A dispersion safety factor for LNG vapor clouds.

Area of Science:

• Chemical Engineering
• Energy Safety
• Environmental Science

Background:

• Increasing global reliance on liquefied natural gas (LNG) necessitates understanding associated storage and transportation risks.
• LNG spills present potential hazards requiring accurate risk assessment for safety protocols.

Purpose of the Study:

• To investigate the relationship between the lower flammability limit (LFL) distance and the visible contour of LNG vapor clouds.
• To introduce a new parameter, the dispersion safety factor (DSF), for quantifying LNG vapor cloud dispersion hazards.

Main Methods:

• Defined the dispersion safety factor (DSF) as the ratio of LFL distance to visible cloud contour distance.
• Developed two expressions for estimating the DSF based on spill scenarios.

Main Results:

• The study establishes a quantifiable relationship between LFL and visible vapor cloud dimensions.
• Proposed DSF expressions provide a method for estimating the extent of hazardous zones from LNG spills.

Conclusions:

• The dispersion safety factor (DSF) is a valuable metric for assessing the immediate danger of ignition and flash fire following an LNG spill.
• This parameter can enhance emergency response planning and safety measures for LNG handling operations.