Hot Tap welding Procedure -Welding Code

[sandeep k sreedhar]

Dear Experts

Greetings!

I have hot tap welding in my scope of work, According to  P&ID the hot tap is coming under the design code B31.3. 

The Hot tap welding requirement are as follows as per the client specification- ADNOC Group.

The CONTRACTOR/VENDOR shall follow procedures and qualifications specified in DGS 6300-001- WELDING AND NDE OF PIPING SYSTEM (Based on Section IX) for On-Plot Piping and DGS 6300-004- Welding and NDE of pipeline  for Off-Plot Piping- .

Welders shall be qualified in accordance with DGS 6300-001 for On-Plot Piping and DGS 6300-004 for Off-Plot Piping. 

For Off-plot pipelines, both the procedure and the welders should be qualified using a full-scale simulation of the connection, in accordance with API 1104 or equivalent COMPANY‟S specification. 

All the Hot tap sub contractor's proposing API 1104 based WPS since considering the service welding requirement.

Now I am confused which welding code has to be followed. Request for yours  kind advise on the same.

Regards

SANDEEP K SREEDHAR

[Raghuram Bathula]

Assuming its piping (not pipeline), you need to follow piping requirements. however these are General specifications for welding, check there should be project specification for hot tapping, discuss with your client

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[Paidi]

"According to  P&ID the hot tap is coming under the design code B31.3." , So you must follow the WPS which is related  to on plot piping .                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

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Thanks  & Best Regards,

Suresh Paidi

 

[sandeep k sreedhar]

Thank you for your replies, but when we are using onplot piping wps the in service requirements are not covered in the section IX. could you please advise on this matter?

Regards

sandeep K Sreedhar

SANDEEP K SREEDHAR

00971565359349

[Sureshkumar Pethureddy]

Dear sandeep

The execution of "hot-tap" branch connections onto piping systems and pipelines containing hydrocarbons under operating conditions. It has been developed to reflect current understanding of the technology and to improve safe practices in the field. It is intended to cover hot-tapping on carbon, carbon-manganese and high-strength low-alloy steels.

Due to the distinction made in the relevant standards between on-plot piping and off-plot pipelines or flow lines, a similar distinction is sometimes made within but this has been avoided wherever possible. Additionally, it is assumed that the piping systems are designed and operated in accordance with ASME B31.3 and pipeline systems are designed and operated in accordance with ISO 13623, ASME B31.4, or ASME B31.8, or a combination.

.WPS Welding procedure specification

NOTE: Some parts of a pipeline system, although physically located "off-plot", may be designed in accordance with ASME B31.3. For the  purposes of piping shall be considered to be on-plot. Similarly, some refinery piping, although physically located "on-plot", may be designed in accordance with ISO 13623, ASME B31.4 or B31.8. such piping shall be considered to be off-plot.

Regards

suresh

[Paidi]

Dear Sandeep, 

Generally hot tap specification will be provide by client or project management as it is followed case by case . So please you have to discuss with client. 

Client may ask for Mock up If its cryogenic or critical level ...you have to follow the things carefully 

With regards

Suresh 

[pradip kumar Sil]

Follow B-31.3 as per design code

[Leonardo Gracia]

Take into account API RP 2201 “Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries”

BR