NASA-LLIS-0066

Lessons Learned - Dewar Vent Plumbing

contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T17:54:42Z
date available	2017-09-04T17:54:42Z
date copyright	03/26/1992
date issued	1992
identifier other	FHYCQCAAAAAAAAAA.pdf
identifier uri	http://yse.yabesh.ir/std/handle/yse/177820
description abstract	Description of Driving Event: A liquid helium dewar used to service payload experiments ruptured and damaged ceiling tiles and a copy machine. In order to service the payload experiments, the dewar converts normal liquid helium to superfluid helium. During this process, air was ingested into the vent line through a valve stem. The ingested air froze, forming a solid blockage. The failure analysis of the liquid helium dewar revealed that 4 of the 8 valves used in the system were not designed for use in vacuum systems.
language	English
title	NASA-LLIS-0066	num
title	Lessons Learned - Dewar Vent Plumbing	en
type	standard
page	2
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;1992
contenttype	fulltext
subject keywords	Cryogenic Systems
subject keywords	Packaging Handling Storage