CSA 3.8-14:2019 pdf download.Gas-fired equipment for drying farm crops
1.1 CSA 3.8-14 applies to newly produced direct gas-fired crop dryers of the recirculating or non recirculating type hereinafter referred to as "dryers" , whose primary purpose is to provide process heating to dry farm crops. These dryers are used in non-occupied spaces and are constructed of non-combustible materials having input ratings of 12,500,000 Btu/hr (3 663 389 W) or less, constructed entirely of new unused parts and materials.
This Standard refers to equipment in which heated air is used to reduce the moisture content of farm crops.
The installation is to conform with local codes, or in the absence of local codes, in accordance with the Natural Gas and Propane Installation Code, CSA B149.1, and the Propane Storage and Handling Code,CSA B149.2.
This Standard is intended to cover complete dryers with integral air moving components, i.e., those which are designed by, catalogued by, and built on a repetitive basis by the manufacturer and those in which the dryer and air moving components are tested as an assembly and available for separate sale.
1.9 This Standard contains SI (Metric) corresponding to the yard/ pound quantities, the purpose being to allow the standard to be used in SI (Metric) units. (Standard for use of the International System of Units (SI): The Modern Metric System, IEEE/ASTM SI 10 or ISO 80000-1:2009 Quantities and units - Part 1:General are used as a guide in making metric conversion from yard/pound quantities.) If a value for a measurement and a corresponding value in other units are stated, the first stated value is to be regarded as the requirement. The given corresponding value may be approximate. If a value for a measurement and a corresponding value in other units are both specified as a quoted marking requirement, the first stated unit, or both shall be provided.
Automatic一an automatic or semiautomatic device consisting essentially of a valve and operator that controls the gas supply to the burner(s) during normal operation of an appliance. The operator may be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means, or by other means.
Internal relief valve一a pressure relief valve that is built into the body of the diaphragm assembly of a pressure regulator to ensure that, in the event of a primary pressure regulator malfunction, the pressure downstream of the relieving point does not exceed that of the lowest-pressure-rated component in the system.
Line relief valve一a relief valve installed in the piping or tubing system downstream of a final-stage pressure regulator that is not equipped with an internal relief valve to ensure that in the event of a primary pressure regulator malfunction, the pressure downstream of the relieving point does not exceed that of the lowest pressure rated component in the system.CSA 3.8-14 pdf download.