Virginia Administrative Code › Title 9 - ENVIRONMENT › Agency 5 - STATE AIR POLLUTION CONTROL BOARD › Chapter 40 - EXISTING STATIONARY SOURCES › Part II - Emission Standards › Article 47 - Emission Standards for Solvent Metal Cleaning Operations in the NorthernVirginia Volatile Organic Compound Emissions Control Area (Rule 4-47) › Section 9VAC5-40-6830 - Definitions

Current through Register Vol. 40, No. 24, July 15, 2024
A. For the purpose
					 of applying this article in the context of the Regulations for the Control and
					 Abatement of Air Pollution and related uses, the words or terms shall have the
					 meanings given them in subsection C of this section.
B. As used in this article, all terms not
					 defined herein shall have the meanings given them in 9VAC5 Chapter 10
					 (9VAC5-10), unless otherwise required by context.
C. Terms defined.
"Airless cleaning system" means a solvent cleaning
						machine that is automatically operated and seals at a differential pressure of
						0.50 pounds per square inch gauge (psig) or less, prior to the introduction of
						solvent or solvent vapor into the cleaning chamber and maintains differential
						pressure under vacuum during all cleaning and drying cycles.
"Air-tight cleaning system" means a solvent cleaning
						machine that is automatically operated and seals at a differential pressure no
						greater than 0.50 psig, prior to the introduction of solvent or solvent vapor
						into the cleaning chamber and during all cleaning and drying cycles.
"Batch vapor cleaning machine" means a vapor cleaning
						machine in which individual parts or a set of parts move through the entire
						cleaning cycle before new parts are introduced into the cleaning machine. The
						term includes solvent cleaning machines, such as ferris wheel cleaners or cross
						rod machines, that clean multiple loads simultaneously and are manually loaded.
						The term does not include machines that do not have a solvent/air interface,
						such as airless and air-tight cleaning systems.
"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.
"Cold cleaning machine" means a device or piece of
						equipment, containing or using an unheated liquid that contains greater than
						5.0% volatile organic compound or 5.0% hazardous air pollutant (HAP) by weight,
						where parts are placed to remove dirt, grease, oil or other contaminants and
						coatings, from the surfaces of the parts or to dry the parts. The term does not
						include machines that do not have a solvent/air interface, such as airless and
						air-tight cleaning systems.
"Dwell" means holding parts within the freeboard area of
						a solvent cleaning machine but above the solvent vapor zone. Dwell occurs after
						cleaning to allow solvent to drain from the parts or parts baskets back into
						the solvent cleaning machine.
"Dwell time" means the period of time between when a
						parts basket is placed in the vapor zone of a batch vapor or in-line vapor
						cleaning machine and when solvent dripping ceases. Dwell time is determined by
						placing a basket of parts in the vapor zone and measuring the amount of time
						between when the parts are placed in the vapor zone and dripping ceases.
"Freeboard ratio" means for a cold cleaning machine, the
						distance from the liquid solvent to the top edge of the cold cleaning machine
						divided by the width of the cold cleaning machine; for an operating batch vapor
						cleaning machine or an in-line vapor cleaning machine, the distance from the
						top of the solvent vapor layer to the top edge of the vapor cleaning machine
						divided by the width of the vapor cleaning machine.
"Freeboard refrigeration device" means a set of
						secondary coils mounted in the freeboard area of a solvent cleaning machine
						that carries a refrigerant or other chilled substance to provide a chilled air
						blanket above the solvent vapor. A solvent cleaning machine primary condenser
						that is capable of maintaining a temperature in the center of the chilled air
						blanket at not more than 30% of the solvent boiling point is both a primary
						condenser and a freeboard refrigeration device.
"Immersion cold cleaning machine" means a cold cleaning
						machine in which the parts are immersed in the solvent when being
						cleaned.
"In-line vapor cleaning machine" means a vapor cleaning
						machine that uses an automated parts handling system, typically a conveyor, to
						automatically provide a supply of parts to be cleaned. In-line vapor cleaning
						machines are fully enclosed except for the conveyor inlet and exit
						portals.
"Reduced room draft" means decreasing the flow or
						movement of air across the top of the freeboard area of a solvent cleaning
						machine to less than 50 feet per minute (15.2 meters per minute) by methods
						including redirecting fans or air vents, moving a machine to a corner where
						there is less room draft, or constructing a partial or complete
						enclosure.
"Remote reservoir cold cleaning machine" means a machine
						in which liquid solvent is pumped to a sink-like work area that immediately
						drains solvent back into an enclosed container while parts are being cleaned,
						allowing no solvent to pool in the work area.
"Solvent/air interface" means the location of contact
						between the concentrated solvent vapor layer and the air. This location of
						contact is defined as the midline height of the primary condenser coils. For a
						cold cleaning machine, it is the location of contact between the liquid solvent
						and the air.
"Solvent cleaning machine" means a device or piece of
						equipment that uses solvent liquid or vapor to remove contaminants, such as
						dirt, grease, oil, and coatings, from the surfaces of materials. Types of
						solvent cleaning machines include batch vapor cleaning machines, in-line vapor
						cleaning machines, immersion cold cleaning machines, remote reservoir cold
						cleaning machines, airless cleaning systems and air-tight cleaning
						systems.
"Solvent cleaning machine 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.
"Solvent cleaning machine down time" means the period
						when a solvent cleaning machine is not cleaning parts and the sump heating
						coils, if present, are turned off.
"Solvent cleaning machine idle time" means the period
						when a solvent cleaning machine is not actively cleaning parts and the sump
						heating coil, if present, is turned on.
"Solvent metal cleaning operation" means the process of
						cleaning foreign matter from metal surfaces by using solvents, including, but
						not limited to, cold cleaning machines that process metal parts and contain
						more than one liter of volatile organic compounds; batch vapor cleaning
						machines that process metal parts; in-line vapor cleaning machines; and airless
						cleaning machines and air-tight cleaning machines that process metal
						parts.
"Superheated vapor system" means a system that heats the
						solvent vapor to a temperature 10 degrees Farenheit above the solvent's boiling
						point. Parts are held in the superheated vapor before exiting the machine to
						evaporate the liquid solvent on the parts.
"Vapor cleaning machine" means a solvent cleaning
						machine that boils liquid solvent, generating a vapor, or that heats liquid
						solvent that is used as part of the cleaning or drying cycle. The term does not
						include machines that do not have a solvent/air interface, such as airless and
						air-tight cleaning systems.
"Vapor cleaning machine 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 vapor
						zone.
"Vapor up control switch" means a thermostatically
						controlled switch that shuts off or prevents condensate from being sprayed when
						there is no vapor. On in-line vapor cleaning machines the switch also prevents
						the conveyor from operating when there is no vapor.
"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.
Statutory Authority
§ 10.1-1308 of the Code of Virginia; §§
						  110, 111, 123, 129, 171, 172 and 182 of the Clean Air Act, 40 CFR Parts 51 and
						  60.