This Standard specifies materials, design, construction, installation, testing and maintenance requirements for below ground plastics gas distribution networks and shall be used in conjunction with AS/NZS 4645.1, for the distribution of fuel gas suitable for domestic, commercial or industrial uses, where—

(a) plastics gas distribution networks include those constructed from materials including polyamide (PA), polyethylene (PE) and polyvinyl chloride (PVC-HI); and

(b) the MAOP of the gas distribution network is not greater than 700 kPa except for plastics mains and services with a DN greater than 200 mm where the MAOP is limited to 600 kPa.

NOTES:

1 The diameter and pressure limitations are to limit potential consequences from failure in those systems.

2 Although Standard is restricted to less than 700 kPa, sections of this Standard may be useful as guidance for plastics systems with an MAOP greater than 700 kPa. The relevant statutory authority may regard this Standard as appropriate for other than fuel gas.