This specification is applicable to the construction and acceptance of oil and gas pipeline crossing projects, and other pipeline crossing projects can refer to it. SY/T 4079-1995 Oil and gas pipeline crossing project construction and acceptance specification SY/T4079-1995 standard download decompression password: www.bzxz.net

Petroleum and gas pipeline crossing engineering construction and acceptance specificationSY7 T 407995Editor: China Petroleum and Gas Pipeline No. 1 Engineering CompanyApproval: China National Petroleum and Natural Gas CorporationPetroleum Industry Press1995 BeijingPipeline waterproofing, assembly welding, pressure testing and ball passingRiverbed trench excavationSurveying and laying outDiversion and interception trench excavationUnderwater excavation pipeBlasting trenchingGeometric dimensions and quality requirements for riverbed trenchPipeline traction in placeGeneral provisions: Pulling the pipe along the riverbed t||Floating pipe crossing the river
Pipe stabilization,
Backfilling and bank protection
Stabilization forms and construction requirements
Pipe trench backfilling and landform restoration
Air lift pipe crossing the river
Pipeline crossing roads and railways
General provisions
Project pipe construction
Drilling construction
Excavation construction
Directional drilling rig crossing
General provisions
Measurement and setting out
Drilling rig installation and commissioning
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8.4 Mud preparation
8.5 Pilot hole drilling and pipeline pullback
8.6 Pipeline crossing construction
9 Project acceptance
Appendix A
Appendix B
Appendix Cbzxz.net
Appendix D
Appendix E
Concept of blasting parameters
Selection and examples of blasting parameters
Geological drilling requirements
Mud viscosity table||tt| |Explanation of terms used in this specification
Additional explanation
Explanation of clauses of the Specification for Construction and Acceptance of Petroleum and Natural Gas Pipeline Crossing Projects
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Document of China National Petroleum Corporation
(95) CNPC Technical Supervision No. 156
Notice on the approval and release of eleven petroleum and natural gas industry standards, including the "Safety Regulations for Heating Furnaces for Petroleum Industry" To all relevant units:
The "Safety Regulations for Heating Furnaces for Petroleum Industry" and other eleven standards (draft) have been reviewed and approved and are now approved as petroleum and natural gas industry standards for release. The numbers and names of the standards are as follows:
SY 0031—95
SY7T 0086---95
SYT 407495
SYT 4075-95
SY/T 4076..95
SY/T 407795
Safety regulations for heating furnaces used in the petroleum industry (replacing SYJ 31-88)
Electrical insulation standards for cathodic protected pipelines
Machine coating process for cement mortar lining of steel pipelines
Centrifugal forming construction process for fly ash cement mortar lining of steel pipelines
Pneumatic shovel coating process for inner coating of liquid paint for steel pipelines
Pneumatic extrusion coating process for cement mortar lining of steel pipelines
SYT 4078-95
SY/T 4079--95
SY T 4080-95
SY 408195
SYT 4082--95
Liquid coating patching machine patching process for internal coating of steel pipelines
Specification for construction and acceptance of petroleum and natural gas pipeline crossing projects
Method for detection of leakage of pipelines and storage tanks
Technical standard for anti-identification of steel spherical storage tanks
Specification for construction and acceptance of gas field well site equipment and pipeline installation projects
The above standards shall be implemented from September 1, 1995. China National Petroleum Corporation
March 11, 1995
1.0.1 This specification is specially formulated to improve the construction technology level, speed up the progress of the project, ensure the quality of the project and improve the economic benefits. 1.0.2 This specification applies to the construction and acceptance of oil and gas pipeline crossing projects, and other pipeline crossing projects can refer to it for implementation. 1.0.3 In addition to implementing this specification, crossing projects should also comply with relevant national or industry standards in force.
1.04 The construction organization design or construction plan of the crossing project should be submitted to the department with jurisdiction over the rivers, railways, highways and other facilities to be crossed for approval before construction. 1.0.5 Used standards:
GBJ20183 Construction and Acceptance Specifications for Earthwork and Blasting Engineering SYJ400190
Construction and Acceptance Specifications for Long-distance Pipeline Line Engineering 2 Pipeline Anticorrosion, Assembly Welding, Pressure Testing and Ball Passing 2.0.1 The materials, structural grades and coating thickness used for anticorrosion of the crossing pipe section should comply with the design requirements, and the specific construction requirements should comply with the relevant provisions of the current industry anticorrosion standards.
2.0.2 The welding quality of the crossing pipe section should be strictly controlled, and its radiographic flaw detection ratio and qualified level should meet the design requirements. When there is no regulation in the design, the annular welds shall be 100% radiographically inspected, and their qualified level shall not be lower than the qualified level of the main line flaw detection. 2.0.3. After the annular welds of the crossing pipe section are qualified by flaw detection, a separate pressure test shall be carried out, and the strength pressure test time shall not be less than 4 hours, and the tightness pressure test time shall not be less than 8 hours. The pressure test method and specific requirements shall comply with the relevant provisions of Chapter 10 of SYJ4001-90. When the crossing pipe section is connected to the entire line, another tightness test shall be carried out. 2.0.4 The materials and pipelines used in the crossing project, anti-corrosion, assembly welding: pressure test and ball passing shall comply with the provisions of SYJ4001-90 in addition to the provisions of Articles 2.0.1, 2.0.2, and 2.0.3 of this chapter.
Riverbed trench excavation
3.1 Measurement and layout
3.1.1 According to the design of the construction drawings: relative coordinate points and relative elevations, measure the center line of the trench, the elevation of the bottom of the trench and the width of the trench. The center line of the trench, the elevation of the bottom of the trench and the width of the trench should meet the design requirements.
3.1.2: The location and geometric dimensions of the diversion ditch, "intercepting dam, delivery channel and towway should be determined according to the construction plan, and the plane layout of the construction site should be carried out. 3.2 Diversion and interception trench excavation
3.2.1 First use the national weir method to divert or intercept, and then use mechanical or manual methods to excavate the trench inside the weir. Pipeline assembly welding, anti-corrosion patching, pressure testing, ball passing, trenching, backfilling and other operations should be carried out inside the weir.
3.2.2 Diversion and cofferdam should Meet the following requirements 3.2.2.1 The bottom of the diversion ditch must be lower than the river surface at the inlet, and the bottom of the ditch should have a certain slope along the direction of water flow. The width of the diversion ditch should be determined according to the size of the river flow.
3.2.2.2 The distance between the two sections of the dam upstream and downstream of the river should be able to meet the construction requirements. The top of the dam should be 1 to 1.5 meters above the river surface and not exceed the lowest point of the river bank; the cross-section of the dam should be trapezoidal, and its slope ratio should be 1:1 to 1:2. The width of the dam top should be determined according to the depth of the river water, Generally, it is 2~～5m. 3.2.3 Use the cofferdam method to excavate the trench: effective dewatering methods should be adopted according to the soil properties, construction methods and construction machinery of the crossing section: to ensure the normal progress of trench excavation and other operations. When the excavation section is gravel sand, sand stone, sandy soil, and clay, open ditch dewatering can be used; if it is silt, quicksand, silt sand and fine sand, well point dewatering can be used.
3.3 Underwater trench excavation
3.3.1 For rivers with soft riverbed soil, low water flow rate and small siltation volume, it is advisable to use a suction dredger or a suction dredger to excavate the trench. The riverbed soil is hard, such as hard Soil layer or pebble layer, grab dredger or wheel bucket dredger can be used to dig trench: 3.3.2 The riverbed geology is sand, clay or pebble soil, and dragline can be used in combination with other methods to dig trench.
3.4 ​​Blasting trench
3.4.1 According to the riverbed hydrology, geological conditions and technical requirements of the crossing project, the corresponding blasting construction method should be selected: such as pile blasting method, buried blasting method and exposed blasting method.
3.4.2 Calculation formula for soil and rock blasting explosives: When the minimum resistance line is h3m, it should be calculated according to formula (3.4.2-1).
Q= Abh3
g—group charge (intermediate explosive), kg; A—individual material (soil and rock) resistance coefficient, refer to Table 3.4.2-2b; coefficient of blasting action index, refer to Table 3.4.2-1; h
—minimum resistance line, ml.
.(3.4.2.-1)
When the minimum resistance line h>3m, calculate according to formula (3.4.2-2). 2= Kh3(0.4+ 0.6m3)
In the formula, K-
(3.4.2- 2)
For the amount of explosives required for blasting every cubic meter of soil and stone, refer to Table 3.4.2-3; the blasting effect index is usually taken as 1.0~1.5; h-minimum resistance line: m (equal to the penetration depth) 3.4.3
When using the blasting method for construction, the following provisions should be followed: 3.4.3.1
According to the design requirements of the crossing project, determine the diameter of the steel pipe charge pile. The specifications of the steel pipe charge are usually medium 273×3, Φ377×7. 7=
4t'1=d
4s'[=1
4S21=4
Name of soil and stone
Land with sand and gravel
Soil for growing plants
Sandy land
Sandy clay and hard surface clay
Rocky soil
Red clay Soil
Limestone
Granite
Determination of new accumulation zone
:
Medium (soil and rock) resistance coefficient
Table 3.4.2-2
1. When using low-grade explosives, the coefficient A value is the same as that of medium-grade explosives. If low-grade explosives are used to blast hard rocks, the amount of explosives should be increased by 0.2~0.5 times compared with the calculated amount
2. If it is frozen soil, the coefficient should be increased by 0.5 times
3. If it is stratified soil, the A value should be taken from the value of the hardest layer4. If there are cracks in hard rocks, the coefficient value should be reduced by 1/25. When conditions permit, it is best to verify the coefficient A with a standard charge test
Pile length (L), pile depth in the soil () and blasting depth (p)L=H+Hr+d
d=p- P below
p F+ S
length of the pile, im;
water depth, m;
length of the pile above the water surface, m:
ddepth of the pile in the soil, m,
depth of the trench formed by blasting (visible depth), m:P below
depth of the blasting bottom, (take 0.305
pipeline design depth, n1;
depth of silting: m (generally take 1~2).
(3.4.3 -- 1)
(3.4.3— 2)
(3.4.3 - 3)
Soil and rock name
Compacted sand or wet sand
Sand clay
Firm clay
Sub-clay (loess)
Chalk
Hard stone, marl, opal
Fissure extrusive rock, heavy pumice
Shell limestone
Gravel and calcareous gravel
Sandstone, stratigraphic sandstone, marl
Calcium sandstone, dolomite,
Sandstone, limestone
Granite
Basalt. Mountain rock
Quartzite
Soil and rock grade
12- 16
K(kg/m\)
1.2～1.35
1.8 ~ 2.1
1.35~1.65
1.35~ 1.65
1.5-- 2.4
1.8 2.25
Table 3.4.2-3
1. The K values ​​listed in the table are all based on ammonium nitrate
explosives. If necessary, standard explosives can be used (K-2 test explosion correction
but should not be less than (pile length
The explosive quantity of a single pile is calculated according to formula 3.4.3-4 Q= Ab(H0.3 + /07)2.2
Quantity of explosives for a single charge pile, kg;
Price-quality resistance coefficient, take 0.9
5——Coefficient of blasting action index, take 14.9.3.4.3.4
(3.4.3 4)
Manufacturing of steel pipe charge piles: the steel pipe should be processed into a steel pipe pile with a cone at one end and a mouth at the other end.
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