This standard applies to the design, construction and maintenance of DC drainage projects for pipelines, and can be used as a reference for DC drainage protection of other buried metal structures. SY/T 0017-1996 Technical Standard for DC Drainage Protection of Buried Steel PipelinesSY/T0017-1996 Standard download decompression password: www.bzxz.net

Standard of DC drainage protection for buried steel pipelines
SY/ T 0017-96
Editor: Northeast Oil Transportation Administration Bureau of China National Petroleum Corporation Approving Department: China National Petroleum Corporation Petroleum Industry Press
1997 Beijing
2 Investigation and Measurement
2.1 Investigation and Measurement Items
2.2 Classification and Application of Measurement Operations.
Drainage Protection Facilities
4 Adjustment and Effect Evaluation of Drainage Protection
4.1 Adjustment of Drainage Protection
4.2 Evaluation of Drainage Protection Effect
5 Management of Drainage Protection System
Appendix A DC Interference Test Method for Buried Steel Pipeline A.1 General Provisions*
A.2 Pipeline Measurement Test
A.3 Test on the electric railway side
Explanation of words and phrases
Appendix Explanation of the provisions of the Technical Standard for DC Drainage Protection of Buried Steel Pipelines
·(26)
Document of China Shidi Oil and Gas Corporation
(96) CNPC Technical Supervision No. 561
Notice on the approval and release of five oil and gas industry standards including the "Technical Standard for DC Drainage Protection of Buried Steel Pipelines"
To all relevant units:
The five oil and gas industry standards (draft) including the "Technical Standard for DC Drainage Protection of Buried Steel Pipelines" have been reviewed and approved: they are now approved as oil and gas industry standards and are hereby released. The numbers and names of the various standards are as follows: Serial No. SY/T 0017-96 SY/T 0090-96 SY/T 041596 Technical Standard for DC Drainage Protection of Buried Steel Pipelines (Replacing SYJ17-86) Specification for Design of Instrument Control Systems for Oil and Gas Fields and Pipelines Technical Standard for Anticorrosion and Insulation Layer of Rigid Polyurethane Foam Plastics for Buried Steel Pipelines (Replacing SYJ8--86, SYJ4015--87, SYJ 4016--87) Technical Standard for Epoxy Coal Tar Anticorrosion Layer of Buried Steel Pipelines (Replacing SYJ 28--87, SYJ 4047
SY T 0546--1996
Collection and identification of corrosion products
The above standards have been implemented since June 1, 1997. China National Petroleum Corporation
November 15, 1996
"Technical Standard for DC Drainage Protection of Buried Boiler Pipelines" (SY11786) has been issued and implemented for 9 years. In the past 9 years, the protection technology has been greatly improved and its application has become more extensive. The original standard has been revised based on the original standard. The 1995 National Oil and Gas Industry Development Plan of the People's Republic of China was issued by China National Petroleum Corporation. This standard was revised by the original drafting unit, China National Petroleum Corporation Northeast Oil Transportation Administration.
This revision, combined with the characteristics of DC stray current interference and the technical particularity of discharge protection, puts forward the concept of "comprehensive management", "common protection" principle, and the importance of establishing a regional "joint defense organization" according to the principle of "four unifications" (unified testing, unified design, unified management, unified evaluation, and separate implementation). In the process of revision, we absorbed advanced foreign experience, solicited opinions from relevant parties, and finally the Planning and Design Institute of China National Petroleum Corporation organized relevant parties to jointly review the draft.
In view of the strong practicality of direct current discharge protection technology, we hope to pay attention to accumulating information and summarizing experience during the implementation of this standard. If you find that there are areas that need to be revised and supplemented, please provide us with opinions and relevant information for reference in future revisions. This revised version: the name of the standard is still "Technical Standard for Direct Current Drainage Protection of High-quality Pipelines", and the number is changed to SY Product T 0017-96 After the implementation of the revised version of this standard: the original standard "Technical Standard for Direct Current Drainage Protection of Ground Steel Pipelines" (SYJ17-86) will be abolished. Editor: Northeast Oil Transportation Administration Bureau of China National Petroleum Corporation Main author: Li Shaoshi Dun Jiuhong
Northeast Oil Transportation Administration Bureau
December 1995
1 General
101 This standard is formulated to control the corrosion of direct current micro-current on ground steel pipelines (hereinafter referred to as pipelines) and unify the technical requirements for direct current drainage protection. 1? This standard can be used as a reference for the direct current drainage protection of other ground metal structures during the design, construction and protection of direct current pipelines. 1.0.3 Pipelines near direct current electrified railways, cathodic protection systems and their pools: investigation and testing should be carried out on both the interference source side and the pipeline side. When the ground potential at any point of the pipeline deviates from the natural potential by 20mV or the soil potential gradient near the pipeline is greater than 0.5m, it is confirmed as DC interference. 1.0.4 When the ground potential at any point of the pipeline deviates from the natural potential by 100mV in the positive direction or the soil potential gradient near the pipeline is greater than 2.5mV/m, the pipeline should take DC drainage protection or other protective measures in time. 1.0.5 The negative offset of the ground potential caused by drainage measures is not specified in this standard, but it should be ensured that the negative offset of the ground potential does not exceed the electrode stripping potential of the anti-corrosion layer used in the pipeline.
1.0 Drainage protection is only the main or indispensable measure for DC dry batch sweetening. However, for occasions with severe interference or complex interference conditions, drainage protection should be taken as the main measure and other corresponding measures, including anti-corrosion layer maintenance, replacement, insulation connection, short-circuit connection (including metal connection with series adjustment resistor to help equalize voltage), shielding (including electric field shielding) and other "comprehensive management" measures. If necessary, measures should also be taken on the interference source side. These measures may not only reduce the interference level of the interfered party, but also help to increase the efficiency of energy flow protection.
1.0.7 The interference effect of the drainage protection system on its adjacent metal structures should be limited. Incorporating other pipeline systems or metal structures that are interfered with into the proposed protection system and implementing "common protection" is one of the best measures. When this option is difficult to implement, short-circuit connection (hook connection, including series adjustment resistor method) should be adopted to restore the ground potential of the interfered body to the level before the interference. 1.0.8 When the power cable and pipeline or communication cable are "commonly protected", special attention should be paid to the harmful effects caused by abnormal current and abnormal voltage when the power cable fails. The installation of a reactor or a tow line between the two is one of the measures to prevent its impact.
1.09 For the interference area, an interference prevention coordination organization composed of representatives of the disturbed party, the disturbing party and their related parties shall "jointly set up defenses, handle and coordinate interference prevention issues in accordance with the principles of unified testing, unified installation, unified management, unified evaluation and separate implementation.
1.0.10 The engineering design, construction and maintenance of DC current protection shall comply with the relevant provisions of current national laws and standards in addition to the implementation of this standard. 2 Investigation and measurement
2.1 Items of investigation and measurement
2.1.1 The following items shall be investigated and measured for DC electrified railways and other interference sources:
1 The location of DC power supply stations and other interference sources, and the status and distribution of the feeding network and return network.
Operation status of trams and other interference sources. ||t t||The potential of rails and other interference sources to the ground and their distribution. The leakage current trend and electrical gradient of rails and other interference sources. The examples of corrosion in the area where the pipeline is disturbed.
The relative position of the pipeline and the interference source: distribution. 3 Pipe-to-ground potential and its distribution (including the distribution of pipeline-to-ground potential according to pipeline mileage and the distribution of pipeline-to-ground potential changes over time).
The annual interference current (magnitude and direction) flowing in the pipe wall. The magnitude and location of the interference current flowing into and out of the pipeline. The voltage and direction (polarity) of the pipeline to the rail. The leakage resistance of the pipeline to the ground.
The soil resistivity along the pipeline.
The direction of stray current in the earth along the pipeline. The potential gradient. The operating parameters and operating status of the existing cathodic protection and drainage protection of the pipeline. The potential difference between the pipeline and other adjacent and intersecting pipelines and other buried metal structures and the operating parameters and operating status of its electrical protection (including drainage protection). 2.2 Classification and application of measurement work
Measurement work is divided into the following three types:
I Preliminary measurement: used to generally understand the degree of interference and the characteristics and distribution of pipe-ground potential, and provide a basis for drainage engineering measurement. 2 Drainage engineering measurement: used to provide technical parameters for the implementation of drainage engineering.
3 Drainage effect evaluation measurement: used to adjust the drainage protection operation parameters and evaluate the drainage effect.
2.2.2 The investigation and measurement items specified in Articles 2.1.1 and 2.1.2 can be determined according to the specific interference status and the type of measurement operation to determine whether all or part of the items are measured. In general, it is advisable to proceed according to the provisions of Table 2.2.2. Recommended investigation and measurement items table
Investigation and measurement items
Location of DC power supply station, status and distribution of feeding network and return network
Operation status of trams and other interference sources
Track and other interference sources to ground potential and their distributionTendency and potential gradient of leakage current of rails and other interference sources
Corrosion spots in the local area
Related location and distribution of pipelines and interference
Pipeline ground potential and its distribution (including distribution with distance or time)
Interference current flowing in the pipe wall (direction and magnitude)Magnitude and location of interference current flowing into and out of the pipeline
Preparatory
Table 2.2.2||tt| |Determination classification
Drainage work
Need degree
Drainage effect
Evaluation
Investigation and determination items
Voltage and direction (polarity) of pipeline to rail Leakage resistance of pipeline to ground
Resistivity of soil fill along pipeline
Direction and potential of stray current in the earth along pipeline
Operation parameters and status of polarity protection and drainage protection of pipeline
Potential difference between pipeline and other adjacent pipelines, branch pipelines and other underground metal structures and operation parameters and status of electrical protection (including drainage protection)
Note: The meaning of symbols in the table: - Items that must be carried out: A - Items that should be carried out:
, - Items that should be carried out.
The measuring points should be selected according to the following principles
Preparatory
Preparatory tide determination can make use of existing test points (point 1
Continued Table 2.2.2
Measurement classification
Drainage engineering
Measurement
Need degree
Drainage effect
Evaluation
2Drainage engineering measurement should be arranged on the pipe section with more serious interference according to the preliminary measurement results. The distance between measurement points should be 50-200m: it should not be greater than 500m3Drainage effect evaluation measurement should be selected from the drainage engineering measurement points. 2.2.4
Drainage engineering measurement and drainage effect evaluation measurement should comply with the following principles: The measurement work of each measurement point should start and end at the same time. 1
2Each measurement point records data at the same reading time interval. 3Interference source Synchronous measurement with the interfered object (pipeline) 2.2.5 The measurement time period is generally 40 to 60 minutes. For DC electrified railways with frequent operation, 30 minutes can be taken. The measurement time period should be selected in the period with representative load changes. Generally, it should be selected in the three time zones of the peak, sub-peak and general load of the interference source.
2.2.6 The reading time interval is generally 10 to 30 seconds. When the potential alternation is intense, it shall not be more than 10 seconds.
2.2.7 The proposed discharge point, actual discharge point, effect evaluation point and other representative points shall be measured continuously for 24 hours. 2.28 The soft numbers of all measurements should not be less than three times: the starting time, set time period, reading time interval and measurement point shall be the same each time. 2.2.9
Data processing shall be carried out in accordance with the provisions of Appendix A.
3 Drainage protection facilities
3.01 According to the analysis of the investigation and measurement results, select the appropriate drainage protection method. Table 3.0.1 illustrates the advantages, disadvantages and applicability of commonly used drainage protection methods. Drainage protection method
DC drainage
Drainage line
Polarity drain
Drainage device
Drainage line
1 The disturbed pipeline
The disturbed pipeline
There is a stable positive and negative anode tube ground potential
2. The DC power supply is connected
to the ground or negative return line,
1. Easy to install;
1. Simple and economical:
2. Good effect
Limited scope of application
2. Scope of application
3 No power supply
Forced energy construction
Pipeline rail power Potential difference is small
1. Large protection range;
Low-ground drainage
Railway engineering
grounding bed
Cannot be directly connected to the source of interference
1. Wide application range, can
2. Can be used for other drainage methods to adapt to various situations: 2. Special occasions with relatively large interference to other facilities;
, when the tram is out of service, it can be used for partial cathode protection to provide cathode protection for pipelines (when the protective
cathode grounding)
1. Aggravates the corrosion of rail electric distribution:
2. When the arm is far away from the rail, the effect is poor
and the influence on the distribution of rail electric distribution is relatively large;
3 Power supply is required
1. The effect is slightly poor:
2. Auxiliary grounding bed is required28 All the soft numbers measured should not be less than three times: the starting time, fixed time period, reading time interval and measuring point should be the same each time. 2.2.9
Data processing shall be carried out in accordance with the provisions of Appendix A.
3 Drainage protection facilities
3.01 Based on the analysis of the investigation and measurement results, select the appropriate drainage protection method. Table 3.0.1 shows the advantages, disadvantages and applicability of commonly used drainage protection methods. Drainage protection method
DC drainage
Drainage line
Polarity drain
Drainage device
Drainage line
1On the disturbed pipeline
On the disturbed pipelinebzxz.net
There is a stable positive and negative potential of the anode tube
2. The DC power supply is connected to the ground or negative return line,
1. Easy to install;
1. Simple and economical:
2. Good effect
Limited application scope
2. Application scope
3 No power supply
Forced energy construction
The potential difference of the pipe rail is small
1. Large protection range;
Low ground drainage
Track construction grounding bed cannot be directly connected to the interference source. 1. Wide application range, can be used in other ways to adapt to various situations: 2. Special occasions with relatively large interference to other facilities; 3. It can be used when the tram is out of service. 4. It can provide partial cathode protection for pipelines (when the cathode is grounded) 1. Aggravates the corrosion of rail electric field: 2. When the arm is far from the rail, the effect is poor and the distribution of rail electric field is affected; 3. Power supply is required. 1. The effect is slightly poor: 2. Auxiliary grounding bed is required28 All the soft numbers measured should not be less than three times: the starting time, fixed time period, reading time interval and measuring point should be the same each time. 2.2.9
Data processing shall be carried out in accordance with the provisions of Appendix A.
3 Drainage protection facilities
3.01 Based on the analysis of the investigation and measurement results, select the appropriate drainage protection method. Table 3.0.1 shows the advantages, disadvantages and applicability of commonly used drainage protection methods. Drainage protection method
DC drainage
Drainage line
Polarity drain
Drainage device
Drainage line
1On the disturbed pipeline
On the disturbed pipeline
There is a stable positive and negative potential of the anode tube
2. The DC power supply is connected to the ground or negative return line,
1. Easy to install;
1. Simple and economical:
2. Good effect
Limited application scope
2. Application scope
3 No power supply
Forced energy construction
The potential difference of the pipe rail is small
1. Large protection range;
Low ground drainage
Track construction grounding bed cannot be directly connected to the interference source. 1. Wide application range, can be used in other ways to adapt to various situations: 2. Special occasions with relatively large interference to other facilities; 3. It can be used when the tram is out of service. 4. It can provide partial cathode protection for pipelines (when the cathode is grounded) 1. Aggravates the corrosion of rail electric field: 2. When the arm is far from the rail, the effect is poor and the distribution of rail electric field is affected; 3. Power supply is required. 1. The effect is slightly poor: 2. Auxiliary grounding bed is required
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