This test is applicable to the determination of the resistance of the pipeline anticorrosion layer to needle penetration or deformation under the action of the specified blunt rod pressure. This test is applicable to various non-metallic anticorrosion layers of pipelines under different temperature conditions. SY/T 0062-2000 Test method for needle penetration of pipeline anticorrosion layer (blunt rod method) SY/T0062-2000 Standard download decompression password: www.bzxz.net
This test is applicable to the determination of the resistance of the pipeline anticorrosion layer to needle penetration or deformation under the action of the specified blunt rod pressure. This test is applicable to various non-metallic anticorrosion layers of pipelines under different temperature conditions.

1 Scope
Petroleum and Natural Gas Industry Standard of the People's Republic of China Pipeline Anticorrosion Layer Penetration Test Method
(Blunt Rod Method)
Approval Department: State Administration of Petroleum and Chemical Industry Date of Approval: 2000-12-25
Implementation Date: 2001-06-01
SY/T 0062-—2000
Replaces SY/T0062
2—1992
1.1 This test is applicable to the determination of the resistance of pipeline anticorrosion layer to penetration or deformation under the action of the specified loading blunt rod pressure. 1.2 This test is applicable to various non-metallic anticorrosion layers of pipelines under different temperature conditions. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest version of the following standards. SY/T0066—1999 Non-destructive measurement method for thickness of anti-corrosion layer of steel pipe (magnetic method) 3 Principle
3.1 This method uses a loaded blunt rod to press on the anti-corrosion layer of the specimen, and uses a depth gauge to measure the depth of the blunt rod's penetration. When the same reading is obtained three times in a row within the specified time interval, the test can be terminated. 3.2 The anti-corrosion layer of the buried pipeline must withstand the concentrated pressure generated by the weight of the pipeline itself and the backfill soil. This test is used to evaluate the resistance of the anti-corrosion layer to penetration or deformation under specified conditions. 3.3 The anti-corrosion layer is deformed under pressure but not penetrated, which does not mean that the deformation is a hidden danger of the anti-corrosion layer under buried conditions. The deformation of the anti-corrosion layer cannot be compared with the penetration of the anti-corrosion layer. 4 Equipment and instruments
4.1 The needle penetration test equipment shall comply with the following provisions. The equipment diagram is shown in Appendix A (Appendix to the standard). 4.1.1 The diameter of the blunt rod end is 6.350mm ± 0.025mm, and the total mass of the blunt rod, the weight and other loading parts is 4.453kg. When the end of the blunt rod is pressed against the anti-corrosion layer of the specimen, a pressure of 1.379MPa is generated. 4.1.2 The blunt rod should move vertically in the guide tube without any obstruction. 4.1.3 After the specimen is fixed, its axis intersects with the axis of the blunt rod vertically. 4.2 Depth gauge: It can measure the displacement of the blunt rod with an accuracy of 0.01mm. 4.3 Magnetic thickness gauge: It should be selected according to the relevant provisions in SY/T0066. 4.4 Constant temperature box: It can keep the temperature within the required test temperature ± 2°C. 4.5 Thermometer: The accuracy is ± 0.5°C.
5 Test piece
The test piece is a steel pipe with a length of 150mm and a nominal diameter of 50mm. The pretreatment of the metal surface and the coating process of the anti-corrosion layer should be the same as those of the industrially produced anti-corrosion layer pipe.
6 Test steps
SY/T0062—2000
6.1 The test should be carried out in a constant temperature box (see 4.4). The test temperature is generally 23~75℃ or other specified temperatures. If the test temperature requirements can be met without a constant temperature box, the constant temperature box may not be used. 6.2 The test piece should be placed at the test temperature for 24h before the test. 6.3 Before the test, it is necessary to check whether the needle penetration test equipment (see 4.1) is placed horizontally to ensure that the blunt rod is in a vertical state, and the shaft ring is loosened so that the code and the shaft ring are placed on the blunt rod guide cylinder. At this time, the blunt rod is not loaded. 6.4 Use a magnetic thickness gauge (see 4.3) to measure the thickness T of the anti-corrosion layer at the measuring point of the test piece. Place the specimen in the needle penetration test equipment, adjust the measuring point position so that the blunt rod is aligned with the measuring point, fix the specimen with the fastening screw, and use the depth gauge (see 4.2) to read the initial measurement value Mi of the blunt rod needle penetration.
6.5 Lift the code and the shaft ring, and tighten the fastening screw on the shaft ring to load the blunt rod. 6.6 Measure the blunt rod needle penetration with the depth gauge every 24 hours. When the reading remains unchanged for three consecutive times, the value is the final measurement value MF. 6.7 Observe and record the surface conditions at the measuring point of the specimen. 6.8 At least three points should be taken on the same specimen for repeated testing. 7 Calculation of the absolute change value Cn and relative change rate Cp of
needle penetration The calculation formulas are shown in formulas (1) and (2). Cn=IMr-M1
Cp =(Cn/T)×100%
Wherein: Cn absolute change value (mm),
Mr—final measurement value (mm);
Mr—initial measurement value (mm),
relative change rate;
T—anticorrosive layer thickness (mm).
8 Test report
(2)
The report should include the following contents.
8.1 A complete description of the test piece, including the specifications and dimensions of the pipe, the name and technical standard number of the anticorrosive layer, the manufacturer, the production date, the production batch number and other relevant information.
8.2 The anticorrosive layer thickness at the test piece measuring point. 8.3 Test temperature.
8.4 Initial and final measurement values ​​of the penetration. 8.5 Changes in the surface state at the test piece measuring point caused by loading the blunt rod. 8.6 Absolute change value and relative change rate of needle penetration. 8.7 Time required to produce the absolute change value (hours or days). 9 Precision
9.1 The calculation of data precision is taken from two adjacent test pieces on the same pipe with the same pipe surface conditions, anti-corrosion layer materials and production process.
9.2 Repeatability: The allowable deviation of the absolute change value is ±0.015mm or the relative change rate is within 5%. 9.3 Reproducibility: The allowable deviation of the absolute change value obtained by the two laboratories is ±5%. 877
SY/T 0062—2000
A1 See Figure A1 for the needle penetration test equipment.
Appendix A
(Standard Appendix)
Structural Diagram of Penetration Test Equipment
1—Base Plate (1 piece); 2—V-type Seat (2 pieces); 3—Pin Plate (1 piece); 4—Butterfly Screw (2 pieces); 5—Spacer (2 pieces); 6—Side Beam (2 pieces); 7—Lower Cross Beam (1 piece); 8—Guide Cylinder (1 piece, Brass); 9—Vertical Column (2 pieces); 10—Upper Cross Beam (1 piece); 11—Butterfly Nut M10 (2 pieces); 12—Depth Gauge, 13—Code (1 piece, brass); 14-shaft collar (1 piece, stainless steel); 15--fastening screw M8×6 (1 piece, stainless steel); 16-blunt rod (1 piece, stainless steel); 17-hexagon socket screw M8×40 (2 pieces); 18-hexagon socket screw M8×20 (4 pieces); 19-hexagon socket screw M8×40 (4 pieces); 20-bar (diameter 50mm); 21-washer (1 piece, rubber); 22-splint (1 piece); 23-countersunk screw (4 pieces) All parts whose material is not specified are made of ordinary carbon steel. Figure A1 Needle penetration test equipment-1
Base parts see Figure A2
4—every 10.8
/countersink 21×90°
(a) Bottom plate
Countersink 13 depth 8
Zhong'an Guo
(c) Side beam
Figure A2 Base parts
/2-M8 depth 16
Hole depth 19
SY/T 0062--2000
2-M10 depth 19
Hole depth 22
V-shaped seat
(d) Pad
SY/T 0062--2000
Bracket parts see Figure A3.
(a) Upper crossbeam
(c) Lower crossbeam
Figure A3 Bracket parts
1.6×45°
p9. 5 8:8
(b) Guide cylinder
0. 8×45°4
(d) Column
Loading parts See Figure A4.
(a) Code
46.35-0:8284
(b) Blunt rod
Loading parts
SY/T 0062--2000
(c) Shaft collar
SY/T0062--2000
Clamp, washer, butterfly screw See Figure A5. A5
13×90 in countersunk hole
（a）Clamp
（c）Gasket
Figure A5 Clamp, gasket, butterfly screw
(b) Clampwww.bzxz.net
（d) Butterfly screw
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