Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 120 - Air Resources › Subchapter 05 - Air Pollution Control › Part 23 - Control of Perchloroethylene Emissions from Dry Cleaning Operations › Section 250-RICR-120-05-23.4 - Definitions

Current through June 14, 2024
A. Unless otherwise expressly defined in this
				  section, the terms used in this regulation shall be defined by reference to
				  Part 0 of this Subchapter (General Definitions). As used in this regulation,
				  the following terms shall, where the context permits, be construed as follows:
1. "Articles" means clothing, garments,
				  textiles, fabrics, leather goods, and similar materials.
2. "Carbon adsorber" means a dry cleaning
				  control system that consists of an inlet for exhaust gases; activated carbon in
				  the form of a fixed bed, cartridge or canister as an adsorbent and an outlet
				  for exhaust gases; and a system to strip or desorb solvent from the saturated
				  adsorbent.
3. "Closed-loop machine"
				  means a dry-to-dry machine that recirculates perchloroethylene-laden vapor
				  through a refrigerated condenser and that does not exhaust to the atmosphere
				  during the drying cycle. A closed-loop machine may allow venting to the ambient
				  air through a local exhaust ventilation system, such as a door fan, after the
				  drying cycle is complete and the machine door is open.
4. "Co-located" means sharing a common wall,
				  floor, or ceiling with a residence or a separately owned business.
5. "Colorimetric detector tube" means a glass
				  tube which is designed to measure the concentration of perchloroethylene in air
				  drawn through the tube and that contains a sorbent material which is
				  impregnated with a chemical that is sensitive to perchloroethylene.
6. "Cool-down" means the portion of the
				  drying cycle that begins when the heating mechanism deactivates. During the
				  cool-down period, the refrigerated condenser continues to reduce the
				  temperature of the air circulating through the drum to reduce the concentration
				  of perchloroethylene in the drum.
7. "Day care center" means any person, firm,
				  corporation, association or agency who, on a regular or irregular basis,
				  receives any child under the age of sixteen (16) years, for the purpose of care
				  and/or supervision, apart from their parent or guardian, for any part of a
				  24-hour day.
8. "Desorption" means
				  the regeneration or stripping of a carbon adsorber of the adsorbed solvent
				  using hot air, steam or other means.
9. "Distillation unit" means a device used to
				  volatilize and recover perchloroethylene from contaminated
				  perchloroethylene.
10. "Diverter
				  valve" means a flow control device that prevents room air from passing through
				  a refrigerated condenser when the door of a dry cleaning machine is
				  open.
11. "Door fan" means a local
				  exhaust ventilation system that pulls room air into the dry cleaning machine
				  when the machine door is open.
12.
				  "Drum" means the rotating cylinder or wheel of the dry cleaning machine that
				  holds the articles being cleaned.
13. "Dry cleaning" means a process used to
				  remove soil, grease, paint and other unwanted substances from articles using
				  perchloroethylene as a solvent.
14.
				  "Dry cleaning control system" means equipment used to reduce the amount of
				  perchloroethylene in an air stream prior to discharge to the
				  atmosphere.
15. "Dry cleaning
				  system" means all equipment, devices or apparatus associated with dry cleaning
				  operations including, but not limited to: dry-to-dry machines; transfer machine
				  systems; perchloroethylene filter and purification systems; perchloroethylene
				  waste holding, treatment and disposal systems; perchloroethylene supply
				  systems; dip tanks; pumps; gaskets, piping, ducting, fittings, valves or
				  flanges that convey liquid perchloroethylene or perchloroethylene-contaminated
				  air; and dry cleaning control systems.
16. "Dry-to-dry machine" means a dry cleaning
				  operation in which washing and drying are performed in the same
				  machine.
17. "Dryer" means a
				  machine used to remove perchloroethylene from articles by tumbling them in a
				  heated air stream.
18. "Drying
				  cycle" means the portion of a dry cleaning machine's operating cycle in which
				  the perchloroethylene remaining in the articles after washing and extraction is
				  actively removed. The drying cycle begins when the heating coils are activated
				  and ends when the machine ceases rotation of the drum.
19. "Drying sensor" means a device that
				  senses the perchloroethylene concentration in the drying air or the liquid
				  solvent recovery rate. The drying sensor automatically extends the drying cycle
				  for a set time beyond the activation point to ensure that the articles are dry
				  before being removed from the machine. Drying sensors include, but are not
				  limited to: infrared analyzers, float switches, and resistance
				  probes.
20. "Exhaust damper" means
				  a flow control device that prevents the air-perchloroethylene gas-vapor stream
				  from exiting the dry cleaning machine and flowing into a carbon adsorber before
				  room air is drawn into the dry cleaning machine.
21. "Filter" means a porous device through
				  which perchloroethylene is passed to remove contaminants in suspension.
				  Examples of filters include, but are not limited to, lint filter (button trap),
				  cartridge filter, tubular filter, regenerative filter, prefilter, polishing
				  filter, and spin disc filter.
22.
				  "Heating coil" means the device used to heat the air stream circulated from the
				  dry cleaning machine drum after perchloroethylene has been condensed from the
				  air stream and before the stream reenters the dry cleaning machine
				  drum.
23. "Muck cooker" means a
				  device for heating material trapped by a filter in a dry cleaning machine for
				  the purpose of driving off perchloroethylene vapors for reclaiming.
24. "Perchloroethylene dry cleaning facility"
				  means a facility engaged in dry cleaning using perchloroethylene. The facility
				  includes, but is not limited to, any dry cleaning system and attendant
				  stacks.
25. "Primary carbon
				  adsorber" means a carbon adsorber used to control process vent emissions from a
				  transfer machine system or a dry-to-dry machine that is not a closed-loop
				  machine.
26. "Reclaimer" means a
				  machine used to remove perchloroethylene from articles by tumbling them in a
				  heated air stream.
27.
				  "Refrigerated condenser" means a dry cleaning control system that removes
				  condensable vapors from a gas-vapor stream by cooling the vapors using a
				  mechanical refrigerated system.
28.
				  "Secondary carbon adsorber" means a carbon adsorber that is designed to further
				  reduce the perchloroethylene concentration in the gas-vapor stream after the
				  stream is cooled by a refrigerated condenser.
29. "Transfer machine system" means a
				  multiple-machine dry cleaning operation in which washing and drying are
				  performed in different machines. Examples include, but are not limited to:
a. A washer and dryer(s);
b. A washer and reclaimer(s); or
c. A dry-to-dry machine and
				  reclaimer(s).
30. "Water
				  separator" means a vessel that uses gravity to physically separate liquid
				  perchloroethylene from liquid water.