your operations personnel on the best and safest way for hot tapping.
API 2201 provides exhaustive information on Hot Tapping. In fact, its' the industry document for his technique of "in situ alterations/ modifications in pipelines. There're many checklists, points to be considered for safe hot tapping work. I've attached some extracts and highlighted texts from this document.
It's advisable to avoid any flow of gases/ hydrocarbons during hot tapping.
I hope the attached information would be of help.
Thanks.
Pradip Goswami.P.Eng, IWE.
Independent & Consulting Welding & Metallurgical Engineering Specialist
Saudi Aramco Approved Designated Welding Engineer(DPWR)
Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/
Email:pgoswami@rogers.com,pradip.goswami@gmail.com
Cell/Whasapp:1-905-9793232
From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> On Behalf Of Venkatachalam Govindan
Sent: March 9, 2021 8:18 AM
To: materials-welding@googlegroups.com
Subject: [MW:32036] In -service welding on HP Gas line, prior to Hot Tapping. Need immediate suggestions.
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? – You need to have a check of any remaining gases, vapor, with Tracers
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.
--
Venkatachalam Govindan
QHSE Lead | Auditor | Trainer
(API U Trainer | IRCA Lead Auditor | Exemplar Global MS Specialist |CQI Practitioner)
Mobile +965-97604989
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https://materials-welding.blogspot.com/
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