ANSI Z21.18:2000 pdf free download – GAS APPLIANCE PRESSURE REGULATORS
1.1 SCOPE
1.1.1 Types of Regulators. This standard applies to individual gas appliance pressure regulators, which are not a part of a combination control (see Part V, Definitions), constructed entirely of new, unused parts and materials, hereinafter referred to as regulators, intended for application on individual gas apliances, This standard also applies to negative gas appliance pressure regulators (see Part v, Definitions). The performance of negative pressure regulators is covered under Part m of this standard. Compliance of a device with this standard does not imply that such device is acceptable for use on gas appliances without supplemental tests with the device applied to the particular appliance design. Components performing functions other than those of a gas appliance pressure regulator shall comply with the applicable American National Standards,
1.1.2 Types of Gases. This standard applies to regulators for operations with natural, manufactured and mixed gases, liquefied petroleum gases and LP gas- air mixtures.
The test 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 2.8 or 3.8, as applicable, shall be conducted in each mounting position. The data from these tests shall then be analyzed to determnine the mounting position which produces the minimum outlet pressure with the minimum outlet pressure setting (if adjustable), and the mounting position which produces the maximum outlet pressure with the maximum outlet pressure setting (if adjustable). These two mounting positions shal be designated Position A and Position B, respectively.
1.1.6 The tests specified herein shall be conducted at a room temperature of 77±10°F (25±55°C). Regulators and vent limiters complying with the provisions of this standard shall be considered as having an ambient temperature range of 32°F (0°C) to 125°F (51.5°C). At the option of the manufacturer, a greater ambient temperature range may be specified, in which case additional tests as outlined in 2.1.2 and 2.13 shall be conducted.
1.1.7 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.
1.1.8 All references to“psi”throughout this standard are to be considered gage pressures, unless otherwise specified.
1.4.5 When for connection to semi-rigid tubing, the connection, together with the fttings used thereon shall be in accordance with or be interchangeable with the fttings described in Volume 1- Materials, SAE Handbooks, or equivalent.
1.4.6 Standard fange connections, when provided, shall be constructed in accordance with the dimensional specifications for 125-b cast-iron fanges of the Standard for Cast ltron Pipe Flanges and Flanged Fittings, Class 25, 125, 250, and 800, ANSUASME B16.I. (See Figure 1.)