The other end of this tube is submerged in the flow stream. This air is released slowly by a needle valve into a length of bubble tubing. The Teledyne Isco 4230 Bubbler Flow Meter uses a small internal air compressor and reservoir. Once this was done a Teledyne Isco 4230 Bubbler Flow Meter could be used to measure the water level and calculate the flow rate. The solution we proposed was to have a contractor cut away the concrete covering the pipe upstream of the flume exposing the proper water level measurement location. What may be difficult to tell in the photo is that this ideal head measurement location has a concrete cover over the pipe so it is not accessible. Since a Palmer-Bowlus flume can still operate when backwards we just needed a way to measure the water level somewhere between 4” and 8” upstream of the flume. In this installation photograph you can see that the ultrasonic sensor mounting bracket is located on the downstream end of the flume indicating that the flume has been installed backwards. The approach section is a straight section of pipe upstream of the flume that typically includes a staff gage and an attachment for either a bubble tube or ultrasonic sensor bracket so a flow meter can be utilized to measure water level and calculate flow. However, many times a Palmer-Bowlus flume includes an approach section, as in this case.
A Palmer-Bowlus flume is symmetrical so it can work no matter which direction it is installed. If you guessed that the flume is installed backwards, you are correct! Now before we go too far let me clarify something. Can you identify it in this picture? I’ll give you a hint… the flow direction is from left to right. When we opened the manhole cover we found that there was an 8” Palmer-Bowlus flume, but there was one problem. We were informed that there was a flume installed in an existing manhole.
Elan quickcal install#
Due to the temporary nature of the flow study the customer was interested in renting equipment rather than purchasing and having our technicians install and remove the equipment. Our customer reached out to us to assist them in finding a way to measure flow at the facility. The purpose of the flow study was to quantify the volume of process wastewater being discharged so a pretreatment system could be designed and installed to satisfy the requirements of the local water control district. Recently one of our customers was contracted to perform a temporary flow study at a commercial bakery.
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