This standard specifies the technical requirements and inspection methods for coreless gravity heat pipe aluminum tubes. This standard applies to the production and acceptance of coreless gravity heat pipe aluminum tubes. GB/T 9082.1-1988 Coreless gravity heat pipe aluminum tubes GB/T9082.1-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Aluminium tubes used for wickless gravity heat pipes
Subject content and scope of application
This standard specifies the technical requirements and inspection methods for wickless gravity heat pipe aluminium tubes. This standard applies to the production and acceptance of wickless gravity heat pipe aluminium tubes. Reference standards
GB 241
Metal pipe hydraulic test method
GB 3199
Packaging, marking, transportation and storage of aluminum and aluminum alloy processed productsGB4436
Lead and aluminum alloy pipe size and allowable deviationGB4437 Aluminum and aluminum alloy hot extrusion pipe
3 Variety specificationsbzxZ.net
3.1 Variety specifications of round pipes
3.1.1 The outer dimensions of round pipes are shown in Table 1. The allowable deviation shall comply with the provisions of Table 1 in GB4436
Tube outer diameter
3.1.2 The straightness tolerance of round pipes shall not exceed 1.5mm per meter. 3.2 Variety specifications of finned pipes
GB9082.1-88
3.2.1 This standard only specifies the dimensions of cold-rolled round finned pipes. The outer diameter and wall thickness of finned tube are the same as 3.1.1. The geometrical dimensions of fins are shown in Table 2-0.5mm. The allowable deviation of fin thickness is ±0.05mm, and the allowable deviation of fin pitch is and Table 3. The allowable deviation of fin height is ±0.1 mm.
Fin thickness
Approved by the Ministry of Aerospace Industry of the People's Republic of China on April 14, 1988
Implementation on November 1, 1988
Fin thickness
Note: △ is the selected specification.
Tube outer diameter
20-~38
Fin pitch
Note: △ is the selected specification.
GB 9082.188
Continued Table 2
3.2.2 The maximum length of finned tubes to be supplied shall not exceed 6m. 3.2.3 The straightness tolerance of the finned tube shall not exceed 1.5mm per meter. 4 Technical requirements
4.1 The material of the tube is industrial pure aluminum L2, L3, L4 and rust-proof aluminum LF21. 4.2 The technical requirements of the tube shall comply with the provisions of GB4437. 4.3 The surface of the finned tube fin shall be smooth and no cracks are allowed.
4.4 The tube shall be hydraulically tested in accordance with the provisions of GB241. When calculating the test pressure, the allowable stress is 0.9 (tensile strength). Maintaining the calculated test pressure for 10 mn, the tube is not allowed to rupture, but deformation is allowed. 5 Test method of tube
5.1 The test method of tube shall comply with the provisions of GB4437. 5.2 See GB 241 for the hydraulic test method.
6 Inspection rules
6.1 The appearance and size of the pipes shall be inspected, and the size of the pipes shall comply with the requirements in Chapter 3. 6.2 Two pipes shall be taken from each batch for hydraulic test, and the test results shall comply with the provisions of Article 4.4. If one of the samples fails, double the number of samples shall be taken for re-testing. If one of the samples still fails, the batch of pipes shall not be accepted. 7 Packaging, marking, transportation, storage
7.1 The packaging, marking, transportation and storage of pipes shall comply with the provisions of GB3199. GB 9082.1-88
7.2 Pipes shall be shipped in special packaging boxes, and the super-sheet pipes shall be isolated from each other to avoid squeezing. 1.3 During transportation and storage, it is strictly forbidden to damage, be damaged and corroded, and store in a dry and non-corrosive environment. This standard was drafted by the Fifth Design Department of the Fifth Institute of the Ministry of Industry of China.
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