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
Design Pressure:
Operating Pressure:
Design Temperature:
Operating Temperature:
Material:
Line Class:
10 BAR
4.5 BAR
215°C
15°C
SA-333 Gr 6
150
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.
Conclusion:
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.
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