This British Standard specifies design parameters, materials and methods of installing pipe, in sizes not exceeding R1¼ (32 mm) for steel and DN 32 for corrugated stainless steel or DN 35 for copper, gas pipework, for the supply of 2nd family gas from the meter to appliances in domestic dwellings. The standard is also applicable to polyethylene pipe up to DN 32 that is exterior to a dwelling.
This standard applies to gas installation pipework where the nominal operating pressure is 21 mbar 1) .
