The issue of pump series connection during chemical pipeline pressure testing
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We have a petroleum refinery construction project here, and now we are about to carry out pressure testing on the above-ground pipelines. During the preparation of the materials needed for this testing, we encountered a problem: several DN100 pipelines have their highest points at a height of 100 meters. We are trying to use 2-inch hoses to fill these pipelines with water. I chose a pump with low head but high flow rate (H=40M, Q=18M3/H), but its capacity is not sufficient. I need both a high flow rate and a high head capacity. Could I use three such pumps in series to fill the pipelines? I’m not quite sure how to do this exactly; could someone please advise me on the specific approach? Thank you :)
It’s not acceptable if the inlet pressure of some pumps is too high; it’s best to consult the pump manufacturer regarding the maximum inlet pressure for this pump
Thank you. How is this feasible? In a series connection, will the total head be the sum of the heads of the three pumps?
This post was last edited by 3983596_FPPZ on 2019-6-24 at 17:26. It should be checked whether the mechanical seal of the last pump in the series can withstand a pressure of 80 meters (to prevent leakage)； Can the pump withstand a pressure of 120 meters (higher when the valve is closed)? ； Can the pump inlet pressure withstand a pressure of 80 meters (axial force balance)? If possible, it can be used temporarily; care must be taken during operation regarding the sequence of pump startup and the coordinated control of valves. It is recommended to prepare a proper startup and operation plan before proceeding.
Theoretically, this is a constant-pressure water supply unit for fire protection and air conditioning systems, capable of having three pumps operating simultaneously.
It is feasible to use pumps in series, just as with pipeline pumps for pressure enhancement; the key issue is pressure resistance
Thank you all. It depends on the capacity; I’ll ask the manufacturer when the time comes.
I have always had a question regarding pumps: Suppose there is a 20-meter-long section of straight pipe with a DN100 diameter, vertically installed on the wall of a tower at a height of 50 meters above the ground. If only this section of pipe is to be subjected to a pressure test, how can one determine what specifications the pump should have (such as head, flow rate, outlet diameter, and other relevant parameters) in order to fill this pipe with water? I hope experts can help me out! Thank you first
If it is for experimentation, they can be used in series. But if you plan to use it directly, it is recommended that you choose a multi-stage pump. Be sure not to use a single-stage one.