[China Aluminum Industry Network] 1 The material of small-sized aluminum pressure-bearing boilers should meet the requirements of GB3193 "Aluminum and Aluminium Alloys Hot-Rolled Plates" and GB/T3190 "Deformed Aluminium and Aluminium Alloys Chemical Composition". The allowable stress of aluminum material is selected according to the mechanical properties provided by the national standard, and its safety factor is NB=4.0 and NS=1.5. The wall thickness of the drum (shell) or hearth must not be less than 4 mm.
2 The plug-type full-penetration T-joint structure can be used for the drum (shell) of the small-sized aluminum pressure-bearing boiler, the connected furnace head and the connected head and tube sheet.
(3) The heads of small aluminum pressure-bearing boilers shall be made of a single piece of aluminum plate. No more than two pieces shall be used for splicing. The spliced ​​weld shall be made of a fully-penetrated structure and ensure penetration.
4 Small-sized aluminum pressure-bearing boilers must use water-sealed safety devices that meet the following requirements:
(1) The diameter of the water seal pipe shall be determined according to the rated capacity and pressure of the boiler, and the internal diameter shall not be less than 25 mm;
(2) When the water seal device is installed, its effective water column height shall not exceed 4 meters and only allow negative deviation;
(3) No valve shall be installed on the water seal pipe and anti-freezing measures shall be taken at the same time.
5 Small-scale aluminum pressure-bearing boilers shall be subject to a hydrostatic test every two years. The hydrostatic test shall be carried out in accordance with the provisions of Article 25. Before the hydrostatic test, necessary internal and external inspections should be conducted.
6 Small aluminum pressure-bearing boilers must not be cleaned with acids and alkalis.
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