Trang 1 STANDARD SPECIFICATIONS FOR COTTON RUBBER-LINED FIRE HOSE FOR PRIVATE FIRE DEPARTMENT USE.. These specifications apply to cotton rubber-lined hose for Covered.. a The jacket or
STANDARD SPECIFICATIONS FOR COTTON RUBBER-LINED FIRE HOSE FOR PRIVATE FIRE DEPARTMENT USE Serial Designation: D 14-23 These specifications are issued under the fixed designation D 14; the final number indicates the year of original adoption as standard, or in the case of revision, the year of last revision ADOPTED, 1915; RESUBMITTED AS TENTATIVE, 1921; ADOPTED IN AMENDED FoRM, 1923 Material 1 These specifications apply to cotton rubber-lined hose for Covered private use for fire protection purposes They cover the following sizes: 1!-in single and double-jacketed; 2-in single and double jacketed; 2!-in single, double and triple-jacketed; 3-in double and triple-jacketed; 3~-in double and triple-jacketed I MANUFACTURE cotton 2 (a) The jacket or jackets shall be well, evenly and firmly Fabric made from good cotton, as free from unsightly defects, dirt, knots, Rubber Lining lumps and irregularities of twist as is consistent with good manu- facturing practice ' (b) The cotton jackets shall be seamless and have the fillers woven around the hose throughout its length and the warps inter- woven with and covering the :fillers Where more than one jacket is prescribed, they may be separate or interwoven 3 (a) The lining shall be made a properly vulcanized rubber compound which will comply with all of the tests specified in Section 8 It shall consist of not less than three calendered sheets in one solid body and shall be lap-jointed with the lap as small and neat as is consistent with good results (b) The lining shall be smooth and practically free from pitting and other imperfections and from corrugations (c) The lining shall be of uniform thickness and not less than the lower limit nor more than the upper limit given in item (b) of Table I, exclusive of the backing ( 1074) SERIAL DESIGNATION: D 14 - 23 1075 (d) The backing, if used, shall not exceed 0.028 in in thickness Flexibility It need not be of the same composition as the rubber lining, but the Workman- adhesion between the rubber lining and the cotton jacket shall comply ohip with the test specified in Section 9 4 The hose shall be flexible and easily coiled 5 The character of the workmanship shall be such as is incident to good manufacturing practice - - - - - - - - - - TABLE I - Size and Number of Jaoketo Property 1!-in 2-in 2!-in 3-in a!-in - - Single Double Single Double Single Double Triple Double Triple Double Triple · (a) Prescribed internal di- 1! 2 2 2! 2! 2! 3 3 3~ 3~ ameter, in 1! 0.049 0.049 0.049 0.058 0.058 0.058 0.058 0.058 0.072 0.072 (b) Thiokneas rubber lining, to to to to to to to to to to in 0.040 0.065 0.065 0.065 0.072 0.072 0.072 0.072 0.072 0.095 0.095 to 400 300 400 300 400 400 400 400 400 400 0.065 (c) Test pressure on every 600 500 600 500 600 600 600 600 600 600 length, lb per sq in 300 300 250 300 250 300 300 250 250 250 250 (d) Bursting test pressure 9 13 9 13 9 9 9 9 9 9 50 29 25 15 15 15 1& 15 15 (3-f~ samples) lb per 29 7 4 sq m 500 none 29 none 40 none none none none none none (e) Kink tea~ pressure, lb per sq m 250 42 58 7o 86 93 115 135 (f) ElongatiOn, per cent 13 (o) Twist, deg per ft 50 400 300 400 300 400 400 400 113 400 400 (h) Rise, in 7 (i) Weight, min., lb 21 400 Weight, max., lb (j) Test pressure marking, lb per sq in 300 II PHYSICAL PROPERTIES AND TESTS 6 The tests necessary to determine the physical properties which Standard are prescribed in the following sections shall be made in accordance Methods with the Standard Methods of Testing Rubber Products (Serial Designation: D 15) of the American Society for Testing Materials Sampling 7 A sample not less than 8 in in length shall be taken from each Tests of lot of 500 ft of hose or less for the tests specified in Sections 8 and 9 All test specimens shall be cut transversely from the sample R1u.uu~nbge.r 8 (a) The tensile strength shall be not less than 1600 lb per sq in when tested one month or less from date of final vulcanization, and not less than 1200 lb per sq in when tested more than one month but not over one year from date of final vulcanization (b) The tensile strength after subjection to a dry heat of 158° F (70° C.) ±2° F (1.1 ° C.) for a period of four successive days of 24 hours each shall be not less than 900 lb per sq in This test shall be made within three months from date of final vulcanization 1076 SPECIFICATIONS FOR FIRE HOSE (PRIVATE DEPARTMENT UsE) Friction Test (c) The elongation when rupture occurs in making the tension Hydrostatic test (Paragraph (a) ) shall be such that the original 2-in gage length Pressure shall stret