中华人民共和国住房和城乡建设部公告

Foreword

1　Scope

2　Normative　References

3　Basic　Design　Principles

4　Shape，Size　and　Materials　for　Ducts

5　Layout　of　Ducts

• 5.1　General　Requirements

• 5.2　Flue　Gas　Ducts

• 5.3　Air　Ducts

6　Structure　of　Ducts

• 6.1　General　Requirements

• 6.2　Duct　and　Reinforcement　Ribs

• 6.3　Type　Selection　for　Ducts

• 6.4　Insulation　Construction

7　Components，Parts　and　Drive　Assemblies

8　Supports　and　Hangers

Appendix　A（Informative）　Specification　Selection　for　Reinforcement　Ribs　and　Internal　Supporting　Bracings　of　Rectangular　Duct

Appendix　B（Normative）　Welding　of　Duct　to　Flanges

Appendix　C（Normative）　Welding　of　Reinforcement　Ribs

Appendix　D（Normative）　Typical　Layout　of　Reinforcement　Ribs　and　Node　Types　of　Internal　Supporting　Rods　for　Rectangular　Duct

Appendix　E（Informative）　Type　Selection　for　Transverse　Reinforcement　Ribs　of　Circular　Duct

Explanation　of　Wording　in　This　Specification