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Hazards Associated With the Spillage of Liquefied Natural Gas on Water.

Burgess-DS; Murphy-JN; Zabetakis-MG
NTIS: PB 196 602 :22 pages
An investigation of the hazard of spillage of liquefied natural gas (lng) onto water is described. About 2,000 gallons of lng were consumed in various tests. The initial vaporization rate of lng following spillage was found to be 0.037 Lb ft2 sec; when the spill was confined, this vaporization rate was moderated after about 20 seconds by the growth of an ice layer on the water surface; when the spill was unconfined, a coherent ice floe was not observed and the vaporization rate was essentially time independent. The maximum diameter (in feet) of the spreading lng pool was found to be given by 6.25 W0 1/3, where w0 is the weight of lng in pounds. Downwind of a natural gas source, time-averaged methane concentrations were given in good approximation by standard air pollution equations. However, peak concentrations were as much as twentyfold higher than average, adding an additional factor to the assessment of hazard. The effect of layering by the cold vaporized natural gas was similar to the effect of a temperature inversion on normal gases in the atmosphere. Small-scale explosions were observed on pouring lng onto a water surface; no single explanation seems pertinent to all of the incidents observed.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7448
NIOSH Division
Source Name
NTIS: PB 196 602
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division