Title: Flexible hoose.pdf
A fatigue test was conducted on two 6 ft (1830 mm) long Model ASH15D-2025 flexible hoses with a 1/2 in. NPT outlet which was considered representative of all sprinkler hose discussed in this Report. This test was conducted as follows: Two samples were arranged in a U shape with one end fixed in place and the other end attached to an air actuated piston in the vertical orientation. The ends of the hose were arranged at a horizontal distance of 16 in. (406 mm) apart. A piston was set to travel 4 inches (102 mm) above and 4 inches (102 mm) below the horizontal for a total travel of 8 inches (200 mm). The hose samples were filled with water to a pressure of 175 psi (1205 kPa) and cycled up and down a total of 50,000 times where a cycle consists of starting at the bottom, raising 8 inches (203 mm) and lowering 8 inches (203 mm). After completing 50,000 cycles, the samples were pressurized with water to 700 psi (4830 kPa) for five minutes. There was no failure or permanent damage as a result of these tests. This