1 Scope
This specification specifies the material selection and design for steel column (hereinafter referred to as "column") in the petrochemical engineering as well as the design requirements for manufacture, inspection and acceptance.
This specification is applicable to the design for the skirt-supported column, whose design pressure is not greater than 35MPa, height is higher than 10m and height-diameter ratio is greater than 5.
Note: The column diameter refers to the nominal diameter of the column; as for the unequal-diameter column, its diameter shall be the weighted mean value, see Formula (1).
(1)
Where,
D——the diameter of column body;
H——the height of column;
D1, D2…Di——the nominal diameter of each section in the column body;
h1, h2…hi——the height of each section in the column body.
This specification is not applicable to the design for the following columns:
a) Column with drafting device;
b) Nonmetallic lined column;
c) Row column and column group integrated by operation platform;
d) Column with jacket.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this specification. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this specification are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this specification.
GB 150 "Stationary Pressure Vessels"
GB 713-2008 "Steel Plates for Boiler and Pressure Vessels"
GB 3531-2008 "Low Alloy Steel Plates for Low Temperature Pressure Vessels"
GB 24511-2009 "Stainless Steel Plate, Sheet and Strip for Pressure Equipments"
GB 6479-2000 "Seamless Steel Tubes for High-pressure for Chemical Fertilizer Equipments"
GB/T 8163-2008 "Seamless Steel Tubes for Liquid Service"
GB/T 8165-2008 "Stainless Steel Clad Plates Sheets and Strips"
GB 9948-2006 "Seamless Steel Tubes for Petroleum Cracking"
GB/T 14976-2002 "Stainless Steel Seamless Tubes for Fluid Transport"
GB 50009 "Load Code for the Design of Building Structures"
GB 50011 "Code for Seismic Design of Buildings"
GB 50017 "Code for Design of Steel Structures"
GB 50160-2008 "Fire Prevention Code of Petrochemical Enterprise Design"
HG/T 21512-1995 "Beam Type Gas Injection Packing Support Plate"
HG/T 21574 "Chemical Equipment Lifting Lugs and Engineering Technical Specification"
HG/T 21618-1998 "Wire Mesh Demister"
HG/T 21639 "Top Davit for Towers"
JB/T 4710 "Steel Vertical Vessels Supported by Skirt"
JB 4732 "Steel Pressure Vessels-Design by Analysis"
NB/T 47015-2011 "Welding Specification for Pressure Vessels"
NB/T 47018-2011 "Technical Permission of Welding Materials for Pressure Equipment"
NB/T 47002.1-2009 "Explosion Welded Clad Plate for Pressure Vessels-Part 1"
SH/T 3074 "Steel Pressure Vessels of Petrochemical"
SH/T 3075 "Specification of Material Selections for Steel Pressure Vessels in Petrochemical Industry"
SH/T 3088 "Specification for Design of Tray for Petrochemical Industry"
SH/T 3096 "Material Selection Guideline for Design of Major Equipment in Key Units Processing Sour Crude Oil"
SH/T 3515 "Construction Standard for Large-size Equipment Hoisting Engineering"
SH/T 3524 "Technical Code of Site Assembling and Welding for Petrochemical Static Equipment"
SH/T 3525 "Welding Specification of Low Temperature Steel for Pertrochemical Engineering"
SH/T 3526 "Welding Specification of Different Steels for Pertrochemical Engineering"
SH/T 3527 "Specification for Welding of Stainless Clad Steel in Petrochemical Industry"
TSG R0004 "Supervision Regulation on Safety Technology for Stationary Pressure Vessel"
3 Terms and Definitions
For the purposes of this specification, the terms and definitions specified in GB 150 and JB/T 4710 apply.
4 Design Base
4.1 Design Pressure
4.1.1 Where the design pressure of the column is specially specified in the process system profession or engineering design documents, it shall be determined according to the requirements but shall not be less than those specified in Article 4.1.2 and Article 4.1.3.
4.1.2 The determination principle of the design pressure shall be in accordance with those specified in Table 1.
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Design Base
4.1 Design Pressure
4.2 Design Temperature
4.3 Design Load
4.4 Additional Thickness
4.5 Minimum Thickness
4.6 Allowable Stress
5 Materials
5.1 General Principles of Material Selection
5.2 Pressure Parts
5.3 Non-pressure Parts
5.4 Skirt
5.5 Foundation Bolt
5.6 Welding Materials
6 Design Calculation
6.1 Strength and Stability Calculation of Column
6.2 Wind Load and Earthquake Load Calculation of Column
6.3 Calculation of Flange Equivalent Design Pressure of Column
6.4 Strength Calculation of Tray Plate and Support Beam
6.5 Strength Calculation of Packing Grid Plate and Support Beam
6.6 Local Stress of Column Shell
7 Structural Design
7.1 Main Parts of Column and their Name
7.2 Column Body
7.3 Skirt and Foundation Bolt Base
7.4 Manhole and Handhole
7.5 Connecting Pipe
7.6 Opening Reinforcement Structure
7.7 Tray
7.8 Packing, Supporting Member for Packing and Limiting Stopper
7.9 Column Kettle Partition Plate
7.10 Cushioning Baffle
7.11 Anti-vortex Baffle
7.12 Gas Outlet Baffle and Wire Mesh Demister
7.13 Internal Ladder
7.14 Heat Preservation (Cold Preservation) Support Ring
7.15 Fire Protection Layer of Skirt
7.16 Top Davit for Column
7.17 Lifting Lug
7.18 Electrostatic Earthing Plate
7.19 Platform and Ladder of Column
7.20 Nameplate and Nameplate Base
8 Manufacture, Inspection and Acceptance
8.1 General Requirements
8.2 Physical Dimension Deviation
8.3 Verticality of Column Body Installation
8.4 Position and Dimension Deviation of Tray
8.5 Planeness of Packing Support Ring Installation
8.6 Non-destructive Testing
8.7 Post-weld Stress Relief Heat Treatment
8.8 Column Assembled and Welded on Site by Sections and Pieces
Appendix A (Normative) Thickness Tolerance of Commonly Used Steel Plates
Appendix B (Informative) Mass Estimation of Platform, Ladder and Tray
Appendix C (Informative) Bulk Density of Commonly Used Packing
Appendix D (Informative) Control Value of Column Top Deflection
Appendix E (Informative) Support Ring and Support Block of Packing
Appendix F (Informative) Precautions for Column due to Across-wind Sympathetic Vibration Failure
Explanation of Wording in this Specification
