scope:

This Specification sets out the product requirements for meter regulators and covers regulators for use with 2^nd family gas at flow rates not exceeding 6 m³ h^-1. Regulators to this Specification are suitable for a maximum operating pressure not exceeding 75 mbar and a maximum incidental pressure of 200 mbar. The operating temperature range of the regulators is -20°C to +60°C.

Sample regulators are subjected to a type test at a pressure of 350 mbar for gas tightness and lock-up.

The Specification applies to regulators with inlet and outlet connections in line or at right angles and threaded internally (Rc) to BS EN 10226. The type A regulator has inlet connection of Rc¾ and outlet connection of Rc¾ or 1" union to BS 746 with the axis of the outlet vertical. The type B regulator has an inlet connection of Rc¾ (this may be achieved using a reducing bush threaded Rc¾) and an outlet connection of Rc1 with the axes of both connections in the horizontal plane. The type C regulator has connections of Rc¾ with the inlet and outlet connections in line.

This Specification sets out the requirements for testing the product as follows:

• materials for corrosion resistance

• gas tightness, performance and mechanical life

• durability to mechanical stress

• during production.

This Specification requires consideration of the life cycle of the product and its potential effect on the environment.

All pressures quoted in this Specification are gauge pressures unless otherwise stated.

Italicised text is informative and does not represent formal requirements.

Appendices are informative and do not represent formal requirements unless specifically referenced in the main sections via the prescriptive terms "must", "shall" or "should".