Testing of a vacuum insulated flexible line with flowing liquid nitrogen during the loss of insulating vacuum

J. A. Demko, R. C. Duckworth, M. Roden, M. Gouge

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Long length vacuum insulated lines are used to carry flowing liquid nitrogen in several high temperature superconducting cable projects. An important, but rare, failure scenario is the abrupt or catastrophic loss of the thermal insulating vacuum producing a rapid increase in heat transfer to the liquid nitrogen stream. In this experimental investigation, a vacuum superinsulated 3 inch by 5 inch nominal pipe size (NPS) (88.9 mm by 141.3 mm) flexible cryostat is subjected to an abrupt loss of vacuum in order to measure the thermal response of a flowing liquid nitrogen stream and the temperature response of the cryostat. The measured outlet stream temperature has a slight peak shortly after the loss of vacuum incident and decreases as the cryostat warms up. The heat loads measured before and after the vacuum loss event are reported. Measurements of the temperatures in the multi-layer superinsulation are also discussed.

Original languageEnglish
Title of host publicationAdvances in Cryogenic Engineering - Transactions of the Cryogenic Engineering Conference - CEC
Pages160-167
Number of pages8
DOIs
StatePublished - 2008
EventTransactions of the Cryogenic Engineering Conference, CEC 2007 - hattanooga, TN, United States
Duration: Jul 16 2007Jul 20 2007

Publication series

NameAIP Conference Proceedings
Volume985
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceTransactions of the Cryogenic Engineering Conference, CEC 2007
Country/TerritoryUnited States
Cityhattanooga, TN
Period07/16/0707/20/07

Keywords

  • Cryogenics
  • Low temperature equipment
  • Refrigerators
  • Superconducting cables

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