Use different jet nozzles (orifice diameters)for each application. Most high pressure water jet lances have the option of rotating nozzles specifically for this purpose.
If you have a VFD, why not operate the pumps at a higher speed when the tanks are full and then slow down to meet reducing NPSH availability as the tanks empty?
25 gpm at 200 psi is difficult for a reliable pump on sandy crude oil. Continuous or intermittent duty? You might try a rubber lined gear pump like Bowie Pumps, but the 200 psi may be too high for them. Worth a phone call though.
Re: syphoning. With such large pipe sizes you would need a valve on each end to prime the pipe. Such large valves would open too slowly to prevent loosing the prime. You would need instant opening of both valves simultaneously. This is why I suggested using explosives. This would also be...
What about using a syphon pipe. Two x 60 inch should do it. Each end could capped with thin steel plate and primed with a diesel driven pump. Explosive charges could be used to open both pipe ends at the same time (assuming no fish in the lake). Just a wild suggestion.
In this type of application suction pipe velocities are usually low and cavitation happens before vortexing. Get the Viking guy to calculate NPSH available/required. You may need a bigger diameter suction pipe.
Viking guy is wrong to say one full pipe diameter gap. Your calculation for area equivalence is correct. This usually results in a gap of about 1/3 pipe diameter. What is intake velocity into suction pipe? If pump flow only reduces when tank gets close to empty then this might be your...
Just a wild thought here, we have never actually tried this. What about cutting new key ways through the impeller hubs of the last 4 stages. This would allow you to progressively rotate/offset slightly these impellers on the shaft so that the blade passing does not occur all at the same time for...
To be legally able to sell a fuel additive at the retail/wholesale level all you need is EPA registration. This is a relatively simple, no cost procedure. Provided anticipated sales are less than $30 million per year, no testing would be required. Beware, product claims could come under the...
The Lubrizol Corporation recently tried to introduce an environmentally friendly diesel fuel called “PuriNOx” into California. If you Google the word “PuriNOx” and look at all the hits you should get a flavor of the regulatory nightmare involved in getting a new fuel technology into widespread...
