Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. TenPenny

    U-bend before pump suction inlet.

    It looks like an attempt to help create a pseudo self-priming pump. It might actually work if the pumps are occasionally shut down, but I surely wouldn't rely on it.
  2. TenPenny

    pumps with different kw rating

    It's not a question of 'should you' half the rpm; if you go from a 2 pole to a 4 pole, you WILL half the rpm, that's what the number of poles on a motor means. In a 50Hz system, 2 pole is 3000 rpm; 4 pole is 1500 rpm; 6 pole is 1000 rpm, etc etc In a 60 Hz system, 2 pole is 3600 rpm; 4 pole is...
  3. TenPenny

    pumps with different kw rating

    The kW rating is a measure of what power is required for the flow and head as specified on the datasheet. Notice that the impeller diameters are different. So, these two pumps are selected for different operating points, so therefore the power requirement is different.
  4. TenPenny

    clogged suction or discharge pump linr

    Which is why my earlier comment points this out.
  5. TenPenny

    clogged suction or discharge pump linr

    Pump curves would suggest otherwise.
  6. TenPenny

    clogged suction or discharge pump linr

    Look at your pump curve. If you're talking about a centrifugal pump, typically, the shut off head power (power pumping against a blocked line) is NOT the highest power point. Tyically, it's at run out (pumping against a wide open discharge). For some, such as axial flow pumps, it will be at...
  7. TenPenny

    Pump Impeller

    As a former Goulds rep, I'd go with the 3298, which has a Tefzel impeller, I don't recall any customers having issues with sulfuric acid with these pumps, pretty sure we sold 25 to 50 of them. So Teflon / Tefzel would be my go-to, whatever brand you use.
  8. TenPenny

    Looking for Traditional Method to Design Centrifugal Pump Impeller 🔧

    Centrifugal Pumps: Design and Application Hardcover – Illustrated, June 4 1992 by Val S. Lobanoff (Author), Robert R. Ross (Author) This has a section on design of impellers.
  9. TenPenny

    Material used for the rotating shaft in Flowserve BB2 centrifugal pumps?

    If it's an API610 pump, the shaft material would generally be as denoted in Table H2 (to be fair, my reference copy is the 10th ed).
  10. TenPenny

    Motor Bearings Overheating at 60 Hz – Seeking Expert Advice

    What flow/head is the pump running at? It looks like an OH5 style pump, so the motor bearings are carrying all the thrust loads of the pump. I'd say that the higher speed is overloading the motor bearings.
  11. TenPenny

    Anti reverse rotation arrangement

    Is this a vertical or horizontal pump? NRR (non reverse ratchets) are pretty standard on vertical pumps with hollow shaft motors. They are extremely rare on horizontal pumps, I remember one customer wanting to investigate such a thing about 5 years ago, I wasted about four days trying to find...
  12. TenPenny

    Family of Curves/ Catalogue of Pump Models - Help

    Do you mean what we call the hydraulic coverage / envelope curves, showing the range of capabilities for various sizes? Like this? To be honest, I don't know how I would do it but probably in excel and then figure out how to do them as envelopes.
  13. TenPenny

    Troubleshooting High Vibrations in API 610 Multistage Pump Operating with Saltwater

    When you say the flow is reduced to 13m3/h to reduce vibrations, does this mean you were trying it at a higher flow rate, or is this where you run it on salt water? The pump is designed for 100, and you're running at less than 15% of that. You can expect high vibrations and short bearing and...
  14. TenPenny

    Pump Efficiency limitation

    This definitely looks like a LF application, so I'm not surprised by the efficiency. What you are trading off is that the efficiency is low, but the shaft stresses are also low, so the reliability will be higher. I'm assuming that the site requirements for an API pump for HC condensate are the...
  15. TenPenny

    Friction loss for Flanged Concentric reducer

    That was a point that our profs in engineering school made repeatedly. You have to understand the result you are looking for, and what the numbers mean. If it's friction loss for a variable flow rate, then the 10% or 1% factor is likely meaningless. Learn to estimate and round as appropriate...
  16. TenPenny

    Pump Efficiency limitation

    An efficiency that low implies to me that you're looking at a 'low flow' pump. Some centrifugal pumps have straight radial vanes, like 24 of them, and are capable of very low flow rates, like 1 gpm. Although the efficiency is low, the hp is also low, so the actual amount of power lost to...
  17. TenPenny

    Friction loss for Flanged Concentric reducer

    Here is one source, scroll down a bit, and read the commentary. https://www.katmarsoftware.com/articles/pipe-fitting-equivalent-length.htm#:~:text=We%20can%20do%20this%20if,with%20its%20own%20Equivalent%20Length. 3. Equivalent Length Values for Reducers (Turbulent Flow Only) The pressure drop...
  18. TenPenny

    Best Choice for Slurry Pump Shaft Replacement

    If memory serves me, many of the Goulds slurry pumps have 1045 shafts with 4340 as the 'high strength' option. How this relates to your situation, nobody knows. It's simply one data point in the universe of possibilities.
  19. TenPenny

    Seeking Performance Curve for KSB AJAX MEGA M80-250 Pump

    I believe (and I stand to be corrected) that it is the same impeller/casing as what they call the MegaCPK, so the attached are the 50Hz and 60Hz curves. However, do your due diligence to confirm, or just use this as rough guideline, as it's unlikely that the performance would be radically...
  20. TenPenny

    Water Pump Meeting both NFPA20 and NSF61

    There is a thread ON HERE about this topic: https://www.eng-tips.com/threads/nfpa-20-dedication-of-fire-pumps.422637/ " Note: I found this paragraph from NFPA 20 - 2016 Edition, but no restrictions!!! 4.7 Pumps, Drivers, and Controllers. 4.7.1* Fire pumps shall be dedicated to and listed for...

Part and Inventory Search

Back
Top