NR 469.02(21) (21) “Freeboard refrigeration device”, also called a chiller, means a set of secondary coils mounted in the freeboard area that carries a refrigerant or other chilled substance to provide a chilled air blanket above the solvent vapor. A primary condenser capable of meeting the requirements of s. NR 469.06 (2) (a) is defined as both a freeboard refrigeration device and a primary condenser for the purposes of this chapter.

NR 469.02(22) (22) “Hoist” means a mechanical device that carries the parts basket and the parts to be cleaned from the loading area into the solvent cleaning machine and to the unloading area at a controlled speed. A hoist may be operated by controls or may be programmed to cycle parts through the cleaning cycle automatically.

NR 469.02(23) (23) “Idling mode” means the time period when a solvent cleaning machine is not actively cleaning parts and the sump heating coils, if present, are turned on.

NR 469.02(24) (24) “Idling-mode cover” means any cover or solvent cleaning machine design that allows the cover to shield the cleaning machine openings during the idling mode. A cover that meets this definition may also be used as a working-mode cover if that definition is also met.

NR 469.02(25) (25) “Immersion cold cleaning machine” means a cold cleaning machine in which the parts are immersed in the solvent when being cleaned. A remote reservoir cold cleaning machine that is also an immersion cold cleaning machine is considered an immersion cold cleaning machine for purposes of this chapter.

NR 469.02(26) (26) “In-line cleaning machine” or “continuous cleaning machine” means a solvent cleaning machine that uses an automated parts handling system, typically a conveyor, to automatically provide a continuous supply of parts to be cleaned. These units are fully enclosed except for the conveyor inlet and exit portals. In-line cleaning machines may be either cold or vapor cleaning machines.

NR 469.02(27) (27) “Leak-proof coupling” means a threaded or other type of coupling that prevents solvents from leaking during the filling or draining of solvent to and from the solvent cleaning machine.

NR 469.02(28) (28) “Lip exhaust” means a device installed at the top of the opening of a solvent cleaning machine that draws in air and solvent vapor from the freeboard area and ducts the air and vapor away from the solvent cleaning area.

NR 469.02(29) (29) “Monthly reporting period” means any calendar month in which the owner or operator of a solvent cleaning machine is required to calculate and report the solvent emissions from each solvent cleaning machine.

NR 469.02(30) (30) “New” means any solvent cleaning machine the construction or reconstruction of which is commenced after November 29, 1993.

NR 469.02(31) (31) “Open-top vapor cleaning machine” means a batch solvent cleaning machine that has its upper surface open to the air and boils solvent to create solvent vapor used to clean or dry parts.

NR 469.02(32) (32) “Part” means any object that is cleaned in a solvent cleaning machine. Parts include discrete parts, assemblies, sets of parts and parts cleaned in a continuous web cleaning machine, including continuous sheets of metal or film.

NR 469.02(33) (33) “Primary condenser” means a series of circumferential cooling coils on a vapor cleaning machine through which a chilled substance is circulated or recirculated to provide continuous condensation of rising solvent vapors and, thereby, create a concentrated solvent vapor zone.

NR 469.02(34) (34) “Reduced room draft” means decreasing the flow or movement of air across the top of the freeboard area of the solvent cleaning machine to meet the specifications of s. NR 469.06 (2) (b). Methods of achieving a reduced room draft include, but are not limited to, redirecting fans or air vents to not blow across the cleaning machine, moving the cleaning machine to a corner where there is less room draft, and constructing a partial or complete enclosure around the cleaning machine.

NR 469.02(35) (35) “Remote reservoir cold cleaning machine” means any device in which liquid solvent is pumped to a sink-like work area that drains solvent back into an enclosed container while parts are being cleaned, allowing no solvent to pool in the work area.

NR 469.02(35m) (35m) “Remote reservoir continuous web cleaning machine” means a continuous web cleaning machine in which there is no exposed solvent sump. In these units, the solvent is pumped from an enclosed chamber and is typically applied to the continuous web part through a nozzle or series of nozzles. The solvent then drains from the part and is collected and recycled through the machine, allowing no solvent to pool in the work or cleaning area.

NR 469.02(36) (36) “Soils” means contaminants that are removed from the parts being cleaned. Soils include, but are not limited to, grease, oils, waxes, metal chips, carbon deposits, fluxes and tars.

NR 469.02(37) (37) “Solvent/air interface” means, for a vapor cleaning machine, the location of contact between the concentrated solvent vapor layer and the air. This location of contact is defined as the mid-line height of the primary condenser coils. For a cold cleaning machine, it is the location of contact between the liquid solvent and the air.

NR 469.02(38) (38) “Solvent/air interface area” means, for a vapor cleaning machine, the surface area of the solvent vapor zone that is exposed to the air. For an in-line cleaning machine, it is the total surface area of all the sumps. For a cold cleaning machine, it is the surface area of the liquid solvent that is exposed to the air.

NR 469.02(39) (39) “Solvent cleaning machine” means any device or piece of equipment that uses any halogenated HAP solvent liquid or vapor to remove soils from the surfaces of materials. Types of solvent cleaning machines include, but are not limited to, batch vapor, in-line vapor, in-line cold and batch cold solvent cleaning machines. Buckets, pails and beakers with capacities of 7.6 liters (2 gallons) or less are not considered solvent cleaning machines.

NR 469.02(40) (40) “Solvent vapor zone” means, for a vapor cleaning machine, the area that extends from the liquid solvent surface to the level at which solvent vapor is condensed. This condensation level is defined as the midline height of the primary condenser coils.

NR 469.02(40m) (40m) “Squeegee system” means a system that uses a series of pliable surfaces to remove the solvent film from the surfaces of the continuous web part. These pliable surfaces, called squeegees, are typically made of rubber or plastic media, and need to be periodically replaced to ensure continued proper function.

NR 469.02(41) (41) “Sump” means the part of a solvent cleaning machine where the liquid solvent is located.

NR 469.02(42) (42) “Sump heater coils” means the heating system on a cleaning machine that uses steam, electricity or hot water to heat or boil the liquid solvent.

NR 469.02(42m) (42m) “Superheated part technology” means a system that is part of the continuous web process that heats the continuous web part either directly or indirectly to a temperature above the boiling point of the cleaning solvent. This could include a process step, such as a tooling die that heats the part as it is processed, as long as the part remains superheated through the cleaning machine.

NR 469.02(43) (43) “Superheated vapor system” means a system that heats the solvent vapor, either passively or actively, to a temperature above the solvent’s boiling point. Parts are held in the superheated vapor before exiting the machine to evaporate the liquid solvent on them. Hot vapor recycle is an example of a superheated vapor system.

NR 469.02(44) (44) “Vapor cleaning machine” means a batch or in-line solvent cleaning machine that boils liquid solvent generating solvent vapor that is used as a part of the cleaning or drying cycle.

NR 469.02(45) (45) “Water layer” means a layer of water that floats above the denser solvent and provides control of solvent emissions.

NR 469.02 Note Note: In many cases, the solvent used in batch cold cleaning machines is sold containing the appropriate amount of water to create a water cover.