Foreword

1　Scope

2　Normative　References

3　Terms　and　Definitions

4　Design　Basis

• 4.1　Design　Pressure

• 4.2　Design　Temperature

• 4.3　Design　Loads

• 4.4　Additions　to　the　Thickness

• 4.5　Minimum　Thickness

• 4.6　Allowable　Stress

5　Materials

• 5.1　General　Principles　for　Material　Selection

• 5.2　Pressure　Part

• 5.3　Non-Pressure　Part

• 5.4　Skirts

• 5.5　Anchor　Bolts

• 5.6　Welding　Materials

6　Design　Calculations

• 6.1　Strength　and　Stability　Calculations　for　Column

• 6.2　Calculations　of　Wind　Load　and　Seismic　Load

• 6.3　Calculations　for　Equivalent　Design　Pressure　of　Girth　Flanges

• 6.4　Strength　Calculations　for　Tray　Floors　and　Support　Beams

• 6.5　Strength　Calculations　for　Packing　Support　Grids　and　Packing　Support　Beams

• 6.6　Local　Stress　in　Column　Shells

7　Structural　Design

• 7.1　Main　Parts　in　Column　and　Their　Descriptions

• 7.2　Column　Shells

• 7.3　Skirts　and　Anchor　Bolt　Chairs

• 7.4　Manholes　and　Handholes

• 7.5　Nozzles

• 7.6　Opening　Reinforcement

• 7.7　Trays

• 7.8　Packing，Packing　Support　and　Stoppers

• 7.9　Column　Bottom　Partitions

• 7.10　Impingement　Baffles

• 7.11　Vortex　Breakers

• 7.12　Gas　Outlet　Baffles　and　Wire　Mesh　Demisters

• 7.13　Internal　Ladders

• 7.14　Hot（Cold）Insulation　Support　Rings

• 7.15　Fireproofing　for　Skirts

• 7.16　Top　Davits

• 7.17　Lifting　Lugs

• 7.18　Earth　Lugs

• 7.19　Platforms　and　Ladders　for　Columns

• 7.20　Nameplates　and　Nameplate　Brackets

8　Fabrication，Inspection　and　Acceptance

• 8.1　General　Requirernents

• 8.2　Dimension　Tolerances

• 8.3　Perpendicularity　Tolerances　of　Column

• 8.4　Positional　and　Dimensional　Deviation　for　Trays

• 8.5　Installation　Flatness　Tolerances　for　Packing　Support　Rings

• 8.6　Non-destructive　Testing

• 8.7　Post　Weld　Heat　Treatment（PWHT）　for　Stress　Relief

• 8.8　Column　Assembled　on-site　with　Sections　and　Segments

Appendix　A（Normative）　Undertolerance　of　Commonly　Used　Steels

Appendix　B（Informative）　Mass　Estimates　for　Platforms，Vertical　Ladders　and　Trays

Appendix　C（Informative）　Bulk　Density　of　Commonly　Used　Packing

Appendix　D（Informative）　Controlled　Values　of　Deflection　at　Top　of　Column

Appendix　E（Informative）　Packing　Support　Rings　and　Support　Clips

Appendix　F（Informative）　Precautions　against　Failure　of　Column　due　to　Across-Wind　Resonance

• F.1　Calculations　of　Resonance　Occurrence　and　Stress　due　to　Across-wind　for　Bare　Columns

• F.2　Requirements　for　Structural　Design，Welding　and　non-Destructive　Testing

• F.3　Types　of　Flow　Spoiler

• F.4　Adjustment　of　Column　Diameter　and　Height-to-diameter　Ratio

• F.5　Arrangement　for　Column　Group

• F.6　Arrangement　for　Platforms　at　the　Upper　Part　of　Columns

• F.7　Erection　for　the　Columns

Explanation　of　Wording　in　This　Code