Selection of a set of pumps
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There is a set of clean water pumps with a flow rate of 800 m3/h and a calculated head of 45 m. Now two pumps are required; the estimated head with these two pumps is 47 m. What flow rate and head should the pumps have?
Just choose a model with a capacity of 800 m3 and a head of 47 m. The pump manufacturer will increase these values accordingly as the rated flow rate and head; they will not use the figures you provide. As a result, the flow rate and head of the pump chosen will be slightly higher than the values you specified, but the pump will still operate within an efficient range under the parameters you requested
For separation, should we choose 2*400m3 with a head of 47m? There are currently two manufacturers: one offers models with a capacity of 2*420m3 and a head pressure of 48m, while the other offers models with a capacity of 2*410m3 and a head pressure of 50m. The quotes and background information of these manufacturers are similar; so which one should be chosen from a technical perspective?
It feels the same; looking at the curve, it’s estimated to be 420 cubic meters, with a length of 48 meters!
Consider the motor power and the pump’s efficiency; choose a lower motor power and a higher pump efficiency, as this directly affects the energy consumption during operation
Thank you. Due to the customer’s budget constraints, we didn’t choose a well-known manufacturer; I’m a bit worried about the performance guarantees and am still undecided.
The medium used for transportation is plain water, not any toxic or harmful chemical substances; ordinary manufacturers are capable of meeting the requirements. At most, there might be some leakage from the mechanical seals
There is another issue now: a flow meter was originally designed to be installed on the main export pipeline, but the client has requested that it be removed. What problems might this cause in terms of production and operation?
You must be a designer who only works on paper, with no experience in production or on-site work. You focus on what kind of control results the client wants; if the client wants to add a certain amount of water to a tank or container, what matters is the final liquid level, while the real-time flow rate isn’t something that concerns you
Assessment of the pump, and other issues.
It seems that the flow rate of this water pump is 800 t/h; the two pumps operate in a one-active-one-redundant configuration, so a flow rate of 800 t/h is sufficient, with a head of 47 meters. If measurement is required, a flow meter is installed on the collector pipeline at the pump outlet. After telling these to the manufacturer, he will propose a suitable model and configuration. The main thing to check is whether the motor power is sufficient; in order to save money, manufacturers sometimes choose motors with a lower power rating.