Specification for Design of Steel Structure of Tubular Heater in Petrochemical Industry
1 Scope
This Specification specifies design discipline for steel structure, load and action effect calculation, calculation for member and connection, and requirement for steel structure.
This Specification is applicable to design for steel structure of tubular heater (including cylindrical furnace and box type furnace), chimney, air flue gas ducts system in petrochemical industry (hereinafter referred to as "steel structure"), but not applicable to steel structure requiring fatigue checking.
2 Normative references
The following documents contain provisions which, through reference in this Specification, constitute provisions of this Specification. For dated reference, subsequent amendments to, or revisions of any of these publications do not apply. And codes are subject to revision, and parties to agreements based on this Specification are encouraged to investigate the possibility of applying the most recent editions of the codes indicated below. For undated references, the latest edition of the normative document referred to applies. For undated references, the latest edition of the normative document referred to applies.
GB/T 700 Carbon Structural Steels
GB 985 Basic Forms and Sizes of Welding Joint for Manual Arc Welding
GB 986 Basic Forms and Sizes of Welding Joint for Submerged Arc Welding
GB/T 1228 High Strength Bolts with Large Hexagon Head for Steel Structures
GB/T 1229 High Strength Large Hexagon Nuts for Steel Structures
GB/T 1230 High Strength Plain Washers for Steel Structures
GB/T 1231 Specifications of High Strength Bolts with Large Hexagon Head, Large Hexagon Nuts, Plain Washers for Steel Structures
GB/T 1591 High Strength Low Alloy Structural Steels
GB/T 3632 Type and Dimension for Sets of Torshear Type High Strength bolt Hexagon Nut and Plain Washer for Steel Structures
GB/T 3633 Technical Requirement for Sets of Torshear Type High Strength Bolt Hexagon Nut and Plain Washer for Steel Structures
GB 4053.1 Fixed Steel Vertical Ladders
GB 4053.2 Safety Specification for Fixed Steel Oblique Ladders
GB 4053.3 Safety Requirements for Fixed Industrial Protective Railings
GB 4053.4 Fixed Steel Industrial Platform
GB/T 5117 Carbon Steel Covered Electrodes
GB/T 5118 Low Alloy Steel Covered Electrodes
GB/T 5313 Steel Plate with Through-thickness Characteristics
GB/T 5780 Hexagon Head Bolts-Product Grade C
GB/T 5782 Hexagon Head Bolts
GB/T 8923 Rust Grades and Preparation Grades of Steel Surfaces before Application of Paints and Related Products
GB 50009-2001 Load Code for the Design of Building Structures
GB 50011 Code for Seismic Design of Buildings
GB 50017-2003 Code for Design of Steel Structures
GB 50046 Code for Anticorrosion Design of Industrial Constructions
GB 50051-2002 Code for Design of Chimneys
GB 50205 Code for Acceptance of Construction Quality of Steel Structures
SH 3022 Technical Specification for the Coating Anticorrosion of Equipment and Piping in Petrochemical Industry
SH/T 3036 Fired Heaters for General Refinery Service
3 Design discipline
3.1 This Specification is designed with limit design method based on probability theory, and calculated with the fiduciary level index as the fiduciary level of structural members, and according to the design expressions of representative values like load and material property, structural significance factor, itemized factor and factor of combination value;
3.2 Bearing steel structure shall be designed according to the following limit state of bearing capacity and limit state of regular service;
a) Limit state of bearing capacity includes: strength destruction of member and connection, and inapplicable to keep on bearing because of over distortion, structure and member losing stability and structure transform to automotive system and structure overturn;
b) Limit state of regular service includes: influence regular service or apparent distortion for structure, member and non-structural member, influence vibration for regular service and influence for regular service or local damage for durability.
3.3 Safety grades of steel structure for tubular heater, chimney and air flue gas ducts system in petrochemical industry shall be Grade two.
3.4 When designing steel structure according to limit state of bearing capacity, it shall consider basic combination of load effect. If necessary, it shall also consider incidental combination of load effect.
3.5 When designing steel structure according to limit state of regular service, it shall consider standard combination of load effect.
3.6 When calculating strength and stability for structure bearing dynamic load directly, the design value of dynamic load shall be multiplied by dynamic factor.
3.7 Internal force of steel structure should be elastically analyzed according to structure static method. When checking strength and stability of the member, it shall take no account of sections developing plastic deformation.
Forward IV
1 Scope
2 Normative references
3 Design discipline
4 General requirement for the design
4.1 Material
4.2 Design index
4.3 Specification for deformation of structure or member
4.4 Specification for general design
5 Load and action
5.1 Classification of load and action
5.2 Wind load
5.3 Platform live load
5.4 Snow load
5.5 Equivalent load for blower fan on top of the heater
5.6 Earthquake effect
6 Calculation for load and action effect
6.1 Calculation for load and action effect
6.2 combination calculation for earthquake effect and other load effects
7 Calculation for strength and stability of member
7.1 General requirement
7.2 Bending member
7.3 Load-bearing members in axle center
7.4 Stretch bending member and press bending member
7.5 Thin wall cylinder
7.6 Effective length of members
8 Connection calculation
8.1 General requirements
8.2 Welding connection
8.3 Bolting (such as plain bolt)
8.4 Fixed joint of beam and pillar
8.5 Calculation of plates at connected node
8.6 Anchor (anchor bolt) connection
9 Construction requirements
9.1 Ordinary construction
9.2 Weld connection
9.3 Bolted connection and anchor
9.4 Cylindrical furnace
9.5 Box type furnace
9.6 Chimney and air flue gas ducts
9.7 Truss
9.8 Measures for improving the structure's anti-brittle capacity in cold area
9.9 Manufacture, transportation and installation
9.10 Protection and thermal insulation
Appendix A (Informative) Winter Calculated Temperature in Cold Area
Appendix B (Normative) Wind Load Calculation
Appendix C (Informative) Effective Area of Bolt and Anchor Bolt
Appendix D (Informative) Maximum Displacement during Chimney Syntony
Wording explanations in this Specification
