UL 30-2009 pdf download – Metal Safety Cans.
5.8 A pouring spout shall be constructed to reduce the likelihood of spillage during pouring. 5.9 A Type II can shall incorporate a vent valve to permit the free discharge of liquid during a pouring operation. The vent valve shall open and close automatically and simultaneously with the opening and closing of the pouring valve. 5.1 0 An operating part of a can shall be constructed to reduce the likelihood of unintended opening of a valve. 5.1 1 Internal pressure in excess of 5 psig (34 kPa) shall be relieved by overcoming the spring pressure on the pouring- or filling-valve closure, or through an independent pressure-relief device. 5.1 2 Deleted November 30, 2000 6 Tops, Bottoms, and Bodies 6.1 The top, bottom, and body of a can shall be of either: a) Sheet brass, copper, or stainless steel, or b) Sheet steel provided with a corrosion-resistant coating that complies with the requirements in Corrosion-Resistant Coatings, Section 1 5. 6.2 The thickness of sheet metal shall at no point be less than the appropriate value specified in Table 6.1 . 6.3 The thickness of the metal is to be determined by five micrometer readings made at points spaced equally along the edge of the full piece as rolled. Measurements are to be made not less than 3/8 inch (9.5 mm) from a cut edge and not less than 3/4 inch (1 9.1 mm) from a mill edge. For drawn parts, the measurements are to be made after drawing. For painted parts, the thickness is to be measured under the paint. 6.4 The bottom surface of a can shall be recessed at least 1 /8 inch (3.2 mm) above the bottom perimeter of the sidewall to reduce the likelihood of puncturing or abrading the bottom. 6.5 The bottom edge of a can having a nominal capacity of 3 gallons (1 1 .4 L) or more shall be reinforced or shall be provided with a metal support ring. Also, see 1 2.2.
6.6 The support ring mentioned in 6.5 shall: a) Be at least 1 /2 inch (1 3 mm) wide, b) Be at least 0.054 inch (1 .37 mm) thick, c) Project at least 1 /8 inch (3.2 mm) beyond the bottom edge of the can, and d) Be secured in place.