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  • Users: Berko
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  1. Berko

    STORM WATER PIPE VELOCITIES

    Hi cvg, Thanks for your comments. Unfortunately this large pump station has no facility to de-grit the flow prior to the storm pumps. In fact the problem with this wet well is that due to a very large, unbenched wet well the client is having to dig pumps out of large quantities of sand & grit...
  2. Berko

    STORM WATER PIPE VELOCITIES

    Dear All, Can anyone help me with a design question. We are looking to pump Storm Water which has large quantities of road grit (varies from sand to granite chips upto 15mm diameter). The pumps involved will be pumping at a flow of 190 L/s through a 25M vertical rising main. Can anyone...
  3. Berko

    Diaphragm Pump Problems

    Hi There, Without knowing your actual pump duty it is difficult to comment. The Pitbull is something a little special as it has no diaphragms to fail & is a very simple yet effective design. They have an excellent website: http://www.pitbullpumps.com which shows just what the pumps are...
  4. Berko

    Pump Stations

    Hi RJL, I am assuming that these are sewage pump stations ? Most of the pump manufacturers with a sales presence in Australia will have a CD ROM pump selection programme (eg, ITT, KSB, ABS, Hidrostal, Grundfos, EOne (?) etc). What are you looking for when you make your pump selection, low...
  5. Berko

    Municipal Sludge Tank Mixing

    Hi Poopusher (like the nickname), Thanks for your input. I tend to agree with you regarding Hidrostal & their safety factors. For our application Vaughan & Hidrostal offered identically sized motors, even though Hidrostal had an additional 10-11 % hydraulic efficiency point advantage. When...
  6. Berko

    Municipal Sludge Tank Mixing

    Hi Sawtry, Just wondering if you have had a chance to get the info requested about your Hidrostal mixing system. I did a bit of investigation work myself & asked for Hidrostal's comment to your feedback. The response from Hidrostal was: - 1. They have heard of isolated instances of solids...
  7. Berko

    Municipal Sludge Tank Mixing

    Hi Sawtry, Thanks for the info. It would be interesting to see the Vaughan demo model in action. We are seriously looking at the Hidrostal mixers, as the end user has a preference for a system where all the mixing components can be maintained externally of the tank. Also the end user has had...
  8. Berko

    Municipal Sludge Tank Mixing

    Hi Andrew, Thanks for the reply, You have given me much food for thought (decisions, decisions !!!) Will let you know how we get on. Berko
  9. Berko

    Municipal Sludge Tank Mixing

    Hi Andrew, You seem to have a pretty good handle on various mixing systems. How easy was the Vaughan system to install ? Have you any experience of the the other recirc. pump mixing system we are considering, the Hidrostal tank mixing system ? We are leaning towards this, as we have used...
  10. Berko

    HIDROSTAL SLUDGE TANK MIXERS

    Hi All, Here's one for you UK based wastewater engineers. Can anyone give me some feedback, good or bad about Hidrostal sludge tank mixers. These mixers seem to be only installed in the UK & getting site references out of Hidrostal in the UK is proving hard work. We are considering using...
  11. Berko

    VAUGHAN CHOPPER PUMPS

    Hi kchayfie, I'm glad I bumped into you !! We are looking to put a sludge tank mixing system in Fiji. We have considered submersible mixers (ABS & ITT), but have had past issues with them ragging & hassles with "in tank" maintenance. This leaves us looking at the Vaughan Rotamix system + the...
  12. Berko

    Program for viscous fluid

    chbit63, I am not sure what you are pumping, but here is my two pennies worth. For Sewage Sludges TR185 (Frost) is used to calculate pipe friction losses when pumping viscous sludges. In terms of correcting pump performance for viscosity with factors, each manufacturer's design de-rate...
  13. Berko

    Municipal Sludge Tank Mixing

    Hi Andrew, Looking back at your thread of last year, how did you get on with your mixer application ? We are currently looking at a sludge tank mixer system in Fiji. We have narrowed down our choice to submersible mixers (ABS or ITT) or pump recirculation systems (Vaughan or Hidrostal). We...
  14. Berko

    VAUGHAN CHOPPER PUMPS

    Hi Kchayfie, I am interested in your comments relating sludge tank mixing. We are considering one of these system for a raw sludge mixing system, which is one of my reasons for the original thread. Our concerns are: 1. The nozzles & pipe ring main bore size appear very small & must rely on...
  15. Berko

    How bad is it in the UK?

    Folks, An interesting discussion. I served a toolmakers apprenticeship within the UK Nuclear industry in the late 1980's. In 1987 when I started my training we had 8000 people on site, when I left in 1991 there were less than 2000 ! This was due to Government cutbacks, however this trend...
  16. Berko

    VAUGHAN CHOPPER PUMPS

    Hi All, Does anyone have experience of Vaughan Chopper pumps. How do they cope with rag laden sewage/wastewater ? How well do they chop solids once wear takes place at the cutters ? Any feedback on these pumps good or bad would be appreciated. Regards, Berko
  17. Berko

    VAUGHAN CHOPPER PUMPS

    Hi All, Does anyone have experience of Vaughan Chopper pumps. How do they cope with rag laden sewage/wastewater ? How well do they chop solids once wear takes place at the cutters ? Any feedback on these pumps good or bad would be appreciated. Regards, Berko
  18. Berko

    Pumping Paper mill sludge

    Cellucrete, Try Hidrostal or Skan pumps (both centrifugals) or progressive cavity pumps can be used. Berko
  19. Berko

    VIBRATING DRY WELL SUBMERSIBLE SEWAGE PUMP

    Hi All, We have a single vane, dry well submersible sewage pump (4 pole speed, 220 kW) which has an operating duty of 500 L/s @ 40M. The pump is vertically mounted on the OEM's purpose built suction stand. When the pump runs, the following vibration levels have been recorded. Vibration at...
  20. Berko

    VIBRATION LIMITS IN DRY WELL SUBMERSIBLE SEWAGE PUMPS

    Arkie Boy, The pump in question is new & has just been commissioned. Clearances were checked before installation. Pump came with a balancing certificate which checked out OK. Wear is not an issue. VANSTOJA Due you have any rules of thumb for acceptable vibration ratios you mentioned (for a...

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