Browsing by Author "Dahlin, Warren"
Now showing 1 - 3 of 3
- Results Per Page
- Sort Options
Item Friction Factors for Helical Corrugated Aluminum Pipe(St. Anthony Falls Hydraulic Laboratory, 1969-12) Silberman, Edward; Dahlin, WarrenThe St. Anthony Falls Hydraulic Laboratory was engaged by the Aluminum Association to determine the friction factors for fully developed flow in helical corrugated pipe of several sizes.Item Further Studies of Friction Factors for Helical Corrugated Aluminum Pipes with Re-Corrugated Annular Rings on Each End(St. Anthony Falls Hydraulic Laboratory, 1976-03) Dahlin, Warren; Silberman, EdwardThe St. Anthony Falls Hydraulic Laboratory was engaged by Kaiser Aluminum and Chemical Sales, Inc., to determine the friction factors for fully developed flow in 24 and 12 in. helical corrugated pipes flowing full and to make qualitative observations of the pipe joint characteristics. These pipes are unique in that the pipes were manufactured by customary procedures for helical pipe and then the ends re-corrugated with four annular rings using a special machine. The pipe characteristics are given in Fig. 1 and the physical features are shown in Figs. 2 and 3. The purpose of the re-corrugated pipe ends is to make it more convenient to connect the pipes together under field conditions.Item Model Studies of Dropshafts for the Tunnel and Reservoir Plan(St. Anthony Falls Hydraulic Laboratory, 1975-01) Anderson, Alvin G.; Dahlin, WarrenThis report describes the model studies carried out at the St. Anthony Falls Laboratory of the diversion structures and dropshafts to be incorporated into the Chicago Tunnel Reservoir Plan. The diversion structures will divert runoff from existing conduits at the surface to dropshafts used to transport the runoff down to deep tunnels which serve as temporary reservoirs. The model studies involved the construction and testing of two diversion structures, four vertical dry weather flow dropshafts, two sloping dry weather flow dropshafts, and three vertical storm water flow dropshafts. Also during the test program, various modifications were made on these basic models. The purpose of the model studies was to assist in the development of effective and practical diversion structures and dropshafts and to study their hydraulic operating characteristics for various flow conditions. Numerous modifications were made, with limited documentation of each, to develop an optimum design. When an optimum design had evolved, more detailed observations were made during which static and fluctuating pressures were recorded and black-and-white photos, colored slides, and colored movies were taken. Photographic documentation proved to be an excellent method of recording the overall hydraulic characteristics of the structures and the air entrainment and escape mechanisms.