DEFINITIONS

Inlet Pressure, Rated :
The highest inlet pressure for which the control is intended to be used.
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Overpressure Protection Device :
For the purposes of this standard, a device which under abnormal conditions will act to reduce, restrict or shut off the supply of gas flowing into a system to prevent gas pressure in that system from exceeding 2 psi (13.8 kPa).
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Line Pressure Regulator :

A gas pressure regulator intended for installation in a building gas distribution system between the building service regulator or LP-gas 2 psi service regulator and gas utilization equipment.

For purposes of this standard, a line pressure regulator is rated for an inlet gas pressure of either 2, 5, or 10 psi (13.8, 34.5, or 68.9 kPa) and is designated as either Class l or Class ll as follows:

• Class l - Maximum outlet pressure of 1/2 psi (3.5 kPa)
• Class ll - Maximum outlet pressure of 2 psi (13.8 kPa)

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Ventilated Space:

A space where there is an air change by means of natural ventilation or mechanical means, or where the space communicates with the rest of the structure by means of permanent openings.

Note: A 13A39 vent limiter can only be used with natural gas when used with a 5 psi system.

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Vent Limiter:

A means which limits the flow of gas from the atmospheric diaphragm chamber to the atmosphere in the event of a diaphragm rupture. This may be either a limiting orifice or a limiting device.

Limiting Orifice Type: A vent limiter where the flow through the limiter is the same in both directions.
 
 
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