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Search: Posts Made By: drbitboy
Forum: LIVE PLC Questions And Answers January 16th, 2020, 03:04 PM
Replies: 23
Views: 2,028
Posted By drbitboy
Okay, the circles I've traveled in call that a...

Okay, the circles I've traveled in call that a recirc, but I like that "pump chase" phrase.
Forum: LIVE PLC Questions And Answers January 15th, 2020, 11:31 AM
Replies: 23
Views: 2,028
Posted By drbitboy
Paradigm shift

Assuming the motivation for VFD speed control of DP is energy savings, there may be bigger fish to fry thermodynamically.

Assumptions

Heating with combustion flue gas (i.e. fossil fuel e.g....
Forum: LIVE PLC Questions And Answers January 15th, 2020, 10:27 AM
Replies: 23
Views: 2,028
Posted By drbitboy
I would be neat if DP across the pump mapped to...

I would be neat if DP across the pump mapped to torque, then the VFD could be set to use torque control.

That may be true on a PD pump, but centrifugals/fans no so much (if I increase DP by...
Forum: LIVE PLC Questions And Answers January 15th, 2020, 08:50 AM
Replies: 23
Views: 2,028
Posted By drbitboy
Thank you. A debate/discuission is not a...

Thank you.

A debate/discuission is not a fight, and anyway I repent in dust and ashes, and also revel in my participation in "the best way to get the right answer is to post a wrong answer"...
Forum: LIVE PLC Questions And Answers January 14th, 2020, 04:30 PM
Replies: 23
Views: 2,028
Posted By drbitboy
Actually, all of that is probably irrelevant,...

Actually, all of that is probably irrelevant, although it might provide rough guidance. Peter Nachtwey's answer, that it is linear enough, is the best. I think the suggestion behind that is that...
Forum: LIVE PLC Questions And Answers January 14th, 2020, 11:21 AM
Replies: 23
Views: 2,028
Posted By drbitboy
Is the pump centrifugal, positive displacement,...

Is the pump centrifugal, positive displacement, or summat else?

And what does the process, of which the pump is a part, look like?

What kind of response times would be satisfactory?

Where...
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