M00050919
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CSA 3.8-2014 (R2019) Gas-Fired Equipment for Drying Farm Crops
standard by CSA Group, 10/01/2014
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CSA 3.8:14
October 2014
Title: Gas-fired equipment for drying farm crops
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CSA 3.8:14
Interprovincial Gas Advisory Council
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Approved on September 9, 2014 by IGAC Effective in Canada June 1, 2016 Published in October 2014 by CSA Group
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CSA 3.8:14 Gas-fired equipment for drying farm crops
CSA Technical Committee on Gas Appliances and Related Accessories 3
Interprovincial Gas Advisory Council 5
Technical Subcommittee on Gas Operated Agricultural Equipment 7
Preface 8
Scope 9
Reference publications 10
Definitions 13
Construction 17
General 17
Assembly 20
Accessibility 20
Combustion air and ventilation 21
Main burners 22
Primary air adjustment means 23
Combustion air adjustment means 24
Orifices and orifice fittings 25
Automatic gas ignition systems 25
Flame spreaders 29
Valve trains 29
Manual gas valves 29
Gas supply lines 30
Additional requirements for liquid propane valve trains 35
Bleeds and vents 36
Automatic gas valves 37
Hydrostatic relief valve 38
Input flow control systems 38
Gas appliance pressure regulators 38
Adjustment of minimum input rating 40
Pilots and pilot lines 40
Operating and limit controls 43
Thickness of materials 44
Motors 46
Fans 47
Air filters 47
Integral vaporizers for direct-fired application 47
Instructions 47
Marking 51
Electrical 54
Programmable controllers 55
Protection of service personnel 55
October 2014 © 2014 Canadian Standards Association 1
CSA 3.8:14 | Gas-fired equipment for drying farm crops | |
5 Performance | 57 | |
| 57 | 60 |
Test pressures and burner adjustments 60
Basic test arrangement 61
High temperature limit control system 61
Airflow sensing systems 61
Operating temperature control system 63
Burner operating characteristics 64
Burners and safety shutoff devices 65
Piloted ignition systems 67
Direct ignition systems 69
Gas appliance pressure regulators 71
Automatic valves 71
Main burner and flame spreader temperatures 72
Nonload-bearing combustion gas baffle temperatures 73
Manifold and control assembly capacity 74
Power interruption 74
Wall, floor (optional), ceiling, electrical equipment, and wiring temperatures 75
Rain test 78
Wind test 80
Rain and wind tests for inlet air openings 81
Burner durability 82
Electrical tests 82
Marking material adhesion and legibility 83
6 Manufacturing and production tests 84
Annex A (normative) — Items unique to Canada 86
Annex B (informative) — Maximum allowable temperatures for materials 88 Annex C (informative) — Guidelines for fuel air ratio control (FARC) systems 90 Annex D (Informative) — Pertinent references to ANSI Y14.15 93
Annex E (Informative) — Wire color designations 94
Annex F (Informative) — Recommended wire color usage 95
Annex G (informative) — Preferred graphic symbols of commonly used items, extracted from standard ANSI/IEEE 315, Graphic symbols for electrical and electronics diagrams, and abbreviations for these items 96
Annex H (informative) — Table of conversion factors 98
Annex I (informative) — Pipe train diagram 101
October 2014 © 2014 Canadian Standards Association 2
CSA 3.8:14 Gas-fired equipment for drying farm crops
This is the sixth edition of CSA 3.8, Gas-Fired Equipment for Drying Farm Crops. It supersedes the previous editions published in 1999, 1986, 1977, 1972, and 1968.
This Standard was prepared by the Z83/CSA Joint Technical Advisory Group on Gas Operated Agricultural Equipment, under the jurisdiction of the Technical Committee on Gas Appliances and Related Accessories and the Strategic Steering Committee on Standards for Fuel Burning Equipment, and had been formally approved by the CSA Technical Committee, and the Interprovincial Gas Advisory Council.
Interpretations: The Strategic Steering Committee on Standards for Fuel Burning Equipment has provided the following direction for the interpretation of standards under its jurisdiction: “The literal text shall be used in judging compliance of products with the safety requirements of this Standard. When the literal text cannot be applied to the product, such as for new materials or construction, and when a relevant committee interpretation has not already been published, CSA Group's procedures for interpretation shall be followed to determine the intended safety principle.”
Notes:
Use of the singular does not exclude the plural (and vice versa) when the sense allows.
Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.
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October 2014 © 2014 Canadian Standards Association 8
CSA 3.8:14 Gas-fired equipment for drying farm crops
CSA 3.8:14
1 Scope
1.1
This Standard 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.
1.2
Dryers covered under this Standard are for use:
with natural gas; and
with propane in the liquid and vapour phase.
1.3
This Standard applies to dryers intended for outdoor use only.
1.4
This Standard is limited to dryers that are equipped with forced draft burner(s), which relies on combustion air supplied by a mechanical device such as a fan or blower.
1.5
The construction of dryers for use with the above mentioned gases is covered under Clause 4.
1.6
The performance of dryers for use with the above mentioned gases is covered under Clause 5.
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.
October 2014 © 2014 Canadian Standards Association 9