UL 2167-2021 pdf download – Water Mist Nozzles for Fire Protection Service.
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.
11.2 Corrosive exposures 11.2.1 Three groups, each consisting of five samples, are to be assembled. One group is to be exposed to 20 percent salt spray as specified in 26.5.2, the second to hydrogen sulfide as specified in 26.4.2 and 26.4.3, and the third to carbon dioxide-sulfur dioxide as specified in 26.3.2 and 26.3.3. Each exposure period is to be 30 days. 11.2.2 Following the exposure, each nozzle is to be supplied with water at its minimum functional pressure. Each nozzle is then to be operated by exposing the heat responsive element to a uniform application of heat. The operating parts in contact with polymeric material of each test sample shall operate as intended within 5 seconds. 11.3 Temperature cycling exposure 11.3.1 Five samples are to be exposed to ten temperature cycles, each comprised of a 24-hour exposure to a low temperature of minus 40 °C (minus 40 °F) and a 24-hour exposure to a high temperature of 11 °C (20 °F) below its marked operating temperature or the test temperature in Table 24.1, whichever is lower. 11.3.2 Following the exposures, each nozzle is to be supplied with water at its minimum functional pressure. Each nozzle is then to be operated by exposing the heat responsive element to a uniform application of heat. The operating parts in contact with polymeric material of each test sample shall operate as intended within 5 seconds. 11.4 Hydrocarbon exposure followed by moist air exposure 11.4.1 Two groups consisting of five samples are to be assembled. One group is to have the nozzle inlet exposed to a liquid mixture of saturated hydrocarbon chains ranging from C12 to C17, mixed in equal parts by weight. The second group is to have the nozzle inlet exposed to a solid mixture of saturated hydrocarbon chains ranging from C18 to C25, mixed in equal parts by weight. Sufficient hydrocarbon material is to be placed in the inlet to completely cover the polymeric seal. Both groups of nozzles are then to be conditioned at 21 ±5.6 °C (70 ±10 °F) for a minimum of 72 hours.