1 Scope
This specification specifies the selection of petrochemical pipe materials, as well as the selection requirements and calculation methods of piping components.
This specification is applicable to the selection of petrochemical unit-used piping components with nominal pressure not greater than PN420 (CL2500) and design temperature not exceeding the allowable service temperature range of the materials. It is inapplicable to nonmetallic pipes.
2 Normative References
The following referenced documents are indispensable for the application of this specification. For dated references, only the dated edition applies. For undated references, the latest edition of the referenced documents (including any amendments) applies.
GB 150 Steel Pressure Vessels
GB/T 699 Quality Carbon Structural Steels
GB/T 710 Hot-rolled Quality Carbon Structural Steel Sheets and Strips
GB/T 1220 Stainless Steel Bars
GB/T 2040 Sheet of Copper and Copper Alloy
GB/T 2518 Continuous Hot-dip Zinc-coated Steel Sheets and Strips
GB/T 3280 Cold Rolled Stainless Steel Plate Sheet and Strip
GB/T 3880 Wrought Aluminium and Aluminium Alloy Plates, Sheets and Strips for General Engineering
GB/T 4334 Corrosion of Metals and Alloys - Test Methods for Intergranular Corrosion of Stainless Steels
GB 5310 Seamless Steel Tubes and Pipes for High Pressure Boiler
GB 6479 Seamless Steel Tubes for High-Pressure for Chemical Fertilizer Equipment
GB/T 7306.1 Pipe Threads with 55 Degree Thread Angle Where Pressure-tight Joints Are Made on the Threads - Part 1: Parallel Internal and Taper External Threads
GB/T 7306.2 Pipe Threads with 55 Degree Thread Angle Where Pressure-tight Joints Are Made on the Threads - Part 2: Taper Internal and External Threads
GB/T 9711 Petroleum and Natural Gas Industries - Steel Pipe for Pipeline Transportation Systems
GB 9948 Seamless Steel Tubes for Petroleum Cracking
GB/T 9971 Pure Iron for Raw Material
GB/T 12232 General Purpose Industrial Valve - Flanged Iron Gate Valves
GB/T 12233 General Purpose Industrial Valves - Casting Iron Globe Valves and Lift Check Valves
GB/T 12234 Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries
Foreword i
1 Scope
2 Normative References
3 Piping Classification
4 Piping Design Conditions
4.1 Design Pressure
4.2 Design Temperature
4.3 Ambient Effects
4.4 Dynamic Effects
4.5 Weight Effects
4.6 Thermal Expansion and Contraction Effects
4.7 Displacement of Pipe Support and Orifice
4.8 Reduced Ductility Effects
4.9 Cyclic Effects
5 Piping Design Criteria
5.1 Pressure-Temperature Design Criteria for Piping Components
5.2 Allowable Stress
5.3 Piping Design Life-span
6 Piping Materials
6.1 General Requirements
6.2 Selection of Materials
6.3 Selection of Materials under Corrosion Conditions
7 Piping Components
7.1 Pipe
7.2 Fittings
7.3 Flanges
7.4 Gaskets
7.5 Fasteners
7.6 Selection of Flanges, Gaskets and Fasteners
7.7 Valves
7.8 Piping Connection
7.9 Piping Branch
8 Strength Design of Piping Pressure Components
8.1 General Requirements
8.2 Metal Straight Pipe
8.3 Pipe Bends and Miter Elbows
8.4 Tees
8.5 Blind Plates and Flat Covers
8.6 Nonstandard Reducers
8.7 Branch Connections
Annex A (Informative) Common Toxic Media, Flammable Media
A.1 Danger Grade Classification of Common Toxic Media
A.2 Criticality Classification of Common Flammable Gas Fire
A.3 Criticality Classification of Common Liquefied Hydrocarbon and Flammable Liquid Fire
Appendix B (Informative) Annual Corrosion Rate of Metal Material by High Temperature Oxidation
Appendix C (Informative) Corrosion Curve Figures
C.1 Corrosion Curves of Steels in High Temperature Sulfur
C.2 Operating Limits for Steels in Hydrogen Service to Avoid Decarburization and Fissuring
C.3 Corrosion Curves of Steels in High Temperature Hydrogen and Sulfureted Hydrogen Concomitance Crude Oil
Appendix D (Informative) Service Temperature and Concentration Limit of Carbon Steel and Low Alloy Steel in Alkali Liquor
Appendix E (Informative) Environment Combination of Common Metal Materials Susceptible to Stress Corrosion Crack
Explanation of Wording in This Specification
