Help needed! What does this percent sign in the PID device parameter description field mean?
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This post was last edited by WallaceLee on 2022-6-25 at 20:43. As shown in the PID diagram’s device parameters section, in the description area for the parameters of a gas storage tank, there is a data value of 50%. As shown in the figure: The question is: 1. What does this 50% mean? What does it mean to express? 2. Does it mean the same as the rated filling ratio specified in GB/T 18442-2011 \"Fixed Vacuum Insulated Cryogenic Pressure Vessels\"? Is it expressing the proportion of the volume occupied by the gas to the total volume of the space? But it’s a gas, so that can’t be right either, right? Hope experts can help answer! !
The capacity of a single storage tank should be 50% of the total calculated capacity; both tanks are used together when in operation
Isn’t calculating the volume referring to the volume of a single storage tank? What about 2×100% then? What’s the difference anyway?
Is there a better explanation? ? I’m really asking for help! !
2X100% means one in use and one as backup; the calculated volume is the volume required by the process, which differs from the volume calculated based on equipment specifications
Is there any more information? There’s too little information to make a proper judgment; I’ll have to rely on what’s available. The device identifiers are quite long, but that’s not a problem. The last digits of these identifiers indicate that there are two devices, and their names are Instrument Air Receiver Tanks. Each tank’s total volume is likely 20.9 cubic meters. The dimensions, design pressure, design temperature, operating temperature, and operating pressure are all specified. Is 2×50% equal to 1? That would be appropriate. These two devices are used simultaneously, rather than one being in use while the other is on standby. It’s rare for static equipment to operate in this manner; such alternating operation is only seen in processes involving adsorption and desorption. So two units should be online at the same time.
It indicates that during normal operation, two containers are used simultaneously, with each container filled to 50% capacity
What if the working medium is air? Shouldn’t the air fill the entire container?
2*50% indicates two units operating in parallel, while 2*100% means one unit in use and one as a backup.