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[MW:28475] Re: Hot tap wps

By Materials & Welding
The clause demand for group qualification based on pipeline operating condition by the company. Here group refer to classification based on operations conditions rather than based on SMYS of the material. e.g. company separated the operation group based on the type of fluid inside, fluid temp & velocity, fluid pressure etc as these factorial change will impact the rate of weld cooling.

Now change in any of above condition based on group qualified shall be regarded as essential variable.
Hope it will help you.

Thanks & regards
Sandeep Kumar

On Thursday, October 18, 2018 at 2:51:21 PM UTC+3, puneeta...@gmail.com wrote:
Dear Experts,

We are actually in the process of making WPS for Hot Tapping . in this context while referring to API 1104 , unable to interpret the below paragraph from API 1104 In Service welding .

Kindly help in understanding

B.2.3.1.2 Pipeline Operating Conditions


For in-service welds, an increase in the severity of the pipeline operating conditions (in terms of weld cooling rates)
above the group qualified constitutes an essential variable.

Thanks in advance

Regards,

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