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  1. Chris73

    Options when perc tests fail

    Hi there; Maybe any sewage onsite disposal system experts out there? What options do you have if 2' of silty clay loam / massive over impervious layer (clay). 3 out of 4 perc tests show infinite perc time. According to the local practice manual this soil is unsuitable for onsite systems -...
  2. Chris73

    Pump Station with Gravity Connection

    to bimr, I understand the systematic of waterhammer and what to do normally. And I agree that the upslope section of this forcemain can be subject to waterhammer that needs attention. But I was questioning the usage of the mentioned: (cit) "...spring-loaded valve at the end that would close...
  3. Chris73

    Pump Station with Gravity Connection

    hi gordini, I don't understand the point of the valve in option 3. Why would you want to keep the pipe full at all times? Take option 2 and off you go. Instead of a air release valve you will need a combination air valve to allow air into the pipe after the pumps stop. This will allow draining...
  4. Chris73

    High Phosphorus in Wastewater

    Hi bimr, I haven't seen the official results yet but the lab said that P would be in the 60 - 70 mg/l. That's a lot but could it cause the following problem: the plant does not build up any biomass - virtually clear of solids although reseeded a few times. pH and DO are ok and the plant used to...
  5. Chris73

    High Phosphorus in Wastewater

    Hi Eng's, how can an unusual high P level in a treatment plant influent cause harm to the plant's operation? Can high P upset the plant? Which levels are critical for extended aeration plants with no advanced treatment? What's the solution? Pricipitation prior in the equalization tank? Thanks!
  6. Chris73

    Forcemain pumping downhill

    Hi out there, I got a similar but yet different question than a few threads earlier here: I am looking at a proposed sewage forcemain which will convey the wwater about 8 km to the nearest municipal system. To about 4 km down of the pumpstation, the forcemain has a continuous rising grade...
  7. Chris73

    chlorine concentrations

    Hi there, Does anybody know about a table with chlorine concentrations in water (swim pool) and impacts on humans? Normal, max. allowed ... lethal...? Something down that line? Thanks!
  8. Chris73

    Negative pressure C-900 CL150 sewer forcemain

    won13, I have recently done a waterhammer study on a 150 mm PVC SDR 26 pipe and its critical negative pressure was -313 kPa. I would assume that a C900 8" is at least this. Good luck!
  9. Chris73

    Pump arrangement

    Hi there! Quick question: I am designing a water booster pumpstation, using multiple stage axial split centrifugal pumps (due to 500 ft head). How can I determine how close the suction pipes can be situated to each other if coming off a main suction header. Is there a rule of thumb or any fancy...
  10. Chris73

    Pipe Jacking

    Pipe jacking: There are several jacking systems available for smaller pipe sizes which usually utilize some kind of drill head to loosen the ground and a screw to transport the displaced soil to the start excavation. A pressing station in the start excavation pushes the jacking pipes gradually...
  11. Chris73

    Centrifugal Pump versus Vertical Turbine Pump

    Hi Eng's; Can you guys tell me a bit from your experience when you would prefer which of these two pump types when designing a new water system? Would topography/hydraulic have an impact on the decision?
  12. Chris73

    Guideline for Concrete Finishing

    Does anybody have the ACI 302.1R, 6.4.4 Chapter 7 available and would send it to me? I need that urgently until 13 June for a court case! Thanx a lot! cmoch@umagroup.com (250)475-6355
  13. Chris73

    Simple (?) Sanitary Sewer design problem

    I wouldn't go smaller than 6" in size. Definitely you want to determine the more relevant average daily flow through the pipe and check the velocity at x% full status. This velocity should be min. 2'/sec if you want to avoid sedimentation and potential odour problems.
  14. Chris73

    Fecal Coliform

    I just need that number for an outfall study to calculate the dilution of the plume. It's just residential sewage and no disinfection.
  15. Chris73

    Fecal Coliform

    What number of fecal coliforms can one expect to be dicharged from a activated sludge - sewage treatment plant? Just a common number! Does 200 per 100ml sound alright?
  16. Chris73

    Waterhammer

    ...to do the graphical solution starting with using the charts in paragraph 48, page 87-92. I calculated the two necessary parameter for the charts (2*rho; k*2L/a) but the second (k*2L/a) came up to 4.15 and is therefore way off the charts. I checked all the numbers and there is no error. It's...
  17. Chris73

    Standards for P&ID's

    Could anybody send me a list of symbols being used in Northamerica for generating Process and Instrumentation Diagrams (for wastewater treatment plant). Or could anybody confirm that the symbols are the same like in the european standards? email: cmoch@umagroup.com fax: (250) 475-6388 Thanks...
  18. Chris73

    On-land Fish Farm

    Hi Eng's, Does anybody know about design standards, guidelines and requirements for on-land fishfarms in Canada or Northamerica at all?
  19. Chris73

    Waterhammer Analysis By Hand

    Hi Eng's! Can somebody tell me or give me link to an accepted method of doing a waterhammer analysis by hand? The situation is a sewer forcemain of app. 800m lenght between two liftstations - cont. up-slope. Especially I would like to determine the low-pressure curve over the entire pipe! Is...
  20. Chris73

    Dosing Aluminumsulphate?

    Excuse me: it must read: there is no industrial feed!

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