UL 142A 2021 pdf download – Special Purpose Aboveground Tank for Specific Flammable or Combustible Liquids.
3 Glossary 3.1 For the purposes of this Standard the following definitions apply. 3.2 Aboveground Tank – A storage tank that is intended for installation above grade, at grade or below grade without backfill. 3.3 Atmospheric Tank – A storage tank that has been designed to operate at pressures from minus 0.5 psig to 1.0 psig (minus 3.4 kPa to 6.9 kPa) at the top of the tank. 3.4 Diked Containment – A single wall construction with bottom, sides, and an open or closed top intended to provide secondary containment of aboveground tank(s). The dike area is capable of being monitored for leakage, but can’t be pressurized. 3.5 Diked Containment Tank (Dike Tank) – A primary or secondary containment tank within a steel open or closed dike intended to provide at least 110 percent spill containment of the primary tank(s). Open top dikes do not have covers to prevent precipitation or debris from entering the dike area. Closed top dikes have covers to resist precipitation or debris from entering the dike area. 3.6 Fuel – A flammable or combustible liquid which is commercially available as an energy source for spark ignition or compression ignition engines, generators, turbines, heaters, or similar equipment; and meet appropriate ASTM Fuel Specifications, such as: a) Gasoline – General description of various Flammable Class I petroleum distillates and alcohol blends compliant with ASTM D4814 or ASTM D5798 in a range of E0 to E83 typically used in spark ignition engines. b) Diesel – General description of various Combustible Class II petroleum distillates and biodiesel blends compliant with ASTM D975 or ASTM D7467 in a range of B0 to B20 typically used in compression ignition engines. c) Fuel Oil/Heating Oil – General description of various Combustible Class II petroleum distillates and biodiesel compliant with ASTM D396 in a range of B0-B5 typically used in heating equipment.
3.10 Performance Tests – A complete evaluation conducted on a limited quantity of representative tanks. These tests are intended to verify compliance with all applicable performance requirements in a standard. 3.11 Primary Containment – The ability of a tank design and construction to contain a liquid while in normal use (intended storage). 3.12 Primary Containment Tank (Primary Tank) – The wall of a tank construction that provides primary containment. 3.13 Production Tests – A limited evaluation conducted on each tank prior to shipping. These tests are intended to verify compliance with production requirements in a standard, such as leakage. 3.14 Secondary Containment – The ability of a tank design or construction to contain a liquid only in abnormal use (from primary containment leakage or rupture). 3.15 Secondary Containment Tank (Secondary Tank) – A primary containment aboveground tank contained within a steel secondary containment shell forming an interstitial space to the greater of 330 degrees or 95 percent fill, and which is capable of being pressurized and monitored for leakage from either the interior or exterior walls. 3.16 Special Purpose Tank – A steel aboveground tank covered by the requirements of this Standard, which are intended for specific applications and/or fuels or liquids as indicated by each special purpose tank type.