CHICAGO TESTS PUMPERS ON 32-STORY SKYSCRAPER
Fire Department Conducts Test on Standpipe of Strauss Building—Description of Building’s System—The Official Figures of the Test
AN interesting test, using motor pumpers in connection with the standpipe system of a 32-story building standing 475 feet in the air was made in Chicago, I11., on Sunday, May 4, by the fire department of that city. This test was in the Strauss Building, Michigan and Jackson Boulevards, and was under the direction of Deputy Fire Marshal John C. McDonnell, the then chief of the fire prevention bureau. The official figures are given herewith.
According to the official report the standpipe system in this building consists of an 8-inch header circling the basement. This is connected to three Siamese fire department connections. 4 inches in diameter. The 8-dnch header in the basement is connected to four vertical standpipe risers 6 inches in diameter, extending from the ceiling of the sub-basement up to the twenty-second floor level, which is 260 feet above street grade; then only one standpipe continues up to the thirty-second floor, 425 feet elevation, being reduced to 4 inches above the 260-foot level. Each standpipe riser is in a stairwell and has two openings on each floor, basement and roof. One opening being a standard 2 1/2-inch opening with no hose and an l 1/2-inch opening with 75 feet of 1 1/2inch unlined hose. There is a four-stage centrifugal electric driven automatic fire pump located in the sub-basement. There is a 200 H. P. electric motor driving this 1,000 gal. per minute pump, capable of developing 250 lbs. pressure. A 2,000 gal. cushion tank, one-half air and one-half water, maintains 50 lbs. pressure at the highest opening, 425 feet above street grade. This cushion tank operates motor automatically as soon as pressure is reduced. An 8-inch suction supplies the pump which also has an 8-inch discharge. A pressure gauge was available at the top of the standpipe on the thirty-second floor, at 425 foot elevation.
Test on Standpipes and City Pumpers, Strauss Building, Sunday, May 4, 1924—Pumpers, Mack, Seagrave, Ahrens-Fox
NOTE: 490 ft. elevation from street level to tower level, 25 ft. drop same as other test records show. 2-inch tip siamesed used in above test.
(Continued on page 1284)
Test on Standpipes and City Pumpers, Strauss Building, Jackson & Michigan Boulevards, Sunday, May 4, 1924
Mack Pumper, Type A C 2 Model D 145 Chassis No. 733700
NOTE: 425 ft. head from street level to nozzle discharge level, 25 ft. drop from Siamese connection to standpipe line in sub-basement.
Seagrave Pumper, Model No. D-9 No. 30162
NOTE: 425 ft. head from street level to nozzle discharge level. 25 ft. drop from Siamese connection to standpipe line in sub-basement.
Ahrens-Fox Pumper, Model l-M-2 Register No. 892
Chicago Tests Pumpers on Skyscraper
(Continued from page 1265)
In this test one Seagrave No. 9, one Mack, type AC-2, model D and one Ahrens-Fox, model 1M2, triple combination cars were used. Arrangement of pumpers on the street was the same for all three apparatus. Each pumper had two 50-foot lengths of 2 1/2-inch hose connected to Siamese, except as noted in the four official tables published on page 1265. These tables give a very accurate idea of the test.
In the official report mention is made that “the pressure gauge on the Mack pumper was found to be inaccurate, A complete test by a Crosby positive dead weight testing apparatus caused corrections to be made accordingly. All gauges were tested by this same apparatus. Gauge testing conducted by L. J. Gibbon, hydraulic engineer, Capt. A. J. Mullaney.”