UL 852:2008 pdf download – Metallic Sprinkler Pipe for Fire Protection Service.
16A.5 The heptane line burner shall be calibrated m accordance with this section. The total heat release rate Is to be measured using a paramagnetic oxygen analyzer, velocity probe, and a Type K thermocouple or equivalent under a calorimeter having diameter of not less than 25 feet (7.6 m), The instrumentation is to be located m the exhaust duct of the heat release rate calonmeter at a location that minimizes the influence of bends or exhaust devices. The heat release rate measurement system Is to be calibtated u5ing an atomized heptane diffusion burner, The calibration is to be performed using flows of 1, 2, 3 and 4 gem (3.8. 7.6. 11.4 and 15.2 Vmin) of heptane. A burner constructed with Model F •80 30, 70 degree PLP nozzles manufactured by Monarch Nozzle Co. has been found to be acceptable.
16A.6 The fire exposure tests are to be conducted m a room utilizing a ceiling 16 by 16 feet suspended at a height of 8 feet 6 inches above the floo. The room shall have prnvisions fo venting gas around the ceiling penmeter with at least 0.5 m (1.7 ft) on all sides. The pipe sample shall be 15 ft in length and shall be installed on the ceiling so that the top of the pipe is 2 inches (50.8 mm) from the ceiling as indicated in the figures below. The pipe is to be installed In accordance with the manufacturer’s Instructions at the maximum hanger spacing, in line with and directly above the heptane burner. A pipe joint is to be centered above the fire. Thermocouples shall be used to record the air temperature 2 inches (50,8 mm) below the ceiling as shown in Figures 16A.2 and 16A.3.
16k 11 The data from the four thermocouples shall be averaged for each 5 mm duration in each test stage to determine compliance with the temperature requirements in 16A13.
16k 12 The fuel flow is to be started and the heptane spray igeited immediately. The test period is to begin when the spray Is ignited.
16k 13 The fire test will continue for the following duration:
a) Stage 1 is 5 minutes in length and shall have a 5 mm average temperature of 1400— 1600°F (760 — 870°C) (a nominal heptane flow of 1.6 gpni (60 I/mm))
b) Directly following Stage 1. Stage 2 is 5 minutes in length and shall have a 5 mm average temperature of 500 — 700°F (260 — 370°C). The heptane flow shall be decreased to a nominal flow of 0.5 gpm (1.9 Vmin) for this stage.
C) After stage 2. terminate the heptane flow and maintain the water flow for 5 minutes.
d) After 5 minutes terminate the water flow and hydrostatically lest the pipe assembly at rated pressure and examine for leaks.
17 MaterIals Test
17.1 Sample pipe shall be subjected to a chemical analysis and compared to the pipe specifications used by the manufacturer.
17.2 The composition of the pipe material is to be in compliance with the chemical composition requirements of the specification used by the manufacturer.
18 Tensile Test
18,1 Test specimens are to be machined from pipe sidewalls and subjected to yield strength, tensile strength, and elongation tests per the Standard Specifications For Mechanical Testing of Steel Products, ASTM A370, test method or other standards that are applicable to the pipe matenal The values shall comply with the applicable pipe standard.