How is the operating pressure of a fluid system determined?
Thread Content
For typical closed fluid systems, they generally consist of pumps, valves, containers, reactors, heat exchangers, filters, desalination units, pipes, and so on. Due to the frictional loss, the difference between the pump’s outlet pressure and its inlet pressure is equal to this frictional loss. Throughout the entire system, the operating pressure decreases sequentially from the pump outlet. So, what exactly do we mean by the system operating pressure that we usually talk about?
In the design, the design pressure is determined based on the operating pressure and operating temperature. The normal operating pressure is determined based on the highest pressure in the entire system, that is, the pressure at the pump outlet. (In practice, the pump’s head is often used directly.)
My personal understanding of the system pressure issue mentioned by the original poster is the highest pressure within this closed system. This pressure may be at the pump outlet, or it may not be there. For example, when the elevations of the various components in a closed system are not consistent, and the pump is located in the middle or upper part of this system, the highest pressure point within the system may not be at the pump outlet. The head of a pump and the system pressure are even less related to each other, as in some closed systems the pressure is very high, yet the pump’s head is low. At this point, the system pressure is determined by a combination of the pressure of the liquid being added, the pressure of the liquid being discharged, and the pump’s head.
Operating pressure is not a precise concept; it generally refers to the normal operating pressure of the core or critical equipment in a system.
Personally, I think it is the outlet pressure of the pump.
The pipe resistance should be calculated first, plus the pressure in the outlet container
I think operating pressure refers to the pressure at the pressure measurement point of interest.
The operating pressure of the system is determined by the process conditions, while the head of the pump is determined by the resistance in the system. :lol
“. . . System operating pressure. . . Which point’s pressure are you referring to? " Personal opinion: Sentences of this kind are meaningless. It can be waived. As a professional engineer, the sentences in a report should be very clear. This type of ambiguous sentence only creates problems.