SY/T 0450-1997 Specification for seismic design of buried steel pipelines for oil (gas) transportation
Some standard content:
Petroleum and Natural Gas Industry Standard of the People's Republic of China Seismic design code of oil and gas buried steel pipeline SY/T 045097
Editor: China National Petroleum Corporation Anti-deposition Office Approval Department: China National Petroleum Corporation Petroleum Industry Press
1998 Beijing
Basic Provisions
Site and Engineering Geological Survey
Seismic Geological Survey and Disaster Assessment
Calculation of Buried Pipelines
General Requirements
Strain Combinations and Allowable Values
Calculation of Pipeline Strain Caused by Ground Capsule Waves
Calculation of Buried Pipelines Passing Through Active Fault Zones Earthquake-Resistant Measures
General Requirements
Measures to Improve Pipeline Anti-destruction Capacity
Anti-destructive Measures for Active Fault Zones
Anti-destructive Measures for Landslide Areas
Anti-destructive Measures for Sand Liquefaction Areas
Appendix A
Appendix B
Division of Pipeline Sites||tt| |++++++++
Material properties and allowable tensile strain
Appendix C Stability verification of landslide areas
Explanation of standard words and phrases·
Explanation of seismic design specifications for buried steel pipelines for oil (gas) transportation
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(17)
(24)
(29))
Document of China National Petroleum Corporation
[97] CNPC Technical Supervision No. 698
Notice on the approval and release of 35 oil and gas industry standards including "Technical Standard for Fusion Bonded Epoxy Powder Coating of Steel Pipelines"
To all relevant units: 35 oil and gas industry standards including "Technical Standard for Fusion Bonded Epoxy Powder Coating of Steel Pipelines" (draft) have been reviewed and approved and are now approved as oil and gas industry standards for release.
The numbers of various industry standards are as follows: No.
SY / T 031597
SY / T 0316-97
SY /T 031797
SY T 0407--97
Technical standard for external coating of fusion-bonded epoxy powder for steel pipelines
Recommended practice for on-site inspection of new pipelines
Building code for saline soil areas
Specification for surface preparation of steel materials before painting
(Replaces SYI4007-86)
SY7T 0419-97
SY/T 0420-97
SY 0422-97
SY / T 044297
SY / T 044897
SY / T 0449--97
SY / T 045097
SY 0466--97
SY /T 05151997
SYT 5020-1997
SY/T 5212--1997
Specification for the manufacture, installation and acceptance of water jacket heating furnaces for oil fields (replacing SYJ4019-
Technical standard for asphalt anticorrosion layer of buried steel pipelines (replacing SYJ4020-88
SYJ 8-84)
Specification for the construction and acceptance of oil field gathering and transportation pipelines
Replacing SYJ 4022-88.SYJ 4009
-86.SY 4061-93)
Technical standard for internal coating of fused epoxy powder for steel pipelines (replacing SYJ4042-89)
Construction and acceptance specification for steel pressure vessels for oil and gas processing in oil fields (replacing SYJ4048
Construction and acceptance specification for steel atmospheric pressure vessels for oil and gas fields (replacing SYJ4049-91)
Seismic design specification for buried steel pipelines for oil (gas) (replacing SYJ4050-91)
Construction and acceptance specification for natural gas gathering and transportation pipelines (replacing SY 4066-93, SY T
408295
Oil and gas separator specification (replacing SY7515
Tapered cylindrical thread for drilling pumps (replacing
SY 502080. SY 5021-80 | | tt | 5599—1997
SY/T 5675-
SY/T 5788.21997
SY/T 6187—1997
SY /T 6285
SY/T 62861997
SY /T 62871997
SY/T 6288-1997
SY / T 62891997
SY /T 62901997
SY /T 6291--1997
SYT 62921997
SY /T 62931997
SY / T 6294-1997
Technical specification for onshore two-dimensional seismic exploration data processing (replaces SY5332--92)
Technical specification for onshore three-dimensional seismic exploration data acquisition (replaces SY5455-92)
Oilfield chains and sprockets (replaces SY/ T 559593)
Specification for the preparation of geological maps for oil and gas exploration well completion (replaces SY5599-93)
Specification for the preparation of geological summary reports for oil and gas exploration well completion (replaces SY/T 5675-
Specification for gas logging for oil and gas exploration wells (replaces SY/T 5788.2-93)
190 series diesel engine for oil drilling rig
Use and scrap conditions
Evaluation method of oil and gas reservoir
Detailed description method of carbonate reservoir
Determination method of oil well production index
Selection method of drill pipe and drill chain
Technical specification for continuous electromagnetic surface exploration
Auxiliary data format for onshore three-dimensional geophysical exploration
Technical specification for dynamic measurement of global satellite positioning system for petroleum geophysical exploration
Interpretation and quality of test data for oil well test
Specification for oil test work
Field sampling specification for oil and gas exploration well analysis samples
SY/T 6295—-1997
SY/T 75071997
SY/T 7508—1997
Reliability prediction method for oil drilling equipment
Determination of water content in natural gas by electrolytic method
(Replacement of SY7507—87)
Determination of total sulfur in petroleum gas in oil and gas fields by oxidation microcoulometry (Replacement of SY750887)
The above standard shall be implemented on June 1, 1998. China National Petroleum Corporation
December 28, 1997
This standard is edited by the Earthquake Resistance Office of China National Petroleum Corporation in accordance with the spirit of Document No. 52 of (96) Zhongyoujilanzi. During the preparation of this standard, the members of the preparation team summarized the engineering practice of seismic resistance of buried pipelines at home and abroad, and proposed a simplified calculation method and comprehensive seismic resistance measures applicable to pipeline seismic resistance by using the deformation control theory commonly used internationally. Finally, the Petroleum Engineering Construction Professional Standardization Committee reviewed and finalized it in conjunction with relevant departments. The main contents of this standard include: general principles, terminology, basic regulations, site and engineering geological survey, earthquake geological survey and disaster assessment, buried pipeline calculation and seismic measures, etc. It is based on the geometric characteristics, stress characteristics and deformation characteristics of buried pipelines, and applies deformation control theory to carry out seismic design of buried pipelines, making full use of the ductility of steel and reducing the seismic fortification cost of buried pipelines; this standard divides important sections and general sections according to the characteristics of pipeline sites, and strengthens the survey of key sections. The entire standard structure is complete and reasonable, the seismic measures are feasible, the calculation formula is simple and reasonable, the operability is strong, the technology is advanced, and it has reached the leading level in China. In some aspects, it has reached the same level as similar international advanced standards.
This standard is interpreted by the Seismic Office of China National Petroleum Corporation. Main editor: Seismic Office of China National Petroleum Corporation Co-editor: China Petroleum and Natural Gas Pipeline Survey and Design Institute, China Petroleum and Natural Gas Sichuan Design Institute, Institute of Engineering Mechanics of the State Seismological Bureau. Main drafters Chen Xiangqiu, Zhang Shenyuan, Feng Qimin, Wang Youlong, He Lijuan, Zhang Weiquan, Cai Xiaoyue, Zhu Amei
1.0.1 In order to implement the principle of "prevention first" in seismic work, in order to avoid or reduce the damage to buried steel pipelines for oil (gas) transportation and prevent the occurrence of earthquake disasters, and to facilitate emergency repair and rapid restoration of use, this specification is formulated. 1.0.2 This specification is applicable to the seismic design of buried steel pipelines for oil (gas) transportation with a seismic fortification intensity of .7 to 9 degrees. For pipelines with a fortification intensity higher than 9 degrees or with special seismic requirements, special research should be conducted.
1.0.3 The seismic fortification of buried oil (gas) pipelines shall adopt the basic intensity as the fortification intensity. The basic intensity shall be determined according to the current China's ground waist intensity zoning map issued by the state. "For areas that have been zoned into small areas, seismic fortification can be considered according to the batch of seismic motion parameters. Strengthening measures should be taken in the structure of important sections. 1.0.4 Special research should be conducted on large pipelines that pass through areas with geological disaster backgrounds, and specific measures should be proposed. 1.0.5 In addition to complying with this code, the seismic design of buried steel pipelines for oil (gas) transportation shall also comply with the provisions of the current national mandatory standards and specifications. 2.0.1 Field
2 Terms
The site refers to an area 200m wide on each side centered on the pipeline axis. 2.0.2 Active fault active faults
Faults that were active or are currently active during the Holocene geological period. 2.0.3 Important section for gas pipeline According to the provisions of GB50251 "Code for Design of Gas Pipeline Engineering", the section of the gas pipeline through the fourth-level area. 2.0.4 Important section for oil pipeline According to the provisions of GB50253 "Code for Design of Oil Pipeline Engineering", the section of the oil pipeline within the shut-off valves at both ends of the pipeline installed in the large rivers, lakes, reservoirs and population centers passed by.
2.0.5 General section General section The pipeline section other than the important section.
2.0.6 Shear wave velocity Shear wave propagation speed.
2.0.7 Transition section of active fault Faults Fault movement will cause the axial displacement of the pipeline: the axial displacement of the pipeline is gradually absorbed by the friction between the soil and the pipeline from the maximum displacement of the fault. After a certain distance away from the fault, the axial displacement is reduced to zero. This point is called the anchor point. The pipe section between the anchor points on both sides of the fault is called the fault transition section.
3 Basic regulations
3.0.1. The seismic design of buried steel pipelines for oil (gas) transportation shall meet the following requirements: 1. The seismic design shall be technologically advanced, safe and reliable, and economically reasonable: 2. Select a site and foundation that is favorable for seismic development. The division of seismic sites shall comply with the provisions of Appendix A of this code; for unavoidable bad sections, effective seismic measures shall be taken. Covering measures:
3 Effective measures should be taken to prevent and reduce the occurrence of earthquake disasters. 3.0.2 For sections that have not been divided into seismic zones, the boundary of seismic intensity should be reviewed at the boundary of different seismic areas.
3.0.3 When the pipeline passes through areas with a fortification intensity of 7 degrees or above, in addition to engineering geological surveys, seismic geological surveys should also be conducted to evaluate whether there are any adverse seismic geological phenomena on the site.
3.0.4 After a comprehensive analysis and comparison based on the importance of the pipeline project, fortification intensity, site soil type, engineering geological conditions, and the impact of earthquake disasters, reasonable and effective anti-seismic measures should be proposed.
4 Site and engineering geological survey
4.0.1 The site selection of the pipeline project should be based on a comprehensive evaluation of the seismic activity, seismic geological surveys, engineering geological surveys, ground cover danger, seismic geological disaster evaluation, site conditions, etc., to select sections that are favorable to the pipeline project and avoid dangerous sections for construction.
4.0.2 The sections along the pipeline are divided into general sections and important sections according to their importance, and the site division, engineering geological survey, geogeological survey and disaster assessment are carried out according to different requirements.
Pipeline site soil can be divided into hard site soil, medium site soil and soft site. 4.0.3
4.0.4 For important sites in general sections, the existing engineering geological data and field survey or drilling methods can be used to classify the site soil. 4.0.5 The characteristic parameters of the site soil can be taken according to Table 4.0.5 Table 4.0.5
Site soil characteristic parameters
Site type
Shear wave velocity (m/s)
Characteristic period (s)
Values.
Hard site soil
Medium site soil
500140
Soft site soil
≤140
The ground horizontal velocity of pipeline site soil under different fortification intensities shall be in accordance with Table 4.0.6 Table 4.0.6 Ground horizontal velocity values of pipeline site soil under non-fortification intensity Fortification intensity (degrees)
Ground horizontal velocity (m/s)
4.0.7 The classification of site soil in important sections shall comply with the provisions of the current national standard "Code for Seismic Design of Buildings" GBJ1I. Classification of site soil in important sections In the preliminary survey stage, the existing engineering geological data and field survey or drilling methods can be used to classify the site soil: In the detailed survey stage, each section should have representative boreholes, the number of boreholes should be no less than 3, the borehole depth should reach 15m or to the top surface of the hard soil layer, and the shear wave velocity and characteristic period should be given.1. This specification is formulated to implement the principle of "prevention first" in seismic work, to avoid or reduce the damage to buried steel pipelines for oil (gas) transportation and to prevent the occurrence of disasters when encountering earthquakes, and to facilitate emergency repairs and rapid restoration of use. 1.0.2 This specification is applicable to the seismic design of buried steel pipelines for oil (gas) transportation with a seismic fortification intensity of 0.7 to 9 degrees. For pipelines with a fortification intensity higher than 9 degrees or with special seismic requirements, special research should be conducted.
1.0.3 The seismic fortification of buried oil (gas) pipelines shall adopt the basic intensity as the fortification intensity. The basic intensity shall be determined according to the current China's ground waist intensity zoning map issued by the state. "For areas that have been zoned into small areas, seismic fortification can be considered according to the batch of seismic motion parameters. Strengthening measures should be taken in the structure of important sections. 1.0.4 Special research should be conducted on large pipelines that pass through areas with geological disaster backgrounds, and specific measures should be proposed. 1.0.5 In addition to complying with this code, the seismic design of buried steel pipelines for oil (gas) transportation shall also comply with the provisions of the current national mandatory standards and specifications. 2.0.1 Field
2 Terms
The site refers to an area 200m wide on each side centered on the pipeline axis. 2.0.2 Active fault active faults
Faults that were active or are currently active during the Holocene geological period. 2.0.3 Important section for gas pipeline According to the provisions of GB50251 "Code for Design of Gas Pipeline Engineering", the section of the gas pipeline through the fourth-level area. 2.0.4 Important section for oil pipeline According to the provisions of GB50253 "Code for Design of Oil Pipeline Engineering", the section of the oil pipeline within the shut-off valves at both ends of the pipeline installed in the large rivers, lakes, reservoirs and population centers passed by.
2.0.5 General section General section The pipeline section other than the important section.
2.0.6 Shear wave velocity Shear wave propagation speed.
2.0.7 Transition section of active fault Faults Fault movement will cause the axial displacement of the pipeline: the axial displacement of the pipeline is gradually absorbed by the friction between the soil and the pipeline from the maximum displacement of the fault. After a certain distance away from the fault, the axial displacement is reduced to zero. This point is called the anchor point. The pipe section between the anchor points on both sides of the fault is called the fault transition section.
3 Basic regulations
3.0.1. The seismic design of buried steel pipelines for oil (gas) transportation shall meet the following requirements: 1. The seismic design shall be technologically advanced, safe and reliable, and economically reasonable: 2. Select a site and foundation that is favorable for seismic development. The division of seismic sites shall comply with the provisions of Appendix A of this code; for unavoidable bad sections, effective seismic measures shall be taken. Covering measures:
3 Effective measures should be taken to prevent and reduce the occurrence of earthquake disasters. 3.0.2 For sections that have not been divided into seismic zones, the boundary of seismic intensity should be reviewed at the boundary of different seismic areas.
3.0.3 When the pipeline passes through areas with a fortification intensity of 7 degrees or above, in addition to engineering geological surveys, seismic geological surveys should also be conducted to evaluate whether there are any adverse seismic geological phenomena on the site.
3.0.4 After a comprehensive analysis and comparison based on the importance of the pipeline project, fortification intensity, site soil type, engineering geological conditions, and the impact of earthquake disasters, reasonable and effective anti-seismic measures should be proposed.
4 Site and engineering geological survey
4.0.1 The site selection of the pipeline project should be based on a comprehensive evaluation of the seismic activity, seismic geological surveys, engineering geological surveys, ground cover danger, seismic geological disaster evaluation, site conditions, etc., to select sections that are favorable to the pipeline project and avoid dangerous sections for construction.
4.0.2 The sections along the pipeline are divided into general sections and important sections according to their importance, and the site division, engineering geological survey, geogeological survey and disaster assessment are carried out according to different requirements.
Pipeline site soil can be divided into hard site soil, medium site soil and soft site. 4.0.3
4.0.4 For important sites in general sections, the existing engineering geological data and field survey or drilling methods can be used to classify the site soil. 4.0.5 The characteristic parameters of the site soil can be taken according to Table 4.0.5 Table 4.0.5
Site soil characteristic parameters
Site type
Shear wave velocity (m/s)
Characteristic period (s)
Values.
Hard site soil
Medium site soil
500140
Soft site soil
≤140
The ground horizontal velocity of pipeline site soil under different fortification intensities shall be in accordance with Table 4.0.6 Table 4.0.6 Ground horizontal velocity values of pipeline site soil under non-fortification intensity Fortification intensity (degrees)
Ground horizontal velocity (m/s)
4.0.7 The classification of site soil in important sections shall comply with the provisions of the current national standard "Code for Seismic Design of Buildings" GBJ1I. Classification of site soil in important sections In the preliminary survey stage, the existing engineering geological data and field survey or drilling methods can be used to classify the site soil: In the detailed survey stage, each section should have representative boreholes, the number of boreholes should be no less than 3, the borehole depth should reach 15m or to the top surface of the hard soil layer, and the shear wave velocity and characteristic period should be given.1. This specification is formulated to implement the principle of "prevention first" in seismic work, to avoid or reduce the damage to buried steel pipelines for oil (gas) transportation and to prevent the occurrence of disasters when encountering earthquakes, and to facilitate emergency repairs and rapid restoration of use. 1.0.2 This specification is applicable to the seismic design of buried steel pipelines for oil (gas) transportation with a seismic fortification intensity of 0.7 to 9 degrees. For pipelines with a fortification intensity higher than 9 degrees or with special seismic requirements, special research should be conducted.
1.0.3 The seismic fortification of buried oil (gas) pipelines shall adopt the basic intensity as the fortification intensity. The basic intensity shall be determined according to the current China's ground waist intensity zoning map issued by the state. "For areas that have been zoned into small areas, seismic fortification can be considered according to the batch of seismic motion parameters. Strengthening measures should be taken in the structure of important sections. 1.0.4 Special research should be conducted on large pipelines that pass through areas with geological disaster backgrounds, and specific measures should be proposed. 1.0.5 In addition to complying with this code, the seismic design of buried steel pipelines for oil (gas) transportation shall also comply with the provisions of the current national mandatory standards and specifications. 2.0.1 Field
2 Terms
The site refers to an area 200m wide on each side centered on the pipeline axis. 2.0.2 Active fault active faults
Faults that were active or are currently active during the Holocene geological period. 2.0.3 Important section for gas pipeline According to the provisions of GB50251 "Code for Design of Gas Pipeline Engineering", the section of the gas pipeline through the fourth-level area. 2.0.4 Important section for oil pipeline According to the provisions of GB50253 "Code for Design of Oil Pipeline Engineering", the section of the oil pipeline within the shut-off valves at both ends of the pipeline installed in the large rivers, lakes, reservoirs and population centers passed by.
2.0.5 General section General section The pipeline section other than the important section.
2.0.6 Shear wave velocity Shear wave propagation speed.
2.0.7 Transition section of active fault Faults Fault movement will cause the axial displacement of the pipeline: the axial displacement of the pipeline is gradually absorbed by the friction between the soil and the pipeline from the maximum displacement of the fault. After a certain distance away from the fault, the axial displacement is reduced to zero. This point is called the anchor point. The pipe section between the anchor points on both sides of the fault is called the fault transition section.
3 Basic regulations
3.0.1. The seismic design of buried steel pipelines for oil (gas) transportation shall meet the following requirements: 1. The seismic design shall be technologically advanced, safe and reliable, and economically reasonable: 2. Select a site and foundation that is favorable for seismic development. The division of seismic sites shall comply with the provisions of Appendix A of this code; for unavoidable bad sections, effective seismic measures shall be taken. Covering measures:
3 Effective measures should be taken to prevent and reduce the occurrence of earthquake disasters. 3.0.2 For sections that have not been divided into seismic zones, the boundary of seismic intensity should be reviewed at the boundary of different seismic areas.
3.0.3 When the pipeline passes through areas with a fortification intensity of 7 degrees or above, in addition to engineering geological surveys, seismic geological surveys should also be conducted to evaluate whether there are any adverse seismic geological phenomena on the site.
3.0.4 After a comprehensive analysis and comparison based on the importance of the pipeline project, fortification intensity, site soil type, engineering geological conditions, and the impact of earthquake disasters, reasonable and effective anti-seismic measures should be proposed.
4 Site and engineering geological survey
4.0.1 The site selection of the pipeline project should be based on a comprehensive evaluation of the seismic activity, seismic geological surveys, engineering geological surveys, ground cover danger, seismic geological disaster evaluation, site conditions, etc., to select sections that are favorable to the pipeline project and avoid dangerous sections for construction.
4.0.2 The sections along the pipeline are divided into general sections and important sections according to their importance, and the site division, engineering geological survey, geogeological survey and disaster assessment are carried out according to different requirements.
Pipeline site soil can be divided into hard site soil, medium site soil and soft site. 4.0.3
4.0.4 For important sites in general sections, the existing engineering geological data and field survey or drilling methods can be used to classify the site soil. 4.0.5 The characteristic parameters of the site soil can be taken according to Table 4.0.5 Table 4.0.5
Site soil characteristic parameters
Site type
Shear wave velocity (m/s)
Characteristic period (s)
Values.
Hard site soil
Medium site soil
500140
Soft site soil
≤140
The ground horizontal velocity of pipeline site soil under different fortification intensities shall be in accordance with Table 4.0.6 Table 4.0.6 Ground horizontal velocity values of pipeline site soil under non-fortification intensity Fortification intensity (degrees)
Ground horizontal velocity (m/s)
4.0.7 The classification of site soil in important sections shall comply with the provisions of the current national standard "Code for Seismic Design of Buildings" GBJ1I. Classification of site soil in important sections In the preliminary survey stage, the existing engineering geological data and field survey or drilling methods can be used to classify the site soil: In the detailed survey stage, each section should have representative boreholes, the number of boreholes should be no less than 3, the borehole depth should reach 15m or to the top surface of the hard soil layer, and the shear wave velocity and characteristic period should be given.4 After a comprehensive analysis and comparison based on the importance of the pipeline project, the fortification intensity, the soil type of the site, the engineering geological conditions and the impact of earthquake disasters, reasonable and effective anti-swelling measures should be proposed.
4 Site and engineering geological survey
4.0.1 The site selection of the pipeline project should be based on the comprehensive evaluation of the ground remote activity, earthquake geological survey, engineering geological survey, ground cover danger, earthquake geological disaster evaluation, site conditions, etc., to select the sections that are favorable to the pipeline project and avoid dangerous sections for construction.
4.0.2 The sections along the pipeline are divided into general sections and important sections according to their importance, and the site division, engineering geological survey, and geological survey and disaster evaluation are carried out according to different requirements.
Pipeline site soil can be divided into hard site soil, medium site soil and soft site soil. 4.0.3
4.0.4For important sites in general sections, the site soil classification can be carried out using existing engineering geological data and field survey or drilling methods. 4.0.5 The characteristic parameters of site soil can be taken according to Table 4.0.5 Table 4.0.5
Characteristic parameters of site soil
Site type
Shear wave velocity (m/s)
Characteristic period (s)
Values.
Hard site soil
Medium site soil
500140
Soft site soil
≤140
The ground horizontal velocity of pipeline site soil under different fortification intensities shall be in accordance with Table 4.0.6 Table 4.0.6 Ground horizontal velocity values of pipeline site soil under non-fortification intensity Fortification intensity (degrees)
Ground horizontal velocity (m/s)
4.0.7 The classification of site soil in important sections shall comply with the provisions of the current national standard "Code for Seismic Design of Buildings" GBJ1I. Classification of site soil in important sections In the preliminary survey stage, the existing engineering geological data and field survey or drilling methods can be used to classify the site soil: In the detailed survey stage, each section should have representative boreholes, the number of boreholes should be no less than 3, the borehole depth should reach 15m or to the top surface of the hard soil layer, and the shear wave velocity and characteristic period should be given.4 After a comprehensive analysis and comparison based on the importance of the pipeline project, the fortification intensity, the soil type of the site, the engineering geological conditions and the impact of earthquake disasters, reasonable and effective anti-swelling measures should be proposed.
4 Site and engineering geological survey
4.0.1 The site selection of the pipeline project should be based on the comprehensive evaluation of the ground remote activity, earthquake geological survey, engineering geological survey, ground cover danger, earthquake geological disaster evaluation, site conditions, etc., to select the sections that are favorable to the pipeline project and avoid dangerous sections for construction.
4.0.2 The sections along the pipeline are divided into general sections and important sections according to their importance, and the site division, engineering geological survey, and geological survey and disaster evaluation are carried out according to different requirements.
Pipeline site soil can be divided into hard site soil, medium site soil and soft site soil. 4.0.3
4.0.4For important sites in general sections, the site soil classification can be carried out using existing engineering geological data and field survey or drilling methods. 4.0.5 The characteristic parameters of site soil can be taken according to Table 4.0.5 Table 4.0.5
Characteristic parameters of site soil
Site type
Shear wave velocity (m/s)
Characteristic period (s)
Values.
Hard site soilbZxz.net
Medium site soil
500140
Soft site soil
≤140
The ground horizontal velocity of pipeline site soil under different fortification intensities shall be in accordance with Table 4.0.6 Table 4.0.6 Ground horizontal velocity values of pipeline site soil under non-fortification intensity Fortification intensity (degrees)
Ground horizontal velocity (m/s)
4.0.7 The classification of site soil in important sections shall comply with the provisions of the current national standard "Code for Seismic Design of Buildings" GBJ1I. Classification of site soil in important sections In the preliminary survey stage, the existing engineering geological data and field survey or drilling methods can be used to classify the site soil: In the detailed survey stage, each section should have representative boreholes, the number of boreholes should be no less than 3, the borehole depth should reach 15m or to the top surface of the hard soil layer, and the shear wave velocity and characteristic period should be given.
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