SY/T 4086-1995 Technical specification for design and construction of pipeline networks on beach and sea structures
Some standard content:
Standard of the Petroleum and Natural Gas Industry of the People's Republic of China Technical specification of design and construction of pipe network on structures in beach-shallow sea S1 T 4086-95
Editor: Shengli Petroleum Administration Bureau Survey and Design Institute Shengli Petroleum Administration Bureau Oil Construction--Company
Approving Department: China National Petroleum Corporation Petroleum Industry Press
1995 Beijing
Pipeline Design
Design Pressure and Temperature
Pipeline Wall Original Calculation
Pipeline Layout
Pipe Valve Accessories
2.5 Expansion and Deflection-
Anti-corrosion and Insulation
Pipeline Protection
Pipeline System Installation Design Requirements
Inspection of Materials and Accessories
Pipe Fittings Manufacturing and Pipeline Installation
General Rules
Pipeline Accessories Manufacturing
Pipeline Installation
General Provisions
Welding Construction
Welding Inspection
Pressure test,
Anti-corrosion and thermal insulation
Purge (sweep)
Anti-corrosion and thermal insulation
Project acceptance
Appendix A
Inquiry for the use of this specification
Additional instructions
(21)
(22)
(24)
(25)
Document of China National Petroleum Corporation
(95) CNPC Technical Supervision No. 731
Notice on the approval and release of 26 oil and gas industry standards including "Standard for Investigation Methods of Corrosion and Protection of Steel Pipelines and Storage Tanks"
To all relevant units:
"Standard for Investigation Methods of Corrosion and Protection of Steel Pipelines and Storage Tanks" and other 26 oil and gas industry standards (draft) have been reviewed and passed: they are now approved as oil and gas industry standards and are published. The numbers and names of the various standards are as follows: 1
SY/ T 0087--95
SYT 0545-1995
SY/T 4013-95
SY/T 4041-95
Standard for investigation method of corrosion and protection of steel pipelines and storage tanks
Determination of thermal characteristic parameters of wax precipitation in crude oil
Scanning calorimetry
Technical standard for vinyl-friendly anti-corrosion layer of buried steel pipelines (replacing SYJ4013-87)
Technical acceptance specification for installation of special wet steam generators for oil fields (replacing SYI4041-~89)
SY T 4084-95
SYT 4085-95
SY 4086-95
$Y/T 4087 -95
SY/ T 408895
SY/T 4089-95
SY/ T 4090-95
SY7 T 4091 95
SY7T 409295
SY7 T 4093---95
SY/T 4094-95
SY/ T 409595
SY/T 409695
SY /T 4097 -95
SY T 4098- 95
SX/T 4099-95
SY /T 4100-95
SYT 4101 -95
SY /T 4102-95
SY /T 4103-1995
SY 4104- 95
Technical specification for beach environmental conditions and loads
Technical specification for oil and gas gathering and transportation in Weihai Oilfield
Beach structures! Technical specification for pipeline design and construction
Technical specification for ventilation and air conditioning of beach oil projects Technical specification for water supply and drainage of beach oil projects Technical specification for gas in Weihai oil projects
Technical specification for power generation facilities of Xiongyou oil projects, technical specification for corrosion protection of beach oil projects
Technical specification for thermal insulation of beach oil projects
Technical specification for selection and installation of lifting equipment for beach oil facilities
Technical specification for design and construction of shallow-water fixed steel platforms
Technical specification for design and construction of shallow-water mobile steel platforms||tt| |Technical specification for wellhead protection device for offshore oilfields Technical specification for design and construction of sloped sandstone artificial island structure on offshore coast
Technical specification for design and construction of steel formwork-concrete artificial island structure on offshore coast
Technical specification for design and construction of offshore seawall
Technical specification for survey of offshore engineeringbzxZ.net
Technical specification for exploration of offshore rock formations
Specification for inspection and installation of valves
Welding and acceptance of steel pipelines
Quality inspection and assessment standard for petroleum construction projects Pipeline crossing and spanning projects
SYT 008895
Technical standard for cathodic protection of outer wall of bottom of steel storage tank
The above standards shall come into force on June 1, 1996. China National Petroleum Corporation
December 18, 1995
1.0.1 In order to meet the needs of design and installation of pipeline networks on beach structures, and to ensure safety, reliability, advanced technology, economic rationality and environmental protection, this specification is specially formulated. 102 This specification is used for the design, construction and acceptance of the new part of the new construction and expansion and reconstruction of carbon steel pipeline networks on beach structures. 1.03 Reference standards:
GB235-82 Industrial Pipeline Engineering Construction and Acceptance Specification GBJ236-82 Field Equipment, Industrial Pipeline Welding Engineering Construction and Acceptance Specification SYT4089-95 Beach Oil Engineering Electrical Technical Specification SY7T 4091-95 Anti-corrosion Technical Specification for Beach and Sea Petroleum Engineering SY, T409295 Thermal Insulation Technical Specification for Beach and Sea Petroleum Engineering SY5747--1995 Safety Rules for Beach and Sea Petroleum Construction Engineering 1.0.4 In addition to implementing this specification, the design, construction and acceptance of pipeline networks on beach and sea structures shall also comply with the provisions of the relevant current national standards (specifications). 2 Pipeline Design
2.1 Design Pressure and Temperature
Determine the pipeline design pressure and comply with the following provisions: 2.1.1
The design pressure of the pipeline and accessories shall be based on the system 2.1.1.2 The design pressure of the water supply pipe and the upper and lower sewage pipes connected to the boiler shall be 1.25 times the boiler design pressure, and shall not be less than the boiler design pressure plus 0.7MPa. 2.1.1.3 The design pressure of the discharge pipe of the air compressor and positive displacement pump shall be the maximum set pressure of the safety valve; the design pressure of the discharge pipe of the centrifugal pump shall be the highest pressure on the performance curve.
2.1.1.4 The set pressure of the oil and gas pipeline shall be determined according to the pipeline operating pressure and back pressure, and shall not be less than 1.6MPa.
2.1.2 The design temperature of the pipeline shall be determined according to the process requirements. 2.2 Calculation of pipe wall thickness
The pipe wall thickness shall be calculated according to the following formula
2.2.1.1 For steel pipes subjected to pressure, the minimum calculated wall thickness shall not be less than that calculated according to the following formula:
Wu Zhong-minimum calculated wall thickness, mm:
oc-basic calculated wall thickness, mm;
(2.2.1 1)
C-corrosion allowance, mm (Under normal circumstances, 1.0mm for fresh water pipelines, 1.5mm for seawater pipelines, 1.5mm for crude oil pipelines, and 0.5mm for other pipelines)
For pipelines passing through tanks, the corrosion allowance shall be appropriately increased according to the external medium. If the pipe is effectively protected. The corrosion allowance can be reduced by up to 50%. When special hooks with sufficient corrosion resistance are used, the corrosion allowance can be reduced or even as low as zero.
2.2.1.3 Basic calculation of steel pipe wall thickness 5 should be calculated by the following formula: PD
0o=2(mΦ+ p
Where Oh
-design pressure, MPa;
\outer diameter of steel pipe, mm;
allowable stress, Nmm
(2.2.1 - 2)
weld coefficient, for seamless steel pipe, electric resistance welded steel pipe and high frequency welded steel pipe, medium=1, for seamed steel pipe (including threaded steel pipe): double-sided welding Φ=0.85; single-sided welding threaded steel pipe, when the steel material is A, F, medium=0.75, when 16Mn steel, medium=0.65.
The allowable stress of steel pipe (the most important value Cq calculated by the following formula should be taken
(2.2.1— 3)
(2.2.1- 4)
(2.2.1 — 5)
Minimum tensile strength of material at room temperature, N/mtn2;Minimum yield strength of material at design temperature, N/mm2:Average stress that material will break within 10000h at design temperature. Nmm.
The minimum calculated wall thickness of pipe calculated by formula 2.2.1-1 does not take into account the manufacturing negative deviation. When there is a manufacturing negative deviation, the wall thickness of the pipe shall not be less than the value calculated by the following formula: sm
Formula om pipe wall thickness. mm
The percentage of the ratio of the manufacturing negative deviation to the nominal wall thickness of the pipe. 2.3 Pipeline layout
Pipeline layout shall comply with the following provisions:
Ensure personnel safety and have appropriate operation and maintenance channels: compact layout, smooth flow, small flow resistance. Cables, signal cables, etc. should be arranged with pipelines. If there are conflicts in the layout of various pipelines, the following principles shall be followed: 2.3.2.1 Temporary pipelines shall be replaced by permanent pipelines: small diameter pipelines shall be replaced by large diameter pipelines: pressure flow pipelines shall be replaced by gravity flow pipelines that are easy to bend and those that are not easy to bend; small pipelines shall be replaced by engineering pipelines. The minimum clearance between pipelines shall comply with the provisions of Table 2.3.3. However, for pipelines equipped with flanges, the clearance between the outer edge of the flange and the adjacent pipeline shall not be less than 50mm. Minimum clearance between pipelines m Gas pipes Compressed air pipes Thermal pipes Natural gas pipes Note: Regardless of whether the pipeline is insulated or not, the minimum clearance between crude oil pipelines shall comply with the provisions of Table 2.3.3. Table 2.3.3
Compressed air pipe
2.3.4 Pipes that transport flammable fluids shall not be connected to other pipes. 2.35 Cold and hot medium pipes shall be separately covered, and the hot medium pipe wrapped with protective layers shall not be placed under the cold medium pipe. The pipes containing flammable media shall not be placed above or near the distribution board. The pipes containing flammable media shall not be placed on the surface and the sounder shall be avoided. Appropriate protective measures shall be taken according to relevant regulations.
6 The amount of condensation on the pipes shall be minimized. Reliable protective covers shall be installed at places that are vulnerable to collision and damage, which are convenient for disassembly, assembly and maintenance. 2.3.7
Sewage pipes shall not be placed in living areas and mechanical areas. 2.4 Pipe and Valve Accessories
Non-metallic valves and cast iron parts shall not be used in pipelines. Needle valves with a nominal diameter of less than 12m should use Austenitic stainless steel. In pipelines that transport corrosive materials, valves with steel bodies with small corrosion resistance and anti-corrosion treatment on the surface should be selected. 2.4.1.4
When the operating temperature of the pipeline exceeds 0, ball valves should not be used. 2.4.1.5 Ball valves and valve stems cannot be used for throttling. Unprotected rising stem valves should not be used in pipelines. The selected valves should be made of elastic sealing materials according to the physical properties and temperature of the conveying medium. 2.4.2 Pipes, pipe fittings and connections Galvanized steel pipes, welded steel pipes or seamless steel pipes should be selected according to different uses. Pipes with a diameter greater than DA40 should be welded, and those with a diameter less than DA40H and a working pressure below 1.0MPa can be threaded. 2.4.2.3 Bolts and screws of flanges should be metal-plated or resin-coated for protection. 2.5.1 Expansion and deflection The thermal expansion of pipeline expansion should be calculated as follows: AL = (- )
Thermal elongation of the pipeline: 111
The average linear expansion coefficient of the pipe with 0 as the base point, 1/℃: The calculated length of the pipeline, 111
The temperature of the pipeline when it is installed, ℃;
The average temperature of the conveying medium, ℃.
The pipeline should be installed with compensators as needed, and the pipelines between compensators should be fixed in a way that avoids the generation of sparks:
The pipelines fixed in the dangerous area should prevent the generation of sparks. The pipelines on the platform should use natural compensation
The compensation amount of the compensator should meet the expansion and contraction requirements of the pipeline. The pipelines between the compensators should be strength-checked according to the following formula: q『］
武中o,
The total axial stress of the pipeline, MPa.
2.5.5 The distance between the pipeline supports or hangers should not cause the pipeline to produce too much dust. The maximum allowable spacing should be the smaller value determined by the strength and stiffness conditions of the pipeline.
Anti-corrosion and thermal insulation
For protection.
Pipelines on platforms (artificial islands) E should have anti-corrosion coatings on their outer surfaces. Pipelines that transport corrosive media: internal anti-corrosion measures should be taken on their inner surfaces. 2.6.1-3 Anti-corrosion measures should be taken into account when implementing anti-corrosion measures (1) Pipeline operating temperature:
! 2] Pipeline installation location,
(3) Possible marine environment corrosion
[4] Difficulty of maintenance
2.6.1.4 When it is difficult to apply internal coating to the inner surface of the crude oil pipeline, the following anti-corrosion measures should be adopted:
(1) Use corrosion inhibitors:
(2) Select corrosion-resistant pipes.
2.6.1.5 To prevent corrosion in water pipes, the following measures should be adopted: (deoxidation or oxidation
(2) Chemical treatment (addition of corrosion inhibitors, fungicides and control of pH value) (3) Anti-corrosion coating and lining
2.6.1.6 When selecting materials for pipes, valves and pipe fittings, electrochemical corrosion should be avoided: the same pipe should use metal materials with similar potentials. 2.6.1.7 When metal pipes and equipment are connected, if the potential difference is too large, insulation isolation measures should be taken.
2.6.1.8 For pipes that may have sulfide stress corrosion cracking, the selected pipe materials and the chemical properties of the welding materials should be carefully considered. Chemical composition and strength should be able to prevent sulfide stress corrosion.
2.6.1.9 In addition to implementing this specification, the corrosion protection of pipelines shall also comply with the relevant provisions of the "Technical Specifications for Corrosion Protection of Beach and Sea Petroleum Engineering". 2.6.2 Insulation
For pipelines that transport high-temperature or easily condensed and frozen media, flanges and valves should be insulated, and the insulation layer of flanges and valves should be easy to maintain. 2.6.2.2
The pipeline system must be cleaned, pressure tested and skin-proofed before insulation. The insulation material should be non-flammable or flame-retardant. A protective layer should be added outside the pipeline insulation layer.
In addition to implementing this specification, the insulation of pipelines shall also comply with the "Technical Specifications for Corrosion Protection of Beach and Sea Petroleum Engineering".4 Pipe valve accessories
Non-metal valves and cast iron parts shall not be used in pipelines. Needle valves with a nominal diameter of less than 12m should use Austenitic stainless steel. In pipelines that transport corrosive materials, use valves with small corrosion resistance and steel valve bodies that have been treated with anti-corrosion. 2.4.1.4
When the operating temperature of the pipeline exceeds 0, ball valves should not be used. 2.4.1.5 Ball valves and valve stems cannot be used for throttling. Unprotected rising stem valves should not be used in pipelines. The selected valves should be made of elastic sealing materials according to the physical properties and temperature of the conveying medium. 2.4.2 Pipes, pipe fittings and connections Galvanized steel pipes, welded steel pipes or seamless steel pipes should be selected according to different uses. Pipes with a diameter greater than DA40 should be welded, and those with a diameter less than DA40H and a working pressure below 1.0MPa can be threaded. 2.4.2.3 Bolts and screws of flanges should be metal-plated or resin-coated for protection. 2.5.1 Expansion and deflection The thermal expansion of pipeline expansion should be calculated as follows: AL = (- )
Thermal elongation of the pipeline: 111
The average linear expansion coefficient of the pipe with 0 as the base point, 1/℃: The calculated length of the pipeline, 111
The temperature of the pipeline when it is installed, ℃;
The average temperature of the conveying medium, ℃.
The pipeline should be installed with compensators as needed, and the pipelines between compensators should be fixed in a way that avoids the generation of sparks:
The pipelines fixed in the dangerous area should prevent the generation of sparks. The pipelines on the platform should use natural compensation
The compensation amount of the compensator should meet the expansion and contraction requirements of the pipeline. The pipelines between the compensators should be strength-checked according to the following formula: q『］
武中o,
The total axial stress of the pipeline, MPa.
2.5.5 The distance between the pipeline supports or hangers should not cause the pipeline to produce too much dust. The maximum allowable spacing should be the smaller value determined by the strength and stiffness conditions of the pipeline.
Anti-corrosion and thermal insulation
For protection.
Pipelines on platforms (artificial islands) E should have anti-corrosion coatings on their outer surfaces. Pipelines that transport corrosive media: internal anti-corrosion measures should be taken on their inner surfaces. 2.6.1-3 Anti-corrosion measures should be taken into account when implementing anti-corrosion measures (1) Pipeline operating temperature:
! 2] Pipeline installation location,
(3) Possible marine environment corrosion
[4] Difficulty of maintenance
2.6.1.4 When it is difficult to apply internal coating to the inner surface of the crude oil pipeline, the following anti-corrosion measures should be adopted:
(1) Use corrosion inhibitors:
(2) Select corrosion-resistant pipes.
2.6.1.5 To prevent corrosion in water pipes, the following measures should be adopted: (deoxidation or oxidation
(2) Chemical treatment (addition of corrosion inhibitors, fungicides and control of pH value) (3) Anti-corrosion coating and lining
2.6.1.6 When selecting materials for pipes, valves and pipe fittings, electrochemical corrosion should be avoided: the same pipe should use metal materials with similar potentials. 2.6.1.7 When metal pipes and equipment are connected, if the potential difference is too large, insulation isolation measures should be taken.
2.6.1.8 For pipes that may have sulfide stress corrosion cracking, the selected pipe materials and the chemical properties of the welding materials should be carefully considered. Chemical composition and strength should be able to prevent sulfide stress corrosion.
2.6.1.9 In addition to implementing this specification, the corrosion protection of pipelines shall also comply with the relevant provisions of the "Technical Specifications for Corrosion Protection of Beach and Sea Petroleum Engineering". 2.6.2 Insulation
For pipelines that transport high-temperature or easily condensed and frozen media, flanges and valves should be insulated, and the insulation layer of flanges and valves should be easy to maintain. 2.6.2.2
The pipeline system must be cleaned, pressure tested and skin-proofed before insulation. The insulation material should be non-flammable or flame-retardant. A protective layer should be added outside the pipeline insulation layer.
In addition to implementing this specification, the insulation of pipelines shall also comply with the "Technical Specifications for Corrosion Protection of Beach and Sea Petroleum Engineering".4 Pipe valve accessories
Non-metal valves and cast iron parts shall not be used in pipelines. Needle valves with a nominal diameter of less than 12m should use Austenitic stainless steel. In pipelines that transport corrosive materials, use valves with small corrosion resistance and steel valve bodies that have been treated with anti-corrosion. 2.4.1.4
When the operating temperature of the pipeline exceeds 0, ball valves should not be used. 2.4.1.5 Ball valves and valve stems cannot be used for throttling. Unprotected rising stem valves should not be used in pipelines. The selected valves should be made of elastic sealing materials according to the physical properties and temperature of the conveying medium. 2.4.2 Pipes, pipe fittings and connections Galvanized steel pipes, welded steel pipes or seamless steel pipes should be selected according to different uses. Pipes with a diameter greater than DA40 should be welded, and those with a diameter less than DA40H and a working pressure below 1.0MPa can be threaded. 2.4.2.3 Bolts and screws of flanges should be metal-plated or resin-coated for protection. 2.5.1 Expansion and deflection The thermal expansion of pipeline expansion should be calculated as follows: AL = (- )
Thermal elongation of the pipeline: 111
The average linear expansion coefficient of the pipe with 0 as the base point, 1/℃: The calculated length of the pipeline, 111
The temperature of the pipeline when it is installed, ℃;
The average temperature of the conveying medium, ℃.
The pipeline should be installed with compensators as needed, and the pipelines between compensators should be fixed in a way that avoids the generation of sparks:
The pipelines fixed in the dangerous area should prevent the generation of sparks. The pipelines on the platform should use natural compensation
The compensation amount of the compensator should meet the expansion and contraction requirements of the pipeline. The pipelines between the compensators should be strength-checked according to the following formula: q『］
武中o,
The total axial stress of the pipeline, MPa.
2.5.5 The distance between the pipeline supports or hangers should not cause the pipeline to produce too much dust. The maximum allowable spacing should be the smaller value determined by the strength and stiffness conditions of the pipeline.
Anti-corrosion and thermal insulation
For protection.
Pipelines on platforms (artificial islands) E should have anti-corrosion coatings on their outer surfaces. Pipelines that transport corrosive media: internal anti-corrosion measures should be taken on their inner surfaces. 2.6.1-3 Anti-corrosion measures should be taken into account when implementing anti-corrosion measures (1) Pipeline operating temperature:
! 2] Pipeline installation location,
(3) Possible marine environment corrosion
[4] Difficulty of maintenance
2.6.1.4 When it is difficult to apply internal coating to the inner surface of the crude oil pipeline, the following anti-corrosion measures should be adopted:
(1) Use corrosion inhibitors:
(2) Select corrosion-resistant pipes.
2.6.1.5 To prevent corrosion in water pipes, the following measures should be adopted: (deoxidation or oxidation
(2) Chemical treatment (addition of corrosion inhibitors, fungicides and control of pH value) (3) Anti-corrosion coating and lining
2.6.1.6 When selecting materials for pipes, valves and pipe fittings, electrochemical corrosion should be avoided: the same pipe should use metal materials with similar potentials. 2.6.1.7 When metal pipes and equipment are connected, if the potential difference is too large, insulation isolation measures should be taken.
2.6.1.8 For pipes that may have sulfide stress corrosion cracking, the selected pipe materials and the chemical properties of the welding materials should be carefully considered. Chemical composition and strength should be able to prevent sulfide stress corrosion.
2.6.1.9 In addition to implementing this specification, the corrosion protection of pipelines shall also comply with the relevant provisions of the "Technical Specifications for Corrosion Protection of Beach and Sea Petroleum Engineering". 2.6.2 Insulation
For pipelines that transport high-temperature or easily condensed and frozen media, flanges and valves should be insulated, and the insulation layer of flanges and valves should be easy to maintain. 2.6.2.2
The pipeline system must be cleaned, pressure tested and skin-proofed before insulation. The insulation material should be non-flammable or flame-retardant. A protective layer should be added outside the pipeline insulation layer.
In addition to implementing this specification, the insulation of pipelines shall also comply with the "Technical Specifications for Corrosion Protection of Beach and Sea Petroleum Engineering".
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