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  1. alexcmmi

    Agricultural Runoff Treatment System?

    Somewhat unique situation here. Large animal facility in fully developed, built out, urban area. Run off currently discharges into municipal storm drainage system which in turn dishcarges to surface water, and there is coliform and turbidity proglems. Need to treat large volume of storm...
  2. alexcmmi

    Backflow Preventer in Pump Suction

    Municipal Water Distribution Application - Potable Water We are trying to design a very basic water booster station to provide adequate pressure to a proposed development located 'up a hill'. Pump station is to be designed w. 1 jockey, 2 duty and 1 high flow pumps. Minimum suction pressure...
  3. alexcmmi

    Operating pressure for ductile pipe , & joints for BURIED application

    Go to a DI Special Class 56 and you will have your maximum wall thickness. This pipe is still 'rated' to 350 psi, but most manufactueres will tell you its good for more. I had this discussion with several DIP manufacturers and I think they can only rate pipe to 350 psi, so you will not find a...
  4. alexcmmi

    Pool water storage and discharge tank

    civilperson - that is definitly against the law in some states / municipalities. Maybe in your town / City / State that is kosher, but that is definitly not the case everywhere...
  5. alexcmmi

    Schedule 40/80 vs C900 water pipe

    Pressure rating is your difference. As stated above: Sch 40/80 PVC is same OD as steel pipe C900 is same OD as DI pipe. You will get higher pressure rating from the C900. C900 has surge allowance factor of 2 built in. See unibell.org for all PVC pipe questions - the are the DIPRA of...
  6. alexcmmi

    Pool water storage and discharge tank

    How about any precaster local to you that sells septic tanks? Drop a effluent pump in in and call it a day?
  7. alexcmmi

    sewer forced main problems

    So the original designer did not spec out combination air release / air/vacuum valves at the high points? BIMR - while I respect your opinions, I would have to disagree with you on the not using an automatic air release valve. They are crucial for venting air on long force mains, especialy...
  8. alexcmmi

    sewer forced main problems

    The muffin monster is a comminutor. They are common at these facilities and at pump stations. If you had space, the better option would have been a mechanical bar screen, but that generates a entire other waste stream which needs to be discarded. Hence probably why the original designer went...
  9. alexcmmi

    Check Valve for Water Booster Station - experience with..

    We spec'd out GA Series 250 Air cushioned swing check valves. The contractor submitted val matic surgebuster tilted disc check valves. Application is raw water. There are several locations throughout the delivery system where the valves will be needed...mostly 12", flows base 2604 gpm. Any...
  10. alexcmmi

    Velocity through check valve - max and min

    A supplier brought to my attention that I had an unusually high velocity going through a check valve in a PS design I was working on... Pump is split case, 10" suction x 8" discharge. Design point is 2604 gpm at 177'. Service is raw (high quality) water, 60 deg F - nothing out of the...
  11. alexcmmi

    Septic tank effluent FM discharge to gravity sewer - Odor control?

    http://www.purafil.com/Products/purafil-water-wastewater-air-filters.shtml MOLE Manhole scrubber. Never used one, but if you do, let me know how it works...
  12. alexcmmi

    Vertical Turbine - Bearing Spacing

    Many Thanks for the responses thus far. The critical speed analysis has indicated that with 5' spacing, we will be WELL below the 1st mode shaft critical speed. With 10' spacing, our operating range is between the 1st and 2nd mode shaft critical speeds. However, we WILL avoid them altogether...
  13. alexcmmi

    Vertical Turbine - Bearing Spacing

    Well, through further research it seems the cut off for short set vs deep well applications is 20 feet. However, I am not sure how reliable the source is. Is this 'cut off' specified in HI standards? If my application is indeed 'deep well' it seems the 10' spacing may be more applicable Any...
  14. alexcmmi

    Vertical Turbine - Bearing Spacing

    My question is w. regards to max bearing spans for use in a VT pump Application is raw water through a Ranney collector well (so screened and river bed filtered). 40 to 65 deg F. Should be very good quality raw water. Pumps are 300 HP, design operating point is 2604 GPM at 328' TDH. Most of...
  15. alexcmmi

    sewer forced main problems

    RWF7437 - Its not the two WEMCO pumps that are operating in series - its the submersibles (listed as 4x4x11 a few posts above) and the horizontals (WEMCO 4x4x14) that are in series... The suction line of the horizontals is filled by the submersibles. The submersibles are located in the 10' dia...
  16. alexcmmi

    sewer forced main problems

    Wow, that design is 'interesting' to say the least. I think i would have done things JUST A BIT differently (read: it wouldnt look like that all). I just dont understand the double pumping (pumps in series) in this scenario? Why not just use biggers submersibles and cut out the horizontals...
  17. alexcmmi

    sewer forced main problems

    NPSH = Net Positive Suction Head a = available r = required. NPSHa > NPSHr for you pumps to work. I am still not following you, but it sounds like you have an inline situation where the sumbersible pumps in the wet well feed those horizontal close coupled pumps in your picture? I am...
  18. alexcmmi

    Ductile Iron Special Class question

    FYI - DIPRA is your friend! You will find your regional DIRPA engineer very helpful on these kinds of questions! They also have A TON of great info on thier site.
  19. alexcmmi

    sewer forced main problems

    I am not following everything you are saying with sump pumps (?) but just looking at that suction piping, I am wondering if you might have NPSHa issues. Suction pressure is 35 psi? How does that compare to your pumps NPSHr? How do the pumps SOUND when they are running? Our those pumps just...
  20. alexcmmi

    Proposed Collector/Drop Manhole on Ex. Deep Interceptor Sewer

    To me, it sounds like the most technically challenging part of that project is the excavation to the sewer. Might need to put in some sheeting, or else you will need a pretty wide excavation to get down 25' Any reason you dont want to use a precast doghouse over the existing interceptor? I am...

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