SY/T 0067-1999 Test method for impact resistance of pipeline anti-corrosion coating (limestone drop method)

This standard specifies the experimental method for testing the relative impact resistance of pipeline anticorrosion coatings caused by limestone falling. This standard is applicable to observing the impact of limestone falling on pipeline specimens with anticorrosion coatings to determine the relative impact resistance of pipeline anticorrosion coatings and to provide a feasible method for screening pipeline anticorrosion coatings with good impact resistance. SY/T 0067-1999 Test method for impact resistance of pipeline anticorrosion coatings (limestone falling method) SY/T0067-1999 Standard download decompression password: www.bzxz.net

1 Scope
Standard of the People's Republic of China for the petroleum and natural gas industryTest method for impact resistance of pipeline anticorrosion coating
(Limestone drop method)
Approval department: State Administration of Petroleum and Chemical IndustryApproval date: 1999-05-17
Implementation date: 1999-12-01
This standard specifies the test method for detecting the relative impact resistance of pipeline anticorrosion coating caused by limestone drop. SY/T 0067—1999
Replaces SY00671992
This standard is applicable to observing the effect of limestone drop on pipeline specimens with anticorrosion coating to determine the relative impact resistance of pipeline anticorrosion coating, and provides a feasible method for screening pipeline anticorrosion coating with good impact resistance. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB/T14685—1993 Pebbles and crushed stones for construction SY/T0063--1999 Test method for leak detection of pipeline anticorrosion layer SY/T 0066---1999
Non-destructive measurement method for thickness of steel pipe anticorrosion layer (magnetic method) 3 Method overview
This method uses limestone of certain specifications and quality to fall onto the anticorrosion layer of the pipeline specimen through a chute, and uses visual inspection and anticorrosion layer leak detector to find the number of limestone falls required for the anticorrosion layer to be penetrated, so as to determine the relative impact resistance of the pipeline anticorrosion layer. 4 Significance and use
The purpose of this test method is to simulate the impact of backfilling operation on the anticorrosion layer of the pipeline laid in the trench by using the limestone falling method, and to evaluate the relative impact resistance of the anticorrosion layer so as to take corresponding protective measures. 5 Equipment and instruments
5.1 Impact test equipment: including the following items. 5.1.1 The box with chute, as shown in Figure 1, allows limestone to fall freely from a height of about 1.83m onto the pipe specimen. 5.1.2 The box and chute shown in Figure 1 are designed for testing anti-corrosion pipe specimens with a diameter of 100~150mm. If a pipe specimen with a smaller diameter is used, a √-shaped wooden block can be inserted into the box under the chute to fix it. 5.2 Stone: Hard, coarse-grained limestone aggregate is used in the test. The sieve for screening limestone should comply with the provisions for sieves in GB/T14685. The gradation of limestone should comply with the following provisions. Square mesh size (mm)
Mass fraction passing through the sieve (%)
95～100
20~～50
0～10
5.3 Material barrel: A barrel that can hold 16kg of limestone. 5.4 Magnetic thickness gauge: should comply with the relevant provisions of SY/T0066. 5.5 Anti-corrosion layer leak detector: should comply with the relevant provisions of SY/T0063. 8o0
Figure 1 Box with chute
6 Test piece
SY/T0067--1999
Skate mouth cross-section diagram
The test piece should be able to reflect the representative anti-corrosion layer pipe section produced by industrial production and coating methods, with a diameter of no more than 150mm and a length of 600mm. The test pipe section should be free of defects. 7 Test steps
7.1 The test is carried out at room temperature of 21~～25℃. 7.2 Use a magnetic thickness gauge to measure the thickness of the test piece's anti-corrosion layer. 7.3 Weigh 16kg±0.2kg limestone, the gradation of which should comply with the provisions of 5.2. Mix evenly and put it into the material barrel. 7.4 Measure and record the temperature of the test piece at the beginning of the test. 7.5 Place the test piece in the box under the chute, place the baffle at the top of the chute horizontally on the chute opening, and fix it with a clamp. Lift the barrel, load 16kg of limestone into the space formed by the bell mouth and the baffle at the top of the box, and distribute it evenly. Open the clamp that fixes the baffle, the baffle tilts forward, and the limestone falls freely. 7.6 Take out the test piece and check whether there are defects on the impacted side of the test piece's anti-corrosion layer. First use visual inspection. If no cracks are found, check with an anti-corrosion layer leak detector. If no defects in the anti-corrosion layer are found by either method, the test should be repeated until the defects are found. When repeated impacts, the same side of the test piece should be impacted. Record the number of times the limestone falls when defects occur. The same batch of limestone should be replaced after 5 uses. After the test, measure and record the temperature of the test piece. 899wwW.bzxz.Net
SY/T0067-1999
If no defects in the anti-corrosion layer are found after 10 drops of limestone, the test is terminated. Test report
A complete description of the test piece, including: name and code of the anti-corrosion layer, nominal diameter of the steel pipe, thickness of the anti-corrosion layer, source of the test piece, production date and product batch number.
8.2 Approximate temperature of the pipe at the beginning and end of the test. 3 The number of limestone drops and the number of defects produced when the anti-corrosion layer defects first occur. If there are many defects in the anti-corrosion layer, the report should note 8.3
that there are many defects.
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