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AMERICAN NATIONAL STANDARD K61.1-1981 <br /> 4. CONSTRUCTION plies of wire reinforcement, the composition of <br /> the wire shall be a suitable corrosion resistant <br /> 4.1 Inner Tube. The tube shall be made from stainless steel. <br /> synthetic or natural rubber compound, uniform <br /> in quality and thickness and free from injurious <br /> defects. It shall meet the physical requirements 4.3 Cover.•A rubber cover, if used, shall be <br /> of Section 5. The material shall be resistant to uniform in quality and thickness and free from <br /> hardening or other deterioration due totheaction injurious defects. It shall meet the physical <br /> of ammonia. requirements of Section 5. The cover shall be so <br /> compounded or constructed that it will not blister <br /> 4.2 Reinforcement. The reinforcement shall in service, and will be resistant to deterioration <br /> consist of any material not adversely affected by due to the action of ammonia. A gas tight cover <br /> permeating ammonia. The reinforcement shall shall be pricked to relieve pressure buildup <br /> be applied evenly and uniformly, and in such a between inner tube and cover.The cover shall be <br /> way that it will meet the physical requirements resistant to deterioration due to exposure to the <br /> of Section 5. In constructions utilizing a ply or elements. <br /> 5. PHYSICAL TESTS AND REQUIREMENTS <br /> 5.1 Acceptance Tests. A 24 inch(610 mm)sample of each size and type hose,representative of the lot, <br /> shall be selected from each lot manufactured at one time,or from each 25,000 feet,whichever issmaller. <br /> Tests to be run are as follows: <br /> Property Requirements Method of Test - <br /> 5.1.1 Hydrostatic Burst 1750 psi (12.1 MPa) ASTM D380 <br /> Minimum (Straight Burst Test) <br /> 5.1.2 Low Temperature No breaks and no 24 inch long hose conditioned straight 5 <br /> cracks in tube or hours at -40°F (-40°C) then bent within <br /> cover two seconds around a mandrel 12 times <br /> the nominal inside diameter of the hose. <br /> 5.1.3 Tensile Strength <br /> Tube 800 psi (5.5141Pa) min. ASTM D380 <br /> Cover 1200 psi (8.3 MPa) min. ASTM D380 <br /> 5.1.4 Elongation at Break <br /> Vibe 150%min. ASTM D380 <br /> Cover 200%min. ASTM D380 <br /> 5.1.5 Adhesion (only the cover adhesion will apply in constructions having braided wire or woven <br /> wire reinforcing members). <br /> Tube 10 Pounds (1.75 kN/m) ASTM D380 <br /> at all Interfaces <br /> Ply 8 Pounds (1.4 kN/m) ASTM D380 <br /> at all Interfaces <br /> Cover 10 Pounds (1.75 kN/m) ASTM D380 <br /> at all Interfaces <br /> 5.1.6 Air Oven Aging ASTM D573 & ASTM D380 <br /> Cover Only 70 ±;4 hrs. at 212 ±3.6°F (100±2°C) <br /> Tensile Strength 80% Retention <br /> Elongation 50%Retention <br /> 5.1.7 Ozone Resistance No cracking under 7X ASTM D1149. <br /> Cover Only magnification Longitudinal samples approximately 1 <br /> inch (25.4 mm) wide from cover shall be <br /> C mounted in accordance with ASTM D518 <br /> procedure B. Conditioned for 24 hours <br /> and exposed for 70 hours in ozone-100 �f <br /> pphm at.104°F (400C). <br /> 28 <br />