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  1. dickon17

    Recomendation on a North American PD pump manufacturer

    Try looking at Gardner Denver Water Jetting Systems.
  2. dickon17

    Throtelling Pump systems

    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.
  3. dickon17

    NPSH Margin in Vertical Turbine Pumps

    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?
  4. dickon17

    Positive Displacement Pump Recomendations

    Try this company www.kawa-pump.co.jp They may have sales outside Japan.
  5. dickon17

    Positive Displacement Pump Recomendations

    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.
  6. dickon17

    What pump would lower a lake 10 m?

    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...
  7. dickon17

    What pump would lower a lake 10 m?

    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.
  8. dickon17

    Pump Suction Uptake Vortexing

    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.
  9. dickon17

    Pump Suction Uptake Vortexing

    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...
  10. dickon17

    Combing flows before pumping

    To help visualize this problem, what ballpark flow rates are we discussing here? How is the slurry flow rate fixed? Is the slurry abrasive?
  11. dickon17

    Engine manufacturer

    What about Ferrari S.p.A.? I think they make some quite good petrol engines.
  12. dickon17

    Who Invented the Projected Nose Spark Plug?

    Please give new issued patent number on projected nose plug. Without reading the patent how can we possibly comment?
  13. dickon17

    identify the cause of the failures

    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...
  14. dickon17

    diesel fuel additives... efficiency?

    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...
  15. dickon17

    diesel fuel additives... efficiency?

    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...
  16. dickon17

    diesel fuel additives... efficiency?

    Fuel additives effect on fuel economy and exhaust emissions generally use the following legally acceptable testing protocols: Light-Duty Vehicle Federal Test Procedure-75 (FTP-75) 40 CFR Part 86, Subpart B (Gasoline and Diesel fueled) Heavy-Duty Diesel Engine Federal Test Procedure (FTP heavy...
  17. dickon17

    diesel fuel additives... efficiency?

    Unfortunately, the fox is in charge of the chicken house. All major industrial fuel additive suppliers are naturally beholden to the large oil companies. No new technology will enter this market place unless exhaustive testing protocols have been completed. These are so expensive and time...
  18. dickon17

    Does reduced speed testing have an effect?

    You can test at 53% of duty conditions and calculate flow and head quite accurately. However, I would not trust the efficiency to be exactly the same. How much margin of error do you have?
  19. dickon17

    diesel fuel additives... efficiency?

    The Infineum product you refer to is their marine fuel additive F7450. This product removes and controls the build up of valve deposits and lacquer on the cylinder liners. The fuel saving (about 5% in the test) was an "unexpected benefit". If this is true, they probably have no idea how it works.
  20. dickon17

    Pressure drop in a pipe (ie) Bernoulli

    I have just found this interesting thread. Finding out flow rates in different sections of pipe having different lengths and different diameters and fed from the same source is a common hydraulic problem. To read this thread would make you think the solution would be impossibly complex...

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