Posted by cadet trooper on June 27, 2008 at 15:20:10 from (69.223.83.75):
In Reply to: Re: VFD posted by CBBC on June 26, 2008 at 22:46:27:
Turbine pumps have been around for many years and I thing you have the right idea to do get rid of the air issue mechanically I'm very aware of the pressure regulating VFD issue which is used all the time in industry the one problem with that is if you have a break in the feed line and you happened to either be in bed for the night or gone away for a couple hours and have a break in the line the VFD kicks up to match the 4-20ma signal you have a massive crater where the break is and at 800 to 1000gpm that can be massive. The best thing we did was to add a low pressure switch to shutdown our diesel when the pressure dropped off suddenly with a startup overide it was the best thing we ever did saved our kesters many times. We had a water drive center pivot so when a hose blew it just sit and put 6" of water in one area of standing corn best yield I've ever seen over 200bpa.
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