This Standard sets out requirements for over-pressure and under-pressure shut-off devices up to 150 mm nominal bore (DN 150) for use on naturai gas (NG). simulated natural gas (SNG), town gas (TG),tempered liquefied petroleum gas (TLP) and liquefied petroleum gas (LPG) intended to be ftted in the gas supply downstream of the consumer billing meter or an LPG first stage pressure regulator.
The requirements apply to over-pressure and under-pressure shut-off devices intended for installation into consumer piping either directly or as part ofa gas pressure regulator.
NOTE 1 Over-pressure shut off devices generally serve to protect equipment downstream of regulators from being pressurized beyond its rated working pressure if the regulator flls.
