SY/T 0071-1993 Selection standard for oil and gas gathering and transportation pipes and pipeline accessories
Some standard content:
Standard for Seletion of Pipe and Acessory in Oil-Gas Gathering and Transparfation Engineering of the People's Republic of China
Selection Standard
Standard for Selection of Pipe and Acessory in Oil-Gas Gathering and Transparfation Engineering SY/T 007193
Main unit: Petroleum Tianneng Gas Corporation, Design Institute of Petroleum Corporation, Sichuan Petroleum Pipe Design Institute, Approval department, Ministry of Energy of the People's Republic of China, Implementation date: August 1, 1893
Petroleum Industry Press
1993·Beijing
Standard for Selection of Pipe and Aecessory in Oil-gas Gatheriag and Transpattation Engineering SY/T 0071-93
Wen Shuoyu
Petroleum Industry Press
1993·Beijing
Ministry of Energy Document
Energy Technology [1993] No. 277
Notice on the Approval of the Release of Sixty Petroleum and Natural Gas Industry Standards including the "Oil and Gas Field Engineering Survey Specification" To all relevant units
The "Oil and Gas Field Engineering Survey Specification" and other sixty standards have been reviewed and approved and are now approved as petroleum and natural gas industry standards and are hereby released. The terminal numbers and names of various standards are as follows:
No. Standard No. Standard Name
1SY 0054-93 Oil and Gas Field Engineering Survey Specification (Replaces SYI0054-83)
2SY 0070-93 Oil Field Water Injection and Distribution Design Specification 3SY/T 0071-93 Selection Standard for Oil and Gas Gathering and Transportation Pipes and Pipeline Accessories 4SY0075-93 Firewall Design Specification for Oil Tank Area 5SY/T0519-93 U-tube Method for Determining Crude Oil Viscosity 6 SY/T0520-93 Rotational Viscometer Method for Determining Crude Oil Viscosity 7SY/T0521-93 Microscopic Observation Method for Determining Crude Oil Wax Point 8SY/T0522-93 Rotational Viscometer Method for Determining Crude Oil Wax Point 9SY 4008-93 Specification for installation and acceptance of pumping units (replacing SYI4008-86)
Specification for installation and acceptance of water injection polyurethane
10SY4011-93
(replacing SYI4011-86)
Specification for anti-deer coating of polyethylene adhesive tape for ground steel pipelines 11SY4014-93
and acceptance specifications
(replacing SYI4014-87)
12 SY/T405-93 Technical requirements for full exposure of spherical storage tanks 13 SY4056-93 Radiography and quality classification of butt welds of petroleum and natural gas steel pipelines
14 SY/T4057-93 Technical conditions for steel pipes with epoxy coatings and internal anti-skin coatings 15 SY4058-93 Construction and acceptance specification for on-site patching and repairing of the outer anti-corrosion layer and insulation layer of buried steel pipelines
16 SY/T4059-93 Construction and acceptance specification for fan-proof and insulation engineering of gas-purifying containers
17SY4060-93
Construction and acceptance specification for equipment and pipeline installation engineering of Tianzhi gas purification device
18SY4061-93
Construction and acceptance specification for heavy oil thermal recovery pipeline
19 SY/T4062--93 Flow operation construction process for long-distance pipeline laying20 SY4063-93 Technical requirements for seismic identification of electrical facilities Technical requirements for seismic identification of atmospheric pressure Wen-type storage tanks21 SY 4064-93
225Y 5030-93 190 series diesel engine for oil drilling machine (replacement #SY5030-83)
23 SY/T 5102-93 Basic environmental test method for oil exploration and development instrument Test K, high temperature and high pressure test
(replacement SY510285)
24 SY/T 5134-93 Basic environmental test method for oil exploration and development receiver Test G: moving (sine test replaces SY513486)
Drill stem conversion joint (replacement SY5200-87)25SY5200-93
26 Y/T5563-93 DS21 ground health data amplification station27SY/T 5564-93
28SY/T 5565-93
29SY/T5566-93
30SY/T5567-93
Controllable source code scanning generator
Water-mixed electronic water meter
Low energy crude oil water content analyzer
Maintenance specification for small diameter flow water content tester31 SY/T 5568-93
32SY/T5569-93
335Y/T557093
34 SY5571-93
35 SY/T 557293
36SY/T5573-93
37 SY/T 5574-93
38 SY5575-93
39SY5576-93
4O SY 5577-93Www.bzxZ.net
41 SY/T 5578-93
42SY/T5579-93
43SY/T5580-93
44 SY/T 5581-93
45SV/T5582-93
46SY/T5583--93
47 SY/T5584-93
4BSY/T 5585.1-
49-SY/T5586-93
Controllable energy electronic control box
Geodetic health instrument station
YKZ480 service measuring CNC geodesy position
Cementing water mixing head
Classification and general technical conditions of drilling and lifting tools used in stations Specifications for measuring instruments for petroleum geophysical prospecting enterprises Specifications for measuring instruments for petroleum and natural gas geological logging enterprises
Processing methods for drill pipe test data
Drilling team camping
Technical requirements for casing loading, unloading, transportation and storage
Oil field surface construction Specifications for the equipment of measuring instruments for engineering construction enterprises
Description methods of special rock reservoirs
Technical management regulations for crude oil emulsions and sewage treatment agents for drop fields
TA1031 Crude oil emulsions
Basic environmental acid test methods for oil exploration and development instruments Acid test N, broadband random alarm
Standard abbreviations for petroleum instruments and meters Basic environmental test methods for oil exploration and development instruments Test J: seeding and sealing test
Electrical parameter test methods for ground-to-ground digital transmission cables Characteristic impedance and transmission time test
Specifications for the contract for the introduction of complete sets of equipment in the petroleum industry 50 SY/T 587.4-93 Conventional well operation of oil and water wells Leakage detection operation procedures for vertical pipe traps in oil layers
51 5Y/T5587.11-93 Conventional well repair operations for oil and water wells Milling process of drillable packers
52 SY/T 558T.12-93 Conventional well repair work for oil and water wells Pumping and steaming 53 SY 5589-93
54 SY/T5590-93
55 SY/T5591-93
56 SY 5592-93
67 5Y 5593-93
58 SY/T5594-93
59 5Y 5490-93
60 SY4065-93
Operation method
Tubular acid preventer
Performance evaluation method of gel profile control agent
Standard for material storage management work grade of petroleum enterprisesPolymer gel type PIA-605 profile control agent
Evaluation and coring quality indicators
Preparation method of water-driven sandstone field development planSodium lubricant for drilling and loading test
Ultrasonic flaw detection and quality grading of butt welds of petroleum and natural gas pipelines
The above standards shall be effective from September 1, 1993. Ministry of Energy of the People's Republic of China
March 27, 1993
1 General
2 Terminology
3 General provisions
Application
5 Selection of valves
6 Selection of flanges, gaskets and fasteners
Application of pipe fittings
Appendix A Data on flange connections
B Pipe fitting materials
Appendix C Explanation of terms
Additional instructions
(6)
(17)
(22)
(24)
(25)
1 General
1.0.1 This standard is formulated to unify the selection of pipes and pipeline accessories in oil and gas gathering and transportation projects in gas fields.
1.0.2 This standard applies to the oil and gas gathering and extraction process pipeline system from the production valve of the oil (gas) tree in the oil and gas field to the first station of the oil and gas pipeline, including the pipeline system of crude oil, natural gas and its products and intermediate products processed in the mine, the pipeline system of chemicals, heat carriers and carriers used in the oil and gas gathering and transportation process, and the pipeline system for drainage, pressure relief, purging and replacement of the pipeline and its connected equipment. 1.0.3 When the oil and gas gathering and transportation process pipeline is connected to the pipeline of related public works or to the equipment (including pumps), the pipes and pipeline fittings at the joints should be properly handled during professional coordination and preparation and ordering, and should be consistent with this standard. 1.0.4 In the design of oil and gas gathering and transportation projects, in addition to complying with this standard, it should also comply with the provisions of the relevant national standards (specifications) currently in force. 1.0.5 Reference standards
2. GB 1048
6. GB 2270
9. GB 9711
10. GB 437
11,GB6893
Nominal diameter of pipes and pipeline accessories
Nominal pressure of pipeline components
Grading of degree of hazard of occupational exposure to substances
Steel pressure vessels
Seamless steel pipes for conveying fluids
Stainless steel seamless pipes
Galvanized welded steel pipes for low-pressure fluid delivery
Welded steel pipes for auxiliary low-pressure fluid delivery
Spiral seam
Spiral welded steel pipes for oil and gas delivery pipelines
Aluminum and aluminum alloy hot extruded pipes
Industrial aluminum and aluminum alloy rolled (rolled) pipes12,GB1530
13.GB1529
14,CB 1187
15.GE1186
16.GB7548
17.GB10540
18.GB10546
19.GB9570
20,GH12232|| tt||21GB1233
22,GB12234
23,GB12235
24,GB12236
25,GB12237
26.GB12238
27 GB12239
28 GB12241~12243
29, GB1224412246
30. GB1224712251
3L.GB9115.69115.16
Extruded yellow steel pipe
Yellow steel pipe
Water hose
Air hose
Gas hose
Rubber hose for oil transportation in oil refinery
Submersible petroleum gas rubber tube
Rubber hose for oil transportation in Haibi
General valve flange connection iron gate
General valve Quick-acting check valve and lifting check valve, universal valve flange and butt welding connection steel, gate valve, universal valve flange connection steel molded check valve and lifting check valve, universal valve steel swing check valve, universal valve flange and butt welding connection brush, ball flange, universal valve flange and wafer connection chain wax, universal foot gate membrane cabinet, safety valve
Wu pressure valve
Yan steam trap
convex face welding steel pipe flange
32,GB9115.179115.23 concave and convex face welding pin pipe flange33,GB9115.24-9115.30 pressure increase face welding solution pipe flange34GB9115.31~9115.36 ring connection face welding steel pipe method35,GB9119.5~9119.10 convex plate type flat rolling steel pipe flange3 6.GB912379123.16 Raised face steel pipe flange cover 37GB9123.17~9123.23 Japanese raised face steel pipe flange 38.GB9123.249123.30 Drop-off steel pipe flange 39.GB9123.319123.36 Ring chain steel flange cover 40.GB9126.2
41.GB9126.3
42.GB9126.4
43 GB4622.1~4622.3
44,GB9128.2
45GB5782
46.GB 901
47,GB6170
48.GB5783
49.GB12459
50GB/T13401
51,JB 81
52,JB82
53,JB86
54.ZBJ16005
55,SYI4039
56,SYI12
57.SY5297
58.SY5036
Asbestos rubber for ancient steel pipe flanges
Asbestos rubber for four-convex pin pipe flanges
Rubber whole sheet
Asbestos rubber for grooved steel pipe flanges
Rubber whole sheet
Steel pipe flange with spiral-wound gasket
Nan-shaped metal for steel pipe flange connection
Hexagonal head studs—A and B grades
Equal length studs—A and B grades||tt| |【Hexagon nuts—A and B grades
Full thread hexagonal bolts—A and B grades
Steel butt-welded seamless pipe fittings
Steel plate butt-welded pipe fittings
Flat steel flanges
Butt-welded steel flanges
Pipeline accessories flange covers
Acid steel valves
Basic terms for petroleum engineering construction
Resistant to chemical cracking of natural gas surface facilities
Straight seam electric welding for oil and gas pipelines
Resistant welding brazed pipes
Pressure fluid transportation spiral seam buried coal weak
59.SY/T5384
60,5Y7510
61.HGr-406
62, HGJ 75
63, JC203400
Ordinary fluid auxiliary pipeline straight seam electric limit
Explosion steel pipe
Steel t-tube fittings
Wire braided expansion tube
Purple fasteners for steel pipe flanges
Asbestos oil-resistant rubber sheet
2 Terminology
2.0.1 Pipeline system, also known as pipeline (or pipeline) system, refers to a system composed of pipes, pipeline accessories and other pipeline components, suitable for certain design conditions. 2.0.2 Pipe is a circular tube with a length much larger than the diameter, used to transport fluids or transmit body pressure. This standard includes steel pipes, alloy pipes, non-ferrous metal pipes and cavity pipes. 2.0.3 Pipeline accessories are parts that are assembled with pipes. This standard includes wide valves, pipe fittings, pipe flanges, gaskets and tight rings. 2.0.4 Temporary parts are parts used for direct connection, sleeves, branches, reducers and expansion parts in pipeline systems. This standard includes odd-ends, reducers, tees, crosses and pipe caps (also known as pipe caps).
2.0.5 Hazardous media in this standard refers to the four types of toxic substances in accordance with the current (occupational toxic hazard classification). 2.0.6 Liquids with a flash point greater than 45°C. 2.0.7 Flammable liquids with a flash point less than or equal to 45°C. Such as crude oil, light hydrocarbons, gasoline, etc.
2.0.8 Combustible gases mixed with air can ignite and burn when exposed to fire or high temperature within the explosion limit.
2.0.9 Gases that are easily mixed with air and have an explosion limit less than 10% or a difference between the upper and lower explosion limits greater than 20%. Such as methane, ethane, propane, butane, ethylene, ethylene, etc.
3 General provisions
3.0.1 The nominal diameter of the flange, valve, flange (and gasket) shall comply with the current "Nominal diameter of pipes and pipeline accessories" 3.0.2 The nominal pressure of pipe fittings, valves, flanges (and heat sinks) shall comply with the current (nominal pressure of pipe inlet components).
3.0.3 The design pressure and design temperature of the pipeline system shall be determined based on the most unfavorable rotational end when the working conditions fluctuate (excluding the load state) and the most serious condition of the five forces and temperature rods that may occur during the operation of the pipe system, in addition to the normal operating conditions. The design value shall comply with the following provisions. 3.0.3.1 The design pressure of the pipeline system subjected to internal pressure shall always be higher than or equal to the maximum working pressure that the pipeline system can reach at the corresponding design temperature. When the actual working pressure may exceed the process requirements, the design pressure shall comply with the following provisions (1) The design pressure of the pipeline system connected to the machine system or the complete vehicle equipment containing the machine system for safety frost prevention shall be greater than or equal to the safety The opening pressure of the widest opening. (2) The design pressure of the high-pressure outlet pipeline system shall be the higher of the following two items:
is the normal suction pressure plus 1.2 times the head.
is the maximum suction pressure plus the head. (3) The design pressure of the natural gas condensate pipeline system shall be greater than or equal to the saturated steam pressure at the highest temperature that the condensate may reach after the device is shut down. (4) If the pressure of the pipeline purge medium is higher than the maximum working pressure of normal operation, the design pressure shall be the pressure of the purge medium. 3.0.3.2 The design pressure of the "vacuum replacement" system shall be equal to 0.1MPa and shall be calculated according to the external medicine.
3.0.3.3 The value of the design temperature of the insulation (net) pipeline shall comply with the following provisions: (1) Under the condition of collection, take the highest or lowest temperature of the conveying medium according to the process flow: 8
When the medium temperature is higher than 0℃ The highest operating temperature of the medium should be taken. Otherwise, the lowest negative temperature should be taken. When the medium temperature changes above and below OC, it should be calculated according to the highest and lowest changes at the corresponding design pressure. Select according to the harsh conditions. (2) If the temperature of the purging medium is higher than the temperature of the conveying medium, the temperature of the purging medium should be taken. If steam is used for purging, the gun and hot steam temperature should be taken. Point 3.0.3.4 The value of the design temperature of the non-insulated (cold) pipeline is completely consistent with the insulated pipeline when the medium temperature is lower than 38°C. When the medium temperature is higher than 8°C, 95% of the medium temperature should be taken.
3.0.4 When the pipeline design temperature is equal to or lower than -20°C, except for the pipeline system using austenitic alloy steel, the steel of the pipe and pipeline accessories should be subjected to Charpy low temperature impact test according to the requirements of "Steel Pressure Vessels". 3.0.5 According to the type and nature of the transported medium, the design pressure and design temperature of the pipeline system, the oil and gas gathering and transportation process pipelines are divided into three categories according to the following conditions. 3.0.5.1 The pipelines that meet all of the following conditions are Class C pipelines (1) Transporting unavoidable media; (2) The selected media are not harmful to the human body (i.e., not within the range defined in the "Classification of Hazards of Occupational Exposure to Toxic Substances"); (3) The design pressure is equal to or lower than 1.0 MPa (4) The design temperature is between 0℃ and 188℃. 3.0.5.2 The pipelines that meet one of the following conditions are Class B pipelines (1) Transporting flammable media (flammable gases and flammable liquids); (2) Transporting media that are slightly harmful to the human body, i.e., the second-level media classified according to the "Classification of Hazards of Occupational Exposure to Toxic Substances", such as liquids, gases and oxygen. (3) The design pressure is higher than 1.0 MPa (4) The design temperature is lower than 0℃ or higher than 186℃ 5.0.5.# Class A pipelines meet the following conditions: they transport media that are highly or moderately harmful to the human body, that is, Class 1, 2, and 3 media classified according to the Occupational Hazard Classification, and the amount of discharge during production may cause the concentration of toxic substances in the air to reach or exceed the requirements of this standard. 3.0.6 The material, specification, and type of pipes and pipeline accessories should first be based on the type of pipeline and the corrosion resistance of the medium, the design pressure and design temperature of the pipeline, and secondly, the range of changes in the operating humidity of the pipeline, the importance of the pipeline in production, whether it is affected by mechanical movement and other environmental conditions, and the adaptation period of the project to which it belongs should be considered comprehensively to achieve the unity of safety, applicability, and economy. 3.0.7 The nominal pressure of pipeline components shall be equal to or higher than the design pressure of the pipeline system. The minimum nominal pressure of pipe accessories for Class B and Class A pipelines shall also meet the following requirements.
5.0.7.1 The minimum nominal pressure of pipe accessories for Class B pipelines shall be 1.6MPa. The minimum nominal pressure of pipe accessories for petroleum gas and oil and gas media with operating temperature higher than 250℃ shall be 2.5MPa.
3.0.7.2 The maximum nominal pressure of pipe accessories for Class A pipelines shall be 2.5MPa.3.0. The types of corrosion caused by the medium in oil and gas collection and pumping on the pipeline system include electrochemical corrosion, chemical corrosion and stress corrosion cracking.
3.0.# The corrosion rate of oil and gas collection and pumping media on the material is divided into three levels: slight corrosion: the corrosion rate is not more than 0.1mm/a, medium corrosion: the corrosion rate is between 0.1mm/a~1. 0mm/a Severe corrosion: Corrosion rate is greater than 1.0mm/#. 3.0.10 When manufacturing the materials of the pipeline system, the type and corrosion rate of the medium to the metal material should be fully analyzed, and the metal material should be reasonably determined, and the following provisions should be met.
3.0.10.1 When the medium has slight corrosion to the selected metal material, this metal material can be selected and a low isolation margin can be used! 3.0.10.2 When the medium has a medium isolation degree to the selected metal material, it should be economically compared and other metal materials with strong corrosion resistance should be selected, or the corrosion margin should be increased.
3.0.10.3 When the medium has a serious corrosion degree to a certain metal isolation material, if there is no effective protection measure, other metal materials with higher corrosion resistance should be selected. 3.0.11 The elongation margin of pipes and fittings in sulfur-containing oil and gas pipeline systems shall comply with the following provisions:
3.0.11.1 For pipeline systems with a working pressure of 8MPa or less and a hydrogen hydride content of 1000mg/m* or less, the corrosion resistance should be 1.5mm. 3.0.11.2 For pipeline systems with a working pressure of 8MPa or less and a hydrogen hydride content of more than 1000mg/m*, the corrosion resistance should be 3.0mm. 3.0.113 The corrosion degree of the gas production pipeline between the first-stage descenders when the gas wells are connected shall be 2~1 ml
3.0.12 For all pipelines that are used in acidic environments as specified in the "Requirements for Materials for Resisting Basic Chemicals" for gas transportation, the material selection shall comply with the relevant provisions of the standard.
Pipe Selection
4.0.1 The selection principles of copper pipes shall comply with the provisions of Article 3.0.6 of this standard; the standard specifications of steel pipes shall comply with the requirements of Table 4.0.1-1 and Table 4.0.1-2: If other types of pipes other than the table are selected, their materials and technical indicators shall be the same as or slightly higher than the corresponding steel pipes in the table. The specific requirements for the selection of steel pipes for various types of pipelines classified in Article 3.0.5 of this standard shall comply with the following provisions.||t t||4.0.1.1C-type pipelines
(1) When the working temperature is lower than 100℃, welded steel pipes for low-pressure fluid delivery should generally be used. However, seamless steel pipes should be used for pipes that may freeze due to ambient temperature, and welded steel pipes for low-pressure fluid delivery should be used for air purification. (2) Steam and hot water pipelines with working temperatures higher than or equal to 100℃ should not be welded.
(3) Seamless steel pipes should be used for heating or drainage pipelines in oil collection processes. 4.0.1.2B-type pipelines should not use welded pipes for low-pressure fluid delivery (including welded pipes). Seamless steel pipes should be used for liquefied petroleum gas and natural gas condensate. Seamless steel pipes should be used for pipelines within the station.
4.0.1.3A-type pipelines must use seamless steel pipes. 4.0.2 For Class B pipelines with working humidity below 0°C, pipes made of copper, copper and its alloys that meet the design pressure requirements can be selected. The standard specifications of the pipes shall meet the requirements of Table 4.0.2. If other types of aluminum pipes outside the table are selected, their technical indicators shall be equal to or slightly higher than the corresponding pipes in the table. 4.0.3 The standard specifications of commonly used cavity pipes shall meet the requirements of Table 4.0.3. If rubber hoses outside the table are used, their technical performance indicators shall be equal to or slightly higher than the corresponding rubber hoses in the table. In addition to meeting the requirements of Article 3.0.6 of this standard, the following requirements shall also be met during selection! 4.0.3.1 The medium operated under positive pressure should use pressure-resistant cavity tube, and the medium operated under negative pressure should use suction rubber kidney; the medium operated under negative and positive pressure should use GB science for delivery and selection, non-dimensional solution tube, oil and gas oil shaft needs solution tube, heat treatment, table 4.0.1-1, applicable to the health care system, and the oil and gas oil shaft needs ... 0450
hot milk skin wet
10-2050
meat, normalizing
no language Lang Wu Jishi CB22oCGctaNia
-40475
10~150
-10~150 material Yong technology infant seeking
NGB15A-89
attached quantity A.1
ICrINiNTi
normalizing 50-10 yuan
not recommended steel
petroleum no natural test
gas with direct current
5240.5200||tt| |General experience method
For Chinese pipelines, straight-end electric
super-stewed basket
for low-pressure filter acid delivery
0195,0216
for training Fengwu Liancun GB01Q235-A
for low-pressure energy delivery
GBMRO235-AF
for welded steel pipe
for Shipu natural building delivery
Guangdong Police Construction City EGB
No. 524, 5280
for injection molding
for pressure fluid delivery
T country Huang Pengli strong welding 5Y5036
seat uses exhaust and suction hoses.
1500/0
4.0.3.2: For medium of type B and type A, pressure-resistant rubber with steel wire reinforcement layer should be used. Name of all alloy steel pipes for foreign order maintenance period. Specification number.
Seamless steel pipe for thermal insulation (#) ASTMACr3
CUONFA48TUION14
Main material
Aluminum pipe and steel pipe for oil and gas processing
5 Joint enterprise management|| tt||Dismantle yellow steel pipe
Draw back steel pipe
Water pipe
Air hose
Gas hose
Motor tank truck oil
Mold rubber hose
For marine oil
Mold rubber hose
Liquefied petroleum gas
Rubber hose
7th phase silk ring Zhu collection pipe
Hog, Hie
Chen oil number
GH I50
GB 1529
Common lumen tubes
Table 4.0.1-2
Temperature application
-100500
10~500
10-300
Applicable range
Standard number
GB 118T
GB1548
GB OHO
GB 10846
Applicable to g
-20~45
—080
Note: The rubber hoses with serial number 1 are all reinforced with pot wire. They can be used for natural gas, liquid and other gas. Please use them in small-sized pipes in cities. The pressure is clear. 2. When the inner weight is 6mm to 30mm
, various types of Kuli and other valves are selected. 5.0.1 The general use of valves shall comply with the requirements of Articles 5.0.2~5.0.8 of this standard in addition to the provisions of Articles 3.0.6 and 3.0.7 of this standard. 5.0.2 General valves should use general valves (see Article 1.0.5 of this standard for reference standards! 20 to 30) standard series products, and can also use machine standard commercial valve products. 5.0.3 In general, the C-type pipeline should use high-quality steel or cast iron. The pipeline with a conveying pressure higher than 0.3MPa and the environment may freeze should use steel valves. The valve skins that play an important role in production should use steel valves. 5.0.4 For the B-type pipeline, steel valves should be used. For the working temperature below 0°C, the valve material should meet the following requirements.
5.0.4.1 For the design temperature of 0°C to -30°C, it is advisable to use high-quality steel valves. 5.0.4.2 For the design temperature of -30°C to -115°C, it is advisable to use low-grade steel (2.5Ni, 3.5NI), aluminum alloy valves and austenitic stainless steel valves. 5.0.4.3 For the design temperature of -1150 to -196°C, it is advisable to use austenitic stainless steel valves and aluminum alloy valves.
50.5A For old pipes, it is forbidden to use long-life iron pipes. 5.0.6 For Class A pipes, special pipes and meshes with high tightness and high safety should be used for Class B pipelines that transport mediums with high fire risk and mediums that are harmful to the human body. 5.0.7 For pipelines that transport commercial mediums, the mesh core and sealing surface should be made of corrosion-resistant materials, except for the specified operating conditions. The seat of the pipeline for auxiliary transportation of sour natural gas should use anti-sludge valves, and the female core sealing material should be diamond-based hard alloy or oxygen-resistant material.
5.0.8 When pipelines with different pressures and elevation conditions are connected, the valve at the connection should be selected from the pipeline with more stringent operating conditions. 6 Selection of flanges, gaskets and fasteners
6.0.1 For flange-connected pipelines, in addition to complying with the provisions of Articles 3.0.6 and 3.0.7 of this standard, the types, materials and pressures of flanges, gaskets and fasteners shall be comprehensively considered and reasonably selected.
6.0.2 The flange types and materials may be selected within the range of the AI and A2 thrusters in Appendix A of this standard, and shall comply with the following requirements: 6.0.2.1 The flange connected to the flange of the pipe of the valve or equipment shall match its sealing surface
6.0.2.2 For Class A pipelines, the four-convex face, groove face or ring-joined face-to-face welding steel method shall be used.
6.0.2.3 For Class B pipelines with a design temperature higher than 200℃, the steel method shall be used, and the liquid oxygen recirculation pipeline shall use the convex face-to-face welding steel flange. 6.0.2.4 Aluminum flanges can be used to connect aluminum pipes or aluminum pipes with alloy steel pipes.
6.0.3 Pipe flange gaskets should be selected from the recommended sample in Table A3 in Appendix A of this standard. In addition to the requirements of Article 6.0.1 of this standard, the following requirements should be met.
6.0.3.1 Gaskets of the same standard series as the flange to be connected and corresponding to the type and nominal pressure of the flange should be used. 6.0.3.2 When using seam-wound gaskets, the four-convex flange should be equipped with inner ring type wound gaskets, and the grooved flange should be equipped with basic type welded gaskets: the convex flange should be equipped with outer ring type wound gaskets, and when the pressure is higher than or equal to 1.5MPa or the sealing requirement is very high, inner and outer ring type wound gaskets should be used. 6.0.3. Asbestos rubber gaskets shall be used for Class C pipelines. 6.0.3.4 The selection of gaskets for Class B pipelines shall meet the following requirements (1) When conveying water, air, oxygen, steam and other media with a pressure less than or equal to 5.14
MPa, asbestos rubber gaskets shall be used.
(2) When conveying oil and gas media, when the design temperature is -40℃ to 200℃ and the design pressure is less than or equal to 4.0MPa, oil-resistant rubber asbestos gaskets should be used. When the design temperature and pressure are higher than this range, wound gaskets or ring gaskets should be used. When the design temperature is lower than -40℃, low-temperature resistant wound gaskets, copper-clad asbestos gaskets, aluminum-clad asbestos gaskets or steel gaskets should be used. (3) At the storage temperature, the maximum gas pressure is equal to or higher than 1.6MPa, and the lock flange of the natural gas refilter and liquefied petroleum gas storage tank should use cable gaskets. 6.0.3.5 For Class A pipelines, ground-wound gaskets should be used. If asbestos rubber sheets are used, the thickness of the gasket should not exceed 1.5mm. 8.0.3.6 For Class A or B pipelines containing high-quality hydrocarbons, stainless steel metal ring gaskets should be used. 6.0.4 The material and type of flange fasteners should be selected within the range recommended in Tables A2 and A4 in Appendix A. In addition to complying with the provisions of Article 6.0.1 of this standard, the following requirements must be met. 6.0.4-1:The material of the explosion grid used with the grease-fired whole piece should be equal to or higher than No. 35 steel.
6.0.4.2, the B-type pipeline for conveying high-quality media should use full-threaded end columns: the A-type pipeline should use full-threaded media columns.
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