This standard applies to line pressure regulators, (see Part V, Definitions), hereinafter referred to as regulator(s), either individual or in combination with over pressure protection devices, hereinafter referred to as device(s), intended for application in natural gas piping systems between the service regulator and the gas appliance(s).
This standard applies to regulators classified in accordance with their intended application with reference to inlet and outlet pressures.
This standard applies to regulators and devices intended for use in one or more of the following mounting classifications (see 1.12-a): Upright - single position on a horizontal axis with respect to the inlet connection, as specified by the manufacturer. Horizontal - any position on a horizontal axis with respect to the inlet connection. Vertical - any position on a vertical axis with respect to the inlet connection. Limited Horizontal - any position from upright to 90 degrees (1.57 rad) from upright on a horizontal axis with respect to the inlet connection. Multipoise - any position on a horizontal, vertical or intermediate axis with respect ot the inlet connection. The tests specified herein shall be conducted with the regulator mounted in the manufacturer's specified upright position, unless otherwise specified herein. If the manufacturer specifies more than one mounting position, the tests in 2.7 shall be conducted in each mounting position. The data from these tests shall then be analyzed to determine the mounting position which produces the minimum outlet pressure and the mounting position which produces the maximum outlet pressure, based on results observed for the minimum outlet pressure setting of the regulator. (a) The tests in 2.8 shall be conducted in the mounting position which produces the minimum outlet pressure, as determined in 2.7. (b) The tests in 2.8 and 2.9 shall also be conducted in the mounting position which produces the maximum outlet pressure, as determined in 2.7.
The tests specified herein shall be conducted at a room temperature of 77 ± 10°F (25 ± 5.5°C). Regulators and vent limiters complying with the provisions of this standard shall be considered as having an operating temperature range of 32°F (0°C) to 125°F (51.5°C). At the option of the manufacturer, a greater operating temperature range may be specified, in which case additional tests as outlined in 2.4 and 2.10 shall be conducted.
If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.
All references to psi throughout this standard are to be considered gage pressures unless otherwise specified.