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Content
1 General Provisions
2 Terms
3 Gas Consumption and Quality
3.1 Gas Consumption
3.2 Gas Quality
4 Gas Manufacture
4.1 General Requirement 8
4.2 Gas Manufacture by Coal Carbonization 8
4.3 Gas manufacture by coal gasification 13
4.4 Gas Manufacture by Low Pressure Intermittent Cyclic Catalytic Cracking of Heavy Oil 18
4.5 Gas Manufacture by Low Pressure Intermittent Cyclic Catalytic Cracking of Light Oil 20
4.6 Gas Manufacture by Low Pressure Intermittent Cyclic Catalytic Cracking of Liquefied Petroleum Gas 21
4.7 Gas Manufacture by Low Pressure Intermittent Cyclic Catalytic Reforming of Natural Gas 22
4.8 Peak Shaving 23
5 Purification 25
5.1 General requirement 25
5.2 Gas condensation and cooling 25
5.3 Gas discharging and transmitting 26
5.4 Removal of tar fog 27
5.5 Ammonia removal by sulfuric acid absorption method 28
5.6 Ammonia removal by water washing 29
5.7 Final cooling of gas 30
5.8 Absorption of crude benzene 30
5.9 Final removal of naphthalene 31
5.10 Wet desulfurization 31
5.11 Desulfurization by ferric oxide method at atmospheric pressure 32
5.12 Conversion of carbon monoxide 34
5.13 Gas dehydration 35
5.14 Relief gas and liquid seal 35
6 Gas Transmission and Distribution System 36
6.1 General requirement 36
6.2 Design of gas flow and hydraulic calculation of gas pipelines 37
6.3 The outdoor gas pipelines with pressure not higher than 1.6 MPa 39
6.4 The outdoor gas pipelines with pressure higher than 1.6 MPa 44
6.5 City Gate and storage and distribution station 51
6.6 Regulator station and regulators 60
6.7 Corrosion control for steel gas pipelines and storage tanks 67
6.8 Supervisory control and data acquisition (SCADA) 68
7 Supply of Compressed Natural Gas (CNG) 70
7.1 General requirement 70
7.2 CNG fuelling station 70
7.3 CNG stored and distributed station 76
7.4 Station for CNG multiple cylinder installations 77
7.5 Pipes and accessories 78
7.6 Buildings and auxiliary facilities for production 79
8 Supply of Liquefied Petroleum Gas (LPG) 80
8.1 General requirement 80
8.2 LPG transportation 80
8.3 LPG supply base 85
8.4 Vaporizing station and mixing station 93
8.5 Vaporizing station of multiple cylinder installations 100
8.6 Bottled LPG delivered station 101
8.7 Users 103
8.8 Pipes, accessories, storage tanks, vessels and instruments 103
8.9 Fire Prevention, explosion protection and earthquake resistance of buildings or structures 106
8.10 Fire water supply, drainage and fire-fighting equipments 106
8.11 Electricity 108
8.12 Communication and afforesting 109
9 Supply of Liquefied Natural Gas (LNG) 110
9.1 General requirement 110
9.2 LNG vaporizing station 110
9.3 Vaporizing station of LNG multiple cylinder installations 114
9.4 Pipelines & accessories, storage tanks, vessels, vaporizers, gas heaters and checking instruments 115
9.5 Fire water supply, drainage and extinguishing apparatuses 117
9.6 Civil engineering and auxiliary production facilities 118
10 Application of Gas 119
10.1 General requirement 119
10.2 Indoor gas pipelines 119
10.3 Metering of gas 128
10.4 Gas for domestic use 129
10.5 Gas for commercial use 130
10.6 Gas use for industrial enterprises production 132
10.7 Exhaustion of flue gas from burning 134
10.8 Monitoring facilities of fuel gas and lightning and static electricity protection 136
Appendix A Classification of Explosion and Fire Hazard Areas for Main Workplaces in Gas Manufacture Workshops 139
Appendix B Classification of Explosion and Fire Hazard Areas for Main Workplaces in Gas Purification Workshops 142
Appendix C Friction Resistance Calculation of Gas Pipelines 143
Appendix D Classification of Explosion Hazard Areas for Electric Installation Workplaces in Gas Transmission and Distribution System 145
Appendix E Classification for Explosion Hazard Areas for Electric Installation Workplaces in LPG Station 149
Appendix F Residential Gas Appliance Coincidence Factor, K 153
Explanation of Wording in This Code 154
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