5 Test methods 5.1 General If this product standard testing requirements and other standards provided reference is inconsistent, then the provisions of this standard take precedence. All products in the sample should be representative. 5.1.1 Sample 5.1.1.1 outer protective properties of the sample tube should be at room temperature (23 ℃ ± 2 ℃) at 16h after storage on an outer protective tube extraction; insulation, and insulation samples should be at room temperature, respectively (23 ℃ ± 2 ) ℃ after 72h stored on an outer protective tube extraction. 5.1.1.2 for the detection of insulation performance and insulation overall performance, the sample should be extracted at the ends of the tube with a thermal head, a sampling pitch insulation face should be greater than 500mm. 5.1.1.3 samples from the insulation foam insulation to detect structure (4.3.1), foam density (4.3.2), the pressure strength (4.3.3), water absorption (4.3.4) and thermal conductivity (4.3.5 When), shall be removed close to the pipe and the outer jacket of foam leather, clear layer thickness of 5mm and should be separately 3mm. At least three samples required for each test item, the sample should be evenly distributed on the same section of the annular insulation layer. Dimensions of the sample according to GB / T 6342 Determination. Measurement accuracy 0.02mm. 5.3 outer protection tube 5.2.1 Density Density test shall GB / T 1033 execution. 5.2.2 Carbon black dispersion of the carbon black dispersion of plastic sections shall observe under a microscope to determine. Slice thickness of about 25μm, an area of ??about 15mm2. 6 slices each test preparation, outer protective tube with a length in the sample by the uniform. Microscope magnification should be used 100 times. 5.2.3 Carbon black content of carbon black content of the test should be GB / T 13021 execution. 5.2.4 Melt Flow Rate The melt flow rate test should be GB / T 3682-1983 Test Condition 4 execution. 5.2.5 outer appearance of the inner and outer surfaces of the protective tube without amplification visual (see 4.2.3.3). 5.2.6 tensile yield strength and elongation at break tensile yield strength and elongation at break test shall GB / T 8804.2 execution. 5.2.7 Longitudinal reversion rate of longitudinal reversion test shall GB / T 6671.2 execution. Long-term mechanical properties of the sample 5.2.8 outer protective tube in Figure 2 (a little) and 6 (slightly) mechanism into the surface. At constant temperature 80 ℃ ± 1 ℃, 1.0MPa ± 0.04MPa under constant tension immersed in an aqueous solution containing 2.0% test surfactant. Surfactant nonylphenol polyethylene glycol ether or sec-octyl polyvinyl ether [TX-10]; coping solution stirred continuously to ensure that a uniform solution to prevent precipitation of the surfactant; cut six samples should be tested, Sample guard along the tube axis direction I cut, sampling locations should be evenly distributed in the same section; recording failure time, time accurate to ± 12h; calculate the geometric mean of 6 samples, the deviation exceeds twice the standard deviation of the test data It should be deleted. If the test samples were not destroyed 1500h, the test can be stopped, and the sample is determined to meet the requirements. 5.2.9 outer protective tube outer jacket pipe size detector size should be GB / T 8806 execution. 5.3 5.3.1 Test Method rigid foam cell size cell size detection should be GB / T 12811 execution. Insulation center in the radial sampling sample length of at least 20mm. 5.3.2 closed cell foam closed cell foam rate detection rate should be GB / T 10799 execution. And there may be different with a sample size of GB / T 10799 stipulated. If you can not cut out to meet the press 5.1.1.3 sample size requirements from the insulation layer, the size can be 25 × 25 × t (mm), where t is the maximum allowable radial thickness of the insulation layer. 5.3.3 insulation hollow cross section, measuring the percentage of air bubbles from the outer protective tube may end 1.5m, cut 5 formed four ring knife cuts (including public annular outer jacket pipe cut and foam insulation), each annular cut length 100mm. Requirements flat section intact, and section perpendicular to the axis of insulation. Su order ripping four 100mm long ring cuts, exposed insulation ring section, measured on the annular hollow section and bubble size. Larger than 6mm voids and bubbles (measured in any direction on the plane), its size should be measured in two mutually perpendicular directions, the product definition of these two dimensions of voids or bubbles area. Less than 6mm voids or bubbles in the area. All the measured area of ??voids and bubbles and accounted for insulation cut percentage of the surface area as a measurement result. 5.3.4 foam density foam density test should be GB / T 6343 execution. 5.1.1.3 foam removed from the center by 3 samples (including voids, bubbles discard samples), each of the magnetic sample size: 30 × 30 × t (mm), t is the maximum allowable radial insulation thickness, but should not exceed 30mm. The same sample can be taken into 30mm long cylinder (in the axial direction), diameter d, d is the maximum allowable size radial insulation layer, but not more than 30mm. 5.3.5 compressive strength compressive strength test should be GB / T 8813 execution. Sample of 30 × 30 × t (mm) cubes or diameter 30mm, height t of the cylinder, t is the maximum allowable size of a radial insulation layer, but not less than 20mm. 5.3.6 Water absorption 5.3.6.1 instrument balance, a sense of the amount of 0.01g; oven; dryer; soaking tub, open container or pond. 5.3.6.2 Sample Sample size: 25mm × 25mm × 25mm cube or diameter 30mm, height 25mm cylinder. Polished specimen surface with fine sand. N = number of samples to three. 5.3.6.3 Sample treatment a) to try the sample into oven 50 ℃ ± 3 ℃ dried 24h; b) removing a sample cooled to room temperature in a desiccator, weighed to the nearest 0.01g; c) The specimen back into the oven 4h, out into the dryer to cool to room temperature (23 ℃ ± 2 ℃), weighed to the nearest 0.01g; d) The above results were weighed twice compared, When the value is less than the difference between the two weighing 0.02g, the sample can be considered a constant weight, whichever is the latter weighing value as a sample mass (m0). When weighing the difference between the two values ??of 0.02g earth shall c) are repeated until a constant weight requirements. 5.6.3.4 Test step of measuring the sample linear dimensions, accurate to 0.02mm. Sample volume (V0) is calculated, accurate to 0.01cm3. The specimen soak tub with a net pressed specimen. Fresh distilled water poured into the soaking tub cents, the water level should be above the upper surface of the specimen 50mm (must make full contact with water sample should be kept a distance from time to time between the two samples can not touch each other). Short brush to remove air bubbles on the sample. The sample was immersed in distilled water was heated in boiling water 1atm 90min, and then immediately immersed in a 23 ℃ ± 2 ℃ water 1h, remove the sample, gently with filter paper to absorb surface water, immediately weighed (m1), accurate to 0.01g. According to equation (1) Calculate the water absorption, rounding off to three significant digits. η0 = × 100% Where: η0-- sample absorption; m0-- sample before absorbing quality, g; m1-- sample after absorbing quality, g; V0-- original sample volume, cm3; P- - distilled water density, g / cm3. 5.3.7 thermal coefficient of thermal conductivity measurement should be GB / T 10297 execution. 5.4 5.4.1 Test Method for insulation outer jacket tube diameter by measuring the rate of increase in the same position in the outer jacket pipe around the perimeter of the foam, calculate the percentage increase in diameter accounted original diameter. The outer diameter growth rate = × 100% Where: OD D1-- after foaming; outer diameter D0-- before foaming; 5.4.2 5.4.2.1 Life expectancy Life expectancy tests can be performed pipe insulation aging test, calculated life Appendix A (informative annex). 5.4.2.2 insulation medium temperature aging test for continuous operating temperature) is higher than 110 ℃ insulation system in measuring the axial shear strength pipe insulation, pipe insulation to deal with the aging process samples were as follows: nominal pipe diameter DN> 500, insulation aging sample length should be 3m; when nominal pipe diameter DN≤500, insulation aging sample length should be 2m; the aging process: an outer protective tube should be exposed to room temperature for 23 ℃ ± 2 ℃ state, steel It should be kept at a high temperature. Aging conditions are shown in Table 7 (omitted). Pipe heating rate: When the temperature is less than 100 ℃, was 25 ℃ / h; when the temperature is higher than 100 ℃, was 50 ℃ / h; steel temperature shall be recorded continuously during aging, temperature deviation ± 0.5 ℃; after aging test like natural cooling to room temperature 23 ℃ ± 2 ℃ state. Shear strength 5.4.3.1 Test Method after aging pipe insulation 5.4.3 Sampling: In compliance with the provisions of 5.4.2.2 and silence insulation test specimens. Specimens shall be made at the tube ends at a distance of at least 1000mm, and its length is 2.5 times the thickness of the insulation layer, but not less than 200mm. Samples taken should be perpendicular to the end face of the insulation to the tube axis. The testing process: test carried out on the test machine, the sample in Figure 3 (a little) axial force is applied to steel pipes placed end to take the test machine speed 5mm / min, until the destruction of the sample. Record the maximum axial force and calculates the axial shear strength. Test samples can be placed under the horizontal axis or vertical direction Kennedy two cases. When placed in the vertical axis prong test, the quality of steel should be considered. The average of three samples of the test results as the test result. Shear strength formula: τax = Fax / L × d × π .............................. (3) Where: τax-- axial shear strength, MPa; d-- pipe diameter, mm ; Fax-- axis bribe force, N (including steel mass heel); L-- sample length, mm. 5.4.3.2 ogle at room temperature axial shear strength test according to 5.4.3.1. All samples kept at room temperature (23 ℃ ± 2 ℃) state. 5.4.3.3 axial shear strength under high temperature conditions by 23 ℃ ± 2 ℃ state 5.4.3.1 tested. During the test, it should be exposed to external expansion tube at room temperature (23 ℃ ± 2 ℃) state, the steel temperature should be controlled at 140 ℃ ± 2 ℃. Pipe heating rate: When the temperature is less than 100 ℃, was 25 ℃ / h; when the temperature is higher than 100 ℃, was 50 ℃ / h. Constant axial force is applied to the test after 30min. 5.4.4 Impact of the sample on the holding of interception, the sample length should be five times the outer diameter of the outer jacket tube, but should not be greater than 1.5m. The test shall be executed GBT 14152. Take the test temperature 20 ℃, drop hammer quality take 3.0kg, drop height 2000mm. Draw equidistant marked seal on the sample pipe insulation, according GB / T 14152-1993 Table 1 (omitted) determine the number of equidistant markings. Before the test, the sample is placed in -20 ℃ ± 1 ℃ environment 3h, was removed from the holding facility within the sample 10s start test, the test should be completed as quickly as possible. 6 Inspection rules according to GB / T 2828 enactment of this rule. 6.1 Batch same material, the same formula, the same size in the same conditions as the production of insulation tubes, each batch number no more than 50. 6.2 sampling program 6.2.1 Option One: acceptable quality level AQL = 6.5, general inspection level Ⅱ. Batch number, number of units have case take samples to determine the number shown in Table 8 (omitted). 6.2.2 Option Two: acceptable quality level AQL = 4.0, the special inspection level S-3. Batch number, number of units and take samples to determine the number of qualified Table 9 (omitted). 6.2.3 Test items, sampling programs can also be both parties agree. 6.3 6.3.1 factory inspection density outer jacket pipe insulation, tensile yield strength, elongation at break, heat tube diameter increased rate of testing in accordance with the relevant provisions 4.2.2.1,4.2.3.4,4.4.2. Batch acceptance number shown in Table 8 (omitted). 6.3.2 insulation insulation density, size deviation insulation axial eccentricity insulation resistance test by 4.3.2,4.4.1,4.4.3,4.4.6 relevant requirements. Batch acceptance number shown in Table 9 (omitted). 6.4 6.4.1 Type test if one of the following conditions should be type tested. - When the organ product trial shape identification or old products plant; - after the official production, such as structure, materials, technology and other larger changes that may affect product performance; - product discontinued after one year, the factory inspection results are quite different with the last type inspection; - -; when to resume production national quality supervision bodies type inspection requirements; - Normal production, every two or cumulative production reached 300km (press extend meters), type of inspection should be carried out periodically. 6.4.2 The type test according to the provisions of Chapter 4, all items tested. 6.5 Determination rules 6.5.1 samples tested positive sample does not exceed the number of units failed Table 8 (abbreviated) Table 9 (abbreviated) specified in lot quality acceptance number, it is determined to deliver batches of qualified; over batch quality standards When determining the number, it is determined to deliver batches failed. Batch quality determination. As a result of the re-inspection in accordance with the final judgment. 6.5.2 without removing substandard batches of unqualified goods, shall submit test again. Reinspection shall (omitted) Table 9 (slightly) in the number of units and take samples of batch quality determination. As a result of the re-inspection in accordance with the final judgment. 7 signs, transportation, storage 7.1 is available for any sign of damage to insulation outer protective tube performance of a flag, the flag should withstand transport, storage and use of the environment. 7.1.1 outer protective tube outer sheath tube producer shall mark on the outer protective tube as follows: - the outer jacket pipe raw commodity name and code; - melt flow rate (MER) value; - the outer protective tube outer diameter and thickness; - the date of manufacture; - vendor logo. 7.1.2 pipe insulation pipe insulation producer shall outer sheath tube marked as follows: - pipe diameter and wall thickness; - specifications and grades of steel; - producer signs; - the standard product code; - foaming date or production lot. 7.2 transportation insulation must not harm the tape or other insulation Hoisting prohibited direct lifting wire rope; during loading and unloading, non-collision, tossing rolling drag on the ground. Long-distance transport, insulation must be securely. Should not damage the outer protective tube and insulation and layers. 7.3 Storage 7.3.1 insulation disposal site shall meet the following requirements: - The ground should be flat, no rocks and other hard debris; - the ground should have enough carrying capacity to ensure that no incidents occur collapse and dumped after stacking; - stacking site should be dug drains, water is not allowed inside the venue; - disposal site should be set pipe bracket, pipe supports should ensure that the outer insulation of the lower surface of the protective tube above the ground 150mm. Sling Su insulation must not harm the insulation and other methods Bin lifting, non-direct lifting wire rope; during loading and unloading, non-collision, tossing and rolling drag on the ground. Long-distance transport, insulation must be securely. Should not damage the outer jacket pipe and insulation. 7.3.2 insulation stack height should not exceed 2.0m. 7.3.3 insulation shall be subjected to sun exposure, rain and soaked tarpaulin cover when open storage is appropriate. Dumps away from heat and sources of ignition.