How San Francisco Tests Hose
San Francisco requires all new hose to stand a test of four hundred pounds with safety, thus giving the firemen confidence in the hose when using the high pressure. New hose is required to stand a pressure of 1,300 lbs. before bursting.
All hose purchased by the San Francisco Fire Department is given three tests and if it stands all three tests it is accepted. These tests are the hydraulic test; the adhesive test and the tensile test.
The hydraulic test requires the hose to be subjected to a hydraulic pressure of four hundred pounds. While under this test the hose must not leak, or sweat or break the threads of the cover, it must not contract in length and shall not increase its external diameter more than 1/16 of an inch at any point.
The hydraulic tests are made on specially constructed testing apparatus located at the Commissary and Repair Shops of the San Francisco Fire Department. The testing device has five outlets and by means of reducers, pipe from one to four and one-half inches in diameter are tested. Extending from the outlets are constructed tables fifty feet in length on which the hose length to be tested are laid. The testing device or manifold is connected by a triplex three-stroke hydraulic pump operated by an electric motor. A gauge is also provided to show the pressure. A by-pass is arranged to by-pass the water if desired.
San Francisco has one of the highest pressures of any city in the United States, the pressure being as high as 329 pounds when the valves are operated.
CHARLES W. GEIGER
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