NR 419.02(7)(7) “Floating roof” means a storage tank cover consisting of a double deck or pontoon single deck, which rests upon and is supported by the petroleum liquid being contained, and is equipped with a closure seal or seals to seal the space between the roof edge and tank wall. The floating roof may be either a covered external floating roof in an open storage tank or an internal floating cover beneath a fixed roof.

NR 419.02(7m)(7m) “Fuel gas system” means the off-site and on-site piping and control system that gathers gaseous streams generated by on-site operations, which may be blended with other sources of gas, and transports the gaseous stream for use as fuel gas in combustion devices or in in-process combustion equipment such as furnaces and gas turbines, either singly or in combination.

NR 419.02(8)(8) “Hydrocarbon” means any organic compound containing carbon and hydrogen.

NR 419.02(8e)(8e) “Individual drain system” means the stationary system used to convey wastewater streams or residuals to a waste management unit or to discharge or disposal. “Individual drain system” includes hard-piping, all process drains and junction boxes, together with their associated sewer lines and other junction boxes, manholes, sumps, and lift stations conveying wastewater streams or residuals. A segregated storm water sewer system, which is a drain and collection system designed and operated for the sole purpose of collecting rainfall runoff at a facility, and which is segregated from all other individual drain systems, is excluded from this definition.

NR 419.02(8m)(8m) “Junction box” means any structure where sewer lines meet with one or more waste streams co-mingled.

NR 419.02(9)(9) “Landfill” has the meaning given in s. NR 500.03.

NR 419.02(10)(10) “Landspreading facility” has the meaning given in s. NR 500.03.

NR 419.02(10g)(10g) “Liquid-mounted seal” means a foam or liquid-filled seal mounted in contact with the liquid between the wall of the storage vessel or waste management unit and the floating roof with the seal mounted continuously around the circumference of the vessel or unit.

NR 419.02(10r)(10r) “Maintenance wastewater” means wastewater generated by the draining of process fluid from components in the process unit into an individual drain system prior to or during maintenance activities. Any generation of wastewater that is routine or is generated by designed manufacturing processes is not maintenance wastewater.

NR 419.02 NoteNote: Examples of activities that can generate maintenance wastewaters include descaling heat exchanger tubing bundles, cleaning distillation column traps, draining low legs and high point bleeds, draining pumps into an individual drain system and draining portions of the process unit for repair.

NR 419.02(11)(11) “Maximum theoretical emissions” means the quantity of VOC emissions that theoretically could be emitted by a stationary source without consideration of control devices based on the design capacity or maximum production capacity of the source and 8,760 hours of operation per year. In determining the maximum theoretical emissions for a source, the design capacity or maximum production capacity shall include the use of necessary coatings and inks with the highest VOC content used in practice by the source. When appropriate, and upon request by the source owner or operator, maximum theoretical emissions may be limited by the imposition of conditions in a federally enforceable permit. Such conditions shall be used in place of design capacity or maximum production capacity in calculating the maximum theoretical emissions for the source and may include, among other things, the establishment of production limitations, capacity limitations, or limitations on the VOC content of coatings or inks, or the hours of operation of any emission source, or a combination of any such limitations. Production or capacity limitations shall be established on the basis of no longer than one month and may allow for averaging for up to 12 consecutive months.

NR 419.02(11m)(11m) “Mechanical shoe seal” means metal sheets that are held vertically against the wall of the storage vessel by springs, weighted levers, or other mechanisms and connected to a floating roof by braces or other means. A flexible coated fabric spans the annular space between the metal sheet and the floating roof.

NR 419.02(12)(12) “Mold” means the matrix in which metal is cast and receives its form.

NR 419.02(12m)(12m) “Oil-water separator” or “organic-water separator” means a waste management unit, used to separate oil or organics from water. An oil-water or organic-water separator consists of not only the separation unit but also the forebay and other separator basins, skimmers, weirs, grit chambers, sludge hoppers, and bar screens that are located directly after the individual drain system and prior to additional treatment units such as an air flotation unit, clarifier, or biological treatment unit.

NR 419.02(13)(13) “Petroleum liquid” means crude petroleum, petroleum, condensate and any finished or intermediate products manufactured or extracted in a petroleum refinery or in a facility which produces oils from tar sands, shale, coal or coke.

NR 419.02(14)(14) “Photochemically reactive organic compounds” means any of the following:

NR 419.02(14b)(14b) “Pressure relief valve” means a valve used only to release an unplanned, non-routine discharge.

NR 419.02(14e)(14e) “Process unit” means the smallest set of process equipment that can operate independently and includes all operations necessary to achieve its process objective.

NR 419.02(14h)(14h) “Process wastewater” means wastewater which, during manufacturing or processing, comes into direct contact with, or results from, the production or use of any raw material, intermediate product, finished product, by-product, or waste product.