[China Aluminum Industry Network] 1. The material of a small aluminum pressure-bearing boiler should meet the requirements of GB3193 "Aluminum and Aluminium Alloy Hot-Rolled Plates" and GB/T3190 "Deformed Aluminium and Aluminium Alloy 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-shaped connection structure can be used for the drum (shell) of the small-sized aluminum pressure-bearing boiler, the connected head and the tube sheet.
3. The heads of small aluminum pressure-bearing boilers shall be made of a single piece of aluminum plate, and shall not exceed two pieces when splicing. The spliced ​​weld shall adopt a full penetration structure and ensure penetration.
4. Small-size 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 should conduct hydrostatic tests every two years. The hydrostatic pressure test should be performed with reference to the “boiler overall hydraulic pressure test processâ€. Before the hydrostatic test, necessary internal and external inspections should be conducted.
6, small aluminum pressure boiler can not use acid, alkali cleaning.
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