SY/T 4071-1993 Pipeline Downward Welding Procedure SpecificationSY/T4071-1993 Standard download decompression password: www.bzxz.net

Standard of the People's Republic of China for the petroleum and natural gas industry
Welding Procedures for Vertical Down Stick Welding of Pipes
SY/T4071-93
Editor: China National Petroleum Corporation Infrastructure Engineering BureauApproval: China National Petroleum CorporationImplementation date: March 1, 1994
Petroleum Industry Press
1993·Beijing
Welding materials
Storage of welding materials and pre-welding treatment
Coal connection equipment
Welding process assessment and welder assessment.
Pre-welding preparation.
Welding construction
8 Weld inspection and defect repair
Appendix A
Common Foreign steel pipes
Selection conditions for downward welding rods
Appendix B
Appendix C
Explanation of terms used in this code
Additional explanation
Document of China National Petroleum Corporation
(93) Zhongyoujizi No. 598
Notice on the approval and release of 27 oil and gas industry standards including "Code for Preparation of Petroleum Surface Engineering Design Documents"
To all relevant units and relevant petroleum professional standardization technical committees: The draft of 27 standards including "Code for Preparation of Petroleum Surface Engineering Design Documents" has been reviewed and passed, and is now approved as oil and gas industry standards. The numbers and names of the standards are as follows:
1SY0009--93 Code for Preparation of Design Documents for Petroleum Surface Engineering (replacing SYJ9-83
SY0055-93
SY 007293
SY 0073--93
0074-93
Measurement Specification for Long-distance Oil and Gas Pipeline (replacing SYJ5583)
Test method for high-temperature cathodic disbonding of pipeline anti-corrosion coatingsStandard for test method for materials of pipeline anti-glass layer patchesStandard for test method for insulation and sealing of pipeline anti-corrosion layer patchesSY/T 007693
SY/T 0077--93
SY/T 0523-93
SY 402493
Design specification for natural gas dehydration
Design specification for natural gas condensate recovery
Oilfield water treatment filter
General rules for quality inspection and assessment of petroleum construction projects (replace SYJn4024-882
SY 4025-93 1
Quality inspection and assessment standard for petroleum construction projects Construction projects (replace SYJn4025-88)
11SY4026--93 Quality inspection and assessment standard for petroleum construction projects Storage tank projects (replace SYJn4026-88)
12 SY4027-93
Quality inspection and assessment standard for petroleum construction projects Installation projects of steel process pipelines within stations (replace SYJn4027-88)13SY 4028-93
Quality inspection and assessment standard for petroleum construction projects Equipment installation projects (replace SYJn 4028-88)
SY4029--93
Petroleum construction project quality inspection and assessment standard Long-distance pipeline line project (replacement of $n402988
16SY4030.1-93 Petroleum construction project quality inspection and assessment standard Electrical engineering (overhead power line engineering)
(replacement of SYJn4030-88)
16SY4030.293
Petroleum construction project quality inspection and assessment standard Electrical engineering (electrical device installation Engineering)
(replace SYJn40388)
SY403193 Petroleum Construction Engineering Quality Inspection and Assessment Standard Automation Instrument 17
Installation Engineering (replace SYJn4031-88)
SY.4033-93 Petroleum Construction Engineering Quality Inspection and Assessment Standard Road Engineering 18
(replace SYJn4033-88)
19SY4034-93 Petroleum Construction Engineering Quality Inspection and Assessment Standard Bridge Engineering Replace sfJn 403488
SY403593 Petroleum Construction Engineering Quality Inspection and Assessment Standard Heating, Ventilation, Water Supply and Drainage Installation Engineering (Replace SYJn4035—→88)SY4037—93
Petroleum Construction Engineering Quality Inspection and Assessment Standard Oil Refinery Construction Project (Replace SYJ4037—89)
SY4038—93
Petroleum Construction Engineering Quality Inspection and Assessment Standard Gas Field Construction Project (Replace SY4083-—92)
SY4063--93 Petroleum Oilfield gathering and transportation pipeline engineering (replacing SY4053-92)
24SY/T4068-93 Oilfield construction project quality inspection and assessment standard Oilfield gathering and transportation pipeline engineering (replacing SY4053-92)
24SY/T4068-93 Oilfield construction project quality inspection and assessment standard Anticorrosion and heat preservation steel pipe production
SY/T4069-93 Oilfield construction project quality inspection and assessment standard Oilfield steel container production
SY4070-93 Oil and gas pipeline crossing project construction and acceptance specification SY/T4071-93 Pipeline downward welding process specification The above standards shall be implemented from March 1994. China National Petroleum Corporation
September 9, 1993
1 General provisions
1.0.tThis specification is specially formulated to guide the pipeline downward welding construction, unify technical requirements, improve welding efficiency and ensure welding quality. 1.0.2 This code is applicable to the manual arc welding of all-position downward welding of the butt welds of oil and gas pipelines with a diameter of not less than Φ159mm and made of carbon steel and ordinary low-alloy steel. The downward welding of pipelines for other media can refer to this code. 1.0.3 In addition to complying with the provisions of this code, the downward welding construction of pipelines shall also comply with the relevant construction and acceptance specifications of the state and the industry. 2 Pipe materials
2.0.1 Steel pipes for oil and gas transportation shall comply with the requirements of the following standards: GB9711-88 "Spiral seam buried welded steel pipes for oil and natural gas transportation pipelines"
SY5297--91 "Straight seam electric resistance welded steel pipes for oil and natural gas transportation pipelines": GB8163--87 "Seamless steel pipes for conveying fluids". 2,0.2 When using foreign steel pipes, they shall comply with the provisions of Appendix A. 2
3 Welding materials
3.0.1 The welding rods used for all-position downward welding of pipelines shall meet the following standards and requirements. 3.01.1 The performance of the welding rods shall meet the requirements of GB5117-85 "Carbon Steel Welding Rods" - GB5118-85 "Low Alloy Steel Welding Rods". 3.0.1.2 The welding process performance of the welding rods shall meet the requirements of all-position downward welding of pipelines.
The selection of foreign welding rods for all-position downward welding of pipelines shall meet the requirements of Appendix B.
3.0.3 Selection of welding rods
3.0.3.1 Cellulose-type downward welding rods are suitable for oil and water pipelines, and low-hydrogen-type downward welding rods are suitable for gas pipelines.
3.0.3.2 Low-hydrogen-type welding rods shall be used for the fixed ports connecting two long pipe sections and for welding pipes and pipe fittings.
4 Storage of welding materials and pre-welding treatment
4.0, 1 Downward-facing electrodes for pipeline welding must have product certificates and quality certificates of the same batch number.
4.0.2 Downward-facing electrodes must not be corroded by moisture, rain, snow, frost, oil and other harmful substances before use, and should be stored in a dry and ventilated room. 4.0.3 Downward-facing electrodes should be dried according to the instructions before use. If the instructions are unclear, they should be dried according to the following requirements. 4.0.3.1 The drying temperature of low-hydrogen downward-facing electrodes is 360-400C, and the constant temperature time is 1 to 2h.
4.0.3.2 The drying temperature of ultra-low-hydrogen downward-facing electrodes is 400-450*C, and the constant temperature time is 1 to 2h.
: 4.0.3.3 Cellulose type downward welding rods should be dried if they are not well packaged or damp. The drying temperature is 70-80°C and shall not exceed 100°C. The constant temperature time is 0.5~~1h.
4.0,4 A dedicated person shall be responsible for the drying of welding rods and make detailed drying records. 4.0.5 The dried low-hydrogen and ultra-low-hydrogen downward welding rods shall be stored in a constant temperature box with a temperature of 100-50° and can be taken out as needed.
.0.6 The low-hydrogen and ultra-low-hydrogen downward welding rods used on site shall be stored in a good performance insulation cylinder for no more than 4 hours. 4.0.7 The downward welding rods that are not used up on the construction site on the same day shall be recycled and stored and used first after re-drying. The number of re-drying shall not exceed two times. .0.8 The downward welding rods with coating cracks, shedding and other problems that affect the welding quality shall not be used for pipeline welding.
5Welding equipment
5.0.「For on-site downward welding of pipelines, according to the welding material requirements and construction conditions, a DC flap welding machine should be used.
5.0, 2 The performance of the welding machine must be stable, and the power and other parameters should be able to meet the welding conditions. Welding process assessment and welder examination
6.0.1 The welding process assessment shall be carried out in accordance with SY4062-92 "Oil and Gas Pipeline Welding Process Assessment Method". The welding process assessment shall include the requirements for defect repair. 6.0.2 The downward welding welder examination shall be carried out in accordance with the "Storage Tank and Pipeline Welder Examination Rules".
7 Hui welding
7.1 Preparation before welding
7.1.1 Before the downward welding of the pipeline, the downward welding and defect repair process regulations shall be formulated according to the welding process assessment.
7.1.2 Electric welders participating in pipeline construction must hold a valid welder examination certificate.
7.1 .3 Before welding the pipeline, the oil, rust, moisture, sand, slag after gasification, scale and other debris on the 50mm surface of both sides of the groove, as well as the machining burrs on the inner side of the groove should be cleaned up, so that the inner and outer surfaces of the groove and both sides with a range greater than 10mm can show the metallic luster.
7.1.4 The size of the pipe mouth assembly should be checked according to the requirements of Table 7, 1.4. The size of the pipe mouth assembly for downward welding of pipelines
Single-side groove Angle()
Blunt edge thickness (mm)
Interface barrier (mm)
Maximum misalignment (mm)
Cellulose type
Allowable valuebzxz.net
30~~35
Recommended value
Allowable value
Recommended value
1,04,0
Not more than 3/1000 of the outer diameter of the pipe, not more than 27
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