Discussion on issues related to the use of gear oil pumps
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It is well known that centrifugal pumps can be used in series. But can positive-displacement pumps such as gear pumps be used in series when they have the same flow rate? Can the head values be added together after it starts operating? If a single-stage pump has a high head, then is the final outlet head the sum of those of the two-stage pump, or that of the second stage? Welcome to discuss
Please, expert, explain it. I think the head will increase, but it won’t be additive.
They can be connected in series; the head is greater than that of a single pump but less than that of two pumps
Do not apply the theory of centrifugal pumps to gear pumps; the outlet pressure of a gear pump is primarily determined by the back pressure at the outlet. If the back pressure is high, it is sufficient to choose an oil pump that can generate such high pressure. I have never seen two pumps connected in series to achieve high pressure; if the flow rate of a single pump is not sufficient, two pumps can be used in parallel.