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The IGEM standard IGEM/UP/16 entitled 'Design for natural gas installations on industrial and commercial premises with respect to hazardous area classification and preparation of risk assessments', is intended to provide basic design information to enable designers and those undertaking risk assessments to achieve a gas installation that can be classified and maintained as Zone 2 Negligible Extent (Zone 2 NE).
It is primarily for designers of new industrial and commercial pipework systems, downstream of the primary gas meter installation. It will also be useful for site occupiers who have the responsibility for compliance with DSEAR and for the production of site risk assessments for existing systems and new installations. Hazardous area assessment is normally a specialist activity requiring the application of IGEM/SR/25 Edition 2.
The standard covers new gas installation pipework, controls and associated gas appliances including appliance connections and pipework with an OP not exceeding 2 bar installed downstream of the primary meter installation in industrial and commercial premises. It may also apply to parts of common pipework within multi-occupancy domestic premises; for example, between pipework risers downstream of the meter installation and also to the central boiler plant. For hazardous area analysis of installations outside the scope of the Standard, reference should be made to IGEM/SR/25 Edition 2.
The advice on the preparation of risk assessments assumes that industrial and commercial gas installations and pipework have been designed, installed, commissioned and operated according to recognised standards such as IGEM/UP/2 and IGE/UP/10. These assessments determine whether electrical equipment marked and declared as being suitable for use in a hazardous area are considered or used or if controls are required over other potential ignition sources such as hot surfaces, flames or sparks.
The standard will not purport to cover every gas installation as the diversity of gas installations is such that it is inappropriate to provide detailed requirements for all types of installation. It is recognised that special circumstances may occur, on an installation, for which some of the requirements will not, necessarily, be appropriate. In such cases, methods need to be developed by personnel of adequate competency and experience.