For pipes and valves, which is more difficult to handle: water at 10 kilograms of pressure or compressed air at 10 kilograms of pressure?
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I would like to ask the experts: for pipes and valves, which is more difficult to handle, water under 10 kilograms of pressure or compressed air under 10 kilograms of pressure? In other words, can pipes and valves that can withstand 10 kilograms of compressed air also withstand 10 kilograms of water?
The same. It’s just that the air pressure is a bit dangerous; if the tube bursts, it could injure people. The water pressure is fine; it’s still the water that causes harm
Liquids have a static pressure generated by their liquid level, while this can be ignored for gases. In other words, the total pressure = atmospheric pressure + the hydrostatic pressure of the liquid column exerted by the liquid level at the bottom. That’s why liquids are stronger than gases. For reference.
1. The pressure is the same. 2. Water: Due to the presence of static pressure, the pressure at higher and lower points is different. For example, in a closed pipeline, when water is used for pressure testing and there is a height difference of 100 meters, the pressure at the highest point is 6.3 Mpa; thus, the pressure at the lowest point is 6.3 + 0.98 = 7.28 Mpa. 2. For gases such as air or nitrogen, the pressure is the same at both high and low points. However, it is highly destructive; if there is a tear in the pipe weld, the danger is much greater than that posed by water. 3. For natural gas transmission stations, water is required for strength testing; as it is a destructive test, water is a safer option in the event of any issues. Gas is used for tightness testing, as pipeline valves and equipment are all in operation, making leaks easier to detect.