3/4″ T-Piece Enclosure and Restraint

Client: Tengizchevroil

Problem Summary


Anomaly Description:
Through hole found in T-piece welding resulting in steam leak.

Root causes:
Internal corrosion and possible welding defect on the T-Piece weld.

Integrity concerns:
Further deterioration of weld could result in separation of the T-piece from the piping, this could have resulted in possible shutdown of equipment and production loss.

Technical Details

Line Size:
Design Pressure:
Operating Pressure:
Design Temperature:
Operating Temperature:
Line Class:
10 BAR
4.5 BAR
SA-333 Gr  6
3.4in er 4
3.4 in er 3

The Beruseal Solution


Because there is a possibility of a complete weld failure, a strongback system had to be put in place to keep the system intact in the event that failure of the weld occurs. Space below the T-piece enclosure was very limited and Beruseal devised a plan to design a restraint that would go around the larger diameter pipe and tie in together with the enclosure.

A polymer compound was injected into a sealing groove to avoid sealant entering the line through the defect. A safe and successful repair was implemented that allowed the client to operate at full capacity until the next planned shutdown.

3.4in er 2
3.4in er
3.4in er 4

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