UL 80:2004 pdf download – Steel Tanks for Oil-Burner Fuel.
12 Burner-Supply Connection
12.1 A threaded opening not less than 112 inch 0,840 inch (21.34 mm) O.D.J pipe size shall be provided in the bottom of the tank shell for connection of piping supplying fuel to the oil burner. The center of this opening shall be located not more than 3 Inches (76 mm) from the end of the shell, and the opening shall be without internal protections to permit complete drainage. See Figures 10.1 and 10.2. A burner-supply connection shall not be located in a head.
12.2 The bottom shell location is intended to reduce the possibility of water accumulating in the bottom of the tank. A tank, when installed, shall be pitched toward the burner•supply connection with a slope of not less than 1)4 inch per fool (10 mm per 480 mm) of length, as recommended in the Standard of the National Fire Protection Association for the Installation of Oil-Burning Equipment. ANSI.NFPA 31.
13 Protection of Openings
13.1 All pipe connection openings in the tank shall be protected to reduce the risk of damage to the threads and exclude foreign matter while in storage or during transit.
14 Painting
14.1 Unless made of galvanized metal, a tank, after having been tested and found free from leakage, shall be given at least one coat of paint, such as organic alkyd resin, asphalt base, epoxy powder, solvent•based primers. waterborne alkyd enamels, potyurethanes, oven cured polyesters, or similar coatings. on the extenor surface to reduce the risk of atmospheric corrosion during storage at the factory premises and in transit to the installation site.
12 Burner-Supply Connection
12.1 A threaded opening not less than 1/2 inch (0.840 inch (21.34 mm) O.D.J pipe size shall be provided in the bottom of the tank shell for connection of piping supplying fuel to the oil burner. The center of this opening shall be located not more than 3 inches (76 mm) from the end of the shell, and the opening stall be without internal pioiections to permit complete drainage. See Figures 10.1 and 10.2. A burner-supply connechon shall not be located in a head.
12.2 The bottom shell location is intended to reduce the possibility of water accumulating in the bottom of the tank. A tank, when installed, shall be pitched toward the burner-supply connection with a slope of not less than 14 inch per foot (10 mm per 480 mm) of length, as recommended in the Standard of the National Fire Protection Association for the Installation of Oil-Burning Equipment, ANSI/NFPA 31.
13 ProtectIon of Openings
13.1 All pipe connection openings in the tank shall be protected to reduce the risk of damage to the threads and exclude foreign matter while in storage or during transit.
14 Painting
14.1 Unless made of galvanized metal, a tank, after having been tested and found free from leakage, shall be given at least one coat of paint, such as organic alkyd resin, asphalt base, epoxy powder. solvent-based primers. waterborne alkyd enamels, polyurethanes, oven cured polyesters. or similar coatings. on the exterior surface to reduce t he risk of atmospheric corrosion during storage at the lactoi’y premises and in transit to the installation site.
HYDROSTATIC PRESSURE TEST
15 General
15,1 Representative tanks, fully formed with any handles, tank supports, or similar features of production models, shall be tested to demonstrate that the strength of the assembly, the head design. and the welded joints are In accordance with these requirements.
15.2 After being tested as described in this Section, each design of tank shall not rupture or leak when subjected to an internal hydrostatic pressure of 25 psig (172 kPa).