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  • Users: djcbgn
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  1. djcbgn

    Sewer Pump Station underperforming at Start Up

    Hi, I was asked to look at a new sewer pump station that is not performing as intended. The pumps are S&L suction lift pumps. This is a two pump series arrangement (attached) There is approximately 10,600 feet of 6inch pvc (sdr18) force main and about 19 feet of 4 inch suction pipe(20 max lift...
  2. djcbgn

    Drinking Water Well Pump Control Strategy

    Hi, I am working on a very large development project (2000 homes at buildout), for which the city is requiring the developer to install wells to provide water supply. The developer does not want an elevated tank on the site and there is a connection to the county system for emergency water...
  3. djcbgn

    Potential Hire Claimed a PE license but verification showed it had lapsed

    Hi, We have a position open for an engineer although a PE license is preferred but not required. A person applied and on his resume it showed PE licensure in two states and on the general application he answered YES when asked if they possessed a PE License. Upon further review, the persons...
  4. djcbgn

    Drinking Water Well

    Hi Everyone, I have experience with municipal drinking water wells but it was many, many years ago. I am currently working on one now and a test well has just been performed and I am waiting on the well test report. I post this because I was asked about what I will need from the hydrogeologist...
  5. djcbgn

    Fluoride addition and pH

    Hello, I am working on a drinking water well for which the City requires adding fluoride (fluorosilicic acid). My understanding is that fluoride addition will not depress the pH enough to add another chemical like caustic for pH adjustment. I am waiting on the water quality report from the...
  6. djcbgn

    Sodium Hypochlorite Tank for Drinking Water Well

    Hello, I am working on a design of a drinking water production well (100 gpm) in a small town that's water supply is supported by several drinking water wells. My question is related to the tank size to use for 12.5% sodium hypochlorite feed system. The amount of sodium hypochlorite used per...
  7. djcbgn

    Sewer Pumping Downhill

    Hi I am designing a sewage pump station with a flow of about 700 gpm. The force main will run entirely downhill, where the discharge elevation is about 120' below the pump station. The proposed 8" force main is about 25,000' long. There really are no prominent high point in the profile, some...
  8. djcbgn

    Retrofit high service pumps with VFD

    Hello Everyone, We are installing VFDs on our High Service Pump Station pumps at the WTP. There are currently 3 large (duty pt.:6,000 gpm @ 360' TDH)and 2 small(3,000 gpm @ 360' TDH) constant speed split case centrifugal pumps. The pumps have been running out on the curve causing excessive...
  9. djcbgn

    Retrofit high service pumps with VFDs

    Hello Everyone, We are installing VFDs on our High Service Pump Station pumps at the WTP. There are currently 3 large (duty pt.:6,000 gpm @ 360' TDH)and 2 small(3,000 gpm @ 360' TDH) constant speed split case centrifugal pumps. The pumps have been running out on the curve causing excessive...
  10. djcbgn

    Retrofit High Service Pumps with VFDs

    Hello Everyone, We are installing VFDs on our High Service Pump Station pumps at the WTP. There are currently 3 large (duty pt.:6,000 gpm @ 360' TDH)and 2 small(3,000 gpm @ 360' TDH) constant speed split case centrifugal pumps. The pumps have been running out on the curve causing excessive...
  11. djcbgn

    Pump over a hill

    My hydraulic model consists of a raw water system with a high point approximately 3,000 feet from the pump station and the ultimate discharge point about 40,000 feet from the pump station. After the high point the pipe runs downhill only about 5,000 feet and then the pipe is flat for the...
  12. djcbgn

    Water Main Pressure

    this is a quick one.... If I have a section of water main that has hydrant on it. The hydrant has a pressure guage that reads 60 psi (static). There are valves on both ends of the water main, which are then closed to isolate this section. What happens to the pressre at the hydrant when the...
  13. djcbgn

    Sewer Modeling Reference Book

    Any suggestions on a good reference book for sanitary sewer modeling, setting up dry and wet weather hydrographs with a lean towards XP-SWMM. I know XP software has some modeling books, does anyone recommend these? Thanks.
  14. djcbgn

    Drainage Well

    I am designing a stormwater injection well in South Fla. The stormwater runoff flows by gravity into the well. The depth of the well casing is about 70 feet below ground surface elevation and the open hole extends about twenty feet from the well casing. The groundwater level is about 4 feet...
  15. djcbgn

    Stormwater Injection Well

    I am designing a stormwater injection well in South Fla. The stormwater runoff flows by gravity into the well. The depth of the well casing is about 70 feet below ground surface elevation and the open hole extends about twenty feet from the well casing. The groundwater level is about 4 feet...
  16. djcbgn

    Fire Flow Requirments

    Two methods for computing fire flow that I am familiar with are from the Uniform Fire Code (UFC) and ISO. I am working on a high rise project where the fire sprinkler designers used the NFPA (hydraulic method) for the design. Would it be valid to use the fire sprinkler capacity as the fire...

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