Parallel connection of heat transfer oil circulation pumps
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There is a heat transfer oil furnace that requires a circulation pump with a flow rate of 600 cubic meters per hour. If two pumps are used in parallel, what should be the flow rate of each pump?
Parallel operation is generally not recommended; although theoretically it should not affect the flow rate, in practice increased pipe resistance and other factors will certainly result in a significant reduction in the actual flow rate when operating in parallel. If it is only for temporary use, parallel connection can still be considered; however, if a flow rate of 600 is required frequently, it is recommended to use one pump. Experience data shows that if parallel operation is necessary, approximately 600 units require two 400-unit pumps to be used in parallel.
I agree with Dou Shuai’s view; when there are too many parallel pumps, it’s necessary to have backup pumps
The rated flow rate is 570 cubic meters, so a pump with a capacity of 600 cubic meters should be selected. When operating for extended periods, a two-in-one-backup circulation system should be used. I saw on a hot water-related website that the flow rate of two identical pumps increased by 8% – is that correct?
It depends on the piping setup and length; there is no fixed rule. After all, the pump itself allows for some degree of adjustment, so +10% is considered a safe margin
I agree with this; it’s best to have one as a backup.
Do you need a heat transfer oil pump with a capacity of 600 m3/h? What is the head in meters? Each unit of ours can achieve 500 m³/h at a head of 80 m
The pump at your home won’t break down in the hospital; there’s no need to use a backup pump
I’ve encountered situations where pumps were connected in parallel, and one of the pumps had almost no flow – it was as if the water was flowing in reverse
Many systems are operated in parallel these days; what about those with high flow rates that cannot be used in parallel? After all, the flow rate of a single pump is limited