Standard test method for insulating and sealing effectiveness of joint in coating pipeline
Some standard content:
Standard Test Method for Insulating and Sealing Effectiveness of Jolnt In Coating PipelinesSY 0074-93
Editor: China Petroleum and Natural Gas Bureau Staff CollegeApproval: China National Petroleum CorporationTravel Date: March 1, 1994
Petroleum Industry Press
1993·Beijing
Standard Test Method for Insulating and Sealing Effectiveness of Jolnt In Coating Pipelines5Y 0074-93
Record description
Petroleum Industry Press
1993·Beijing
Petroleum construction project quality inspection and calibration oilfield collection 23SY4053-93
Supply pipeline engineering (agent SY4059-92)
24 SY/1408-93 Petroleum rapid design engineering quality standard thermal conductivity anti-corrosion and super corrosion protection steel pipe brand
25 SY/T:480-13 Petroleum construction project quality inspection and assessment standard oil daily steel container production
26SY 4070-93 Petroleum and natural gas pipeline site selection project construction and acceptance specification 27SY/T4071--9: Downward cover connection process specification The above Shanghai road shall be implemented from March 1, 1994. China National Petroleum and Natural Gas Corporation
September 9, 1993
It is impossible to summarize
Significance and use.
4 Instruments and equipment.
5 Reagents and materials
B Preparation of test pieces
Test procedures
8 Calculation
9 Report
10 Precision
Appendix A Explanation of terms
China National Petroleum and Natural Gas Corporation document
(83) Zhongyoujizi No. 598
Notice on the approval and release of 27 oil and gas industry standards including "Regulations for the Preparation of Oil Surface Engineering Design Documents"
To all relevant units and relevant petroleum professional standardization technical committees, the draft standards of 27 standards including "Regulations for the Preparation of Oil Surface Engineering Design Documents" have been reviewed and approved and are now approved as oil and gas industry standards. The numbers and names of the standards are as follows:
Petroleum surface engineering design document preparation regulations (SY0009-93
SYI9-83)
Long distance oil tank gas pipeline measurement specifications (SYI2SY0055--03
55--3)
3SY 0072-93
Standard for high temperature cathode detachment test method of pipeline anti-detachment layer 4SY0071-93
Standard for test method of outer sheet material of pipeline anti-detachment layer 5SY0074-93
Standard for test method of insulation sealing of pipeline anti-detachment layer 6SY/T 0076-93 Design specification for natural gas dehydration 7SY/T 0077-93 Design specification for hot gas condensate recovery 8SY/T0523-93 Oilfield water treatment filter 9SY4024-93 stone construction project quality inspection and evaluation standard pass side (replace SYJn4024-88)
10 SY4025-93 Petroleum Construction Engineering Quantity Inspection and Assessment Standard Construction Engineering (Replace SYJn4025-88)
Petroleum Construction Engineering Quality Inspection and Assessment Standard Drill Rod Engineering 11SY4026-93
Engineering (Replace SYJ4028-88)
12SY4027-93
13SY4028-93
14SY4029-93
Petroleum Construction Engineering Quality Inspection and Assessment Standard Station Cabinet Quality Process Pipeline Installation Engineering (Replace SYJm402788)
Petroleum Construction Engineering Quality Inspection and Assessment Standard Equipment Installation Engineering (Agency SYJn402-88)
Petroleum Construction Engineering Quality Inspection and Assessment Standard Long-distance Pipeline Line Engineering (Replace SYJn Price 29-88)15 SY4030,1-93 Petroleum Construction Project Quality Inspection and Assessment Standard Electrical Engineering (Overhead Power Line Engineering) (Replaces SYJn403088)
16SY40302-99 Petroleum Construction Project Quality Inspection and Assessment Standard Electrical Engineering (Electrical Installation Engineering X Replaces SYJn40308)
17SY4031-93
18SY4033-93
19SY4034-93
20SY4035-93||tt ||Petroleum construction project quality inspection and assessment standard Automation instrument installation project (replace SYJn4031-88) Petroleum construction project quality inspection and assessment standard Road construction (replace SYJn4033-88)
Shizhou axis construction project quality inspection and assessment standard Analysis and assessment project (replace SYJn4034--88)
Petroleum construction project quality inspection and assessment standard, heating and ventilation, large installation project (replace SYJn403588)
Petroleum construction project quality inspection and assessment standard Refinery 21 SY4037-93
Construction Engineering (substitute SYJ4037--80)
22SY4038-93
Standard for Quality Inspection and Assessment of Petroleum Construction Engineering Gas Field Dynamic Engineering (substitute SY4038-92)
1 General
1.0.1 This test method is used to determine the relative insulation and sealing performance of joints, fittings and strong damage patching materials of anti-separation layer pipelines. These materials act as an insulating and anti-corrosion layer between the surface of the steel pipe and the surrounding soil.
1.0.2 This test method illustrates the insulation and sealing performance of the patching material by measuring the lubrication current, capacitance and loss tangent. 1.0.3 Test method for insulation and sealing of general anti-separation layer patching In addition to implementing this standard, the hospital shall also comply with the requirements of relevant national standards (specifications). 1.0.4 Reference standards
SY006 Non-destructive measurement method for thickness of pipeline protective layer (avoidance method)) SY 0063 (Test method for inspection and measurement of pipeline protective layer] 2 Method overview
2.0.1 In the test, the test piece is suspended in the electrolyte solution and connected to the negative pole of the 6V DC power supply to put it under positive protection. At the same time, an anode not in the electrolyte solution is connected to the positive pole of the power supply to form a test circuit. By regularly measuring the voltage drop generated by the calibrated resistor in the circuit to indicate the presence of leakage, the insulation sealing performance of the material can be determined. 2.0.2 If there is no voltage drop on the calibrated resistor, When measuring the capacitance and mechanical loss of the test piece, the capacitance and mechanical loss angle of the test piece need to be measured.
3 Significance and purpose
3.0.1 The performance of the patching material that acts as an anti-separation layer depends on the bonding ability of the patching material to the original anti-corrosion layer and the exposed metal, the integrity of the waterproof tape seal at the joint with the original anti-separation layer, and the water absorption of the patching material. 3.0.2 When a large leakage current flows through the joints, pipe fittings and damaged patching materials of the anti-separation layer pipeline, it indicates that the performance of the anti-separation layer material has been greatly reduced. Similarly, the capacitance and damage of the test piece The loss tangent is related to the water absorption of the patch material, so it is useful to measure the change in capacitance and loss tangent. When water enters the insulating layer, the capacitance increases. This process can be measured with a suitable resistance-capacitance bridge. 4 Instruments and Equipment
4.0.1 The test container should be non-conductive and its size should be such that (1) the suspended test piece does not touch the bottom and wall of the container, and there is no contact between the test pieces:
(2) the test piece is equidistant from the anode in the center: (3) the height of the container should be such that the lower part of the waterproof layer at the top of the test piece is completely The test specimen is placed in the electrolyte solution.
The container is generally a cylindrical glass cylinder with a diameter of 300mm and a height of 500mm. The cover of the container is made of inert material and is used to place the test specimen. There is a reference electrode entry hole on the cover of the container. The typical test device is shown in Figure 40.1! 4.0.2 The anode electrode is made of 1Cr18Ni9 stainless steel with a diameter of 10mm and a length of 609mm. The anode has a 0m section with a ripple. Other inert materials such as graphite, platinum, etc. can be used as the electrode.
4.0.5. The DC voltmeter has the following uses: (1) to measure the voltage on the 10002 electrode in the circuit to measure the size of the adjustment voltage, (2) to measure the potential of the test piece relative to the saturated copper/sulfuric acid steel reference electrode. The meter should have the following performance: 0.50μV and 0.10V
Precision: the full scale of each range is 3. Internal resistance: greater than 10MO in all ranges. 4.0.4 Instrument: should comply with the provisions of SY006% "Method for the non-excitation measurement of the thickness of the pipeline base layer (magnetic method)",
4.0.5 Ohmmeter: 500V megohmmeter
4.0.6 Reference electrode: saturated copper/sulfuric acid steel electrode, its potential relative to the standard fluorine electrode is -0.316V, and a saturated fluorine electrode can also be used, but the observed value must be added with -0.072V to convert it into a value relative to the saturated copper/sulfuric acid steel electrode. 4.0.7 DC regulated power supply: Generally, a drop battery is used to keep the direct voltage between each test piece and the saturated steel or acid steel electrode at 60±0.1V. When testing multiple test pieces, a suitable distribution board is required to control the voltage on each test piece individually. 4.0.8 Hand line: Use green soft screen control cable KVVPR-0.516X type. There should be a switch in the circuit that can disconnect each test piece from the power supply. A precision resistor of not less than 1W, 100021 should be inserted in the circuit from the cathode to the cathode. The connection of the test circuit is shown in Figure 4.0.8
4.09 Passenger bridge: A low-voltage cross-type circuit can be used. The circuit should have the following performance;
Reporting high frequency: 100H 25.
Electrical measurement range: 100PF to 100PF, accuracy ±1% or ±1PF, whichever is greater
100H-hour impedance angle measurement or use: 0.002 to 10, accuracy ±6% or ±0.001, whichever is greater,
4.0.10 Connecting parts: A small tubular insulating connector is used at the connection point of each test piece. It has two important functions: (1) When using RC, the test piece is disconnected from the power supply: (2) The test piece is disconnected from the test circuit to eliminate the error of parasitic capacitance caused by the length of the early line battery on the RC bridge circuit. 4.0.11 Device shielding: Cover the test device with thick aluminum foil or shiny steel mesh and connect it as shown in Figure 4.0.1.
5 Reagents and Materials
5.0.1 Electrolyte solution, prepared by tap water or 3% nitrided solvent. 5.0.2 Seal material for the end of the specimen: materials such as wax, cyclopentane resin, dielectric constant of 2-6, and low water absorption should be used. 6 Preparation of specimens
6.0.1 The specimen is a steel sheet that can represent industrial production, with a length of 376mm and an outer diameter of 460mm.
6.0.2 To make a simulated anti-separation layer patching specimen, a 100mm long section of anti-corrosion layer should be removed from 150mm below the upper end of the pipe, and a clean metal surface should be exposed, as shown in Figure 6, 2.
6.0.3 The lower end of the specimen is virtually covered with a narrow chamber, and it is flush with the lower surface of the specimen. The material in 5.0.2 is used to seal the belt. 6.0.4 The material of the test piece's patching, anti-separation layer structure, and process shall comply with the technical standards of the corresponding anti-friction layer materials. The test piece size is shown in Figure 6.0.2. 6.0.5 The 75mm section at the upper end of the test piece shall be made of the same material as the shrink seal cap as a waterproof layer, and its thickness shall be 3.2mm
7 Test steps
7.0.1 The test temperature shall be kept within the range of 10~27\C. 7.0.2 According to SY0066 "Non-destructive measurement method of thickness of anti-corrosion layer (magnetic method)", measure and record the average thickness of the original anti-corrosion layer exposed on both sides of the test piece and the average thickness of the shield layer attached to the patch. Www.bzxZ.net
7.0.3 According to Figure 4, 0.1, the patched test piece is twisted in the test container, and then the electrolyte is pushed into the container to make the liquid level reach the upper sliding width of the lower seal. 7.0.4 Connect one end of the test meter to the test piece, and the other end to the anode at the center. Connect the anode to the electrolyte. Measure the resistance between the test piece and the anode. The resistance should be kept above 1000M in 15 minutes. If it is lower than this value, it means that there is a problem with the end cover seal. The lower cabinet should be repaired before the test piece is immersed. 7.0.5 The test piece is immersed to the bottom of the waterproof layer at the top. During the entire acid test, tap water should be added to maintain this position. 7.0.6 The stainless steel anode at the center is connected to the positive terminal of the power supply. Each test piece is equipped with a 1000±1% (1W) sea battery, a switch, and then connected to the negative terminal of the power supply.
7.0.1 Connect the drop battery and a voltmeter between the test piece and the reference electrode. Measure the voltage of the test piece until the voltage between the test piece and the reference electrode is 6V (Figure 4.0.8).
7.0.8 Measure and record the voltage on each 1000 Ω electrode. 7.0.9 Measure and record the closed circuit potential E and open circuit potential Eo of each test piece relative to the saturated steel/magnetic acid pot electrode.
Standard: The closed circuit potential (E:) of any test piece decreases If the value is greater than the battery voltage (E:), it indicates that there may be obvious thinning current at the patch of the specimen. Similarly, if the open circuit voltage (L0) of any specimen is greater than 0.051, it also indicates that there is a conductive path at the patch. 1.0.10 Use the direct current in 4.0.3 to measure and record the battery terminal voltage Et
7.0.11 Measure once every 7 days as specified in 7.0.87.0.0, and calculate the specimen resistance according to the method selected in 8.0.1.
7.0.12 The capacitance and loss tangent value between each test piece and the central anode shall be measured every 7 days after the start of immersion until the highest value is read. 7.0.13 During measurement, the test piece shall be disconnected from the power supply, a capacitor shall be connected between the test piece and the anode, and the electrolyte shall be turned on to obtain the capacitance C and the root loss tangent value DF. 7.0.14 The test shall be carried out continuously for 180°, or until the capacitance of the test piece per cubic meter of the pool surface is 48009.
7.0.15 Before removing the test piece, check the test piece again to see if it is damaged. After removing the test piece, check it using the methods specified in Articles 7.0.3 and 7.0.4 of this standard. Check the sealing performance of the end sealing web:
8 Calculation
8.0.1 The formula for calculating the resistance of the test piece is as follows: R,1000A(E,-E.)/E,)
Wherein: R is the unit surface area resistance of the test piece, 2-m: A——the surface area of the test piece (excluding the increase), m(8.0.1)
E:—closed-circuit potential of the test piece (relative to saturated steel/sulfuric acid steel reference voltage) V (switch closed)
Eg-—open-circuit potential of the test piece (relative to saturated steel/sulfuric acid piano reference voltage), V (switch open),
E—voltage drop across the 10002 resistor, V (switch closed). 10
9 Report
9.0.1 The test report shall include the following contents:
9.0.1.1 A complete description of the test piece:
1. The name and thickness of the original anti-separation layer.
2. The name of the patch material, the structure of the anti-corrosion layer, the slow-down process (including the amount of edge pressing), and the average thickness of the anti-corrosion layer after slow-down.
3. The name, type and slow-down process of the bottom depth.
4. The start and end dates of the test and other relevant information. 9.0.1.2 Regularly record the following data:
1. The voltage on the 00 resistor E6
2. The mass potential E1 of the patch test piece
3. The open circuit potential Eon of the test piece
4. The battery terminal voltage E,
5. The calculated value of the resistance per unit immersion area of the test piece R: 6. The initial capacitance of the test piece.
7. The initial loss tangent value of the test piece. 9.0.1.3 Draw the semi-logarithmic curve of the resistance R of the test piece and time (d), the semi-logarithmic curve of the tangent value of the loss angle and time, and the rectangular curve of the capacitance C and time (d). 10. Precision
10.0.1 The precision data is limited to two test pieces cut from the anti-corrosion layer pipe produced in batches, and the metal surface pretreatment of the pipe, the anti-corrosion layer material and the coating process are all the same.
10.0.2 Repeatability: Under the same conditions, it meets the requirements of Section 10.0.1. The difference between the test results of two batches required by Article 1 should not exceed ±10% of their average value. 12. Type of economic support pin. Stainless steel period bottle. Test container. Connecting to the health center. Electric stimulation reduction surface. Figure 40. Test belt installation. Real solution. Good mouth. Can protect the TV from entering the hole. Brain screen condensation. Method. Preparation. By pressure. Poison. Electric medical meter. Q00060009. Price. Brain essence library. Voltage. Light. Electricity. Electricity. Electrical appliances and. Xinmin angle. Adjust the amount of direct. Illumination. Myoelectric. 000 0080
Figure 4.0.#Test circuit
Upper moisture-proof house
Original moisture-proof product
Inlet material
Original moisture-proof house termination area
Mould casting pipe head operation area
Doctor's garden paint
Lower weaving basin
Figure 6.0.2 Patching test specimen
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