A-A-52546
2.2 Design and construction. Unless otherwise specified in the AED (see 6.2), the hose shall be design and constructed in accordance with the manufacturers own drawings, specifications and standard practices.
2.3 Performance.
2.3.1 Bending. The hose shall be installed in a contour-forming fixture and subjected to a minimum radius bend of one and a half times the inside hose diameter for each of four separate directions spaced 90 degrees apart. The hose shall evidence no kinking, flattening, fracturing or deformation.
2.3.2 Collapsing resistance. A 15 centimeter (cm) (6 inch) hose sample shall evidence no damage in excess of 5% in diameter after being subjected to a load of 57 kilograms (kg) (125 pounds) uniformly applied for 5 minutes.
2.3.3 Accelerated-aging flexibility. The shall withstand the accelerated-aging test specified in ASTM D573 except the temperature shall be 121 ± 2 degrees Celsius (°C) (250 ± 3.6 degrees Fahrenheit (°F) for a period of 24 ± .5 hours and then -54 ± 1°C (-65 ± 2°F) for a period of 24 hours and flexed while at still latter temperature. After flexing, the hose shall withstand a pulsating proof pressure specified in 2.3.4 without any sign of damage.
2.3.4 Pulsating proof pressure. The sample shall withstand without any damage a pressure of 276 kilopascals (kPa) (40 pounds per square inch (psi)) applied internally at pulsating intervals of 5 seconds “on”, 3 seconds “off” for 15 minutes. Sample shall be prepared in accordance with ASTM D380.
2.3.5 Burst strength. The hose shall show no evidence of bursting or leakage, at any pressure up to and including 517 kPa (75 psi), when subjected to a burst pressure specified in ASTM D380.
2.3.6 Fungus resistance. The hose shall be constructed of materials that will not support fungus growth. The sample shall not show any sign of damage when subjected to fungus growth as described in ASTM D3273 and then subjected to a burst pressure as described in paragraph 2.3.5.
2.3.7 Friction (adhesion). The hose shall withstand a force of at least 53 Newtons (N) (12 pounds), tube to ply. The sample shall be prepared in accordance with ASTM D413.
2.3.8 Resistance to vacuum. A 91.5 cm (36 inch) length of hose shall be assembled with end couplings. The outside diameter of the hose shall be measured and recorded. One end shall be closed in such a manner as to prevent leakage of air, and the other end shall be connected to a
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