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STANDARD SPECIFICATIO~ FOR WRAPPED COLD WATER HOSE Serial Designation: D 177 - 24 These specifications are issued under the fixed designation D 177; the final number indicates the year of original adoption as standard or, in the case of revision, the year of last revision IsSUED AS TENTATIVE, 1923; ADOPTED, 1924 Material 1 These specifications cover hose for use in conveying cold water Covered for other than public or private fire department use I MANUFACTURE Construction, 2 The hose shall consist of: (a) An inner rubber tube; Rubber (b) Reinforcement of plies of cotton duck; Tube (c) An outer rubber cover Cotton Rein- 3 The rubber tube shall be smooth, uniform m quality and forcement thickness and free from injurious defects 4 (a) The reinforcement shall consist of plies of cotton cluck cut on a bias of approximately 45 deg., and applied evenly and firmly over the tube with not less than a !-in lap, not sewed The number of plies shall be as follows: INSIDE DIAMETER NUMBER OF HosE, IN OF PLIES !, ! 3 I, I!, I!, 2, 2t 4 2! to 4 5 The plies of duck shall be well frictioned on both sides with a rubber compound which shall firmly join the plies to the rubber tube and cover and to each other (b) The duck shall be evenly woven from high grade cotton and shall be free from mechanical defects (c) The reinforcement shall be sufficiently strong to enable the hose to successfully withstand the hydrostatic pressure test and yet at the same time be soft and pliable (1094) SERIAL DESIGNATION: D 177 - 24 1095 5 The rubber cover shall be uniform in quality and thickness, Rubber and be free from injurious defects Cover II PHYSICAL PROPERTIES AND TESTS 6 The tests necessary to determine the physical properties pre- Standard scribed in the following sections shall be made in accordance with Methods the Standard Methods of Testing Rubber Products (Serial Designa- Test tion: D 15) of the American Society for Testing Materials Sample Tests of 7 A sample 36 in in length shall be cut from each lot of 500 ft or fraction thereof of each size of hose ~:~:/nd 8 (a) In the case of hose 1ih or less in diameter, the test specimens Friction shall be cut.Ior:gitt~dinally from the san;ple of the hose; in the case of Test hose over 1m m dmmeter, the test speCimens shall be cut transversely Hydrostatic (b) The tensile strength shall be not less than 600 lb per sq in PTrestsure for the tube and 450 lb per sq in for the cover es • (c) The elongation at the breaking load shall be such that the original 2-in gage length of the test specimens shall stretch to not less than 8 in in the case of the tube and 6 in in the case of the cover (d) The set or permanent elongati