This standard is specially formulated to ensure the construction quality of the pneumatic extrusion coating of liquid coatings on steel pipelines and to extend the service life of steel pipelines. This standard is applicable to the pneumatic extrusion coating of liquid coatings on steel pipelines with a nominal diameter of 40 to 300 mm, with the inner surface pre-primed or the inner surface chemically derusted. SY/T 4076-1995 Pneumatic extrusion coating process for liquid coatings on steel pipelinesSY/T4076-1995 Standard download decompression password: www.bzxz.net

Technical process of the pneumatically-pig-sg ueezed liquid innercoating for steel pipeline
SY/ T 4076-95
Editor: Shengli Petroleum Administration Bureau Oil Construction No. 1 Company Approving Department: · China National Petroleum Corporation Petroleum Industry Press
1995 Beijing
1·General
Process flow chart
Construction preparation
Liquid coating
Machinery, job setting and personnel allocation
Construction conditions
Construction pipe section cleaning
Work step flow chart
Excavation tools,
Job setting and personnel allocation
Plane cover diagram
Operation points
Pre-primed construction pipe section inner surface cleaning 6.1
Work step flow chart
Machinery ：Position setting and staffing
Plan layout:
Key points for operation
Overall chemical rust removal on the inner surface of the construction pipe section
Material preparation and testing
Work flow chart·
Machinery, Position setting and staffing
Plan layout
Key points for operation
Pneumatic extrusion coating on the inner surface of the construction pipe section
Work flow chart:
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Machinery: Position setting and staffingbZxz.net
Plan layout
Key points for operation
Quality standards and inspection
Coating patching at the interface of the construction pipe section
Work flow chart
Machinery. Position setting and staffing
Operation points
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Appendix H
Liquid coating inspection record format
Liquid coating internal coating pneumatic extrusion coating construction equipment and tools Liquid flow material internal coating pneumatic extrusion construction Position setting and staffing
Abrasive and primer inspection record format
Prefabricated pipe section pre-coating primer inspection record format Calculation formula for material consumption
Construction pipe section internal coating inspection record format
Terms used in this standard||tt ||Additional explanation
Explanation of the air extrusion coating process for the inner coating of liquid coatings on steel pipelines
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Document of China National Petroleum Corporation
(95) CNPC Technical Supervision No. 156
Notice on the approval and release of the "Safety Regulations for Heating Furnaces for Petroleum Industry" and other 12 oil and gas industry standards To all relevant units:
The "Safety Regulations for Heating Furnaces for Petroleum Industry" and other 11 standards (drafts) have been reviewed and approved and are now approved as oil and gas industry standards for release. The numbers and names of the standards are as follows:
.Serial number
SY 003195
SY/T 0086-95
SYT 407495
SYT 4075--95
SYT 4076-95
SY/T 4077-95
Safety regulations for heating furnaces used in the petroleum industry (replacing SYJ3188)
Electrical insulation standards for cathodic protection pipelines
Cement mortar coating machine coating process for steel pipelines
Centrifugal molding construction process for fly ash cement mortar lining of steel pipelines
Pneumatic extrusion coating process for liquid coating inner coating of steel pipelines
Pneumatic extrusion coating process for cement mortar lining of steel pipelines
SY7T 4078--95
SY T 4079-
SY 7T 408095
SY 4081-95
SY / T 4082--95
Steel pipeline internal coating body coating patching machine patching process
Petroleum and natural gas pipeline crossing project construction and acceptance specifications
Pipeline, storage tank leakage detection method
Steel spherical storage tank seismic identification technical standard Gas field well site equipment and pipeline installation project construction and acceptance specifications
The above standards shall be implemented from September 1, 1995. China National Petroleum Corporation
March 11, 1995
1 General
1.01 This standard is specially formulated to ensure the construction quality of the internal coating of the saw steel pipeline by air conveying and extrusion coating and extend the service life of the steel pipeline. 1.0.2 This standard applies to the pneumatic extrusion coating of liquid coatings on steel pipes with a nominal diameter of 40 to 300 mm, which have been pre-primed or chemically derusted. The ambient temperature for pneumatic extrusion coating of liquid coatings shall not be lower than 5°C, and the relative humidity shall not be greater than 85%.
Guide standards:
GB 172079
Test method for adhesion of paint film
GBT 1723—93
GB 172479
GB 1725-79
GB 1728-79
Test method for viscosity of paint
Test method for fineness of paint
Test method for solid content of paint
Test method for drying time of paint film and putty film GBT 173I-
GB / T 1732
GB /T 1733
GB 176393
Determination of flexibility of paint films
Determination of impact resistance of paint films
Determination of water resistance of paint films
Determination of chemical resistance of paint films
GB7T 177191
GB 318682
GB 6739--86
GBT 8923
SY 0063-92
SY 0066-92
SYJ 402288
Determination of neutral salt spray resistance of paints and varnishes Sampling of coating products
Determination of film hardness by pencil method
88Rust grade and rust removal grade of steel surface before painting Test method for leak detection of pipeline anticorrosion layer
Standard for non-destructive measurement of thickness of steel pipe anticorrosion layer (magnetic oilfield gathering and transportation pipeline construction and acceptance specification
SYJ4047-90Construction and acceptance of epoxy coal tar anticorrosion layer for buried steel pipeline Acceptance specification
JGJ52-92 Quality standard and inspection method for ordinary concrete sand 1.0.5 The construction of the inner layer of liquid coating on steel pipelines shall comply with the provisions of this standard and the relevant national standards in force. 2.0.1
The symbols and instructions used in this standard shall comply with the provisions of Table 2.0.1. Special number explanation
Construction process
Construction and self-inspection
Steel Pipe handling
Operation time
Senior inspection point special inspection
Process flow chart
The process flow of steel pipeline liquid coating air conveying extrusion coating construction should comply with the provisions of Figure 3.0.1.
Construction preparation
Filling pipe
Section pipe
Item to be given to the court for the whole construction
Section surface cleaning speed or
Section surface warning body
Chemical removal
City Engineering Section
Inner Xu Layer Wind
Transportation
City Engineering Management
Interface
Inner Operation
Layer Patching
Figure 301
Construction Process of Wind-Conveyed Extrusion Coating of Liquid Coating Internal Coating Pavilion 4 Construction Preparation
4.1 Liquid Coating
4.1.1 The liquid coating used in the construction of wind-conveyed extrusion coating of liquid coating internal coating shall comply with the design regulations. If there is no regulation in the design, the construction unit shall negotiate with the user to select liquid coating with performance that meets the requirements of Table 4.1.1.
4.1.2 Liquid coating must have product logo, quality certificate, factory date and storage period. Expired coating is strictly prohibited.
4.1.3 Before using each batch of liquid coatings, samples shall be taken according to the sampling plan specified in "Sampling of coating products".
The coating's appearance, viscosity, drying time, solid content and adhesion shall be inspected. When there is doubt about other performance indicators, the corresponding items shall also be inspected. The inspection methods and inspection results shall comply with the provisions of Table 4.1.1 of this standard. The inspection results shall be filled in the "Liquid Coating Inspection Record Form" given in Appendix A of this standard and filed in the construction unit.
If the liquid coating sampled is unqualified, double samples shall be taken for re-inspection. If it is still unqualified, the batch of coating is unqualified.
4.2 Machinery, post setting and personnel allocation
The machinery used for the pneumatic extrusion coating construction of liquid coating can be selected in accordance with the requirements of this standard.
4.2.2 The post setting and personnel allocation for the pneumatic extrusion coating construction of liquid coating can be selected in accordance with Appendix C of this standard
Viscosity (Pa·s)
Fineness (m)
Adhesion (grade)
Flexibility (mm)||t t||Impact resistance (J)
Hardness (2H pencil)
Drying time (h)
Solid content (%)
Performance index of liquid coating
Performance index
(primer, topcoat),
No grain
Component A
Component B
10%Na0H
30%H,SO
Resistance to chemical reagents (180d)
10%NaCl
Resistance to heat fog (500h)
Resistance to sewage (100℃, three months)
4.3 Construction conditions
Test method
GB/T 1723
GB1724
GB 1720
GB/ T 1731
GB/T 1732
GB 6739
GB1728
GB1725
GB 1763
GB/T 1771
GET1733(Method Z)
4.3.1 Before construction, the pipeline should be divided into construction sections. The construction section should be composed of prefabricated sections with the same diameter and wall thickness. There should be no tees or valve groups in the construction section. 4.3.2 Before construction, the compressed air should be inspected: place a white cloth or a white painted target plate in the compressed air flow for 1 stroke and observe with the naked eye. If there is no oil stain, water droplets or black spots on the white cloth or the white painted target plate, the compressed air is qualified. 4.3.3 For the construction section pre-coated with primer, the operation should be carried out according to the process flow 6
and the next step specified in Figure 4.3.3
Steel arm inspection
Prefabricated section
Prefabricated section
Inner surface spraying||tt ||Rust removal and finger closing
End sealing
Ring system section
Pre-road bottom rate
Short-term storage
Urban engineering pipe
Section installation
Construction pipe installation cleaner
Figure 4.3,3 Pre-priming construction pipe section installation process flow chart 4.3.3.1 Steel pipes must have quality certificates, and should allow 5% of all steel pipes used in the project to allow external diameter deviation, wall thickness deviation, roundness, and curvature inspection: The allowable deviation of steel pipes should meet the requirements of 4.3.3: and check the surface quality of each pipe: There should be no cracks on the surface of the steel pipe, and the local depression should not be greater than 12.5% ​​of the wall thickness 4.3.3.2 Steel pipes with a length of less than 7m are placed in the prefabrication plant to be extended into prefabricated pipe sections. The inner diameter of each steel pipe should be measured before the length is extended, and the pipe ends with similar inner diameters should be welded together. When prefabricated pipe sections are extended, mixed gas shielded welding should be used for primer. The length of the prefabricated pipe section should not exceed
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