When a pump factory manufactures pumps, does it create them strictly in accordance with the flow rate and head specified by the client, or does it choose a specification from existing options that provides some margin of safety?
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When manufacturing pumps, do pump factories create them strictly according to the flow rate and head specified by the client, or do they choose a specification from existing options that provides some margin? If each one has to be made anew, then for cast pumps, wouldn’t that mean new molds have to be created for each pump? For forged pumps, it is possible to strictly meet the specified flow rate and head; you can forge them in whatever way you desire
Look at all the worries you have; it’s really tiring. . . . . . . .
You can request a custom order; you’ll just have to cover the cost of the mold
The first half indeed is as the person on floor 2 said, while for the second half, the author’s understanding of casting and forging is truly impressive. Is this really such a way to twist logic?
Referring to hydraulic components: there are pumps that are cast, machined, or stamped; I have never heard of pumps that are forged. Why forge them? Is it for material strength, denser structure, or surface hardening?
During selection, a pump from the existing range of mature pumps is chosen whose performance parameters are close to those specified in the order, with a slight margin allowed (or it may not be necessary). However, when delivering the pump, it is supplied strictly in accordance with the parameters specified in the order, without any additional margin; the compliance between the performance results obtained during factory testing and the order parameters serves as the basis for delivery. Redesigning the hydraulic system is extremely rare, as it involves risks related to design capabilities and precision, as well as additional time required for design and mold creation, which significantly prolongs the timeline. There are also extra costs associated with design and molds. Redesigning becomes necessary only when no suitable pump model is available, or when the cost is too high and the given deadline is too long.
The manufacturer will select an appropriate model from its product range based on the specified parameters, and cut the impeller as necessary. Redesigning is only done if the parameters deviate too much from the existing profile. But then another problem arises: it is usually required to have proof of two pumps that have been in operation for over two years under the same operating conditions, so the possibility of redesigning them is low, unless you are an important client for them.
The cost of molds is fairly reasonable; special industries certainly have special requirements. The key is that the hydraulic performance designed needs to be tested through prototype development, followed by an inspection. It’s still okay if it passes the inspection on the first try, but if it fails, everything has to be redone, resulting in an indefinite timeline for completion. For example, in the nuclear power industry, it takes several years to supply a simple pump – regardless of the type of pump, it depends only on where it will be used – and ordinary industries cannot afford such delays
Most of them are selected from existing pump models