Article 1.0.1 The rule is applicable to design of vent stack and steel flare stack tower pylons of 150m or below high in petrochemical enterprises.
Article 1.0.2 The codes is compiled in line with the principle of “United Standard fro Design of Building Structure”, GBJ 68-1984.
Article 1.0.3 At the same time to execute the codes, requirements in relevant current national standards still should be followed.
Chapter 2 Design Principle
Section 2.1 General provisions
Article 2.1.1 For the main body structure of a tower pylon, its security grade shall be designed as requirements for grade I, and aseismatic grade shall conform to requirements for Category B.
Article 2.1.2 The elevations of both a vent stack or a flare tip should be determined according to factors in production, safety and other aspects. The height of a tower pylon may be 10m or so lower than a steel vent stack or flare tip.
Article 2.1.3 It is unsuitable that the minimum thickness of a member and its connecting pieces are less than 5mm for a flare stack tower pylon, or 6mm for a vent stack tower pylon. In the case to adopt a steel pipe structure, the wall thickness may be allowed to reduce 1mm, respectively; if a small sectional combined member is adopted, a sufficient corrosion allowance should be reserved for the thickness of member, generally, not less than 0.5mm for a flare tower pylon, or 1,0mm for a vent stack tower pylon.
Article 2.1.4 The dimension of the platform at the top of a flare tower pylon should meet requirements for maintenance of the flare tip. It is unsuitable that the side length is less than 4m for a square platform, or 7m for a triangular one. The height of no handrail is allowed to be less than 1.2m.
Chapter 1 General Principles Chapter 2 Design Principle Section 2.1 General provisions Section 2.2 Selection of tower pylon type Section 2.3 Material Section 2.4 Hoisting job Chapter 3 Load Section 3.1 Category of loads and combination of different loads Section 3.2 Wind load Section 3.3 Seismic action and aseismic check Section 3.4 Out-covering ice load Chapter 4 Calculation of a Tower Pylon Chapter 5 Calculation Of Joint Section 5.1 Gusset plate joint Section 5.2 Spherical node joint Section 5.3 Direct welded steel pipe joint Section 5.4 Flange joint Section 5.5 Hinged bearing base Chapter 6 Construction Section 6.1 General provisions Section 6.2 Construction of a gusset plate joint Section 6.3 Construction of a hollow ball joint Section 6.4 Construction of a direct weld joint of steel pipes Section 6.5 Construction of a flange joint Chapter 7 Construction Requirements Chapter 8 Anticorrosion Design Chapter 9 Groundwork and Foundation Annex 1 Primary Data Annex 2 Design Value of Strength of Weld and Bolting Connection Annex 3 Technical Requirement for Anticorrosive Painting Dressing Construction Annex 4 A reference Use Level for Unit Area of Steel Structure Annex 5 Explanation for Terms Applied in This Code
Chapter 1 General Principles
Article 1.0.1 The rule is applicable to design of vent stack and steel flare stack tower pylons of 150m or below high in petrochemical enterprises.
Article 1.0.2 The codes is compiled in line with the principle of “United Standard fro Design of Building Structure”, GBJ 68-1984.
Article 1.0.3 At the same time to execute the codes, requirements in relevant current national standards still should be followed.
Chapter 2 Design Principle
Section 2.1 General provisions
Article 2.1.1 For the main body structure of a tower pylon, its security grade shall be designed as requirements for grade I, and aseismatic grade shall conform to requirements for Category B.
Article 2.1.2 The elevations of both a vent stack or a flare tip should be determined according to factors in production, safety and other aspects. The height of a tower pylon may be 10m or so lower than a steel vent stack or flare tip.
Article 2.1.3 It is unsuitable that the minimum thickness of a member and its connecting pieces are less than 5mm for a flare stack tower pylon, or 6mm for a vent stack tower pylon. In the case to adopt a steel pipe structure, the wall thickness may be allowed to reduce 1mm, respectively; if a small sectional combined member is adopted, a sufficient corrosion allowance should be reserved for the thickness of member, generally, not less than 0.5mm for a flare tower pylon, or 1,0mm for a vent stack tower pylon.
Article 2.1.4 The dimension of the platform at the top of a flare tower pylon should meet requirements for maintenance of the flare tip. It is unsuitable that the side length is less than 4m for a square platform, or 7m for a triangular one. The height of no handrail is allowed to be less than 1.2m.
Contents of SHJ 29-1991
Chapter 1 General Principles
Chapter 2 Design Principle
Section 2.1 General provisions
Section 2.2 Selection of tower pylon type
Section 2.3 Material
Section 2.4 Hoisting job
Chapter 3 Load
Section 3.1 Category of loads and combination of different loads
Section 3.2 Wind load
Section 3.3 Seismic action and aseismic check
Section 3.4 Out-covering ice load
Chapter 4 Calculation of a Tower Pylon
Chapter 5 Calculation Of Joint
Section 5.1 Gusset plate joint
Section 5.2 Spherical node joint
Section 5.3 Direct welded steel pipe joint
Section 5.4 Flange joint
Section 5.5 Hinged bearing base
Chapter 6 Construction
Section 6.1 General provisions
Section 6.2 Construction of a gusset plate joint
Section 6.3 Construction of a hollow ball joint
Section 6.4 Construction of a direct weld joint of steel pipes
Section 6.5 Construction of a flange joint
Chapter 7 Construction Requirements
Chapter 8 Anticorrosion Design
Chapter 9 Groundwork and Foundation
Annex 1 Primary Data
Annex 2 Design Value of Strength of Weld and Bolting Connection
Annex 3 Technical Requirement for Anticorrosive Painting Dressing Construction
Annex 4 A reference Use Level for Unit Area of Steel Structure
Annex 5 Explanation for Terms Applied in This Code
