UL 80:2007 pdf download – Steel Tanks for Oil-Burner Fuels and Other Combustible Liquids.
13.2 All primary tank top connections shall be of equal size not less than nominal 2 inch [2.375 inch (60.33 mm) O.D.j pipe size. Horizontal tank top connections shall be located along lhe longitudinal centerline.
132 eftechve Mardi 21.2010
13.3 All secondary containment tanks or double bottom tanks shall additionally be provided with a minimum 1 1/4 inch (32 mm) opening in the top of the tank for venting and monitoring of the interstitial space.
13.3 #ffective Mardi 21.2010
14 Bottom Supply or DraIn Conneeflon
14.1 All primary tanks shall have one threaded opening per Figure 12.1 Nos. 70. 71. or 72 not less than nominal 1/2 inch [0.840 inch (2134 mm) OD.) pipe size provided in the tank bottom for field installation of supply or drain piping. A burner-supply or drain connection shall not be located in a head or side,
14.1 ettectwe Mardi 21. 2010
14.2 The center of the supply or drain connection shall be located at the lowest bottom point not more than 3 inches (76 mm) from the head/shell or side’bottom intersection, and shall not have any internal projections to prohibit complete drainage.
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14.3 When secondary containment or double bottom design is used. both shells shall be welded directly to the burner-supply connection fitting.
14.3 ettechve Mardi 21.2010
15 Protection of Openings
15.1 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.
16 Painting
16.1 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 pnmers. waterbome alkyd enamels. polyurethanes, oven cured polyesters, or similar coatings. on the exterior surface to reduce the risk of atmospheric corrosion during storage at the factory premises and in transit to the installation site.
21 Top Load
21.1 The tank and supports on a level surface shall be subjected to a static load of 250 lbs (113 kg) for
1 minute without evidence of permanent deformation or failure of the tank or suppo.1, rolling over, or
tipping over.
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21.2 The load shall be applied to an empty tank by evenly distributing weights or a force to the tank top over an area not greater than 12 inch x 12 inch (31 cm x 31 cm) in the most unfavorable location or locations.
21.2 effective March 21.2010
22 Tank Buoyancy
22.1 The tank, dike and hold down system shall be subjected to a buoyancy force for 1 hour without uplifting or rotating the tank, or other evidence of permanent deformation of the tank oi dike.
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22.2 The buoyancy force shall be applied by filling the dike to maximum capacity with water, with the tank completely empty. Tank legs shall be the minimum length possabe if intended to be field installed.
222 effective March 21.2010
23 HydrostatIc Pressure Test
23.1 After completing all applicable testing per Section 17. the same representative primary and
secondary tank or double bottom tank sample(s) shall be subjected to a hydrostatic pressure of 25 psig
(172 kPa) for 1 minute without leakage, rupture, or tip over. Dike tanks shall be evaluated per Section 22.
Exception: lithe lank is marked per 26.1.2 and instructions are provided per 28.4 for reduced field test pressures, the test pressures in 23.1 shall be reduced to 15 psig (103 kPa).
231 effective March 21.2010
23.2 All air shall be expelled from the tank prior to pressurizing the tank at an even rate between 5 — 10 psig (34.5 — 69.0 kpa) per minute. The pressure gauge shall have minimum 1 psig or 10 kPa graduations and at least a 1 percent accuracy.
232 etIeclive March 21.2010
23.3 When testing a secondary tank or a double bottom tank, the primary tank shall be completely filled with water and plugged prior to pressurizing the annular space.