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Andrew W. Sloley

VECO USA, Inc. (current affiliation)
1313 Bay St
Bellingham, WA 98229 360-676-1500

Published in
Hydrocarbon Online: Tech Talk
11 January 2001

Abstract copyright Andrew W. Sloley
All rights reserved

Foam is a major source of column operating problems. With foam, the level in the sight glass is lower than the level inside the tower. As the foam level inside the tower increases, the difference between the foam level and the height of the sight increases. Finally, the foam level rises above the upper level tap.

Once the foam rises above the upper level tap, the DP across a DP cell reports the average liquid density across the distance times the height. The DP only changes when liquid density. Sight glasses only show changes of average density across the sight glass taps. Liquid or foam can back up the tower all the way to the overhead vapor line and a sight glass still shows a liquid level and a DP cell level controller shows a liquid level.

7 pages.
Electronic version available in Adobe Acrobat PDF format file 090.PDF 349k.

Request paper 090.

This page updated 19 January 2005.
© 2005 Andrew W. Sloley. All rights reserved.