CSA 3.8:14

(reaffirmed 2019)

Gas-fired equipment for drying farm crops

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  Standards Update Service

  CSA 3.8:14

  October 2014

  
  

  Title: Gas-fired equipment for drying farm crops

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CSA 3.8:14

Gas-fired equipment for drying farm crops

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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ISBN 978-1-77139-619-6

© 2014 Canadian Standards Association

All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.

CSA 3.8:14 Gas-fired equipment for drying farm crops

Contents

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

1. Scope 9

   
   

2. Reference publications 10

   
   

3. Definitions 13

   
   

4. Construction 17

   1. General 17

   2. Assembly 20

   3. Accessibility 20

   4. Combustion air and ventilation 21

   5. Main burners 22

   6. Primary air adjustment means 23

   7. Combustion air adjustment means 24

   8. Orifices and orifice fittings 25

   9. Automatic gas ignition systems 25

   10. Flame spreaders 29

   11. Valve trains 29

   12. Manual gas valves 29

   13. Gas supply lines 30

   14. Additional requirements for liquid propane valve trains 35

   15. Bleeds and vents 36

   16. Automatic gas valves 37

   17. Hydrostatic relief valve 38

   18. Input flow control systems 38

   19. Gas appliance pressure regulators 38

   20. Adjustment of minimum input rating 40

   21. Pilots and pilot lines 40

   22. Operating and limit controls 43

   23. Thickness of materials 44

   24. Motors 46

   25. Fans 47

   26. Air filters 47

   27. Integral vaporizers for direct-fired application 47

   28. Instructions 47

   29. Marking 51

   30. Electrical 54

   31. Programmable controllers 55

   32. Protection of service personnel 55

October 2014 © 2014 Canadian Standards Association 1

1. Test pressures and burner adjustments 60

2. Basic test arrangement 61

3. High temperature limit control system 61

4. Airflow sensing systems 61

5. Operating temperature control system 63

6. Burner operating characteristics 64

7. Burners and safety shutoff devices 65

8. Piloted ignition systems 67

9. Direct ignition systems 69

10. Gas appliance pressure regulators 71

11. Automatic valves 71

12. Main burner and flame spreader temperatures 72

13. Nonload-bearing combustion gas baffle temperatures 73

14. Manifold and control assembly capacity 74

15. Power interruption 74

16. Wall, floor (optional), ceiling, electrical equipment, and wiring temperatures 75

17. Rain test 78

18. Wind test 80

19. Rain and wind tests for inlet air openings 81

20. Burner durability 82

21. Electrical tests 82

22. 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

Preface

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:

1. Use of the singular does not exclude the plural (and vice versa) when the sense allows.

2. 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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4. This Standard is subject to periodic review, and suggestions for their improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to inquiries@csagroup.org and include “Proposal for change” in the subject line:

   1. Standard designation (number)

   2. relevant clause, table, and/or figure number;

   3. wording of the proposed change; and

   4. rationale for the change.

5. To submit a request for interpretation of this Standard, please send the following information to

6. inquiries@csagroup.org and include “Request for interpretation” in the subject line:

   1. define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;

   2. provide an explanation of circumstances surrounding the actual field condition; and

   3. where possible, phrase the request in such a way that a specific “yes” or “no” answer will address the issue.

Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are available on the Current Standards Activities page at standardsactivities.csa.ca.

October 2014 © 2014 Canadian Standards Association 8

CSA 3.8:14 Gas-fired equipment for drying farm crops

CSA 3.8:14

Gas-fired equipment for drying farm crops

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:

1. with natural gas; and

2. 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