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Liquid-Nitrogen Test for Blocked TubesNondestructive test identifies obstructed tube in array of parallel tubes. Trickle of liquid nitrogen allowed to flow through tube array until array accumulates substantial formation of frost from moisture in air. Flow stopped and warm air introduced into inlet manifold to heat tubes in array. Tubes still frosted after others defrosted identified as obstructed tubes. Applications include inspection of flow systems having parallel legs.
Document ID
19830000382
Document Type
Other - NASA Tech Brief
Authors
Wagner, W. R. (Rockwell International Corp.)
Date Acquired
August 11, 2013
Publication Date
April 1, 1984
Publication Information
Publication: NASA Tech Briefs
Volume: 8
Issue: 1
ISSN: 0145-319X
Subject Category
MECHANICS
Report/Patent Number
MFS-19762
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.