1.0.1 This code is formulated with a view to standardizing the construction procedures of natural gas gathering and transmission pipeline in highly sulfur gas field, specifying each construction technical requirement, improving the construction quality of natural gas gathering and transmission pipeline in highly sulfur gas field, ensuring the safety operation of pipeline, and reducing the engineering cost.
1.0.2 This code is applicable to the construction of the constructed, extended and renovated natural gas gathering and transmission pipeline with the volume fraction of H2S in the natural gas greater than or equal to 5%.
1.0.3 Highly sulfur natural gas gathering and transmission pipeline includes the gas sampling pipe line, gas gathering branch line and gas gathering main line from the gas well mouth to the natural gas conditioning plant.
1.0.4 The part the same as the construction technical requirements for the natural gas gathering and transmission pipeline in non-highly sulfur gas field shall be implemented according to the relevant requirements of the current professional standard "Specification for Construction of Oil and Gas Field Gathering and Transmission Pipeline" SY/T 0422.
1.0.5 The construction of gathering and transmission pipeline in highly sulfur gas field shall not only comply with this code but also comply with those in the current relevant ones of the nation.
1 General 1
2 Terms 2
3 Acceptance and Storage of Materials and Pipeline Components 3
3.1 General Rules 3
3.2 Steel Pipes 3
3.3 Hot-bent Pipes 4
3.4 Valves 4
3.5 Insulating Joints 5
3.6 Other Pipeline Components 6
3.7 Welding Materials 7
3.8 Anti-corrosion Heat-insulating Material 7
4 Prefabrication and Installation of Pipeline 9
4.1 Pipeline Processing and Assembly 9
4.2 Pipe Fitting Assembly 12
4.3 Valve Installation 12
4.4 Installation of Supports and Hangers of Pipeline 13
4.5 Prefabrication of Pipeline 13
5 Welding and Thermal Treatment of Pipeline 14
5.1 General Rules 14
5.2 Welding 14
5.3 Pre-heating and Post Welding Heat Treatment 15
5.4 Return for Repair 16
5.5 Marking of Weld Cater 17
6 Quality Inspection of Weld 18
6.1 General Rules 18
6.2 Visual Inspection 18
6.3 Non-destructive Test 19
7 Anticorrosion, Insulation, Joint Coating & Coating Defect Repairing of Pipeline 20
8 Pipeline Pigging and Pressure Testing 21
8.1 General Requirements 21
8.2 Pigging and Diameter Measuring 22
8.3 Test on Strength and Tightness of Pipeline 23
9 Pipeline Drying 26
10 Joints of Pipeline 27
11 Health, Safety and Environment 28
12 Project Delivery and Acceptance 29
Specification of Word Using 31
List of Quoted Standards 32
References 33
