SY/T 0087-1995 Standard for investigation methods of corrosion and protection of steel pipelines and storage tanks
Some standard content:
Standard inestigation method for corrosion ad protection of steel pipelines and storage tanks pelinesandtanksSY/T0087-95
Editing unit: Northeast Oil Pipeline Administration Bureau, Planning and Design Institute of China National Petroleum Corporation
Petroleum University
Exploration and Design Institute of North China Petroleum Administration BureauApproving department: China National Petroleum Corporation, Petroleum Industry Press
1995Beijing
China National Petroleum Corporation document
(95) Zhongyou Jijian No. 731
Notice on the approval and release of 26 oil and gas industry standards including "Standard for Investigation Methods of Corrosion and Protection of Steel Pipelines and Storage Tanks"
Related units:
26 oil and gas industry standards including "Standard for Investigation Methods of Corrosion and Protection of Steel Pipelines and Storage Tanks" (Cao Shi) have been approved as oil and gas industry standards after market inspection and are released. The numbers and names of the standards are as follows: 1SY/T0087-95 Standard for investigation and delivery of corrosion and fracture protection for steel pipelines and storage tanks
SY/T0545-1995 Determination of thermal characteristic parameters of crude oil decomposition by differential scanning calorimetry
SY/T4013-95
SY/T4041-95
#SY/T4084-95
GSY/T4085-95
Technical standard for polyethylene anticorrosion layer for buried steel pipes (recommended by SY1403-87)
Installation and acceptance specification for special wet steam generator for oil fields (recommended by SYI4041-89)
Environmental conditions and load technology in Tianjin and Haikou Specification
Huaihai Oilfield Oil and Gas Marketing Technology Model
SY/T4086-93
SY/T4087-95
SY/T408S-95
SY/T4089-95
SY/T4090-95
SY7T4091-93
SY/T4092-95
SY/T4093-95
13SY/T4094-95
16SY/T4095-95
17SY/T409693
18SY/14097-95
19 SY/T4098-95
20SY/T 409-95
ISY/T4100-95
SY/T4101-95
SY/T4102-95
SY/T4103-1995
25SY4104-96
26SY/T 0088-95
Technical specification for design and construction of offshore structures
Technical specification for ventilation and air conditioning of Huaihai oil project Technical specification for water supply and drainage of Guanhai oil project Electrical specification of Yanghai oil project
Technical specification for power generation facilities of Weihai oil project Technical specification for corrosion protection of Guanhai oil project
Technical specification for moisture retention of Haihai oil project
Technical specification for selection and installation of cranes on beach oil facilities
Technical specification for structural design and construction of shallow-water steel fixed platforms
Technical specification for structural design and construction of mobile platforms
Technical specification for wellhead protection devices of Guanhai oilfield Technical specification for design and construction of artificial island structure
Technical specification for design and construction of steel formwork-concrete artificial island structure with ring wall
Technical specification for design and construction of beach and seawall
Surveying technology standard for Huaihai project
Technical specification for investigation of lake and sea geotechnical engineering
Inspection and installation specification
Reporting and acceptance of steel pipes
Quality inspection and assessment standard for petroleum construction project
Technical standard for cathodic protection of outer wall of bottom of steel tank
The above standards shall be implemented from June 1, 1996 China National Petroleum Corporation
December 18, 1995
? General provisions
) Methods for the corrosion and protection of the outer wall of steel pipelines (54 Methods for the corrosion and protection of steel storage tanks (19)
5 Methods for the inspection of the inner wall corrosion and protection of steel pipelines (29)
6 Evaluation indicators
7 Investigation report
w (39)
(45
Appendix A Appendix B Gas Corrosion Monitoring Method (Lubricant Cell Method) (49 Appendix C Layered Coupon Test Method for Corrosion Condition of Medium in Tanks (31) Appendix D Slow Foil Statistical Processing and Service Life Estimation Method for Maximum Corrosion Resistance Depth
Field Monitoring Method for Protection Effect of Anti-corrosion Layer in Pipeline and Corrosion Condition of Pipeline Inner Wall
Appendix Various Lookup Tables (6)
Appendix G Explanation of the Use of This Standard ||tt ||Application
Part: Standard for Investigation Methods of Corrosion and Protection of Steel Pipes and Tanks (93)
【General Provisions
L.01 This standard is formulated to scientifically and accurately investigate and evaluate the dynamics and effects of corrosion and protection of steel pipelines and tanks, unify the investigation methods, and provide a basis for the control of pipeline and tank fan corrosion.
1.0.2 This standard applies to the following scopes:
(1) Investigation of external wall corrosion and protection of steel pipelines (2) Investigation of external wall corrosion and protection of steel tanks (3) Investigation on the inner wall erosion and protection of pipelines transporting crude oil and water. The inner and outer wall erosion and protection of steel pipelines or containers transporting other media, the outer wall of process pipelines in stations (depots) and the inner wall of long-distance pipelines can be carried out in accordance with this standard.
1.0.3 In addition to the implementation of the vehicle standard, the investigation on the erosion and protection of pipelines and tanks should also comply with the provisions of the relevant current national standards (specifications). 1.0.4 Reference standards:
G B/T250-17 Determination of moisture content in petroleum products GB/T264-83 Determination of acid value in petroleum products GB/T387-90 Determination of water content in dark petroleum products Tubular furnace method GB/T8810-88 Test method for water absorption of rigid foam plastics GB/T8813--8S Compression test method for rigid foam plastics GB1576-85 Low-pressure furnace water quality standard GB/T6532-86 Determination of total content of crude oil and its products GB/T6908-86 Determination of conductivity of water used for separation and net water SYI17-86 Technical standard for direct current drainage protection of pipelines of Institute of Geology and Geophysics SYJ23--86 Buried steel pipes are suitable for corrosion protection test 2 General provisions
2.0.1 During the investigation, the noise should be analyzed indoors. The noise samples for testing should be taken by the on-site survey personnel and sent to a qualified professional laboratory for analysis according to the test methods specified in the technical standard.
2.0.2 Before the investigation, a survey network should be prepared. The entire investigation work must be participated by a corrosion engineer and conducted by a corrosion and protection professional team. 2.0.3 Safety issues in the isolation and protection investigation shall comply with relevant The provisions of the standard shall not reduce or damage the safety of the original pipelines and storage tanks. 4
3 Investigation methods for corrosion and protection of the outer wall of buried steel pipelines 3I Investigation classification
3.1.1 Full survey: A macroscopic and systematic evaluation of the corrosion and protection status of the outer wall of the pipeline in the entire pipeline or a block of the oil and gas field. The results can guide key adjustments.
3.1.2 Key investigation: A more in-depth and specific investigation of the common parts and facilities (such as elbows, pipeline entry and exit sliding, casing, racks, welds, protective layer patching, etc.) of the pipeline in the key sections or regions confirmed by other procedures based on the results of the full survey.
3.1.3 Daily investigation: Daily measurement and adjustment of the corrosion and protection status of the outer wall of the pipeline.
3.2 Survey Content
3.21 Full Line Survey
3.21.1 The full line survey must measure the following parameters: (1) Soil quality:
(2) Natural potential of pipeline:
(3) Insulation resistance of anti-separation layer or inspection of anti-separation layer defects (4) Pipeline negative protection potential
The measurement methods of the above four parameters shall be in accordance with the provisions of Table 3.2.1. The insulation resistance of the anti-separation layer can use the data of the past three years. The rest shall be measured during the survey. 3.2.1.2 For common parts or facilities, such as elbows, pipe sections entering and exiting the earth filling end, casing, pipe racks, etc., spot checks can be carried out as appropriate. The number of spot checks should be controlled at 5% to 10% of the total number of such parts or facilities, but shall not be less than 6. 321.3 The relationship between the external environment and the pipe shall be examined. The main contents are as follows:
Pre-test
Self-base, power protection
Protection parts
Soil load release
Cross-washing interference
Dry belly
Blog construction supervision road inspection
Gold wire investigation reference test method
Guochun Office
SISYTSOAD
SYTEI9||tt| |SY/T5919#7 core
anti-electric measuring instrument
there are batches of dry, air addition
there are dry support, such as
(1) AC, DC electrified railway and its rectifier station, substation and pipeline parallel, mutual position relationship
12) AC, DC electric lines, substation, rectifier station and pipeline parallel, mutual position relationship
(3) Bacterial commercial god status
(4) Upper Yao landform (such as chemical pollution area, etc.) and its approximate distribution: (5) Pipeline erosion and protection history
3.2.2 Key straightening
3.2.2.1 Pipeline sections or oil mountain blocks for key investigation. Generally, the decision should be made based on comprehensive analysis and evaluation of the results of the full line inspection, and the management department can confirm it through other procedures based on the actual situation. 3.2.22 The section with one of the following conditions can be determined as the key adjustment point: (1) Sections with DC discharge batteries: (2) Sections with air flow and porcelain: (3) Sections (blocks) prone to corrosion accidents: (4) Sections with bacterial corruption: (5) Sections with strong soil isolation: (6) Sections with poor protection conditions: (7) Sections determined by comprehensive evaluation of the four indicators that must be measured in the full line inspection (8) Sections with common characteristics. During the operation of the facility, if there are more damaged or failed parts or facilities, (9) their quality (including the pipe sections that have undergone major repairs such as anti-detachment layer) 3.2.2.3 The key investigation should be deepened, refined and expanded on the basis of the full-line survey. Its main contents are as follows: (1) Pipe body corrosion status and classification: Analysis of the causes of pipe body corrosion (2) Environmental corrosion characteristics, including sample collection and physical and chemical properties analysis, on-site sample weight loss test, etc. (3) Pipe ground potential distribution, including natural potential, protective potential, drift potential, and axial potential gradient: (4) Direct (cross) interference with the pipe section. Evaluation and analysis of the technical status of protective joints:
(5) Analysis and evaluation of the effectiveness of cathodic protection: (6) Detailed investigation and evaluation of the technical status of the anti-corrosion layer, the number of anti-corrosion layer defects, etc.,
(7) Collection and analysis of relevant information on the pipeline construction and operation history and external environmental impacts
(8) Its location.
3.2.3 Daily survey
3.231 Daily survey shall comply with the provisions of SY/T5919-94: the management department may formulate implementation details according to its requirements and actual conditions. 3.2.3.2 Daily survey shall include the following contents: (1) Monitoring and adjustment of operating parameters of electrical protection; (2) Monitoring of effectiveness of electrical protection, investigation and analysis of protection degree, protection rate and operation rate.
(3) Monitoring of effectiveness of anti-corrosion layer (insulation layer) (leakage control and insulation resistance measurement)
(4) Recording, investigation and analysis of corrosion accidents (5) Changes in natural high corrosion barrier of pipelines
33 Survey cycle
3.3.1 Full-line survey cycle
(1) New pipeline put into operation? Complete the first full-line survey within the year (2) A full-line survey shall be conducted once in the 10th year of operation: (3) For pipelines that have been in operation for more than 10 years, a survey shall be conducted every 5 years; (4) Under special circumstances, the competent department shall determine 33.2 Key survey cycle
Key adjustments shall be conducted every 3 years, but the DC section shall be surveyed, adjusted and evaluated once a year.
333 Daily survey cycle
Follow the provisions of Table 3.3.3. The management department may also adjust it at its own discretion, but it should not be lower than the requirements of Table 3.3.3.
Daily investigation main project cycle
Strong auxiliary power
Rehearsal protection
protection system washing
Wing Sheng inner narrow
Temperature potential false transportation hospital
Careful electric receiving instrument protection
Automatic control material reference TV
Ground support flange, this army carries the left if the price check
Yangtou Yuedi electric park test
Extract electric reduction, anode open circuit electric parts, automatic
smart ground computer
blocking Line inspection
Flow-carrying facilities inspection
Once a month
Once a month
Once a year
Quarterly
Once a quarter
Once a year
Unmanned firefighting river uses a
Unmanned this time seasonal inspection
Electric point potential, receiver signal output
tank, voltage
Bone protection potential (steel value
Supervisory communication. Hotline
Exchange , choose to reduce the protection and make adjustmentsbzxz.net
An: There are flow dry technical codes "only use electricity
Detection and care analysis
Rui line rate classification
Protection rate classification
Protection power density meter
Prevention end pressure absolute gap electric awakening measurement station
Green specification to see full (distance lkm)
Join the wine volume (positive value 1~3L-)
Prevention device can prevent leakage detection
Resistance estimation 3~010m above general
Figure 3~k0 period before
Electric protection control materials
Technical information on job explanation
Confirmation information on the meeting
Cut protection emergency information
H test
Sweep once a month
Once a year
Once a year
Stop once a year
Once a month
Total number of studies
Sweep once a month
Once a month|| tt||Once every 1 year
Once every 3 years
Once every year
Once every year
After the management
Detection Qu Zheng
Li Sales Management Enterprise Management
Reasonable test film surface method
Deep use of self-time
Every year 1V3 counts 3
Annual celebration
Items: New Year meal
Investigation film stewed skin
Record when it occurs, annual
loss of special time 2h
Monthly solution, age management
more than
3.4 Preparation before investigation
1.4.I Collect the following basic information and fill in the F form FI for this standard (1) Pipeline direction and strip interval
(2) Pipeline material, pipe diameter, wall thickness, connection method, pipe type and related process spare parts, etc.:
(3) External insulation (leakage protection) type structure, thickness, patching, repair and other information
【4） (5) A table of pipeline ancillary facilities, railways, highways, river crossing projects and related information; (6) Land and environment information of the areas where the pipeline passes (7) Detailed information on the date of commissioning of the pipeline and all previous leakage accidents, repairs, overhauls, etc. after commissioning. 34.1 Site survey and configuration of necessary special tables, equipment, and minimum configuration types should be in accordance with the current provisions of Table 3.4.2. |3.4.3 The technical performance of the equipment used in the investigation shall comply with the provisions of SYI23--86 and SY/T5919-94: the special equipment for on-site investigation shall be verified before the investigation.
Name and model
Zhaoyu resistance tester
Wanzhou frost
Zero group full meter
Pure comprehensive resistance oil lubrication instrument
Diaoshen index
New code: 15% off
Bai Liu Nei Yan is too red. Each flow limit f
precision: 10 yuan
Economic police: 03-20Hz, #
name and
automatic leveling record false
special ratio electric board
electric fish glue mouse false
Shanghai sail department life Si decision
financial question test guide
separation of deep moisturizing test health
device small use
covered power supply
national sample tool dyeing product
home function test play box
current price index
zero friend in the center
net point to, on the process: can not be 0
1: price area: 834
CrCusO,Battery
Xu out of the electric light at 0
Strength line: 1-30mA: grid line: 05gA
Product number: 0-2mm2-4mm
-What surface to use
Accuracy: 0.0.m
Quality: 2imm: Fine world: 0.mm
With moxibustion, surface road junction replacement
With electric head with #
Can use micrometer, card|| tt||The micrometer can be used to convert the empty flow into the flow, and the measurement can be performed.
Aiyuan Dry Pipe
35 Determination and distribution of survey scope and survey points 3.5.1 Full-line survey
3.5.1.1 The scope of the full-line survey should be a complete pipeline or a relatively independent block in the oil field
3.51.2 In the case of a single situation, the four-frequency parameters that must be measured should be set up with a survey point for every kilometer. When it is confirmed that the soil properties are uniform: the soil erosion survey point can be set up at a maximum of every 3km
3.5.1.3 Spot check items in the full-line survey (such as elbows: set camps, etc.). The adjustment points should not be continuous but concentrated, and should be located at different representative locations.
3.5.1.4 If the alternate route is short, the pipeline census can be combined with the key investigation, focusing on the key adjustment.
3.5.1.5 Under normal circumstances, anti-probe investigation may not be conducted for the full-line census. For example, when conducting a pit operation investigation, pipe sections with different measured parameter values should be selected. The number of exploration pits should be no less than 3, and the interval should be 1kmt
3.5.2 Key investigation
35.2.1 The key investigation section should be controlled at the edge of the proposed key section. The distance can be adjusted according to the actual situation, but it should not be lower than the requirements of the following provisions. (1) DC stray current interference section - should comply with the provisions of SYJ17-86 (2) AC interference section, the length of the interference section is determined, and the interval between investigation points should be 500-1000m. For some sections with serious interference, the adjustment points should be densely arranged, and the interval should be 100-500m
(3) For sections with many corrosion accidents, equidistant pit exploration should be carried out, and the interval between exploration pits should be 200-500m. When it is found that a section in the exploration area has serious corrosion and other abnormalities. Additional exploration pits should be added on both sides of the exploration pit at intervals of 10 to 30 m until the anomaly disappears. (4) For key investigations of the exploration of the anti-corrosion layer of oil pipelines, investigation points should be arranged according to the insulation resistance value, and the exploration spacing may comply with the provisions of Table 35.2. Relationship between exploration pit spacing and insulation resistance
Peak resistance (m: m)
Table 352
Exploration limit (m)
51-200
When the insulation resistance is greater than 3000 m, representative points (such as iron leakage points) should be selected for exploration pit design based on the ground leak detection results of the anti-corrosion layer. In this case, the provisions of Table 3.5.2 may not be met.
(5) For the measurement of the ground potential (self-heating potential and protective potential) of the pipeline in the key investigation, it is advisable to adopt the measurement drift method. When measuring the longitudinal potential gradient, the reference electrode spacing is [~5m. The selection of the transverse potential gradient measurement position should be based on the longitudinal potential distribution.
(6) The soil fill IR drop investigation point should be selected in the pipe section with a larger protective potential distribution curve. The investigation point spacing should be 500-1000m. 3.5.2.3 When conducting pit exploration, the distribution of the exploration pit should be arranged according to the principle of "one pit for multiple uses", and the data of all investigation projects should be collected as completely as possible. 3.5.3 Routine investigation
3.531 The investigation points of cathodic protection should use the original test points or devices. Generally, there is no need to add
3.5.32 The two investigation points of other ground projects shall comply with the provisions of SY/T5919-94.
3.6 Handling of survey points, adjustment items and methods 3.6.1 General principles for handling survey points
3.6.11 When the survey point is an existing test device, it should be ensured to be intact and reliable, and should be maintained when necessary.
3.6.1.2 Newly added survey points should be installed or converted into permanent test devices 3.6.1.3 The exposed section in the exploration pit should have an exposed length of not less than 1m. During excavation, the soil layers should be kept in order and returned to the environment in layers according to the soil layer sequence after inspection. 3.6.1.4 Samples collected on site should be collected, sealed and kept in accordance with relevant regulations.
3.6.1.5 Destructive inspection should be avoided as much as possible. The anti-separation layer damaged during the inspection or the pipe damage found should be repaired, and its quality standard should not be lower than the original level of the pipeline. 3.6.2 Inspection items and methods for pipeline corrosion conditions 3-
36.2.1: Detailed conditions, high-pressure injection parts (uniform, non-uniform, fine! Thickness. Color, structure! Layering technology, model! Porosity! Tightness (loose, tight, hard), and the field corrosion conditions should be tested. 3.6.2.2 The composition of the oil separation product is shown in the field order step purple determination (D) Chemical method adjustment: Take a small amount of the product in a small test tube, add 1 0% hydrochloric acid, if there are no bubbles, it indicates that the etchant is FeO. If there is gas, it does not change the color of the wet lead acetic acid test paper, it can be judged as FcO. If there is an odor and it changes the color of the wet lead aldehyde orange test paper, it may be FeS. For further composition and structure analysis, the sample can be collected on site, sealed and stored, and then sent to the laboratory for analysis. (2) Visual inspection method: Preliminary identification is made based on the product color traces in Table 36.2-1.
In-situ chest corrosion product composition identification (visual method) Table 3.6.2-1
Product color
Order to delivery
Main components
Product number and structure|| tt||Big pain shaped products
No fixation powder and deconstruction
Big Nan shaped cleaning products
Hexagonal or no wet shadow station crystal
Three Nan shaped test
3.6.23 After removing the Shangdi product, observe and record the surface conditions, Li Zhaoqiu 362-! Fixed brain turbidity type, if the average corrosion and pitting are mixed, it can be estimated according to the main corrosion direction.
3.6.2.4 Measure the corrosion surface, use a meter to measure the pit depth (accurate to 0.3mml, at least measure the deepest hole, record the maximum corrosion depth, technical formula 136.2) Calculate the maximum pitting rate 1 elastic shoe gold smell Surface corrosion condition diagram should also indicate the area where weld corrosion occurs (parent metal, heat affected zone, crack) -14
Corrosion surface type characteristics
Table 3.6.1-1
Hui fast deep learning control uniformity, create a large
ion quantity resistance. Scattered small specialist. Quantity hemp, hole protection (3.6.2)
Where——Years of production (a):
Y—Maximum pitting rate (mm/a)
（—Maximum corrosion source depth (mm)
3.6.2.5 Draw a ion distribution diagram and fill in the survey data in the standard record F table FI 3.6.3 Detection items and methods of weak erosion 3.6.3.1 The soil surface of each exploration site should be described in layers, including soil color, field observation of soil dryness (divided into five levels: light, moist, damp, wet, and water): soil filling, field observation of soil tightness (divided into five levels: loose, tight, tight, and very tight), plant root system, groundwater level, 3.6.3.2 According to SY/T 5919-94 Appendix C method, test soil corrosion current density and field buried test piece isolation rate 3.6.3.3 Soil physical and chemical properties should be adjusted with the following parameters: (1) Soil resistivity
(2) Oxidation-reduction potential;
(3) pH value
(4) Water content
(5) Soil bulk density:
(6) Radium ions
(7) Sulfate ions:5. Under normal circumstances, the whole line survey does not need to conduct anti-exploration survey. If the survey is conducted with pit operation, the pipe sections with different measured parameter values should be selected. The number of exploration pits should be no less than 3, and the interval should be lkmt
3.5.2 Key survey
35.2.1 The key survey section should be controlled at the edge of the proposed key section. The distance can be adjusted according to the actual situation, but it should not be lower than the requirements of the following regulations (1) DC stray current dry batch pipe section - should comply with the provisions of SYJ17-86 (2) AC interference pipe section, the length of the interfered pipe section is determined, and the distance between survey points is preferably 500-1000m. For some pipe sections with serious dry patching, the adjustment points should be arranged more densely, and the spacing between them should be 100-500m. (3) For pipe sections with frequent corrosion accidents, equidistant pit exploration should be carried out, and the spacing between exploration pits should be 200-500m. When a pipe section in the exploration area is found to have serious corrosion and other abnormalities. Additional exploration pits should be added on both sides of the exploration pit at intervals of 10 to 30 m until the anomaly disappears. (4) For key investigations of the exploration of the anti-corrosion layer of oil pipelines, investigation points should be arranged according to the insulation resistance value, and the exploration spacing may comply with the provisions of Table 35.2. Relationship between exploration pit spacing and insulation resistance
Peak resistance (m: m)
Table 352
Exploration limit (m)
51-200
When the insulation resistance is greater than 3000 m, representative points (such as iron leakage points) should be selected for exploration pit design based on the ground leak detection results of the anti-corrosion layer. In this case, the provisions of Table 3.5.2 may not be met.
(5) For the measurement of the ground potential (self-heating potential and protective potential) of the pipeline in the key investigation, it is advisable to adopt the measurement drift method. When measuring the longitudinal potential gradient, the reference electrode spacing is [~5m. The selection of the transverse potential gradient measurement position should be based on the longitudinal potential distribution.
(6) The soil fill IR drop investigation point should be selected in the pipe section with a larger protective potential distribution curve. The investigation point spacing should be 500-1000m. 3.5.2.3 When conducting pit exploration, the distribution of the exploration pit should be arranged according to the principle of "one pit for multiple uses", and the data of all investigation projects should be collected as completely as possible. 3.5.3 Routine investigation
3.531 The investigation points of cathodic protection should use the original test points or devices. Generally, there is no need to add
3.5.32 The two investigation points of other ground projects shall comply with the provisions of SY/T5919-94.
3.6 Handling of survey points, adjustment items and methods 3.6.1 General principles for handling survey points
3.6.11 When the survey point is an existing test device, it should be ensured to be intact and reliable, and should be maintained when necessary.
3.6.1.2 Newly added survey points should be installed or converted into permanent test devices 3.6.1.3 The exposed section in the exploration pit should have an exposed length of not less than 1m. During excavation, the soil layers should be kept in order and returned to the environment in layers according to the soil layer sequence after inspection. 3.6.1.4 Samples collected on site should be collected, sealed and kept in accordance with relevant regulations.
3.6.1.5 Destructive inspection should be avoided as much as possible. The anti-separation layer damaged during the inspection or the pipe damage found should be repaired, and its quality standard should not be lower than the original level of the pipeline. 3.6.2 Inspection items and methods for pipeline corrosion conditions 3-
36.2.1: Detailed conditions, high-pressure injection parts (uniform, non-uniform, fine! Thickness. Color, structure! Layering technology, model! Porosity! Tightness (loose, tight, hard), and the field corrosion conditions should be tested. 3.6.2.2 The composition of the oil separation product is shown in the field order step purple determination (D) Chemical method adjustment: Take a small amount of the product in a small test tube, add 1 0% hydrochloric acid, if there are no bubbles, it indicates that the etchant is FeO. If there is gas, it does not change the color of the wet lead acetic acid test paper, it can be judged as FcO. If there is an odor and it changes the color of the wet lead aldehyde orange test paper, it may be FeS. For further composition and structure analysis, the sample can be collected on site, sealed and stored, and then sent to the laboratory for analysis. (2) Visual inspection method: Preliminary identification is made based on the product color traces in Table 36.2-1.
In-situ chest corrosion product composition identification (visual method) Table 3.6.2-1
Product color
Order to delivery
Main components
Product number and structure|| tt||Big pain shaped products
No fixation powder and deconstruction
Big Nan shaped cleaning products
Hexagonal or no wet shadow station crystal
Three Nan shaped test
3.6.23 After removing the Shangdi product, observe and record the surface conditions, Li Zhaoqiu 362-! Fixed brain turbidity type, if the average corrosion and pitting are mixed, it can be estimated according to the main corrosion direction.
3.6.2.4 Measure the corrosion surface, use a meter to measure the pit depth (accurate to 0.3mml, at least measure the deepest hole, record the maximum corrosion depth, technical formula 136.2) Calculate the maximum pitting rate 1 elastic shoe gold smell Surface corrosion condition diagram should also indicate the area where weld corrosion occurs (parent metal, heat affected zone, crack) -14
Corrosion surface type characteristics
Table 3.6.1-1
Hui fast deep learning control uniformity, create a large
ion quantity resistance. Scattered small specialist. Quantity hemp, hole protection (3.6.2)
Where——Years of production (a):
Y—Maximum pitting rate (mm/a)
（—Maximum corrosion source depth (mm)
3.6.2.5 Draw a ion distribution diagram and fill in the survey data in the standard record F table FI 3.6.3 Detection items and methods of weak erosion 3.6.3.1 The soil surface of each exploration site should be described in layers, including soil color, field observation of soil dryness (divided into five levels: light, moist, damp, wet, and water): soil filling, field observation of soil tightness (divided into five levels: loose, tight, tight, and very tight), plant root system, groundwater level, 3.6.3.2 According to SY/T 5919-94 Appendix C method, test soil corrosion current density and field buried test piece isolation rate 3.6.3.3 Soil physical and chemical properties should be adjusted with the following parameters: (1) Soil resistivity
(2) Oxidation-reduction potential;
(3) pH value
(4) Water content
(5) Soil bulk density:
(6) Radium ions
(7) Sulfate ions:5. Under normal circumstances, the whole line survey does not need to conduct anti-exploration survey. If the survey is conducted with pit operation, the pipe sections with different measured parameter values should be selected. The number of exploration pits should be no less than 3, and the interval should be lkmt
3.5.2 Key survey
35.2.1 The key survey section should be controlled at the edge of the proposed key section. The distance can be adjusted according to the actual situation, but it should not be lower than the requirements of the following regulations (1) DC stray current dry batch pipe section - should comply with the provisions of SYJ17-86 (2) AC interference pipe section, the length of the interfered pipe section is determined, and the distance between survey points is preferably 500-1000m. For some pipe sections with serious dry patching, the adjustment points should be arranged more densely, and the spacing between them should be 100-500m. (3) For pipe sections with frequent corrosion accidents, equidistant pit exploration should be carried out, and the spacing between exploration pits should be 200-500m. When a pipe section in the exploration area is found to have serious corrosion and other abnormalities. Additional exploration pits should be added on both sides of the exploration pit at intervals of 10 to 30 m until the anomaly disappears. (4) For key investigations of the exploration of the anti-corrosion layer of oil pipelines, investigation points should be arranged according to the insulation resistance value, and the exploration spacing may comply with the provisions of Table 35.2. Relationship between exploration pit spacing and insulation resistance
Peak resistance (m: m)
Table 352
Exploration limit (m)
51-200
When the insulation resistance is greater than 3000 m, representative points (such as iron leakage points) should be selected for exploration pit design based on the ground leak detection results of the anti-corrosion layer. In this case, the provisions of Table 3.5.2 may not be met.
(5) For the measurement of the ground potential (self-heating potential and protective potential) of the pipeline in the key investigation, it is advisable to adopt the measurement drift method. When measuring the longitudinal potential gradient, the reference electrode spacing is [~5m. The selection of the transverse potential gradient measurement position should be based on the longitudinal potential distribution.
(6) The soil fill IR drop investigation point should be selected in the pipe section with a larger protective potential distribution curve. The investigation point spacing should be 500-1000m. 3.5.2.3 When conducting pit exploration, the distribution of the exploration pit should be arranged according to the principle of "one pit for multiple uses", and the data of all investigation projects should be collected as completely as possible. 3.5.3 Routine investigation
3.531 The investigation points of cathodic protection should use the original test points or devices. Generally, there is no need to add
3.5.32 The two investigation points of other ground projects shall comply with the provisions of SY/T5919-94.
3.6 Handling of survey points, adjustment items and methods 3.6.1 General principles for handling survey points
3.6.11 When the survey point is an existing test device, it should be ensured to be intact and reliable, and should be maintained when necessary.
3.6.1.2 Newly added survey points should be installed or converted into permanent test devices 3.6.1.3 The exposed section in the exploration pit should have an exposed length of not less than 1m. During excavation, the soil layers should be kept in order and returned to the environment in layers according to the soil layer sequence after inspection. 3.6.1.4 Samples collected on site should be collected, sealed and kept in accordance with relevant regulations.
3.6.1.5 Destructive inspection should be avoided as much as possible. The anti-separation layer damaged during the inspection or the pipe damage found should be repaired, and its quality standard should not be lower than the original level of the pipeline. 3.6.2 Inspection items and methods for pipeline corrosion conditions 3-
36.2.1: Detailed conditions, high-pressure injection parts (uniform, non-uniform, fine! Thickness. Color, structure! Layering technology, model! Porosity! Tightness (loose, tight, hard), and the field corrosion conditions should be tested. 3.6.2.2 The composition of the oil separation product is shown in the field order step purple determination (D) Chemical method adjustment: Take a small amount of the product in a small test tube, add 1 0% hydrochloric acid, if there are no bubbles, it indicates that the etchant is FeO. If there is gas, it does not change the color of the wet lead acetic acid test paper, it can be judged as FcO. If there is an odor and it changes the color of the wet lead aldehyde orange test paper, it may be FeS. For further composition and structure analysis, the sample can be collected on site, sealed and stored, and then sent to the laboratory for analysis. (2) Visual inspection method: Preliminary identification is made based on the product color traces in Table 36.2-1.
In-situ chest corrosion product composition identification (visual method) Table 3.6.2-1
Product color
Order to delivery
Main components
Product number and structure|| tt||Big pain shaped products
No fixation powder and deconstruction
Big Nan shaped cleaning products
Hexagonal or no wet shadow station crystal
Three Nan shaped test
3.6.23 After removing the Shangdi product, observe and record the surface conditions, Li Zhaoqiu 362-! Fixed brain turbidity type, if the average corrosion and pitting are mixed, it can be estimated according to the main corrosion direction.
3.6.2.4 Measure the corrosion surface, use a meter to measure the pit depth (accurate to 0.3mml, at least measure the deepest hole, record the maximum corrosion depth, technical formula 136.2) Calculate the maximum pitting rate 1 elastic shoe gold smell Surface corrosion condition diagram should also indicate the area where weld corrosion occurs (parent metal, heat affected zone, crack) -14
Corrosion surface type characteristics
Table 3.6.1-1
Hui fast deep learning control uniformity, create a large
ion quantity resistance. Scattered small specialist. Quantity hemp, hole protection (3.6.2)
Where——Years of production (a):
Y—Maximum pitting rate (mm/a)
（—Maximum corrosion source depth (mm)
3.6.2.5 Draw a ion distribution diagram and fill in the survey data in the standard record F table FI 3.6.3 Detection items and methods of weak erosion 3.6.3.1 The soil surface of each exploration site should be described in layers, including soil color, field observation of soil dryness (divided into five levels: light, moist, damp, wet, and water): soil filling, field observation of soil tightness (divided into five levels: loose, tight, tight, and very tight), plant root system, groundwater level, 3.6.3.2 According to SY/T 5919-94 Appendix C method, test soil corrosion current density and field buried test piece isolation rate 3.6.3.3 Soil physical and chemical properties should be adjusted with the following parameters: (1) Soil resistivity
(2) Oxidation-reduction potential;
(3) pH value
(4) Water content
(5) Soil bulk density:
(6) Radium ions
(7) Sulfate ions:32 The two survey points of the project shall comply with the provisions of SY/T5919-94.
3.6 Handling of survey points, adjustment of items and methods 3.6.1 General principles for handling survey points
3.6.11 When the survey point is an existing test device, it should be ensured to be intact and reliable, and should be maintained when necessary
3.6.1.2 The newly added survey points should be installed or transformed into permanent test devices 3.6.1.3 The exposed section in the exploration pit should have an exposed length of no less than 1m. The soil layers should be kept in order during excavation. After the survey, the soil layers should be returned to the environment in layers according to the soil layer sequence 3.6.1.4 The samples collected on site should be collected, sealed and kept according to the relevant regulations.
3.6.1.5 Destructive inspection should be avoided as much as possible. The anti-separation layer damaged during the inspection or the pipe damage found should be repaired, and its quality standard should not be lower than the original level of the pipeline. 3.6.2 Inspection items and methods for pipeline corrosion conditions 3-
36.2.1: Detailed conditions, high-pressure injection parts (uniform, non-uniform, fine! Thickness. Color, structure! Layering technology, model! Porosity! Tightness (loose, tight, hard), and the field corrosion conditions should be tested. 3.6.2.2 The composition of the oil separation product is shown in the field order step purple determination (D) Chemical method adjustment: Take a small amount of the product in a small test tube, add 1 0% hydrochloric acid, if there are no bubbles, it indicates that the etchant is FeO. If there is gas, it does not change the color of the wet lead acetic acid test paper, it can be judged as FcO. If there is an odor and it changes the color of the wet lead aldehyde orange test paper, it may be FeS. For further composition and structure analysis, the sample can be collected on site, sealed and stored, and then sent to the laboratory for analysis. (2) Visual inspection method: Preliminary identification is made based on the product color traces in Table 36.2-1.
In-situ chest corrosion product composition identification (visual method) Table 3.6.2-1
Product color
Order to delivery
Main components
Product number and structure|| tt||Big pain shaped products
No fixation powder and deconstruction
Big Nan shaped cleaning products
Hexagonal or no wet shadow station crystal
Three Nan shaped test
3.6.23 After removing the Shangdi product, observe and record the surface conditions, Li Zhaoqiu 362-! Fixed brain turbidity type, if the average corrosion and pitting are mixed, it can be estimated according to the main corrosion direction.
3.6.2.4 Measure the corrosion surface, use a meter to measure the pit depth (accurate to 0.3mml, at least measure the deepest hole, record the maximum corrosion depth, technical formula 136.2) Calculate the maximum pitting rate 1 elastic shoe gold smell Surface corrosion condition diagram should also indicate the area where weld corrosion occurs (parent metal, heat affected zone, crack) -14
Corrosion surface type characteristics
Table 3.6.1-1
Hui fast deep learning control uniformity, create a large
ion quantity resistance. Scattered small specialist. Quantity hemp, hole protection (3.6.2)
Where——Years of production (a):
Y—Maximum pitting rate (mm/a)
（—Maximum corrosion source depth (mm)
3.6.2.5 Draw a ion distribution diagram and fill in the survey data in the standard record F table FI 3.6.3 Detection items and methods of weak erosion 3.6.3.1 The soil surface of each exploration site should be described in layers, including soil color, field observation of soil dryness (divided into five levels: light, moist, damp, wet, and water): soil filling, field observation of soil tightness (divided into five levels: loose, tight, tight, and very tight), plant root system, groundwater level, 3.6.3.2 According to SY/T 5919-94 Appendix C method, test soil corrosion current density and field buried test piece isolation rate 3.6.3.3 Soil physical and chemical properties should be adjusted with the following parameters: (1) Soil resistivity
(2) Oxidation-reduction potential;
(3) pH value
(4) Water content
(5) Soil bulk density:
(6) Radium ions
(7) Sulfate ions:32 The two survey points of the project shall comply with the provisions of SY/T5919-94.
3.6 Handling of survey points, adjustment of items and methods 3.6.1 General principles for handling survey points
3.6.11 When the survey point is an existing test device, it should be ensured to be intact and reliable, and should be maintained when necessary
3.6.1.2 The newly added survey points should be installed or transformed into permanent test devices 3.6.1.3 The exposed section in the exploration pit should have an exposed length of no less than 1m. The soil layers should be kept in order during excavation. After the survey, the soil layers should be returned to the environment in layers according to the soil layer sequence 3.6.1.4 The samples collected on site should be collected, sealed and kept according to the relevant regulations.
3.6.1.5 Destructive inspection should be avoided as much as possible. The anti-separation layer damaged during the inspection or the pipe damage found should be repaired, and its quality standard should not be lower than the original level of the pipeline. 3.6.2 Inspection items and methods for pipeline corrosion conditions 3-
36.2.1: Detailed conditions, high-pressure injection parts (uniform, non-uniform, fine! Thickness. Color, structure! Layering technology, model! Porosity! Tightness (loose, tight, hard), and the field corrosion conditions should be tested. 3.6.2.2 The composition of the oil separation product is shown in the field order step purple determination (D) Chemical method adjustment: Take a small amount of the product in a small test tube, add 1 0% hydrochloric acid, if there are no bubbles, it indicates that the etchant is FeO. If there is gas, it does not change the color of the wet lead acetic acid test paper, it can be judged as FcO. If there is an odor and it changes the color of the wet lead aldehyde orange test paper, it may be FeS. For further composition and structure analysis, the sample can be collected on site, sealed and stored, and then sent to the laboratory for analysis. (2) Visual inspection method: Preliminary identification is made based on the product color traces in Table 36.2-1.
In-situ chest corrosion product composition identification (visual method) Table 3.6.2-1
Product color
Order to delivery
Main components
Product number and structure|| tt||Big pain shaped products
No fixation powder and deconstruction
Big Nan shaped cleaning products
Hexagonal or no wet shadow station crystal
Three Nan shaped test
3.6.23 After removing the Shangdi product, observe and record the surface conditions, Li Zhaoqiu 362-! Fixed brain turbidity type, if the average corrosion and pitting are mixed, it can be estimated according to the main corrosion direction.
3.6.2.4 Measure the corrosion surface, use a meter to measure the pit depth (accurate to 0.3mml, at least measure the deepest hole, record the maximum corrosion depth, technical formula 136.2) Calculate the maximum pitting rate 1 elastic shoe gold smell Surface corrosion condition diagram should also indicate the area where weld corrosion occurs (parent metal, heat affected zone, crack) -14
Corrosion surface type characteristics
Table 3.6.1-1
Hui fast deep learning control uniformity, create a large
ion quantity resistance. Scattered small specialist. Quantity hemp, hole protection (3.6.2)
Where——Years of production (a):
Y—Maximum pitting rate (mm/a)
（—Maximum corrosion source depth (mm)
3.6.2.5 Draw a ion distribution diagram and fill in the survey data in the standard record F table FI 3.6.3 Detection items and methods of weak erosion 3.6.3.1 The soil surface of each exploration site should be described in layers, including soil color, field observation of soil dryness (divided into five levels: light, moist, damp, wet, and water): soil filling, field observation of soil tightness (divided into five levels: loose, tight, tight, and very tight), plant root system, groundwater level, 3.6.3.2 According to SY/T 5919-94 Appendix C method, test soil corrosion current density and field buried test piece isolation rate 3.6.3.3 Soil physical and chemical properties should be adjusted with the following parameters: (1) Soil resistivity
(2) Oxidation-reduction potential;
(3) pH value
(4) Water content
(5) Soil bulk density:
(6) Radium ions
(7) Sulfate ions:
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