UL 8:2016 pdf free download – STANDARD FOR SAFETY Water Based Agent Fire Extinguishers.
20.6 A wall mounting hook shall require both a horizontal and a minimum 6 mm (1/4 in) vertical motion to remove the extinguisher from the wall.
Exception: A minimum vertical motion of 3 mm (1/8 in) is able to be used for an extinguisher having a gross weight of 5.4 kg (12 Ib) or less.
20.7 When a bracket requires force to open, the force shall not exceed 65 N (15 lb-f) for finger actuated assemblies, and 130 N (30 lb-f) for hand actuated assemblies. See 29.3 and 29.4.
21 Hose Retainers — Wheeled Extinguishers
21.1 A hose retainer shall retain the hose and nozzle on the extinguisher so that neither the hose nor the nozzle strikes or rubs the wheels or the ground. The retainer shall provide for the hose to be installed and withdrawn as intended when the extinguisher is placed in operation.
22 Running Gear — Wheeled Extinguishers
22.1 The cylinder shall be secured to the running gear, consisting of the wheels, axle, cylinder bands, and the handle for hauling and manipulating the extinguisher.
23 Expellant Gases
23.1 The expellant gas used in a stored-pressure extinguisher or in the cartridge or cylinder of an extinguisher so provided shall be compressed air or nitrogen, carbon dioxide, or other inert gas.
23.2 The quantity of the gas charge in a gas cartridge shall not exceed the filling density requirements of DOT or TDGR. Leakage by weighing shall be detectable on a scale graduated in 0.0025 kg (1/8 ) increments, unless other means are provided for detecting leakage.
24 Antiovertill tubes
24.1 An antioverfill tube shall have a minimum inside diameter of 19 mm (3/4 in) and be fabricated of a corrosion-resistant material such as austenitic stainless steel or polymeric material.
24.2 An antioverfill tube shall be constructed so that it forms an airtight joint between the collar and the tube when installed.
24.3 An antioverfill tube shall be removable unless some means other than the fill opening provides access for cleaning out the cylinder.
25 Extinguishing Agent
25.1 To qualify for a Class C rating, water or water based extinguishing agents shall have a maximum conductivity of 1 .00 microsiemen/cm in accordance with the Standard Test Method for Electrical Conductivity and Resistivity of a Flowing High Purity Water Sample, ASTM 5391 and the extinguisher discharge shall meet the requirements of the Standard for Rating and Fire Testing of Fire Extinguishers, ANSI/UL 71 1/CAN/ULC-S508.
PERFORMANCE
26 General
26.1 For cartridge-operated extinguishers, unless otherwise specified, an interval of 5 seconds is able to elapse after the cartridge is punctured in order that pressure builds up before discharge of the agent is initiated.
27 Fire Tests
27.1 An extinguisher shall comply with the Binational Standard for Rating and Fire Testing of Fire Extinguishers, ANSI/UL 711/ CAN/ULC-S508.
27.2 An extinguisher, charged with its rated capacity and conditioned at the minimum storage and use temperature for 16 hours, shall extinguish a Class B test fire having an area numerically equal to 40 percent of the area of the pan used in the rating of the fire extinguisher.
28 Tamper Indicator and Locking Device Test
28.1 Tamper Indicator
28.1.1 The tamper indicator shall break when subjected to a force of 65 N (15 lb-f) or less. (See 28.1.3)
28.1.2 When the tamper indicator is broken by the action required to start discharge of the extinguisher, or when an internal load is continuously applied to the release mechanism, the force, applied as intended and required to break the tamper indicator and accomplish discharge shall not exceed 130 N (30 lb-f). See
28.2.3.
28.1.3 The tamper indicator in 28.1.1, shall be installed in the intended installation position and pulled in
a manner to determine the break strength of the indicator, with a constantly increasing force not exceeding
130 N (30 lb-f) per minute until the indicator breaks. The maximum breaking load shall be noted.