Does a water storage tank count as a pressure vessel?

Based on the specified design pressure and operating pressure, the water storage tank can be regarded as a pressure vessel. .

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It is considered a pressure vessel; if it is ensured that the tank is always full of water, it may not need to be classified. If the tank is not full and there is a gas space above, it is likely to require classification

It must be a pressure vessel; whether it is subject to regulations depends on the operating temperature – if the operating temperature exceeds 100 degrees, supervision and inspection are required

If the temperature is at room temperature, i.e., not higher than 100°C, it is not considered a pressure vessel, but it is designed in accordance with the standards for pressure vessels. The standards for pressure vessels require that three conditions be met; this condition is not satisfied in the case of liquids. If nitrogen is used to maintain pressure inside, then, due to the presence of nitrogen, it is regulated as a pressure vessel.

Strictly speaking, looking at the gas space above, if the gas volume exceeds 30 L and the pressure is greater than 0.1 MPa, it is considered a pressure vessel; if it is all water and the temperature does not exceed 100 degrees, then it is not considered a pressure vessel