3/4″ T-Piece Clamp with Strongback

Problem Summary

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Anomaly Description:
A steam leak was discovered from welding on the T-Piece.

Root causes:
The leak was caused by a crack on the welding. The pipe was also reported to have an extremely low remaining wall thickness (through-wall).

Integrity concerns:
The pipe was in a critical condition due to the lowest remaining wall thickness (through-wall).
Due to the remaining wall thickness (through-wall), the pipe could suddenly rapture/fail anytime, therefore, the integrity of the piping was a major concern.

Technical Details

Line Size:
Design Pressure:
Operating Pressure:
Design Temperature:
Operating Temperature:
Material:
Line Class:
3/4″
10 BAR
4.5 BAR
215°C
150°C
SA-333 Gr6
150
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The Beruseal Solution

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Clamp Design:
A T-piece clamp was designed according to ASME VIII Div 1 to cover the entire T-piece pipe section including the cracked welding. A strongback system was also designed to keep the clamp in place should there be a complete failure of the cracked weld. The strongback system also adds structural integrity to the piping since the remaining wall thickness is extremely thin (below minimum acceptable thickness).

Seal:
A successful seal was obtained by injecting a polymer compound into a sealing groove that runs throughout the seem and bores of the enclosure.

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