A device designed to contain an accumulation of regulated substance and constructed of non-earthen materials such as concrete, steel, fiberglass or plastic, and including the following types of tanks, which have the following meanings:


a. “Abandoned tank” means an aboveground or underground tank with or without product, that is not recognized by this chapter as in-use, temporarily-out-of-service or closed.


b. “Accumulator tank” or “accumulator reservoir” means a container, integral to the closed-loop mechanical system operation of equipment, that is used to provide product on demand or to store product which is displaced from the functioning equipment, such as an elevator or hydraulic lift.


c. “Breakout tank” means a tank that is used to relieve surges in an oil pipeline system or to receive and store oil transported by a pipeline for re-injection and continued transportation by a pipeline. Tanks considered by this chapter to be breakout tanks do not have piping that transfers product directly to or from a loading rack.


d. “Day tank” means an intermediate tank in a product transfer system between a storage tank and the end use of the product, usually a generator. The purpose of a day tank is to provide immediate product to the end source where the supply may otherwise be influenced by product temperature, viscosity or inadequate supply pressure.


e. “Farm tank” means a tank that is constructed in accordance with NFPA 30A section 13.2 and installed on a farm premises.


f. “Field-erected tank” means a tank that is built on the site from sections and components.


Note: See par. (p) for a definition of “fixed tank.”


g. “Gravity tank” means a supply tank from which the product is delivered directly by gravity.


h. “Integral tank” means a vessel with a liquid capacity of less than 110 gallons, which supplies fuel to an engine and which is assembled and used with the engine as a single unit of equipment.


Note: Vessels with a capacity of 110 gallons or more are included in the definition of storage tank in paragraph (p).


i. “Movable tank” means an aboveground storage tank that meets all of the following:


1. Has a liquid capacity of 110 gallons or more, and is used for storing and dispensing liquid motor vehicle fuel.


2. Is supported on skids, wheels without axles, or similar means and is not mounted upon a tank vehicle or chassis capable of road travel.


3. Is designed and constructed in accordance with s. Comm 10.250.


4. Is not intended for permanent placement.


Note: Movable tanks are acceptable for use at construction projects, farms, and other locations recognized in subchapter VI, where it is more practical to move the tank, typically by lifting equipment, to off-road motorized equipment for dispensing, rather than drive the motorized equipment to the tank.


j. “Multi-compartment tank” or “multi-chamber tank” means a vessel that contains 2 or more compartments created by the presence of an interior wall so that 2 or more substances can be stored at the same time within a single tank shell.


Note: In accordance with section Comm 10.250, each compartment of a multi-compartment tank is considered a separate tank, even if the same substance is stored in more than 1 compartment.


k. “Portable tank” means an aboveground closed vessel that has a liquid capacity of 110 gallons or more; is not otherwise defined in this chapter; is equipped with skids, mountings or accessories to facilitate handling of the tank by mechanical means; and is not intended for fixed installation or for highway vehicle fueling; and includes intermediate bulk containers.


l. “Process tank” or “flow-through process tank”

1. 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.


2. Does not include a tank that is used for the storage of materials before their introduction into the production process or for the storage of finished products or by-products from the production process, or a tank that is only used to recirculate materials. A process tank would be considered a storage tank if the vessel is used as storage for a period exceeding 96 hours after the processing ends.


m. “Product recovery tank” means a tank that forms an integral part of a ch. Comm 10 regulated substance spill control system for a storage, processing or transfer area. The purpose of the tank is spill recovery and temporary containment. A product recovery tank does not include a tank that is used for the storage of materials or by-products from a flow-through reclamation process. A product recovery tank will be considered a storage tank if the vessel is used as storage for a period exceeding 96 hours after the control of a release or spill.


n. “Residential tank” means a tank located on the same property as a 1- or 2-family dwelling or a residential building that falls within the scope of chs. Comm 60 to 66 and used only by the residents of the property or for the maintenance of the property.


o. “Service tank” means a tank that is used for a limited period of time during the servicing of liquid- bearing equipment, to temporarily hold liquids during the servicing, cleaning or relocation of the equipment.


Note: Service tanks are outside the scope of this chapter. Service tanks include the defueling and refueling tanks that are used in commercial aviation environments. These tanks are used for removal of fuel from an aircraft to facilitate other maintenance for the aircraft, and for return of that fuel to the aircraft immediately thereafter. They are typically not moved from one site to another, and are operated by employees of an aviation service company under aviation service protocols and monitored situations.


p. “Stationary tank” or “fixed tank” means a storage vessel intended for stationary installation and not intended for relocation, loading, unloading, or attachment to a transport vehicle, as part of its normal operation in the process of use.


q. “Storage tank” means a liquid-tight vessel that is intended for fixed or stationary use or a tank that is used for fuel dispensing under subch. VI, but is not used for any of the excepted purposes in s. Comm 10.020 (6). This term includes a vessel which has a liquid capacity of 110 gallons or more and which is assembled and used with an engine as a single unit of equipment.


r. “Work-top tank” means an aboveground steel rectangular tank for combined use as a working surface and a storage tank for Class IIIB liquids.