In-Service Welding

for Oil & Gas Pipelines, and Plants.

ION PRO Services provides a wide range of qualified in-service welding procedures based on API 1104 Appendix B or ASME IX acceptance criteria.

Hot Tap and Line Stop In-Service Welding Services


Stainless Steel and Carbon Steel


B, X42, X52, X60, X65 and X70

Pipeline Size

Up to 48” in diameter

Our Recent In-Service Welding Projects

What to expect during every project?

  • Highly qualified welders
  • Fast quoting process
  • Perfect safety record
  • Efficient data sheet process
  • ASME IX and API 1104 Appendix B Compliant

We’re ready to work.

Choose ION PRO Services for Your Next Pipeline In-Service Welding Project

At ION PRO Services, our welders have extensive experience across the globe to safely perform in-service welds in the most demanding conditions.

  • Pipeline material up to and including X70
  • In-service welding of welded repair sleeves (Type A or B)
  • In-service welding of hot tap and line stop fittings
  • On-site safety analysis

Additionally, we provide PRCI Thermal Analysis Modelling on request.

Our focus is to execute the right plan to produce desired results our clients are looking for. Rest assured; you are in safe hands with ION PRO.


We are responsive to your requests and value your questions. ION PRO Services has proudly served clients seeking turnkey hot tap and line stop services as qualified experts with precision and excellence, with extensive experience in the industry.

What are the risks associated with in-service welding?

The primary risks are burn-through and hydrogen assisted cold cracking and secondary risks would include weld failure, which could possibly be remedied upon discovery.

What is burn-through?

This is when the unmelted pipe wall beneath the weld pool does not have sufficient elevated temperature strength to contain the pressurized product inside the pipeline.

How is the risk of burn-through mitigated?

Burn-through risk is affected by many factors and not a single factor, but in broad terms one should consider pipe wall thickness, weld penetration heat input and operating conditions.

What are the NDE requirements for in-service welding?

Prior to starting the weld, the pipe section where the weld will take place is subject to UT examination to determine the pipe wall thickness.

Once the welds are done on the fitting or repair sleeve, there is an NDT hold period, anywhere between 12 to 24 hours, depending on the specific company requirements and thereafter the welds are subjected to MPI testing.

There are purists who support the notion of a hot MPI test on each completed run, but this is generally not applied.

What type of electrodes are used for in-service welding?

One of the risk factors in hydrogen assisted cold cracking and hydrogen in the weld is one of three risk factors that must be addressed.

One way this is done is to use a low-hydrogen electrode for all in-service welding requirements.

What are the applicable codes covering in-service welding?

Mainly API 1104 Appendix B is used, considering the requirement for simulation of an in-service weld.

Contact Us

21233 FM 529,
Cypress, Texas, USA, 77433-5139

phone number
+1 (832) 674-4096