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Hi, We live in a relatively cold climate (ontario, canada) and our company has had issues in the past with a Storm Sewer freezing. This sewer was slightly above the recommended depth of bury for frost but was adequately insulated. The pipe froze between the building connection and a...

Hi, We are working on the design of the aeration tanks for a conventional activated sludge plant and we are considering using a common blower system using either turbo blowers or PD blowers. Our control philosophy will be: - Blower speed is controlled by pressure in header of common manifold...

Hi, I am reviewing an existing WWTP outfall pipe capacity. The outfall has a diffuser assembly on it, which is made up of four riser pipes with 90deg. elbows and nozzles. I've done a lot of pressurized tile bed calculations and was thinking of using the same technique to analyze the capacity...

Thanks for the reply. One other question I have relating to open trench designs...how do you usually account for minor head losses in concrete trenches? I have a concrete trench that will be turning 180deg. and I am not sure how to account for minor losses in this trench as I am sure the...

Thanks for the replies. When doing the exercise described, I assume I should be using the critical depth of the channel as the minimum depth in the slope equation? Josh

Hi, I am working on a WWTP and we are using rectangular concrete trenches. There are numerous locations where the concrete trench has to be flat for sections (i.e. across UV lighting, around screens, etc.). When calculating the capacity of the trench I always use mannings formula but mannings...

Thanks for all of the responses. I will size the pump to operate at the design flowrate at a head equal to the friction loss and static elevation difference to the air release valve. One other issue I am trying to wrap my head around is the following: The existing pump we are replacing was...

Hi, I am working on an existing system which pumps water at 14.5 l/s from a supply (groundwater) well, through a network of piping into the building, up a 20m vertical shaft to a penthouse, through a condensor, then backdown the vertical drop and back to a return well. The piping is all 100mm...

I am finalising a design on an inline water booster station that will be supplying a low pressure zone in a Town's distribution system. The pressure zone we will be pumping into is a closed system (i.e. no elevated storage tank/pressure tanks). The pumping station will be equipped with...