Section R. 29.5659 - General definitionsRule 659. Sections 3.3.21.1, 3.3.64, 3.3.65, and 3.3.66 are added to the FL/CL code:
3.3.21 "Flash point" means the minimum temperature of a liquid at which sufficient vapor is given off to form an ignitable mixture with the air, near the surface of the liquid or within the vessel used, as determined by the appropriate test procedure and apparatus specified in section 4.4. 3.3.21.1 "Flow-through process tank" means a tank that forms an integral part of a production process through which there is a steady, variable, recurring, or intermittent flow of materials during the operation of the process and the tank is utilized to carry out or control the heating, cooling, mixing, blending, separating, metering, or chemical action of materials. The processing is done on a regular basis and it is the primary function of the tank. A flow-through process tank does not include a tank that is used for the storage of materials before its introduction into the production process or for the storage of finished products or byproducts from the production process or a tank that is only used to recirculate materials.3.3.64 "Aboveground storage tank system (AST)" means a tank, or combination of tanks, including the pipes that are connected to the tank(s) or ancillary equipment containment systems, if any, that has less than 10% of its combined volume beneath the surface of the ground. The tank or tanks may presently be in use, or may have been used in the past, to contain an accumulation of liquids.3.3.65 "Tank System" means an AST system or an UST system.3.3.66 "Underground storage tank system (UST)" means a tank, or combination of tanks, including the underground pipes that are connected to the tank or tanks or underground ancillary equipment containment systems, if any, that has 10% or more of its combined volume beneath the surface of the ground. The tank or tanks may presently be in use, or may have been used in the past, to contain an accumulation of liquids.Mich. Admin. Code R. 29.5659