Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by and is under the jurisdiction of the Ministry of Housing and Urban-Rural Development of the People's Republic of China.
Town liquefied natural gas (LNG) gasification supply installations
1 Scope
This standard specifies the classification, code and model, structure and materials, requirements, test methods, inspection rules, quality certification documents, marking, packaging, transportation and storage of town liquefied natural gas (LNG) gasification supply installations (hereinafter referred to as LNG gasification supply installations).
This standard is applicable to LNG gasification supply installations with the maximum working pressure not greater than 1.6MPa, the total volume of tanks not greater than 20m3, the total volume of gas cylinder sets not greater than 4m3 and the total gas supply not greater than 2,000m3/h, which supply gas to gas users in towns.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 150 (All parts) Pressure vessels
GB/T 151 Heat exchangers
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 713 Steel plates for boilers and pressure vessels
GB/T 1220 Stainless steel bars
GB/T 1527 Drawn tube of copper and copper alloys
GB/T 2518 Continuously hot-dip zinc-coated steel sheet and strip
GB/T 3077 Alloy structure steels
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3098.2 Mechanical properties of fasteners - Nuts
GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs
GB/T 3098.15 Mechanical properties of fasteners - Stainless steel nuts
GB/T 3190 Wrought aluminium and aluminium alloy - Chemical composition
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 3531 Steel plates for low temperature pressure vessels
GB 3836.1 Explosive atmospheres - Part 1: Equipment - General requirements
GB 3836.2 Explosive atmospheres - Part 2: Equipment protection by flameproof enclosures “d”
GB 3836.3 Explosive atmospheres - Part 3: Equipment protection by increased safety "e"
GB 3836.4 Explosive atmospheres - Part 4: Equipment protection by intrinsic safety “i”
GB 3836.5 Explosive atmospheres - Part 5: Equipment protection by pressurized enclosure “p”
GB 3836.9 Explosive atmospheres - Part 9: Equipment protection by type of protection “m”
GB 3836.14 Explosive atmospheres - Part 14: Classification of areas - Explosive gas atmosphere
GB 3836.15 Explosive atmospheres - Part 15: Electrical installations design, selection and erection
GB/T 3880 (All parts) Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering
GB/T 4208 Degrees of protection provided by enclosure (IP code)
GB/T 4237 Hot rolled stainless steel plate, sheet and strip
GB/T 4272 General principles for thermal insulation technique of equipment and pipes
GB/T 4437.1 Aluminium and aluminium alloy extruded tubes - Part 1: Seamless tubes
GB/T 4879 Rustproof Packaging
GB 4943.1-2011 Information technology equipment - Safety - Part 1: General requirements
GB/T 4956 Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method
GB/T 5310 Seamless steel tubes and pipes for high pressure boiler
GB/T 5330.1 Industrial wire screens and woven wire cloth - Guide to the choice of aperture size and wire diameter combinations - Part 1: Generalities
GB/T 6388 Transport package shipping mark
GB/T 6479 Seamless steel tubes for high-pressure for chemical fertilizer equipment
GB/T 6892 Wrought aluminium and aluminium alloys extruded profiles for general engineering
GB/T 6893 Aluminium and aluminium alloys cold drawn (rolled) seamless tubes
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 7999 Optical emission spectrometric analysis method of aluminum and aluminum alloys
GB/T 8163 Seamless steel pipes for liquid service
GB 8624 Classification for burning behavior of building materials and products
GB/T 8890 Seamless copper alloy tube for heat-exchanger
GB/T 8923 (All parts) Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness
GB/T 9124 (All parts) Steel pipe flanges
GB/T 9286 Paints and varnishes - Cross cut test for films
GB/T 9711 Petroleum and natural gas industries - Steel pipe for pipeline transportation systems
GB/T 9948 Seamless steel tubes for petroleum cracking
GB/T 10699 Calcium silicate thermal insulation products
GB/T 11835 Rock wool, slag wool and its products for thermal insulation
GB/T 12221 Metal calves - Face to face, end to end, center to face and center to end dimensions
GB/T 12224 General requirements for industrial steel valves
GB/T 12225 General purpose industrial valves - Specification of copper alloy castings
GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings
GB/T 12229 General purpose industrial valves - Specification of carbon steel castings
GB/T 12230 General purpose industrial valves - Specification of stainless steel castings
GB/T 12235 Steel globe valves and lift check valve for petroleum petrochemical and allied industries
GB/T 12237 Steel ball valves for petroleum petrochemical and allied industries
GB/T 12241 Safety valves - General requirements
GB 12348 Emission standard for industrial enterprises noise at boundary
GB 12358 Gas monitors and alarms for workplace - General technical requirements
GB/T 12459 Steel buttwelding pipe fittings - Types and parameter
GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
GB/T 13296 Seamless stainless steel tubes for boiler and heat exchanger
GB/T 13350 Glass wool and its products for thermal insulation
GB/T 13401 Steel buttwelding pipe fittings - Technical specification
GB/T 13955 Installation and operation of residual current operated protective devices
GB/T 14048.1 Low-voltage switchgear and controlgear - Part 1: General rules
GB/T 14383 Forged fittings socket-welding and threaded
GB/T 14525 General specification for corrugated metal hose assemblies
GB/T 14976 Seamless stainless steel pipes for fluid transport
GB 15322 (All parts) Combustible gas detector
GB/T 15675 Continuously electrolytically zinc/zinc-nickel alloy coated steel sheet and strip
GB 16808 Combustible gas alarm control units
GB/T 16912 Safety technical regulation for oxygen and relative gases produced with cryogenic method
GB/T 17116.1 Pipe supports and hangers - Part1: Technical specification
GB/T 17371 Silicate compound plaster for thermal insulation
GB/T 17393 Specification for thermal insulation for use in contact with austenitic stainless steel
GB/T 17794 Preformed flexible elastomeric cellular thermal insulation
GB/T 18442 (All parts) Static vacuum insulated cryogenic pressure vessels
GB/T 18443 (All parts) Testing method of performance for vacuum Insulation cryogenic equipment
GB/T 19672 Specification of pipeline valves
GB/T 20801 (All parts) Pressure piping code - Industrial piping
GB/T 20801.5-2006 Pressure piping code - Industrial piping - Part 5: Inspection and testing
GB/T 20975 Methods for chemical analysis of aluminium and aluminium alloys
GB/T 24511 Stainless steel and heat resisting steel plate, sheet and strip for pressure equipments
GB/T 24918 Cryogenic emergency shutoff valve
GB/T 24925 Low temperature valve - Technical specifications
GB/T 25997 Polyisocyanurate products for thermal insulation
GB/T 26640 Specification for minimal thickness of the shell of valves
GB 27790 City gas pressure regulators
GB/T 28776 Steel gate, globe and check valve for the petroleum and natural gas industries (for sizes DN100 and smaller)
GB/T 29026 Spring loaded safety valve for cryogenic service
GB/T 34336 Nano-pore aerogel composite thermal insulation products
GB/T 36051 Gas filter
GB 50028 Code for design of city gas engineering
GB 50057 Design code for protection of structures against lightning
GB 50058 Code for design of electrical installations in explosive atmospheres
GB 50093 Code for construction and quality acceptance of automation instrumentation engineering
GB 50126 Code for construction of industrial equipment and pipeline insulation engineering
GB 50160 Fire prevention code of petrochemical enterprise design
GB 50217 Standard for design of cables of electric power engineering
GB 50235 Code for construction of industrial metallic piping engineering
GB 50236 Code for construction of field equipment, industrial pipe welding engineering
GB 50264 Code for design of industrial equipment and pipeline insulation engineering
GB 50316 Design code for industrial metallic piping
GB 50493 Specification for design of combustible gas and toxic gas detection and alarm for petrochemical industry
GB 50650 Design code for lightning protection of petrochemical installations
GB 50683 Code for acceptance of field equipment, industrial pipe welding construction quality
CJ/T 335 Slam-shut valves and relief valves for city gas
CJ/T 448 Odorization unit for city gas
CJ/T 514 Metal valves for gas transmission
HG/T 20222 Technical specification for welding aluminium and aluminium alloys
HG/T 20585 Technical specification for steel low temperature pressure vessels
HG/T 20592 Steel pipe flanges (PN designated)
HG/T 20607 PTFE envelope gaskets for use with steel pipe flanges (PN designated)
HG/T 20609 Metal jacketed gaskets for use with steel pipe flanges (PN designated)
HG/T 20610 Spiral wound gaskets for use with steel pipe flanges (PN designated)
HG/T 20611 Covered serrated metal gaskets for use with steel pipe flanges (PN designated)
HG/T 20612 Metallic ring joint gaskets for use with steel pipe flanges (PN designated)
HG/T 20613 Bolting for use with steel pipe flanges (PN designated)
HG/T 20615 Steel pipe flanges (Class designated)
HG/T 20628 PTFE envelope gaskets for use with steel pipe flanges (Class designated)
HG/T 20630 Metal jacketed gaskets for use with steel pipe flanges (Class designated)
HG/T 20631 Spiral wound gaskets for use with steel pipe flanges (Class designated)
HG/T 20632 Covered serrated metal gaskets for use with steel pipe flanges (Class designated)
HG/T 20633 Metallic ring joint gaskets for use with steel pipe flanges (Class designated)
HG/T 20634 Bolting for use with steel pipe flanges (Class designated)
JB/T 2549 Specifications for manufacturing aluminum air separation plants
JB/T 4711 Coating and packing for pressure vessels transport
JB/T 6896 Surface cleanliness of air separation plants
JB/T 7248 Technical specification for low temperature service steel casting for valves
JB/T 12621 Liquefied natural gas valves - Technical requirements
JB/T 12624 Globe valves and check valves for liquefied natural gas
JB/T 12625 Ball valves for liquefied natural gas
JB/T 12665 Vacuum insulated cryogenic pipe
JC/T 647 Cellular glass product for thermal insulation
NB/T 47003.1 Steel welded atmospheric pressure vessels
NB/T 47008 Carbon and alloy steel forgings for pressure equipment
NB/T 47009 Alloy steel forgings for low temperature pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment
NB/T 47013 (All parts) Nondestructive testing of pressure equipments
NB/T 47014 Welding procedure qualification for pressure equipment
NB/T 47018.6 Technical permission of welding materials for pressure equipment - Section 6: Bare aluminum and aluminum-alloy welding electrodes and rods
NB/T 47020
~NB/T 47023 Type and specification for pressure vessel flanges
SH/T 3010 Design specification for the thermal insulation of equipment and pipe in petrochemical industry
SH/T 3019 Design code for instrument tubing and wiring in petrochemical industry
SH/T 3097-2017 Code for the design of static electricity grounding for petrochemical industry
SY/T 6503 Safety specification of combustible gas detection and alarm system for petroleum and natural gas engineering
SY/T 7036 Specification of external coating for piping and equipments in petroleum and gas stations
TSG 21 Supervision regulation on safety technology for stationary pressure vessel
TSG D0001-2009 Pressure pipe safety technology supervision regulation for industrial pressure pipe
TSG D7002 Pressure piping components type test regulation
TSG R0006 Supervision regulation on safety technology for gas cylinder
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1.1
liquefied natural gas; LNG
colorless fluid in liquid state, which is mainly composed of methane and may contain a small amount of ethane, propane, nitrogen or other components usually found in natural gas
[GB/T 19204-2003, Clause 3]
3.1.2
LNG gasification supply installations
component combination device that assembles all or part of LNG storage equipment, supercharger, vaporizer, quarter final, pressure regulator, measuring equipment, odorization equipment, safety emission device, combustible gas alarm device, monitoring device, etc. on a base for realizing all or part of functions such as LNG storage, gasification, heating, filtration, pressure regulation, measurement and odorization, and integrating auxiliary functions such as automatic control, monitoring and detection
3.1.3
vaporizer
equipment for vaporizing LNG
3.1.4
air vaporizer
equipment that heats LNG with the heat in atmosphere as the heat medium to vaporize the LNG
3.1.5
water vaporizer
equipment that heats LNG with hot water as the heat medium to vaporize the LNG
Note: It includes hot water vaporizer, steam water vaporizer and electrical water vaporizer.
3.1.6
quarter final
equipment that heats the gas at the outlet of air vaporizer to prevent cryogenic gas from damaging the back-end pipeline
3.1.7
normal temperature pipeline
pipeline with a design temperature of not lower than -20℃
3.1.8
cryogenic pipeline
pipeline with a design temperature of lower than -20℃
3.1.9
boiled-off gas; BOG
cryogenic gaseous natural gas converted from a small amount of LNG due to the absorption of leaked heat during LNG storage or transportation
3.1.10
BOG heater
equipment for heating cryogenic natural gas boiled off naturally
3.1.11
emission ambient gas; EAG
natural gas emitted centrally by LNG plants and stations during system over-pressure and overhaul
3.1.12
EAG heater
equipment which is connected with centralized emission pipe and heats the EAG by heat source
3.1.13
emergency cut-off device
device that is able to cut off the LNG flow in LNG gasification supply installations locally or remotely in case of emergency
3.1.14
emergency relief device
device for rapidly discharging natural gas in LNG gasification supply installations to relieve its internal pressure in case of emergency
3.1.15
emergency shutdown device
device that quickly cuts off valves or shuts down equipment in case of emergency
3.1.16
thermal insulation
generic term for heat insulation and cold insulation
3.1.17
heat insulation
coating measure taken on the outer surface of equipment, pipeline and their accessories to reduce heat dissipation to the surrounding environment or temperature drop on surface
3.1.18
cold insulation
coating measure taken on the outer surface of cryogenic equipment and pipeline to reduce heat transfer from the surrounding environment into them and prevent condensation on the outer wall surface of them
3.1.19
thermal insulation construction
structural complex composed of thermal insulation layer, moisture-proof layer, protective layer, etc.
3.1.20
cryogenic nitrogen test
cooling test for inspecting the system performance and applicability before putting the equipment into use, wherein, the LNG pipeline is cooled with cryogenic nitrogen
3.2 Abbreviations
For the purposes of this document, the following abbreviations apply.
BOG: boiled-off gas
EAG: emission ambient gas
ESD: emergency shutdown device
FS: full scale
LEL: lower explosive limit
LNG: liquefied natural gas
4 Classification, codes and models
4.1 Classification
4.1.1 The installations may be classified into single-pipeline and multiple-pipeline types according to the pipeline structure.
4.1.2 The installations may be classified as follows according to the working ambient temperature range:
——Class I, -10~+60℃;
——Class II, -20~+60℃;
——Class III, below -20℃.
4.1.3 The installations may be classified into 0.01MPa, 0.2MPa, 0.4MPa, 0.8MPa, 1.6MPa, etc. according to the outlet working pressure.
4.1.4 The installations may be classified into 100m3/h, 200m3/h, 300m3/h, 500m3/h, 1,000m3/h, 1,500m3/h, 2,000m3/h, etc. according to the gas supply.
4.2 Code
4.2.1 Maximum working pressure (MPa), expressed by its numerical value, such as 0.8, 1.6, etc.
4.2.2 Outlet working pressure (MPa), expressed by its numerical value, such as 0.01, 0.2, 0.4, 0.8, 1.6, etc.
4.2.3 Gas supply value, expressed by the first two digits of the design vaporizing amount expressed in m3/h, with the surplus digit discarded and 0 supplemented in case of one digit only. When multiple outlets are available in the gasification installations, the gas supply is expressed by the vaporizing amount of each outlet connected by "+”.
4.2.4 Heat exchange modes of vaporizer include air type, water type and other types. See Table 1 for the codes of heat exchange modes of vaporizer.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and definitions
3.2 Abbreviations
4 Classification, codes and models
4.1 Classification
4.2 Code
4.3 Model
5 Structure and materials
5.1 General requirements
5.2 Structure
5.3 Welding
5.4 Coating
5.5 Materials
5.6 Electric control
5.7 Emergency shutdown device
5.8 Alarm device for combustible gas leakage
6 Requirements
6.1 Appearance
6.2 Overall dimension
6.3 Non-destructive testing
6.4 Strength
6.5 Airtightness
6.6 Pressure regulating performance
6.7 Performance of cut-off device
6.8 Performance of emission device
6.9 Closing pressure
6.10 Electrical safety performance
6.11 Explosion-proof performance
6.12 Cryogenic nitrogen test
6.13 Vaporizing amount
6.14 Coating
7 Test method
7.1 Test conditions
7.2 Appearance test
7.3 Inspection of overall dimension
7.4 Non-destructive testing
7.5 Pressure test
7.6 Airtightness test
7.7 Pressure regulating performance test
7.8 Test on performance of cut-off device
7.9 Test on performance of emission device
7.10 Closing pressure test
7.11 Electrical safety performance test
7.12 Explosion-proof performance
7.13 Cryogenic nitrogen test
7.14 Vaporizing amount test
7.15 Coating test
7.16 Inspection of materials, parts and components
8 Inspection rules
8.1 Inspection classification
8.2 Inspection items
8.3 End-of-manufacturing inspection
8.4 Type inspection
8.5 Judgment rules
9 Quality certification document, marking, packaging, transportation and storage
9.1 Quality certification document
9.2 Marking
9.3 Packaging and transportation
9.4 Storage
Annex A (Normative) Basic technical requirements of vaporizer
Annex B (Normative) Cryogenic nitrogen test
