Re: Re: [MW:28867] Re: Hot tap wps

Greetings,

Check 11.2.1 / 11.2.3 of 577 API RP and below link has very deep understanding to address the consequences / concerns of B.2.3.1.2 of 1104s API criticality in which and why it has been inlined to be mandated as essential.

(PDF) Temperature Prediction in Hot Tapping Process for High Pressure Pipeline. Available from: https://www.researchgate.net/publication/316961627_Temperature_Prediction_in_Hot_Tapping_Process_for_High_Pressure_Pipeline [accessed Jan 07 2019].

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From: Saidur Rahman

Date: 2019-01-06 08:35

To: materials-welding

Subject: Re: [MW:28866] Re: Hot tap wps

Hi All,

You can check API RP 2201 for Hot Tapping procedure.

Best regards,

Md Saidur Rahman, MASc

Deputy Manager (Operation)

Ashuganj Compressor Station

Gas Transmission Co. Ltd. (GTCL)

Contact: 01710553319; mdsaidur.rahman@ryerson.ca

On Sat, Jan 5, 2019 at 4:11 PM SARAVANAN KRISHNAN <saravweldingengineer@gmail.com> wrote:

Hi Puneet.

1. You can get the flow rate from the operation. (approximately) then will do the pqr with flow condition.or  if pqr already has done, follow the below steps. 

2. Based on the flow rate u can adjust the heat input value in the WPS( within the range).

3. while doing the hot tape parallel check the flow rate, current-voltage values,interpass temperature.

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K. SARAVANAN. ME (WELDING TECHNOLOGY)

     WELDING ENGINEER,

     DOHA, QATAR.

     MOBILE: +974-77466433. 

On Tue, Jan 1, 2019 at 1:14 PM Mohd Siraj <mohd52100@gmail.com> wrote:

it is a flow rate that you mentioned in WPS.

qualified PQR with severe condition where cooling rate is high and chances of burn through is high.

that's meaning.

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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