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Predicting triggering and consequence of delayed LNG RPT

Abstract

We develop a model for delayed rapid phase transition (RPT) in LNG spills based on thermodynamics and nucleation theory which includes predictions of both triggering and vapor explosion consequence. We discover that the model predictions can be accurately characterized by two independent parameters alone: The initial fraction of methane and the molar mass of the remaining non-methane part. Based on this we develop correlations for risk assessment which may be used without access to the underlying advanced algorithms, and we give practical advice for risk mitigation. The model is consistent with an often reported empirical triggering criterion for cryogen RPT. We show that spilled LNG must typically boil down to about 10–20% of the original amount before RPT may occur, and after triggering one may expect energy yields of 10–20 g TNT per kg of triggered LNG. Explosive pressures in the range 20–60 bar can be expected.
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Category

Academic article

Language

English

Author(s)

  • Eskil Aursand
  • Morten Hammer

Affiliation

  • SINTEF Energy Research / Gassteknologi
  • Norwegian University of Science and Technology

Year

2018

Published in

Journal of Loss Prevention in the Process Industries

ISSN

0950-4230

Volume

55

Page(s)

124 - 133

View this publication at Norwegian Research Information Repository