How to change a level glass of a Level gauge

Following steps to be taken to change the glass:

1. Isolate the level gauge from process from HP and LV valve.
2. Drain the level gauge process fluid from drain isolation valve.
3. Insure no leakage occurred from HP and LP valves.
4. Remove the all U-Clamp bolt and removed the glass and gasket and make smooth the surface of chamber and cover flange surface.
5. Fix the sealing gasket after some grease applied on chamber window surface. By applying the grease it is easy net time to remove the gasket on next time.
6. Fix the mica sheet in case of transparent glass.
7. Fix the glass then fix cover flange and cushion gasket then fix the U-Clamp and bolt .
8. Tighten the bolt in cross direction. Never tighten the bolt in one direction if tight the glass one direction then possibility to break the glass.
9. Tighten the all U-clamp bolt equally.

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