Flange Surface Clamp

Client: Tengizchevroil

Problem Summary

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Anomaly Description:

A leak has been detected on the body flange of a vessel during gas regeneration process. The Vessel flanges had a diameter of 2700mm

Root causes:

A worn out flange gasket caused gas leak throuth the vessel body flanges.
Leak occurred when gas temperature increases in regeneration cycle.

Integrity concerns:

During regeneration cycle, gas temperature increases as well as its pressure causing process service to leak through the worn out flange gasket.
Since the process service is highly corrosive, its leakage would corrode the vessel flanges and bolting system.
Corrosion of the vessel flanges and bolting system would result in weakening of the vessel’s structural integrity followed by excessive leakage of a very flammabe and toxic process service.

Technical Details

Line Size:
Design Pressure:
Operating Pressure:
Design Temperature:
Operating Temperature:
Material:
Line Class:
N/A
4
1.45
440
150
A350 Gr LF2 / A 182 Gr F12
N/A
Flange 4
Flange 6

The Beruseal Solution

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A mechanical/surface clamp was designed according to ASME VIII Div 1 to enclose the space between the body flanges.
A polymer compound was then injected into the enclosed space between the flanges to stop and seal the leak.

Conclusion:

A successful tight seal was obtained by injecting polymer compound into the enclosed area between the vssel flanges.

Flange
Flange 5
Flange 3
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