UL 2443-2015 pdf download
UL 2443-2015 pdf download.Flexible Sprinkler Hose with Fittings for Fire Protection Service.
11.4 During and after being subjected to the required vibration, the samples are to be examined for signs of leakage, rupture, or movement of the outlet fitting affecting the pertormance of the flexible hose assembly. Each sample is then to be subjected to two times the rated pressure described in the Hydrostatic Pressure arid Leakage Test, Section 8, and observations made for leakage or rupture.
12 Equivalent Length Determination
12.1 When tested as described in 12.2 and 12.3, the pressure loss of flexible hose with fittings, expressed in equivalent length of Schedule 40 pipe in the same nominal size as the inlet connection, shall not be more than the equivalent length values published in the installation instructions.
12.2 A sample of each length shall be tested in straight lengths and with the maximum number of minimum radii bends referenced in the installation instructions. A piezometer is to be installed on both the inlet and outlet of the fittings and connected to a differential pressure measuring device. The water flow through the test sample is to be measured using a flow-measuring device.
12.3 At least five different water flows at velocities between 10 and 18 ftlsec (3.1 and 5.5 m/s) based upon the nominal Inside diameter of the hose are to be established through the test sample and the pressure drop between piezometers at each flow is to be recorded. The calculated pressure loss from the piezometers. corrected for the inlet and outlet velocities, are to be subtracted from the test sample results to obtain a pressure drop for the flexible hose with fitting. Using the Hazen-Williams coefficient of friction of 120. the equivalent length, in feet (m) of pipe, is to be calculated.
13 Salt Spray Corrosion Test
13.1 Ferrous anchoring components not potected with a coating complying with 7.4 shall withstand an exposure to a salt spray atmosphere In accordance with 13.4 for 10 days without exhibiting any Incipient corrosion,
13.2 For the purposes 01 this requirement, the term “Incipient corrosIon” is defined as the first evidence of the destruction of the integrity of the material,
13.3 Three samples of each ferrous part are to be used In this test.
13.4 The samples are to be supported vertically and exposed to salt spray (fog) as specified in the Standard Practice for Operating Salt Spray (Fog) Apparatus. ASTM Bi 17, except that the salt solution is to consist of 20 percent by weight of common salt (sodium chloride).
15.3 The sample is to be placed into a sealed glass chamber that is fitted with a thermometer and a wet condenser. The sealed glass chamber is to be tilled approximately one-hall lull or to a level at least 0.5 inches (1.27 cm) above the test sample with a nominal 44 percent by weight magnesium chloride solution, placed on a thermostatically controlled electrically heated mantel, and maintained at a boiling temperature of 302 ±2°F (150 ±1°C). The sample parts are to be unassembled. The exposure is to Last for 150 hours.
15.4 After the exposure period, the test samples are to be removed from the boiling magnesium chloride solution and rinsed in de-ionized water.
15.5 The test samples are then to be examined using a microscope having a magnification of 25X for any cracking. delamination, or other degradation as a result of the test exposure.
16 Elestomeric Parts Test
16.1 An elastomeric part used to provide a seal shall have the following properties when tested as specified in the Standard for Gaskets and Seals. UL 157:
a) For silicone rubber (having poly-organo-siloxane as its constituent characteristic), a minimum tensile strength of 500 psi (3.4 MPa) and a minimum ultimate elongation of 100 percent.
b) For natural rubber and synthetic rubber other than silicone rubber, a minimum tensile
strength of 1500 psi (10.3 MPa) and minimum ultimate elongation of 150 percent: or a minimum tensile strength of 2200 psi (15.2 MPa) and a minimum ultimate elongation of 100 percent.
c) Those properties relating to maximum tensile set; minimum tensile strength and elongation after oven aging; and hardness after oven aging, all as specified in UL 157. The oven time and temperature for oven aging is to be based upon the intended service temperature referenced in the manufacturer’s instructions, but not less than 60°C (140°F).
16.2 The Standard for Gaskets and Seals. UL 157. provides for the testing of either finished ela.stomeric parts or sheet or slab matenal. Sheet or slab material Is to be tested when the etastomeric pans are 0-rings having diameters of less than 1 inch (25.4 mm). The material tested is to be the same as that used in the product. regardless of whether finished etastomeric parts or sheet or slab material is tested.
