UL 2443-2018 pdf free download

UL 2443-2018 pdf free download.Flexible Sprinkler Hose with Fittings for Fire Protection Service.
18.2 Samples of the minimum and maximum lengths in both straight and maximum number of minimum radii bend configurations shall be subjected to this test. The samples are to be connected to a pressure cycling apparatus, filled with water and vented of all air. The internal pressure is to be cycled 3,000 times from 0 psig (0 kPa) to twice the rated working pressure to 0 psi9 (0 kPa) at an approximate rate of 10 cycles per minute.
18.3 During the pressure cycling, observations are to be made for evidence of leakage or physical damage.
19 Vacuum Test
19.1 Flexible sprinkler hose with fittings shall withstand a vacuum of minus 8.84 psi (minus 61 kPa) without collapse, leakage, or other deterioration of the flexible sprinkler hose and fitting performance characteristics.
19.2 Two straight length samples are to be installed on a manifold and subjected to a vacuum of minus
8.84 psi (minus 61 kPa) for 1 minute. The samples are then to be removed from the manifold, visually
examined for damage, and then subjected to the leakage test at twice the rated working pressure for one
minute.
19.3 The samples then are to be visually examined to verify there is no evidence of mechanical damage.
20 High Pressure Flow Test
20.1 Flexible sprinkler hose with fittings and its anchoring components shall maintain the attached sprinkler in the intended operating position with an upward movement of no more than 0.125 inch, and the hose shall maintain its integrity while the sprinkler discharges water at 90 percent of the rated pressure of the flexible sprinkler hose measured at the hose inlet.
20.2 UNBRAIDED HOSE TYPES: One sample of the minimum length flexible hose with fittings having one 90° bend and two samples of the maximum length flexible hose with fittings. one tested with one 90° minimum radius bend (as close as practical) and one tested at its maximum number of 90° minimum radius bends (as close as practical) in the same plane (see Figure 20.1), shall be fitted with a sprinkler having the largest K-factor intended to be connected to the assembly. See Figure 20.1. The outlet filling is to be installed at the midpoint of the longest span between end brackets permitted in the manufacturer’s installation instructions. After the sprinkler outlet has been secured with the anchoring components, a string potentiometer or similar device is to be positioned to continuously measure the upward movement of the sprinkler outlet. The initial position of the sprinkler outlet is to be measured unpressurized. A pressure of 90 percent of the rated pressure of the flexible sprinkler hose with fittings shall be applied to the hose inlet. The sprinkler is to be operated and the pressure adjusted to maintain 90 percent of the rated pressure for 30 minutes. Subsequent to the initial operation of the sprinkler, the sustained upward movement of the sprinkler outlet shall be measured and compared to the initial position of the sprinkler outlet to determine compliance with 20.1.UL 2443-2018 pdf free download.