Wow this is my first forum thread, I'm impressed with the responses. The force issue and the flow dispersion issue are the two that I'm most concerned with. And we just did a level spreader on another project so this concept is being adapted at present. To Twinkie's point, the contractor...
Thanks man, the thrust is definitely an issue. I've calculated the force and will be getting the structural involved. I'm hoping he can dowel into the wall but its made of boulders. Will not be easy getting this past him. In the meantime the flow calcs are still escaping me. I've changed...
We've experienced contractor error which led to a 36" outlet pipe discharging out of a CRM wall (16' high) with way too steep of a slope. I originally designed a drop inlet structure before the wall (not constructed) which led to adequate exit velocity. The property line is 5' from the outside...
Lburg that is a good suggestion. The problem with that is to fit two pumps of the size required, the minimum diameter is almost as big as our well diameter. I looked into a stepped cylinder, with the bottom being 4' diameter then transitioning to a 6' diameter, but the pumps need 5.5' at the...
The benefits of reducing pump output are almost negligible on retension time because the time it takes to discharge the pumped volume will still be very small even with minimum velocity through the force main. I'm looking into maximizing the grout around the pumps as well as temporary filler or...
Thanks for the responses. sjohns I am going to utilize just that, a float switch controled by a touch screen for easy adjustments. However the state spec (hawaii) requires a minimum of 6 inches between on and off floats, as well as maximum 30 minute retension time. The first phase will be...
thread161-194365
I'm designing a large residential sewer pump station. Due to development phasing, the initial flows are much lower than final flows. The retension time during initial phases is unavoidably long given pump submergence requirements. Septic conditions is a concern, is a bubbler...
