QB/T 2479-2000 Chlorinated polyvinyl chloride (PVC-C) casing for buried high-voltage power cable QB/T2479-2000 Standard download decompression password: www.bzxz.net

QB/T2479—2000
Chlorinated polyvinyl chloride (PVC-C) casing for buried high-voltage power cables is widely used in urban municipal construction and is an essential supporting product for cable burial:
This standard is an industry standard compiled based on the requirements of the power system for chlorinated polyvinyl chloride casing for buried high-voltage power cables, with reference to the technical parameters and relevant information of similar foreign products. This standard is proposed by the Industry Management Department of the State Bureau of Light Industry and is under the jurisdiction of the National Plastic Products Standardization Center. The drafting unit of this standard: Shanghai Tomson Plastic Industry Co., Ltd. The main drafters of this standard: Zhou Zhongliang, Xiao Xianghua, Xu Zhenggui. 190
Light Industry Standard of the People's Republic of China
Chlorinated polyvinyl chloride (PVC-C) casing for buried high-voltage power cables
QB/T 2479--2000
This standard specifies the classification, requirements, test methods, inspection rules and marking, packaging, transportation and storage of chlorinated polyvinyl chloride casing (hereinafter referred to as "casing") for buried high-voltage power cables. This standard is applicable to casings made of nitrided polyvinyl chloride resin as the main raw material, with necessary additives added, and extruded. The casing is suitable for protecting high-voltage and extra-high-voltage power cables buried underground. Referenced 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 versions of the following standards. GB/T 1033—1986
GB/T 1410—1989
CB/T 2828—1987
GB/T 2918—1998
GB/T 3960—1989
GB/T 6112—1985
GB/T 8802—1988
GB/T 8805—1988
GB/T 88061988
3 Product specifications
Test methods for density and relative density of plastics
Test methods for volume resistivity and surface resistivity of solid insulating materialsBatch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches)Standard environment for conditioning and testing of plastic specimensTest methods for sliding friction and wear of plastics
Determination method for impact resistance of thermoplastic pipes and fittings (drop hammer method)Determination method for Vicat softening temperature of rigid polyvinyl chloride (PVC-U) pipes and fittingsMeasurement method for bending of rigid plastic pipes
Measurement method for plastic pipe dimensionsbZxz.net
The specifications of casing are expressed by D (nominal outer diameter) × e (wall thickness), see Figure 1 and Table 1. Table 1 Specifications, dimensions and deviations
Nominal outer diameter D.
Average outer diameter
Basic dimensions
Note: Other specifications can be produced according to user requirements. Approved by the State Bureau of Light Industry on June 13, 2000
Allowable deviation
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Basic size
Allowable deviation
2000-10-01Implementation
3.2 The casing is connected by elastic sealing ring. 4 Requirements
4.1 Color
Generally orange-red.
4.2 Appearance
QB/T 2479—2000
Figure 1 Nominal outer diameter and wall thickness of casing
The inner and outer walls of the casing should be smooth and flat, and no bubbles, cracks, obvious marks, depressions or decomposition discoloration lines are allowed. The end face of the casing should be cut flat and perpendicular to the axis.
4.3 Length
The length of the casing is generally 4m, 6m. It can also be agreed upon by both the supply and demand parties. The maximum deviation of length is 0.4% to 0.2% of the length. 4.4 Specifications, dimensions and deviations shall comply with the provisions of Table 1. 4.5 Curvature
Curvature shall not exceed 1.0%.
6 Physical and mechanical properties shall comply with the provisions of Table 2. 4.6
Table 2 Physical and mechanical properties
Vicat softening temperature
Hot compression force of ring
Friction coefficient
Volume resistivity
Drop hammer impact test
≤7.0 mm
≥8.5 mm
1350~1500
≥1. 0×1013
9/10Pass
Test method
5 Test method
5.1 Sample pretreatment
QB/T 2479—2000
Unless otherwise specified, the test shall be conducted in accordance with GB/T2918, with a temperature of (23±2)℃ and a relative humidity of (50±10)%, for not less than 4h, and under the same conditions.
5.2 Appearance
National visual inspection, the interior can be illuminated by light. 5.3 Length
Measured with a steel tape measure with an accuracy of 1mm.
5.4 Dimension measurement
5.4.1 Average outer diameter and allowable deviation
Measure the average outer diameter in accordance with GB/T8806, and calculate the average outer diameter deviation. 5.4.2 Wall thickness and allowable deviation
Measured in accordance with GB/T8806.
5.5 Curvature
Measured in accordance with GB/T8805.
5.6 Physical properties
5.6.1 Density
Measured by A method in accordance with GB/T1033. 5.6.2 Vicat softening temperature
Measured in accordance with GB/T8802.
5.6.3 Ring heat compression force
Take 300mm pipe sections from each of the three sleeves as the sample. The two ends of the sample should be cut vertically and placed in an electric hot air drying oven. After being treated at (80±2)℃ for 1 hour, take out the sample from the drying oven and immediately place it flat between the two pressing plates of the compression testing machine. Compress the sample at a speed of (5±2)mm/min. The force when the outer diameter is compressed by 2.5% is the ring compression force. Each section of the sample should be completed within 2 minutes from the time it is taken out of the drying oven to the completion of compression. The arithmetic mean of the test results of the three samples is taken as the test result. 5.6.4 Friction coefficient
Measured in accordance with GB/T3960.
5.6.5 Volume resistivity
Measured in accordance with GB/T1410.
5.6.6 Drop hammer impact test
Tested according to GB/T6112, test temperature (23±2)℃, impact hammer head diameter 25mm, test conditions see Table 3. Table 3 Impact test conditions
Size/(mm×mm)
Drop hammer mass/kg
0.50±0.01
1.00±0.01
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Drop height/mm
2000±10
6 Inspection rules
QB/T2479—2000
6.1 Products must be inspected and qualified by the quality inspection department of the manufacturer and attached with a certificate before they can leave the factory. 6.2 Batch
The same specification casing produced under the same batch of raw materials, the same formula and process conditions is a batch, and the quantity of each batch shall not exceed 10,000 pieces. If the production quantity is small and the production period of 5 days is less than 10,000 pieces, the 5-day output shall be considered as a batch. The batch number shall be indicated upon delivery. 6.3 Factory inspection
6.3.1 The factory inspection items are the Vicat softening temperature and drop hammer impact test specified in 4.1~4.5 and 4.6. 6.3.24.1~~4.5 According to Table 4, the normal inspection sampling plan shall be carried out according to GB/T2828, and the general inspection level shall be 1, and the qualified quality level shall be AQI.26.5. It can also be inspected according to the agreement between the two parties to the contract. Table 4 Sampling plan
Batch range N
151 ~~280
281500
501~1 200
1 201 -3 200
3201~10000
Sample size n
Qualified judgment number A.
Unqualified judgment number R.
6.3.3 After the counting sampling samples meet the requirements of 4.1~~4.5, sufficient samples are selected from them to carry out the Vicat softening temperature and drop hammer impact test specified in 4.6.
6.4 Type inspection
Type inspection items are all required items. According to the requirements of this standard and the provisions of 6.3.2, 4.1~4.5 shall be inspected, and sufficient samples are randomly selected from the qualified samples for 4.6. Generally, the inspection is conducted once a year. If any of the following situations occurs, type inspection should also be conducted. a) Trial and determination of new products or old products for transfer to factory production; b) When there are major changes in structure, materials, and processes that may affect product performance; c) When the product is resumed after a long period of suspension; d) When there is a significant difference between the factory inspection result and the last type inspection; c) When the national quality supervision agency proposes a type inspection requirement. 6.5 Judgment rules
If any one of items 4.1~~4.5 does not meet the requirements of Table 4, the batch is judged to be unqualified. If one of 4.6 does not meet the indicators, double samples are randomly selected for re-inspection of the item. If there are still unqualified results, the batch is judged to be unqualified; if qualified, the batch is judged to be qualified.
Marking, packaging, transportation, storage
7.1 Marking
QB/T2479—2000
The casing should be marked with the product name, specification, standard number, manufacturer name, trademark and production date. 7.2 Packaging
The casing has a film jacket, and the manufacturer name and address can be printed on the film. If the user has other requirements, they can be negotiated. 7.3 Transportation
The casing must not be exposed to the sun during transportation, and must not be subjected to severe impact, throwing and heavy pressure. 7.4 Storage
The casing should be stacked reasonably and away from heat sources. The stacking height should not exceed 1.5m, and the flared parts should be placed crosswise to avoid extrusion and deformation. When stacked in the open air, it must be covered to prevent exposure. The storage period shall not exceed 18 months from the date of production. 495
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