If the tube side medium is softened water, with a design pressure of 1.6 and an operating temperature range of 20–130°C, can it be classified as Category II?
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The diameter of the tube sheet box is 450 mm, with a volume of 0.25 cubic meters. The medium used is softened water; the design pressure is 1.6 MPa (with an operating pressure of 1.4 MPa). The operating temperature (at the inlet and outlet) ranges from 20 to 130°C. Can it be classified as Category II? (Note: The shell side is classified as Category I. )
The answer to this question requires taking into account China’s Special Equipment Safety Law and relevant technical regulations. In accordance with the Special Equipment Safety Law and relevant regulations such as the Classification and Grades of Boilers and Pressure Vessels (TSG R0004-2009), the classification of pressure vessels takes into account factors such as the hazard level of the medium, the maximum operating pressure, and the effective volume. Among them, the hazard level of media is classified into four categories: A, B, C, and D, with demineralized water belonging to category D, which represents the lowest level of hazard ； The maximum operating pressure and effective volume correspond to the classification criteria for pressure vessels, respectively. In your case, the softened water falls under Category D in terms of hazard level; the design pressure is 1.6 MPa, the operating pressure is 1.4 MPa, and the effective volume is 0.25 cubic meters. In accordance with the relevant provisions of the \"Classification and Hierarchy of Boilers and Pressure Vessels,\" the parameters of this pressure vessel should allow it to be classified as Category II. However, please note that the answers above are based on the information you provided. As for the classification of the equipment, a final decision must be made by qualified professionals taking into account the specific parameters and operating conditions of the equipment. Furthermore, there may be differences in the safety supervision of special equipment across different regions, and the specific regulations and technical standards can vary; therefore, you need to refer to the latest and most authoritative regulations and standards. .
When the working pressure is greater than 0.1 MPa, the maximum working temperature is higher than the standard boiling point of water, and both the volume and diameter meet the requirements specified in TSG 21; such equipment definitely falls into a specific category.