IGE/SR/25 Edition 2 (Communication 1748) Hazardous area classification of Natural Gas installations

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Provides a procedure for hazardous area classification around installations handling Natural Gas.

Recommendations take a pragmatic approach to the determination of safe dispersion distance and present the results in the form of tables. There is no need to consider differences in gas composition or temperature and it is not necessary to determine the flow rate that coincides with the peak distance. Addressing both ideal and non-ideal venting, and enclosures that have, respectively, adequate; less than adequate and poor ventilation.

IGE/SR/25 can be applied to any Natural Gas installation but it is primarily for installations upstream of the emergency control valve. Recommendations are often applied to other installations for which standards such as IGE/GM/7 (meter installations) cannot be applied owing to the non-standard nature of the installation.

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