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Hazardex 2017 Conference - Applying EI15 4th Edition at UK Airport Fuel Storage Sites

Author : Carolyn Nicholls - RAS

03 November 2016

The Energy Institute’s model code of safe practice part 15 (EI 15) acknowledges the lack of an industry agreed approach for the determination of when flammable mists are possible for releases of high flash-point materials (such as Jet A1).  This leaves hazardous area classification at airport fuel storage sites with some areas of uncertainty.  

This can lead to ‘blanket zoning’ of large areas of the site and ultimately impractical management of electrical equipment on site.  Without quantifying the formation of flammable mists, RAS Limited believe that it is possible to take a conservative approach to flammable mist generation that does not result in ‘blanket zoning’ of large areas of the site.  This approach is discussed and supported by examples taken from case studies.

Applying the EI15 standard is straight-forward as aviation kerosene (Jet A1) at UK airports fuel storage sites is imported, stored and exported at ambient temperatures.  Hazardous Area Classification for releases of Jet A1 is only required where mists or sprays are possible or releases can impact on hot surfaces, due to its high flash point (=38 °C) and the range of ambient temperatures experienced at UK airports.

The approach recommended by RAS Limited, and applied at a number of UK airport fuel storage sites, produces hazardous area classifications that result in increased flexibility to select, install, inspect and maintain electrical equipment on site.

About the Speaker

Carolyn Nicholls is a process safety specialist by training and a principal consultant with RAS Limited. She has been in the risk and hazard management industry for the last ten years. She leads the RAS teams of risk and hazard management consultants and has been instrumental in creating the company’s assessment methodologies.

Nicholls has experience of working with a number of UK airport fuel storage sites developing COMAH safety reports, in particular developing emergency response plans, evaluating the economic impact of safety improvements and reviewing operational controls.  Her particular area of interest is the demonstration of ALARP, an often misunderstood concept.


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