The University of Minnesota, St. Anthony Falls Laboratory (SAFL) was contracted by Thirsty Duck, Ltd to conduct a testing program on a series of buoyant flow devices (BFDs). The focus of the study was to develop rating curves and analyze performance under extreme debris loading conditions for the TD series line of BFDs. The models tested include the TD248-48, TD246-48, and TD244-48. Performance under debris load was evaluated using a mixture of leaves, grass (hay), and aluminum cans. The discharge rate was monitored during the debris performance tests to determine if the debris impaired the function of the device.
Figure 1 contains a concept diagram of the TD system. Major device components include an orifice to control discharge, a float to suspend the orifice at a fixed distance below the water surface, a skimmer to prevent fouling, and an expanding conduit ("bellows") to convey water from the orifice to the outlet pipe. The device is designed to connect to the outlet pipe with a standard 150# ANSI flange connection. The three devices tested differ in their orifice and bellows diameters; however, the bellows length for each was the same. Device specifications are provided in Table 1.
Taylor, Craig A.; Hilsendager, Jon.
Third-Party Rating Curve Development and Debris Testing for Thirsty Duck® : TD Series Buoyant Flow Control Device.
St. Anthony Falls Laboratory.
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