Codes & Standards - Purchase
ANSI Z21.18-1995/CGA 6.3-M95 (R1999)
This standard also applies to negative gas appliance pressure regulators (see Part V, Definitions). The performance of negative pressure regulators is covered under Part III 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.
1.1.3 Regulators shall be classified in accordance with their intended application with reference to inlet pressures as follows:
Rated Inlet Pressure
1/2 psi (3.48 kPa)
2 psi (13.8 kPa)
5 psi (34.5 kPa)
1.1.4 Types of Application. This standard applies to regulators for the following general types of application:
(a) Main burner load application;
(b) Pilot burner load application;
(c) Main burner and pilot burner load application to control a minimum pilot flow rate of:
1. 0.15 cubit foot per hour (1.18 cm³/s), P, or
2. 0.50 cubic foot per hour (3.93 cm³/s), P; or
(d) Domestic range application (see 2.11).
1.1.5 Mounting Position(s). The manufacturer shall specify one or more of the following mounting classifications (see 1.12):
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 to 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 test 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 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 2.9 or 3.9 and 2.10 or 3.10 shall be conducted in the mounting position which produces the minimum outlet pressure, as determined in 2.8 or 3.8.
(b) The tests in 2.9 or 3.9 and 2.10 or 3.10 shall also be conducted in the mounting position which produces the maximum outlet pressure, as determined in 2.8 or 3.8.
1.1.6 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 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 2.1.3 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.
1.1.9 Exhibit A contains provisions that are unique to Canada.
1.1.10 Exhibit B contains a list of standards referenced in this standard, and sources from which these reference standards may be obtained.