July 1. 1920. 



THE INDIA RUBBER WORLD 



649 



War Department Specifications for Mechanical Rubber Goods— II. 



w 



Dki'aktment Specifications Xo. 333-1-1, referred to 

 in the followinK, were published in The India Rubber 

 WdRLi). January 1, 1920: 



COTTON RUBBER-LINED FIRE HOSE. 



War Department Specification No, 333-1-7 — June 6, 1919. 



General. — (a) This specification covers the requirements for 

 cotton rubber-lined fire hose. 



(b) See War Department Specification No. 333-1-1, headed 

 General Specification for Mechanical Rubber Goods', which is 

 made a part hereof, except in such cases as the provisions below 

 directly conflict. In such cases the word and meaning of this 

 specification will govern. 



Construction. — See General Specifications and following table. 



(a) Shall be made of single or double jacketed cotton cover 

 as may be directed and a rubber lining. 



(b) The cotton cover shall be circular woven, seamless, or one 

 ply or two separate plies as may be specified. Free from foreign 

 matter and imperfections. The filling shall be a high ply yarn 

 and the warp a lower ply yarn. 



(c) The rubber lining shall be uniform throughout, consisting 

 of not less than three calendered sheets lapped at the seam into 

 one solid body, properly vulcanized. It shall be as free from 

 corrugations as is consistent with good practice and not less than 

 0.058-inch in thickness for 2Vi-inch hose and not less than 0.049- 

 inch for IJX-inch throughout, exclusive of backing. 



(d) Fittings. — Each length of hose shall be properly fitted 

 into brass couplings of the following composition : 



Per Cent. 



Copper, not less than 83 



Tin. not less than 5 



Zinc, not more than 7 



Lead, not more than 3 



Note. — 0.5 psr cent charcoal iron may be used if desired. 



All surfaces shall be machine finished except the corrugations 

 in the tail parts. The thickness of metal shall not be less than 

 S/32-inch at any one point. The diameter of the waterway shall 

 be as near 2^ inches as possible and not less than 2;4 inches, 

 being determined by keeping the thickness of metal between the 

 bottom of thread and surface of the waterway not less than S/32- 

 inch. Each 2!^-inch coupling shall be provided with two ex- 

 pansion rings, which shall have smooth, rounded edges and shall 

 be not less than O.OSO and not over 0.0S8-inch in thickness; not 

 less than lyi inches in length and at least ^8-inch shorter than the 

 tailpiece. Each l^/^-inch coupling shall be provided with two ex- 

 pansion rings of suitable size to guarantee satisfactory perform- 

 ance. Two spanner lugs shall be provided 9/16-inch in diameter 

 and 9/16-inch in length for 2>^-inch hose and ^-inch in diameter 

 and 7/16-inch in length for l^-inch hose, both on the swivel 

 and the male end, and shall conform to dimensions, marked with 

 manufacturer's name, month and year of manufacture, and the 

 words "U. S. A." 



(e) Threads. — Shall be standard iron-pipe size for 1^-inch 

 hose and "National Standard" fire-hose thread for 2^-inch size 

 unless otherwise specified in the proposal or order. 



(f) Gaskets. — Three shall be provided with each coupling, 

 one in the swivel and one in each end underneath expansion 

 rings; all exactly fitted, 3/16-inch in thickness, and of the same 

 composition as the rubber tube. 



Branding. — See General Specifications. 



(a) Stenciled in black with indelible ink, letters at least 1 inch 

 high in two places on each length 2 feet from the couplings, with 

 the words "U. S. A. FIRE," manufacturer's name, and date. 



Material. — ^See General Specifications. 



(a) Lining and washers shall contain not less than 35 per cent 

 of fine Para, nor more than 4 per cent sulphur, with the re- 

 mainder suitable dry inorganic mineral fillers. The uses of re- 

 claimed rubber or rubber substitutes will not be permitted. 



Inspection. — See General Specifications. 



(a) From each shipment of 20 lengths or less the inspector 

 may select one length at random, and cut from it a 1-foot section 

 for tests. 



Tests. — See General Specifications and following table. 



(a) Each length of hose with couplings attached shall be sub- 

 jected to pressure test. Twist shall be in a direction to tighten 

 the coupling. Hose shall not leak, sweat, nor rupture the threads 

 cf the cotton cover. 



from 



(b) For physical tests an 8-inch section shall be 

 sample after burst. 



(f) Friction test to be conducted on a specimen V/3 inches 

 long. 



(d) Samples after being subjected to a dry heat of 158 de- 

 grees F., plus or minus 2 degrees, for 96 hours must have a ten- 

 sile strength of at least 900 pounds per square inch. 



(e) Chemical lest shall be made on the tube properly sep- 

 arated from the cover, buffed free of backing and properly pre- 

 pared. The acetone, alcoholic potash, and chloroform extract, 

 ash, and total sulphur together shall not exceed 67 per cent by 

 weight of the total compound. Free sulphur must not exceed 1.25 

 per cent by weight of the total compound. The acetone extract 

 shall not exceed 4 per cent. The alcoholic potash shall not ex- 

 ceed 1.5 per cent. The chloroform extract must not exceed 2 

 per cent. The total sulphur, exclusive of barytes, must not ex- 

 ceed 4 per cent, and the ash shall not be greater than 57 nor less 

 than 50 per cent by weight of the total compound. 



(f) Elongation and twist measurements shall start with hose 

 filled with water at 10 pounds' pressure. 



(g) One length from every 10 shall be given the kinking test, 

 which shall be conducted by kinking the hose 18 inches from 

 one end bv tying the coupling back against the hose. 



(h) A 3-foot section shall be cut from at least one length 

 m every sixty 50-foot lengths for bursting test. 

 Table. 



Size, Inches. 



Twist, degrees per foo 

 Kinking test, mininnm 

 Burst test (3-font sar 



Tensile: 



Before aging, mil 

 After aging, mini 



s, then release. 



Per 



25 



25 



1,600 

 900 

 2-12 



2-10 



25 



GASOLINE HOSE. 



War Department Specification No. 333-1-8— June 6. 1919. 



General.— (a) This specification covers the requirements for 

 hose to be used in conveying gasoline. 



ih) See War Department Specification No. 333-1-1, headed 

 General Specification for Mechanical Rubber Goods', which is 

 made a part hereof, except in such cases as the provisions below 

 directly conflict. In such cases the word and meaning of this 

 specification will govern. 



Construction.— See General Specifications and following 

 Table II. 



(a) Tube when made from rubber sheet shall consist of at 

 least two complete turns, reinforced at lap into one solid body. 



(b) Hose to be made of braided or fabric plies. 



((-) Washers to be made of leather 1/16-inch in thickness. 



Branding. — See General Specifications. 



(a) Use the word "Gasoline." 



Material.— See General Specifications and following Tables I 

 and II. 



(a) Tube, cover and friction, shall contain not less than 2S 

 per cent of fine Para, and not more than 1 per cent free sulphur. 



Inspection. — See General Specifications. 



(a) Inspector may cut at random a three-foot section for 

 each shipment of 1,000 feet or less. 



Tests.— See General Specifications and following Table II. 



(a) A length of hose with couplings attached after having 

 been filled with gasoline for two hours shall withstand a pressure 

 test as in Table II. 



'See "The Indi 

 'Tests shall be 



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