File:Experiments upon the discharge of water through small fire hose and nozzles (1911) (14781212241).jpg

Identifier: experimentsupond00kors (find matches)
Title: Experiments upon the discharge of water through small fire hose and nozzles
Year: 1911 (1910s)
Authors: Korsmo, Edward Oswald Neininger, Alonzo Beda
Subjects: Fire hose Nozzles Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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be tested. The couplingand nozzle were also horizontal. The pressure gauge for reading press-ures at the base of the nozzle was hung on a framework, the center ofthe pressure gauge being at the same elevation as the center of thepiezometer coupling. The water was defected with a hood into a measuringtank where the rate of discharge was determined. This was accomplished by observing with a stop watch the time reauired to discharge either300 lb. or 500 lb., depending upon the rate of discharge. The time wasread to one-fifth of a second. The rate of discharge for nozzles A, B,and C was observed for pressures ranging from 12 lb. per sq. in. to 35lb. per sq. in., and from 5-0 lb. per sq. in. to 21.0 lb. per sq. in.nozzle D. One or more check readings were taken for each head. In everycase the drain cock was opened before taking pressure gauge readingsin order to remove the air and prevent any errors from this source. Thepressure gauge was also rapped lightly at every reading to prevent any
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error due to the inertia of the pointer. FRICTION IN HOSE: Lack of room made it impossible to lay thelOO-ft. of hose in the tests for friction in hose in a straight line.Instead, the hose was laid out with as easy curves as possible, withthe first and second piezometer couplings close together. The piezometercouplings were on the same elevation as the nozzle and were connectedso as to measure the loss of head in the 50-ft. length of hose next tothe nozzle. Each piezometer was connected with a rubber tube to a diff-erential mercury gauge thus obtaining directly the head lost in thehose. The discharge through the hose was measured with nozzle D, whichhad been previously calibrated. A large nozzle was used in order thatthe work might be carried on with low pressures and still have a goodrange of velocities. This necessitated reaj.ing the pressure at the baseof the nozzle with a pressure gauge. In crier to have two connectionsa tee connection was made with the pressure chamber. One connec

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