CSA B149.3-00

A.1 Scope

A.1.1

This Code contains the requirements, which include valve train diagrams, for fuel-related components and accessories and their assembly on an appliance utilizing gas, downstream of the manual shut-off valve specified in Clause 5.18.2 of CSA Standard B149.1.

A.1.2

This Code does not apply to (a) marine or pipeline terminals; (b) gas where used as a feedstock in petroleum refineries or chemical plants; (c) gas designated for storage or handling, or both, at liquefied petroleum gas bulk plants; (d) gas where used for natural gas for vehicles; (e) a new appliance for which there is an approved standard; (f) a manually operated appliance with an input not exceeding 20 000 Btuh used for industrial applications; and (g) other fuels used in combination with gas.

A.1.3

When another fuel is used in the installation and in combination with gas, the requirements for safe operation of that fuel should be acceptable to the authority having jurisdiction.

A.1.4

Requirements contained herein apply only to that portion of an appliance using gas as defined in Clause A.1.7, atmosphere gas an d reaction gas.

A.1.5

The requirements contained in this Code, including valve train diagrams, apply (a) to new noncertified appliances and equipment of all inputs for which there is no approved standard; (b) when the upgrading of an existing certified or noncertified appliance is required; and (c) to programmable logic controllers or microprocessor-based controls u sed for flame safety.

A.1.6

The requirements contained in this Code, including valve train diagrams, may be used to replace or supplement an approved sta ndard with the permission of the authority having jurisdiction.

A.1.7

When the term ""gas"" is used, the requirements of this Code, including the valve train diagrams, apply equally to and include any of the following gases, or mixtures of them: natural gas, manufactured gas, propane, propane air, propylene, butanes (normal butane or isobutane), and butylene.

A.1.8

The word ""shall"", when used in this Code, indicates a requirement unless approved otherwise by the authority having jurisdiction.

A.1.9

The values given in yard-pound units are the standard. The values given in parentheses are for information only.