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I concur with everything said, probably because the three of us are engineers or at least have a strong technical background. This guys website is absolutely littered with this type of misinformation (that is where I found the statement I posted). We've had a rather long email exchange where...

I agree with everything you are saying. VFDs are not a band aide to engineering, but they are useful if used properly just as control valves are useful if implemented properly. Please tell me if you agree or disagree to the following statement: "When the flow is reduced, the amps drawn by a...

That was the issue I took with the information presented as well, the comparison was made at an operating point that shouldn't exist in the first place. He then goes on to say this is business as usual for him, choking pumps to operate at a point far below minimum flow. He was obviously trying...

Morten, Thanks for the reply and the graphs. I think we are in agreement regarding using a VFD for a high static head system, it isn't the correct device for the job. Would you also agree with the document in the OP demonstrating how a throttling device over that same domain wastes more money...

Yeah I read most of that forum but no one sat down and did the math. I want someone to review my theory and notes for accuracy. From where I am standing right now there is no conceivable way you can claim a CSV throttling device saves money compared to a VFD, even when the VFD is grossly...

I've poked around on this forum and have noticed this has come up before. I was referred to this page by a gentleman named Cary at a cycle stop valve website. We have had discussions, if you could call it that, regarding the operating costs of CSVs vs. VFDs. I made some points from an...