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Acceptable leak rate - CDU column

Acceptable leak rate - CDU column

Acceptable leak rate - CDU column

(OP)
Dear all

Does anybody have idea of acceptable leak rate for partial draw of tray?

Tray is for light gas oil and puparound drawing. Rate of LGO is about 80m3/h and 400m3/h for PA. Column is 6m diameter. Tray has two chimneys and two overflow weirs 1.5m high.

Regards

RE: Acceptable leak rate - CDU column

In a draw off tray the drop in water level shall not exceed 25mm in 5 minutes.

RE: Acceptable leak rate - CDU column

Does the previous statement apply for all mounted chimney/partial draw-off trays?

What should be the initial water level, before the leak test is going to start? The maximum one, 50% of max. level, or something else? Where can we find standardized procedure for tray leak testing?

RE: Acceptable leak rate - CDU column


The usual leak test procedure for draw-off trays is as fallows:
 
Block drain holes with putty.
Fill with water (check water quality - maximum chlorides).
Mark water level (above 50%) and leave for 30 minutes; level shall not drop by more than 50 mm, unless otherwise specified.
Allow water to drain and check flow (slope of gutters/trough).
Remove all putty from drain holes.
Check cleanliness and arrange acceptance.

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