UL 299:2018 pdf download

UL 299:2018 pdf download.Dry Chemical Fire Extinguishers.

17.3 A discharge valve, spring, pin and nozzle shall be made of a corrosion resistant material and haveno blow holes, cracks,or other imperfections.See Salt spray corrosion test,Clause 46.
18 Siphon tubes
18.1 A siphon tube shall be constructed of a material that is resistant to the corrosive effects of theextinguishing agent with which it is to be used.
18.2 Press-fit-type joints between the siphon tube, valve, and other mating parts of the discharge systemshall not completely disengage during use.The siphon tube shall be notched,scarfed,or otherwiseprevented from restricting discharge in an unintended manner when the tip of the siphon tube is restingon the bottom of the cylinder. The tip of a nonmetallic siphon tube shall not be displaced from the verticalaxis during assembly.See Servicing tests,Clause 49.
19 Handles and mounting devices
19.1 A hand-portable extinguisher having a gross weight of 1.4 kg (3 lb) or more and having a cylinderdiameter of 75 mm(3 in) or more, shall have a carrying handle and a means for mounting on a wall.Ahandle shall be made of nonferrous metal,austenitic stainless steel,carbon steel protected againstcorrosion, or a polymeric material complying with the Aging tests - polymeric materials, Clause 44.Themounting means shall hold the extinguisher firmly in place.
19.2A side handle or hanger loop shall be located so that the operating instructions face outward whenthe extinguisher is supported by the mounting means.
19.3 A handle shall be a minimum 90 mm (3-1/2 in) long for an extinguisher of 6.8 kg (15.0 lb) or moregross weight and a minimum 75 mm (3 in) long for an extinguisher of less than 6.8 kg (15.0 lb) grossweight.
19.4 There shall be a minimum 25 mm (1 in) clearance between the dome and the carrying handle whenthe handle is in the carrying position.
19.5 A mounting bracket shall not permit the extinguisher to drop to the floor when the strap is opened.The clamp releasing device shall be of a color contrasting with that of the immediate background and shallbe visible,and the method of release shall be obvious when viewing the front of the extinguisher.