UL 1821-2015 pdf download
UL 1821-2015 pdf download.Thermoplastic Sprinkler Pipe and Fittings for Fire Protection Service.
17 Stress-Corrosion Cracking of Stainless Steel Parts Test
17,1 Austenitic stainless steel parts shall show no evidence of cracking. delamination, or degradation after being subjected to boiling magnesium chloride solution. See 17.2— 17.5.
Exception: Cracking is allowed when it does not impact the ability of the product to comply with the requirements of this Standard.
172 At least three samples in a representative size without plating or coatings are to be degreased prior to being exposed to the magnesium chloride solution.
17.3 The samples are to be placed into a flask that is fitted with a thermometer and a wet condenser
30-inches (762-mm) long. The flask is to be filled one-halt full with a 42 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 duration of the exposure shall be 150 hours.
17.4 After the exposure period, the test samples are to be removed from the boiling magnesium chloride solution and rinsed in de-ionized water.
17.5 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.
18 Flexural Test
18.1 Representative samples of piping joints shall sustain a bending moment equivalent to twice the weight of the water tilled pipe over twice the hanger spacing distance without kinking. leaking, or other signs ot permanent damage.
18.2 The samples are to be installed using two pipe hangers that are located at twice the maximum spacing specified in the installation and design manual. The pipe joint is to be centered between hangers. The pipe assembly is to be filled with water and pressurized to the rated pressure. A point load of one-halt the weight of the water filled pipe between the hangers Is to be applied to the sample at the center point between the two hangers arid held for 1 minute, See Figure 18.1. A test method using shorter hanger spacings with a corresponding increase in applied load to achieve an equivalent bending moment is also allowed, using the following formula:
19.2 After being subjected to the impact specified in 19.1, representative samples of the pipe in the smallest and largest size for each impact value shall comply with the Leakage and Hydrostatic Pressure Test. Section 24.
20 VibratIon Test
20.1 Pipe and fitting assemblies shall withstand the effects of vibration for 30 hours without deterioration of performance characteristics, Following the vibration test, each test assembly shall comply with the specified requirements in the Leakage and Hydrostatic Pressure Test, Section 24.
20.2 For pipe and fitting sizes greater than nominal 1/2 NPS, representative pipe and lilting arrangements. assembled in accordance with the installation and design manual and consisting of approximately 2 foot (610 mm) lengths of pipe attached to each outlet of a tee, are to be placed horizontally and attached to a vibration table. The pipe branch lines are to be attached to the vibration table on each side of the tee outlets in accordance with the installation and design manual, The side tee outlet branch line is to have a fitting on the end of the branch line pipe and is to be supported with a pipe support located near the end fitting. The pipe support which is most expected to cause pipe damage or abrasion is to be selected based on the type of pipe supports specified in the installation and design manual. The pipe support is to be located at the maximum distance from the end fitting as specified in the installation and design manual and attached to a fixed (nonvibrating) support. A load equivalent to the weight of a 4 foot (1.2 m) length of water-lilled pipe is to hang freely from the fitting located on the end of the side outlet pipe branch line, See Figure 20.1 for the general test arrangement.
