On the equipment table, instead of writing the head, can we write the operating pressure?
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There is currently a gear oil pump, and the flow rate and operating pressure are indicated on its nameplate. The general equipment table usually lists flow rate and head; it’s okay to also write down the flow rate and operating pressure, right?
It should be possible. Work pressure is related to head to a certain extent, and it involves the density of the medium.
No. First, the head and flow rate of a pump are the two most important parameters in pump equipment. Secondly, head is an independent parameter; the pressure difference = head * density * g, which involves two variables and thus cannot be represented intuitively. When the material is under high and low temperature conditions, there are two pressure differences, making it difficult to express this clearly.
Gear pumps do not require specification of pressure or head; they are backpressure pumps, and theoretically, the output pressure is equal to the backpressure applied
No, work pressure is related to inlet pressure; if the inlet pressure is very high, the difference between the two can be significant
I’ve never seen it before. Um… is the head and pressure of a positive-displacement pump proportional to each other, or is there a positive correlation between them?
Centrifugal pumps are generally specified by head, while positive displacement pumps are specified by outlet pressure.
The speed and structure of the centrifugal pump determine how high the pump can push the fluid (the outlet pressure is related to density), and overpressure will not occur. In contrast, positive displacement pumps have an outlet pressure that is independent of density. As for the pump’s capacity, it depends on the backpressure; if there is excessive pressure, a safety valve is needed to release it, otherwise the pump itself, the pipelines, and related components may be damaged.
This is a way of expressing performance, and it is better to express it in accordance with standards and conventions. When making a practical selection, it is often not sufficient to only know the head and flow rate; it is likely necessary to understand the pump’s performance curve in order to make a more accurate decision and avoid mistakes.