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  1. piffer

    Pump station intake geometry

    Use of formed suction inlets can reduce construction cost (footprint size) as well as optimize inlet conditions to the pumps. Check with Flygt-Xylem.
  2. piffer

    Vertical vs. Horizontal Submersible Pumps

    Vertical dry-pit submersible pumps are mounted on pedestals (or stand) and include an inlet elbow attached to the bottom of the pump. A horizontal dry-pit submersible pump is installed like a typical end suction centrifugal pump. The inlet conditions are much better (Horizontal- straight shot...
  3. piffer

    Sewer Lift Station: steep slope inlet pipe or inlet free fall?

    Reliner / Duran Inc. makes "drop bowls" which help alleviate air entrainment. Do a quick internet search.
  4. piffer

    Sewage Lift Station-Low Flow, High Head

    I am aware of a PC Pump operating OK in a sewage lift station application. As chris00nj states, "And wrapping (in case you have hair and fibres) can become a problem, too." If the PC pump becomes problematic and expensive to maintain in this installation, all of your options (pre-screening...
  5. piffer

    Lift station headaches...

    A conventional non-clog sewage pump (submersible or dry-pit)will not be a happy camper in a prison collection system. Flygt and Vaughn both make submersible chopper pumps that are used in this type of application. This is the toughest job for any sewage pump because of the varied and unusual...
  6. piffer

    Simple Pump Application Question/Suggestions?

    I am trying to design a simple pumping system to transfer water over a 10' high wall that divides two basins. I want to use a 7.5HP submersible pump for this application. Design flow will be ~1-1.3 MGD. Static head will vary between 2 and 7 ft. In order to create sufficient TDH, I considered...
  7. piffer

    Submersible vs Vertical Turbine (Raw Water Feed)

    mechprocess, you didn't mention the application. Most submersible pumps have limitations on metallurgy and max. operating temperature. Other than that, I think submersibles are generally easier to service and maintain. There is no comaprison between pulling a vertical turbine pump and a...
  8. piffer

    Suction Inlet Size

    I have a portable submersible solids handling pump mounted on a self-supporting stand in a large open pond. The pump curve shows BEP to be 1500 GPM @ 29 FT TDH. The pump curve ends at ~2500/10. The pump is operating just beyond BEP at ~1700 GPM @ 26 FT TDH. This pump has an 8" discharge and...
  9. piffer

    Ozone Generator for Odorous Air (H2S) Treatment

    Vapex makes an "ozone fogger" and only requires 110V power and a garden hose connection to generate ozone. I beleive their facility is in Florida and they have a sales rep. in No. california. They should be able to answer your questions. ITT Flygt (in U.S.) sells an odor control system that...
  10. piffer

    Grinder Pump Question (Use Limitations)

    Quick rule of thumb- Only use grinder pumps when flow rate is less than ~100 GPM. The grinder pump allows you to use a 1-1/2" or 2" discharge pipe because solids are reduced in size and can be transported at velocities> 2'/sec. For higher flowrates, use 4" dia. pipe as long as you have...
  11. piffer

    Old Pump Manufaturer

    United Centrifugal Pumps, San Jose, CA. They were bought out by Byron-Jackson, then Flowserve. Check out Flowserve's website.
  12. piffer

    Axial Flow Pumps, Viscosity Correction

    Thanks vanstoja, I have seen plenty of available literature on the subject of "fluid viscosity effects on centrifugal pumps." The charts in HI are applicable to centrifugal pumps, but caution against applying them to axial flow pumps. There are a few papers I've come across on this subject...
  13. piffer

    Axial Flow Pumps, Viscosity Correction

    Are there any technical papers that discuss prediciting axial flow pump performance is viscous applications?
  14. piffer

    Lift Station and VFD's

    tmurf, ITT Flygt's pump selection program (FLYPS) does nice graphical presentations of multiple VFD operated pumps. The best way depends on your system (system head curve). There are also advanced pump station VFD controllers (duplex, triplex, etc) on the market that will optimize multiple...
  15. piffer

    Grinder Pump Wet Well Assistance

    Scott, Check out this website: http://www.biostim.com/ Regards, Piffer
  16. piffer

    VIBRATING SEWAGE PUMP

    Hello Berko, I wanted to point you back to what "micjk" was talking about. Do you have spectrum analysis capability? Have you performed "ring" tests on pump (at the top of motor) and on the suction and discharge piping? This will tell you if pump speed (or vane pass) coincides with any...
  17. piffer

    Odor Control System

    Does anybody have experience with a VAPEX hydroxyl fog odor control system? Rather than drawing air from source and treating it, the Vapex system fogs the wetwell (or manhole, whatever) with a hydroxyl fog. Curious if the "hydroxy" will attack anything.
  18. piffer

    Can BUMP starting a Centrifugal pump cause wear ring melting together?

    Consider self lubricating stationary wear ring (Graphalloy) when you rebuild the pump...What is the wear ring material combination used in your pump?
  19. piffer

    Plastic Piping for Submersible Sewage Pump Stations

    What are the drawbacks of using FRP (plastic) piping within a submersible sewage pump station. Most U.S. municipalities that I work with standardize on ductile iron piping within a pump station. Plastic piping is commonly used in Canada, with excellent results. I am wondering if anybody can...
  20. piffer

    Sanitary Lift Station for a Subdivision

    call romtec in oregon.

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