1.0.1 This code stipulates the welding construction requirements of carbon steel and low alloy steel pipe weld in highly hydrogen sulfide natural gas pipeline transmission system in oil and gas industry.
1.0.2 This code is applicable to the welding construction of the natural gas transmission pipeline in which the volume fraction of the H2S in natural gas is larger than or equal to 5%, this code does not replace other technical standards and specifications which are relevant to natural gas gathering and transmission and process pipeline welding of the purification facility.
1.0.3 Welding of gathering and transmission pipelines for highly hydrogen sulfide gas field shall not only meet those specified in this Code, but also comply with those in the current relevant ones of the nation.
1 General Provisions 1
2 Terms 2
3 The General Rules of Welding 3
3.1 Basic Requirements 3
3.2 Welding Equipment 3
3.3 Materials 3
4 Welding Procedure Qualification 5
4.1 General Requirement 5
4.2 Welding Procedure Specification 5
4.3 Change of Welding Procedure Specification 6
4.4 Testing of Welded Joints-Butt Welds 7
4.5 Welding Procedure Qualification of the Repair Welding 11
5 Welders 13
5.1 Qualification Certification of Welders 13
5.2 Operation Test 13
6 Field Site Welding 15
6.1 General Requirement 15
6.2 Fitting-Up 15
6.3 Grounding 15
6.4 Fitting-Up 15
6.5 Weather Conditions 16
6.6 Clearance 16
6.7 Cleaning Between Beads 16
6.8 Preheating 17
6.9 Temperature Control of Interpass and Ccooling 17
6.10 Identification of Welds 17
7 Inspection of welds 18
7.1 General Requirement 18
7.2 Appearance Inspection 18
7.3 Nondestructive Testing 18
8 Repairing for Poor Welds 19
9 Postheat Treatment 20
9.1 General Requirement 20
9.2 Temperature Controlling Equipment 20
9.3 Insulation 20
9.4 Weld Heat Treatment Quality Inspection 21
Appendix A Sample Table of Welding Procedure Qualification Report 22
Appendix B Sample Table of Welding Procedure Specification 30
Specification of Word Using 33
Normative Standards 34
References 35
