Thank you! That’s the chart I’ve been looking for. I was theorizing that the head loss at 1 or 2 fps might be unusually high because the check valve was barely open, and then it would stabilize at higher velocities. This chart clearly shows that nothing unusual is happening at low velocities
Does anyone know a good way to figure out the head loss through a weighted check valve in a sewage pump station?
Most of the pump stations I work on have weighted check valves on the discharge line. We typically install them because operators like the visual confirmation when the pump is...
The pipes in question are made of terra cotta, and the grouting I'm referring to is not limited to where the pipes enter the manholes. Instead, it's the type of grouting that's injected into the joints of a pipe anywhere along the sewer main. This process is done from inside the pipe by a...
I am trying to figure out what is a reasonable life expectancy for grouting sewer main joints. The webinars that I see online state that grout (such as Avanti AV-100 Acrylamide Grout) will last forever. It is approved by the US Department of Energy to encapsulate radioactive waste and is rated...
The standard pipe bedding that I see is clean stone around the sewer main. However, I have a municipality that requires modified stone (crushed stone) around all sewer mains. The thought is that the reduced permeability of the modified stone will have less ground water moving through it...
I usually work on wastewater treatment plants around 1 or 2 MGD and have noticed the BOD5 concentration entering these plants fluctuate significantly from day to day. The influent concentrations can be anywhere from 150 mg/l to 400 mg/l and I do not see a pattern. These systems are mostly...
I am looking for a resource (either a book or continuing education) to help me understand how to analyze the hydraulic profile through a wastewater treatment plant. I have done this type of analysis before but I am trying to get more confidence and accuracy in my results. Treatment plants have...
IRstuff: Thank you, that pdf was very helpful.
bimr: I am basing 100 gpd based on what I have seen from township billings. I have looked at water billings for 3 townships that my company represents (total residential use divided by the number of customers, not the individual billings...
I am working on a small municipal wastewater treatment plant (50,000 gpd) which is primarily fed by a low pressure sewer system. We have an activated sludge process and the problem we are having is the influent gets too cold in the winter for nitrification (our plant is in northeast...
I am working on a project for a 50 unit apartment building and trying to size the water service. The service is 750-ft long, so due to the length I am concerned about dynamic losses. Since I am not designing a fire flow, I feel that there is no need to be overly conservative and do not want to...
I never heard of having prevailing wages for h1b workers. The wages listed are ~20% higher than what companies around here pay their regular employees so on that basis alone, no one would not hire you.
Just yesterday, I was thinking about leaving engineering and become a laborer. I don't mind the physical work, it seems a lot less stressful (as a laborer not a foreman), and with Prevailing Wages the income would be higher. Maybe it's a grass is greener thing.
In 2006 I was in the same situation. I worked in Long Island and made 45k with 3 years experience. We were still in the "glorious housing boom" and I was getting 2-3% raises a year. I talked to all of my friends from college and all of them were making more. Even the one who graduated with a...
The three companies I have worked for since 2002 only ever gave out 0-3% raises per year. These companies rarely hired recent college grads since they could get someone with a several years experience for only a little bit more. I'm not sure if this is true everywhere but personally If my son...
