UL 2167-2021 pdf free download.Water Mist Nozzles for Fire Protection Service.
8 Strainer and Filter
8.1 A nozzle shall be provided with a strainer or filter constructed from corrosion resistant materials. The maximum dimension of an opening in the strainer or filter shall not exceed 80 percent of the smallest orifice diameter being protected. Exception: This requirement does not apply to nozzles having waterpassages at least 5.3 mm (0.21 inch) in diameter. PERFORMANCE
9 General
9.1 Water mist nozzles shall be tested for compliance with one or more of the Fire Tests described in Sections 40 – 47.
9.2 Unless other temperatures are indicated, tests are to be conducted at an ambient temperature of 20 ±5 °C (68 ±9 °F). Fire tests are to be conducted at an ambient temperature of 20 ±10 °C (68 ±18 °F). Fuel temperatures are to be 20 ±10 °C (68 ±18 °F).
9.3 Water mist nozzles normally supplied from a declining pressure or from a high pressure pump system are to be tested at their maximum rated pressure and at their minimum functional pressure, if applicable, as specified in the Manufacturer’s Design and Installation Manual.
9.4 Water delivery delay times associated with water mist systems normally operating at standby pressures or those fitted with open nozzles shall be taken into account when conducting the fire performance tests described in Section 40 – 47.
10 Water Mist Nozzle Requirements
10.1 The tests in Sections 11 – 39 shall be conducted for each type of nozzle. Before testing, precise drawings of parts and the assembly shall be submitted together with the appropriate specifications and a copy of the manufacturer’s design and installation instructions.
10.2 Nozzles shall be tested with all components required by their design and intended installation. 10.3 Before testing, nozzles shall be examined visually with respect to the following points:
a) Marking;
b) Conformity of the nozzles with the manufacturer’s drawings and specifications; and
c) Obvious defects. 11 Exposure Tests On Nozzles Incorporating Polymeric Gaskets
11.1 Nozzles with polymeric seals
11.1.1 A nozzle that incorporates a polymeric material to effect the closure of the orifice shall not leak when exposed to the pressures specified in 11.2 – 11.5, and shall operate at its minimum functional pressure after being exposed, in separate groups of samples, to the exposures specified in 11.2 – 11.5.UL 2167 pdf download.