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  1. PUMPDESIGNER

    Machining HDPE

    We asked a machine shop to make some parts for a pump intake out of HDPE pipe and 1/2" thick sheet. The machinist if having severe problems, breaking bits, bending tool shafts, etc. I know nothing have seen nothing, but that seems strange, very strange. The machinist has never machined...
  2. PUMPDESIGNER

    Copper Discoloration

    When copper conductors or wire overheat slowly due to slightly excessive current flow, the color of the copper first takes on a deeper reddish color. If the overheating is continuous that color tends to stabilize and remain constant. If the circuit is disconnected and allowed to remain unused...
  3. PUMPDESIGNER

    Double Volute Pumps

    Looking for manufacturers of end suction double volute pumps. Some manufacturers still make end suction double volute pumps, but only in larger sizes. Goulds for instance makes double volutes but only three sizes: 1000 gpm @ 240' TDH, 2000 gpm @ 120' TDH, and 4500 gpm @ 100' TDH. We need pumps...
  4. PUMPDESIGNER

    3450 RPM Motor at 1750 RPM

    Is there any long term problem running a 3450 rpm submersible motor permanently at 1750 rpm with a VFD, so long as sufficient water is moving to cool the motor? 2 Pole motors are much less expensive than 4 Pole. I have to have the VFD anyway, why not save money on the motor? PUMPDESIGNER
  5. PUMPDESIGNER

    Droop Instability

    Curious, I strive to eliminate droop on all pumps in our system. I notice that many pump companies do not do so, some of the largest companies included. I figured it was always due to their excessive drive for maximum efficiency for sales purposes, you know, "Our pump pumps more than their...
  6. PUMPDESIGNER

    Mag Meter

    I spoke with Siemens today about their Magmeters they want us to use on our equipment. He stated flat out that they care not at all about flow runs or pipe and fittings before or after their flow meter. The 2" model I looked at was flanged on either side, about 10" long. This seems about right...
  7. PUMPDESIGNER

    Graph Problem Displays Zero Values

    In Excel - Graph showing data from a table has lines showing zero values for cells with zero values, screws up the appearance of the graph with all those colored lines and when data is "short", there is no data for the last values in a column, then the line with that short column of data drops...
  8. PUMPDESIGNER

    Excel Phone Number Hyphen Insertion

    I have scrounged several thousand phone numbers off a database. Able only to put the 10 digit phone numbers into one cell. Is there a method to insert the hyphens into the phone numbers so they are easier to read? Other than hard work that is. Thank you for all the past help you guys have been...
  9. PUMPDESIGNER

    Seawater Pump

    I am being asked to replace the pumps on a four lane underground tunnel that is below sea level. Project is overseas. The pumps dewater the tunnel which appears to have moderate leakage from the ocean a few feet away, why I do not know. The pumps in place fail constantly and they are tired of...
  10. PUMPDESIGNER

    Applied Fluid Dynamics by Blevin

    Am contemplating purchasing this book. Any comments good or bad? PUMPDESIGNER
  11. PUMPDESIGNER

    FLA Formal Definition

    I am stuck on FLA (Full Load Amps) for motors. Where does the formal definition of FLA come from? I suspect NEMA may provide that, but I cannot afford to purchase MG1 unless I know that contains the definition. I find many code uses for FLA, but in NEC and in the Freeby Condensed MG1 I find no...
  12. PUMPDESIGNER

    Hydraulic Book

    What are the best books for teaching and explaining hydraulic theory from basic through to advanced theory? I need these sources to be authoritative and credible, but also include good explanations and examples. Multiple books are required I assume, but if a book tried to cover everything in...
  13. PUMPDESIGNER

    Removing Text from Cell

    I have cells with mixed contents, numbers and text. Is there a method to quickly extract just the number or delete the text? The number is a dollar amount $200.00 format. Dollar sign I do not care about, but I would like to get to that 200.00. Thank you. PUMPDESIGNER
  14. PUMPDESIGNER

    Capacitor Info Needed

    Our electrical engineer is a digital guy, knows nothing about start and run capacitors. The caps we need to specify and purchase are: 270-324 MFD @ 330 VAC 216-259 MFD @ 330 VAC 130-154 MFD @ 330 VAC 30 microF, 35 microF, and 45 microF all at @ 370 VAC and others also. Question 1 - What are...
  15. PUMPDESIGNER

    Reversing a Transformer

    Electrical know little here. Have 75 KVA transformer, 480 volt primary, 208 volt secondary. Any reasons why I cannot use this transformer in reverse? I would like to use it for testing purposes on motors. Any problems expected? PUMPDESIGNER
  16. PUMPDESIGNER

    Need Books or Papers

    I am looking to buy books or research papers, (will take freebies too), about surveys of large numbers of centrifugal pumps. I have seen reference made of one such large survey where the author studied a large number of centrifugal pumps and analyzed how their NPSHr, Specific Speed, Suction...
  17. PUMPDESIGNER

    Line Reactors

    We need a few line reactors for use on top of VFDs. We need them in 1-2 weeks, so inventory is important. 40hp and 10hp 480 volt 3 phase Suggestions for reliable and knowledgeable vendors would be appreciated. Although we have an electrical engineer he claims to know little, prefers to play...
  18. PUMPDESIGNER

    Flange Gasket Screen

    My company would like to install a screen as a flange gasket for shipping new pump stations to prevent gravel, rocks, debris from entering the pumps where they become caught in the impellers. After the first hours of operation this gasket would then be removed and a standard gasket installed...
  19. PUMPDESIGNER

    Waterproof Wire Penetration Fitting

    Please give me references for manufacturers of any waterproof wire penetration fittings/systems. Wire penetration must withstand up to 300 feet of water head, (130 psi) maximum. Wall thickness of bulkhead is from 1/4" up to 1/2". Wire size is AWG #3 through AWG #10. Large volume of...
  20. PUMPDESIGNER

    Pump Testing

    Would appreciate any recommendations for independant testing companies for pump analyses. Most testing is done by a manufacturers, but we need independant verifications. Thank you. PUMPDESIGNER

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