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Yes thats correct. This type of pump was a standard in this particular City, but normally pump stations are submersible usually with Flygt pumps. I do a lot of developer pump stations and the sites with high static head tend to have pumps that run far to the left. High head and not a lot of...

Thanks for your input. The pump curve is attached. These are 2-pumps w/20hp motor in series. I am not seeing where the motor would be a problem. I dont understand why the pumps stop running at about 91 psi discharge pressure when shut off head on should be around 106 psi. When they ran the...

I am considering getting a portable pump to pump through the bypass connection at a higher flow rate to try an move the air. The design operating point was closer to 2.8 fps and about 3.2 fps with two sets running, but of course it never got there.

An eccentric 4x6 ductile fitting. Dont have the amperage. I will see if I can get this. No VFDs See attached for pump station site plan and bypass detail. I said 4 inch bypass earlier, but its a 6 inch. I attached the pump station site plan and bypass detail. The calcs I attached on the...

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...

Thanks for eveyone's input, this was very helpful.

Sorry for not responding sooner to the comments I have been out of town and just got back. I wanted to provide some clarification on this project and I am waiting on some more information to come in. As I mentioned, the developer improvements (wells, possible elevated water tank, water and sewer...

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...

I am going to agree with Rabbit12. The applicant specifically stated they are a "Licensed Professional Engineer in State x and y", where the person let these licenses lapse so therefore they are not licensed in these States. I go along with what Florida Statutes say here: "No person other...

Thank you all for the responses. LittleInch - The questions was "Do you have a professional engineer (PE) license? There also was a section in the application process where they were asked to list "Licenses and Certifications". The engineering licenses were listed here. I am trying to give...

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...

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...

Thank you for your input.

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...

I really appreciate all the great comments and input. The municipality instructed me to use two 30 gallon drums. Apparently that is the setup for the other wells in their system and that works for them. Thanks again.

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...

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...

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...

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...

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...