1.1 These requirements cover special purpose steel aboveground tanks for specific fuels or liquids and/or use applications as indicated for each special purpose tank type, which are intends to address the specific designs, features, limitations, use factors and other unique characteristics of each type. These requirements are not covered by UL 142 for general purpose steel aboveground tanks for flammable and combustible liquids, as each special purpose tank deviates from them by construction, performance and/or markings for the intended use. The basic types of different special purpose tanks covered by this Standard are:
a) Generator base tanks are designed for combined combustible fuel storage and structural support for diesel or turbine engine power generators, and are intended to be installed in accordance with the Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, NFPA 37, or Standard for Emergency and Standby Power Systems, NFPA 110. Generator base tanks are limited to Combustible Class II or III fuels, such as diesel, kerosene, turbine oils or heavy oils. Covered options may include fire resistance, damage resistance and/or tank support evaluations.
b) Work top tanks are designed for combined combustible liquid storage and structural working surface, and are intended to be installed in accordance with NFPA 30, Code for Flammable and Combustible Liquids, NFPA 30A, Code for Motor Fuel Dispensing Facilities and Repair Garages, or NFPA 31, Standard for Installation of Oil-Burning Equipment. Work top tanks are limited to Combustible Class III liquids, such as heavy fuel oils, new/used lube oils, hydraulic/transmission oils, or similar working fluids. Covered options may include racks, shelves and/or tank support evaluations.
c) Lube oil tanks are designed for storage of unused lubricating oils and similar combustible liquids, and are intended to be installed in accordance with NFPA 30, Code for Flammable and Combustible Liquids, NFPA 30A, Code for Motor Fuel Dispensing Facilities and Repair Garages, or NFPA 31, Installation of Oil-Burning Equipment. Lube oil tanks are limited to Combustible Class IIIB oils, such as motor crankcase oils, hydraulic/transmission oils, machine/cutting oils, or similar fluids. Covered options may include dispensing equipment and/or tank support evaluations.
d) Used oil tanks are designed for storage of used lubricating oils and similar combustible liquids, and are intended to be installed in accordance with NFPA 30, Code for Flammable and Combustible Liquids, NFPA 30A, Code for Motor Fuel Dispensing Facilities and Repair Garages, or NFPA 31, Installation of Oil-Burning Equipment. Used oil tanks are limited to Combustible Class IIIB oils, such as motor crankcase oils, hydraulic/transmission oils, machine/cutting oils, or similar fluids. Covered options may include recycling equipment and/or tank support evaluations.
e) Day tanks are designed for a small temporary or backup supply of fuel for engine-driven equipment, such as pumps or generators, and fuel-burning appliances such as furnaces or heaters, or other portable equipment typically used in farm, construction, mining, forestry, or similar applications, and are intended to be installed in accordance with NFPA 30, Code for Flammable and Combustible Liquids, NFPA 30A, Code for Motor Fuel Dispensing Facilities and Repair Garages, NFPA 31, Standard for the Installation of Oil-Burning Equipment, NFPA 37, Installation and Use of Stationary Combustion Engines and Gas Turbines, or NFPA 110, Standard for Emergency and Standby Power Systems. Day Tanks are limited to specific fuels as marked, such as Flammable Class I gasoline or Combustible Class II kerosene, diesel fuel or heating oil. Covered options may include dispensing equipment and/or tank support evaluations.
f) Process Tanks are designed for mixing of different flammable or combustible liquid(s) and/or other materials which are typically added/monitored through a top hatch and dispensed through bottom hose outlets. These smaller tanks have easily removable tops, such as bolted flanges, for frequent cleaning and maintenance, and are intended for installation and use in accordance with NFPA 30, Code for Flammable and Combustible Liquids. Covered options may include attached accessories and equipment, such as pumps, gauges and valves, and/or tank support evaluations.
1.2 All special purpose tanks are atmospheric types, but may be of primary, secondary or diked containment designs; constructed in cylindrical or rectangular shapes; oriented horizontally or vertically, and have additional features or options, as described for each tank type.
1.3 All special purpose tanks are shop fabricated, but may be either completely assembled at the factory, or allow for limited field assembly. However, only the optional accessories which are described in this Standard and have been evaluated to applicable requirements are covered items for each tank type.
1.4 These requirements cover only the accessories, components and features specifically identified in this Standard. Any other accessories or components that are shipped with the tanks, attached to the tanks, or added to the tanks are not included in the scope of the tank evaluation. It is intended that the AHJ approve the use and/or installation of any such accessories or components independent of the evaluated tank.
1.5 For some special purpose tank types, it is expected that generators, engines, pumps or other equipment may be mounted on or connected to the tank. However, these devices are not covered or evaluated by the requirements of this Standard, other than the structural integrity of the tank at rated loads.
1.6 These requirements do not cover portable tanks intended for transporting flammable or combustible liquids (such as by truck, rail, ship or air), or mobile use applications (such as on vehicles or trailers). These types of products are covered by separate UN, DOT, or other specific end product standards.
1.7 These requirements do not cover special evaluations for resistance to hurricanes, tornadoes, earthquakes, floods, or other natural disasters; or fire and damage resistance, except for generator base tank options. However, assessment of any damage for continued use after such events are not included in the evaluation.
1.8 These requirements do not cover general purpose tanks, which are found in the Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids, UL 142, or fuel oil tanks, which are found in the Standard for Steel Tanks for Oil Burner Fuel and Other Combustible Liquids, UL 80.
1.9 The common fuel, oil and other liquid terms referenced in this Standard are intended to be those which are commercially available, and which meet a recognized industry specification, such as ASTM or SAE.