UL 852-2008 pdf download – Metallic Sprinkler Pipe for Fire Protection Service.
11 General 11.1 To determine compliance with these requirements, pipe shall be subjected to the performance tests described in Sections 12 – 18, and specified in Table 12.1. 11.2 The number of samples required for investigation varies due to pipe sizes, material, and application. The number of samples required for examination and test are to be determined following a review of detailed drawings, examination of a preliminary sample, or both. 12 Bending Moment Tests 12.1 Sample pipe and joint assembly shall not leak or rupture when subjected to the specified bending moment. During the tests, the assembly is to be pressurized to the rated pressure. 12.2 Sample pipe in each size is to be assembled with a joint representative of the intended application at the center of two lengths of pipe each measuring at least 12 inches (305 mm). With the assembly supported at points located on either side of the center of the joint, a gradually increasing force is to be applied to the center of the coupling until the required bending moment is achieved. See Table 12.1 and Figure 12.1.
16A Fire Test 16A.1 Steel pipe having thickness less than Schedule 5 in accordance with Standard Specification for Black and Hot-Dipped Zinc-Coated (Galvanized) Welded and Seamless Steel Pipe for Fire Protection Use, ASTM A795, Standard Specification for Electric Resistance Welded Steel Pipe, ASTM A1 35, or Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless, ASTM A53, or equivalent, or pipe fabricated of material other than steel, shall withstand the fire exposure specified in 16A.2 – 16A.13 without leakage of the piping material or rupture of the joints or piping material when subjected to the indicated flowing pressures and a post fire exposure hydrostatic test at the rated pressure. 16A.2 For a product type with a size range of analogous design, the smallest diameter pipe and 2 inch size pipe shall be tested. If the entire size range is greater than nominal 2 inch, only the smallest diameter pipe shall be tested. If the entire size range is less than nominal 2 inch, the smallest diameter pipe and largest diameter pipe shall be tested.