UL-1821:2015 pdf free download – STANDARD FOR SAFETY Thermoplastic Sprinkler Pipe and Fittings for Fire Protection Service.
13.5 Fire exposure test- vertical piping application
13.5.1 Piping assemblies intended for installation as a vertical supply (riser) without protective materials referenced in 13.1.1, shall comply with the Fire Exposure Tests described in Section 13 except for the following:
a) The riser shall be installed vertically along a wall and horizontally at a ceiling height
representative of the configuration specified in the Installation and Design Manual. Where the design manual allows piping to come up through a basement slab or protrude through the wall at a height less than the height of the steel pan containing the heptane, testing with the piping system vertical riser beginning at the height equal to the steel pan shall be considered
representative;
b) The fire source shall be located along the wall below the vertical riser;
c) Sprinklers shall be located at the maximum distance from the riser specified in the
Installation and Design Manual; and
d) Tests shall be conducted with the piping located at two locations:
1) Vertically along a wall; and
2) Vertically in a corner.
14 Pipe Coefficient of Friction Test
14.1 The Hazen-Williams pipe coefficient of friction (C) is to be determined as specified in 14.2 and 14.3, and shall not be less than the value specified in the installation and design manual.
14.2 A pipe sample, at least 20 feet (6.1 m) long, is to be installed in a friction loss test apparatus. A piezometer is to be installed in each end of the pipe sample and is to be connected to a differential pressure gauge. The water flow through the test sample is to be measured using a flow measuring device.
14.3 At least five different water flows at velocities between 10 and 18 ft/s (3.1 and 5.5 m/s) are to be established through the test sample and the pressure drop between piezometers at each flow is to be recorded. The test is to be repeated with the pipe sample removed from the line and the piezometers coupled together. The pressure drop values obtained are then to be subtracted from the results of the test with the pipe sample in the line to obtain the pressure drop of the pipe samples. The Hazen-Williams coefficient of friction is to then be calculated using the following formula:
15 Fitting Equivalent Length Test
15.1 When tested as described in 15.2 and 15.3, the head loss of fittings, expressed in equivalent length of pipe, shall not be more than 2 equivalent feet (610 equivalent mm) higher than the values published in the installation and design manual.
15.2 Samples of fittings are to be installed in a friction loss test apparatus. A piezometer is to be installed on two outlets of the fittings and connected to a differential pressure gauge. The water flow through the test sample is to be measured using a flow measuring device.
15.3 At least five different water flows at velocities between 10 and 18 ft/sec (3.1 and 5.5 m/s) are to be established through the test sample and the pressure drop between piezometers at each flow is to be recorded. The test is to be repeated with the test fittings removed from the line and the piezometers coupled together. The pressure drop values obtained are to be subtracted from the results of the test with the test fitting to obtain a pressure drop for the fitting. Using the Hazen-Williams coefficient of friction specified for the pipe, the equivalent length, in feet (m) of pipe, is to be calculated.
16 Crush Resistance Test
16.1 After being subjected to the crush resistance test specified in 16.2, representative samples of pipe shall comply with the Leakage and Hydrostatic Pressure Test, Section 24.
16.2 Samples of empty unpressurized pipe are to be placed on top of a 1-5/8 inch (41.3 mm) wide by minimum 1 inch (25.4 mm) high steel material having 0.125 inch (3.17 mm) radius round edges. A load is to be applied to the top of the pipe sample by a metal flat plate attached to a tension-compression machine. The test load is to be increased to 200 pounds-force (890 N) using a crosshead speed of 0.5 in/mm (12.7 mm/mm) and held for 5 minutes.