Wisconsin Administrative Code › Department of Natural Resources › NR 400-499 - Environmental Protection - Air Pollution Control › Chapter NR 469 - Emission standards for hazardous air pollutants for halogenated solvent cleaning operations › Section NR 469.02 - Definitions

Current through June 24, 2024
For terms not defined in this section, the definitions
				  contained in chs.
				  NR
				  400 and
				  460 apply to the terms used in
				  this chapter, with definitions in ch. NR 460 taking priority over definitions
				  in ch. NR 400. In addition, the definitions in this section apply to the terms
				  used in this chapter. If this section defines a term which is also defined in
				  ch. NR 400 or 460, the definition in this section applies in this chapter
				  rather than the definition in ch. NR 400 or 460.
(1) "Air blanket" means the layer of air
				inside the solvent cleaning machine freeboard located above the solvent/air
				interface. The centerline of the air blanket is equidistant between the sides
				of the machine.
(1m) "Air knife
				system" means a device that directs forced air at high pressure, high volume or
				a combination of high pressure and high volume through a small opening directly
				at the surface of a continuous web part. The purpose of this system is to
				remove the solvent film from the surfaces of the continuous web part.
(2) "Automated parts handling system" means a
				mechanical device that carries all parts and parts baskets at a controlled
				speed from the initial loading of soiled or wet parts through the removal of
				the cleaned or dried parts. Automated parts handling systems include, but are
				not limited to, hoists and conveyors.
(3) "Batch cleaning machine" means a solvent
				cleaning machine in which individual parts or a set of parts move through the
				entire cleaning cycle before new parts are introduced into the solvent cleaning
				machine. An open-top vapor cleaning machine is a type of batch cleaning
				machine. Solvent cleaning machines, such as ferris wheel cleaners or cross-rod
				degreasers, that clean multiple batch loads simultaneously and are manually
				loaded are batch cleaning machines.
(4) "Carbon adsorber" means a bed of
				activated carbon into which an air-solvent gas-vapor stream is routed and which
				adsorbs the solvent on the carbon.
(5) "Clean liquid solvent" means fresh unused
				solvent, recycled solvent or used solvent that has been skimmed of oils or
				sludge and strained of metal chips or otherwise cleaned of soils.
(6) "Cleaning capacity" means, for a cleaning
				machine without a solvent/air interface, the maximum volume of parts that may
				be cleaned at one time. In most cases, the cleaning capacity is equal to the
				volume (length times width times height) of the cleaning chamber.
(7) "Cold cleaning machine" means any device
				or piece of equipment that contains or uses liquid solvent, into which parts
				are placed to remove soils from the surfaces of the parts or to dry the parts.
				Cleaning machines that contain and use heated, nonboiling solvent to clean the
				parts are classified as cold cleaning machines.
(8) "Colorimetric detector tube" means a
				glass tube, sealed prior to use, containing material impregnated with a
				chemical that is sensitive to one halogenated HAP compound and is designed to
				measure the concentration of that halogenated HAP compound in air.
(8m) "Combined squeegee and air-knife system"
				means a system consisting of a combination of a squeegee system and an
				air-knife system within a single enclosure.
(9) "Consumption" means the amount of
				halogenated HAP solvent added to the solvent cleaning machine.
(9m) "Continuous web cleaning machine" means
				a solvent cleaning machine in which parts such as film, coils, wire and metal
				strips are cleaned at speeds typically in excess of 11 feet per minute. Parts
				are generally uncoiled, cleaned such that the same part is simultaneously
				entering and exiting the solvent application area of the solvent cleaning
				machine and then recoiled or cut. For the purposes of this chapter, all
				continuous web cleaning machines are considered to be a subset of in-line
				solvent cleaning machines.
(10)
				"Cover" means a lid, top or portal cover that shields the solvent cleaning
				machine openings from air disturbances when in place and is designed to be
				easily opened and closed without disturbing the vapor zone. Air disturbances
				include, but are not limited to, lip exhausts, ventilation fans and general
				room drafts. Types of covers include, but are not limited to, sliding,
				biparting and rolltop covers.
(11)
				"Cross-rod solvent cleaning machine" means a batch solvent cleaning machine in
				which parts baskets are suspended from cross-rods as they are moved through the
				machine. In a cross-rod solvent cleaning machine, parts are loaded
				semi-continuously, and enter and exit the machine through a single
				portal.
(12) "Downtime mode" means
				the time period when a solvent cleaning machine is not cleaning parts and the
				sump heating coils, if present, are turned off.
(13) "Dwell" means, for a solvent cleaning
				machine equipped with a superheated vapor system, the technique of holding
				parts within the superheated vapor zone of the solvent cleaning machine. For a
				solvent cleaning machine not equipped with a superheated vapor system, it means
				the technique of holding parts within the freeboard area but above the vapor
				zone of the solvent cleaning machine. Dwell occurs after cleaning to allow
				solvent to drain from the parts or parts baskets back into the solvent cleaning
				machine.
(14) "Dwell time" means
				the required minimum length of time that a part must dwell, as determined by s.
				NR
				469.09(4) or , for a solvent cleaning
				machine equipped with a superheated vapor system, by the manufacturer's
				specifications as required by s.
				NR
				469.06(2) (f) 2.
(15) "Emissions" means the amount of
				halogenated HAP solvent added to the machine, minus the amount of liquid
				halogenated HAP solvent removed from the machine and the amount of halogenated
				HAP solvent removed from the machine in the solid waste.
(16) "Equivalent control method" means an
				equivalent emission control technique or procedure as determined by the
				administrator.
(17) "Existing"
				means any solvent cleaning machine the construction or reconstruction of which
				was commenced on or before November 29, 1993. A machine, the construction or
				reconstruction of which was commenced on or before November 29, 1993, but did
				not meet the definition of a solvent cleaning machine on December 2, 1994
				because it did not use halogenated HAP solvent liquid or vapor covered under
				this chapter to remove soils, becomes an existing source when it commences to
				use those liquid or vapor solvents. A solvent cleaning machine moved within a
				contiguous facility or to another facility under the same ownership,
				constitutes an existing machine.
(18) "Freeboard area" means, for a batch
				cleaning machine, the area within the solvent cleaning machine that extends
				from the solvent/air interface to the top of the solvent cleaning machine. For
				an in-line cleaning machine, it is the area within the solvent cleaning machine
				that extends from the solvent/air interface to the bottom of the entrance or
				exit opening, whichever is lower.
(19) "Freeboard height" means, for a batch
				cleaning machine, the distance from the solvent/air interface, as measured
				during the idling mode, to the top of the cleaning machine. For an in-line
				cleaning machine, it is the distance from the solvent/air interface to the
				bottom of the entrance or exit opening, whichever is lower, as measured during
				the idling mode.
(20) "Freeboard
				ratio" means the ratio of the solvent cleaning machine freeboard height to the
				smaller interior dimension (length, width or diameter) of the solvent cleaning
				machine.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(30) "New" means
				any solvent cleaning machine the construction or reconstruction of which is
				commenced after November 29, 1993.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(41) "Sump" means the part of a solvent
				cleaning machine where the liquid solvent is located.
(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.
(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.
(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.
(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.
(45) "Water layer" means a layer of water
				that floats above the denser solvent and provides control of solvent emissions.
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.
(46) "Working mode"
				means the time period when the solvent cleaning machine is actively cleaning
				parts.
(47) "Working-mode cover"
				means any cover or solvent cleaning machine design that allows the cover to
				shield the cleaning machine openings from outside air disturbances while parts
				are being cleaned in the cleaning machine. A cover that is used during the
				working mode is opened only during parts entry and removal. A cover that meets
				this definition may also be used as an idling-mode cover if that definition is
				also met.