Wisconsin Administrative Code › Department of Natural Resources › NR 600-699 - Environmental Protection - Hazardous Waste Management › Chapter NR 661 - Hazardous Waste Identification And Listing › Subchapter AA - Air Emission Standards for Process Vents › Section NR 661.1031 - Definitions

Current through June 24, 2024
As used in this subchapter:
(1) "Air stripping operation" means a
				  desorption operation employed to transfer one or more volatile components from
				  a liquid mixture into a gas or air either with or without the application of
				  heat to the liquid. Packed towers, spray towers, and bubble-cap, sieve, or
				  valve-type plate towers are among the process configurations used for
				  contacting the air and a liquid.
(2) "Bottoms receiver" means a container or
				  tank used to receive and collect the heavier bottoms fractions of the
				  distillation feed stream that remain in the liquid phase.
(3) "Closed-vent system" means a system that
				  is not open to the atmosphere and that is composed of piping, connections, and,
				  if necessary, flow-inducing devices that transport gas or vapor from a piece or
				  pieces of equipment to a control device.
(4) "Condenser" means a heat-transfer device
				  that reduces a thermodynamic fluid from its vapor phase to its liquid
				  phase.
(5) "Connector" means
				  flanged, screwed, welded, or other joined fittings used to connect 2 pipelines
				  or a pipeline and a piece of equipment. For the purposes of reporting and
				  recordkeeping, "connector" means flanged fittings that are not covered by
				  insulation or other materials that prevent location of the fittings.
(6) "Continuous recorder" means a
				  data-recording device recording an instantaneous data value at least once every
				  15 minutes.
(7) "Control device"
				  means an enclosed combustion device, vapor recovery system, or flare. Any
				  device whose primary function is the recovery or capture of solvents or other
				  organics for use, reuse, or sale, such as a primary condenser on a solvent
				  recovery unit, is not a control device.
(8) "Control device shutdown" means the
				  cessation of operation of a control device for any purpose.
(9) "Distillate receiver" means a container
				  or tank used to receive and collect liquid material, condensed, from the
				  overhead condenser of a distillation unit and from which the condensed liquid
				  is pumped to larger storage tanks or other process units.
(10) "Distillation operation" means an
				  operation, either batch or continuous, separating one or more feed streams into
				  2 or more exit streams, each exit stream having component concentrations
				  different from those in the feed streams. The separation is achieved by the
				  redistribution of the components between the liquid and vapor phase as they
				  approach equilibrium within the distillation unit.
(11) "Double block and bleed system" means 2
				  block valves connected in series with a bleed valve or line that can vent the
				  line between the 2 block valves.
(12) "Equipment" means each valve, pump,
				  compressor, pressure relief device, sampling connection system, open-ended
				  valve or line, or flange or other connector, and any control devices or systems
				  required by this subchapter.
(13)
				  "Flame zone" means the portion of the combustion chamber in a boiler occupied
				  by the flame envelope.
(14) "Flow
				  indicator" means a device that indicates whether gas flow is present in a vent
				  stream.
(15) "First attempt at
				  repair" means to take rapid action for the purpose of stopping or reducing
				  leakage of organic material to the atmosphere using best practices.
(16) "Fractionation operation" means a
				  distillation operation or method used to separate a mixture of several volatile
				  components of different boiling points in successive stages, each stage
				  removing from the mixture some proportion of one of the components.
(17) "Hazardous secondary material management
				  unit shutdown" means a work practice or operational procedure that stops
				  operation of a hazardous secondary material management unit or part of a
				  hazardous secondary material management unit. An unscheduled work practice or
				  operational procedure that stops operation of a hazardous secondary material
				  management unit or part of a hazardous secondary material management unit for
				  less than 24 hours is not a hazardous secondary material management unit
				  shutdown. The use of spare equipment and technically feasible bypassing of
				  equipment without stopping operation are not hazardous secondary material
				  management unit shutdowns.
(18)
				  "Hot well" means a container for collecting condensate as in a steam condenser
				  serving a vacuum-jet or steam-jet ejector.
(19) "In gas or vapor service" means that the
				  piece of equipment contains or contacts a hazardous secondary material stream
				  that is in the gaseous state at operating conditions.
(20) "In heavy liquid service" means that the
				  piece of equipment is not in gas or vapor service or in light liquid
				  service.
(21) "In light liquid
				  service" means that the piece of equipment contains or contacts a material
				  stream where the vapor pressure of one or more of the organic components in the
				  stream is greater than 0.3 kilopascals or kPa at 20°C, the total
				  concentration of the pure organic components having a vapor pressure greater
				  than 0.3 kPa at 20°C is equal to or greater than 20 percent by weight, and
				  the fluid is a liquid at operating conditions.
(22) "In situ sampling systems" means
				  nonextractive samplers or in-line samplers.
(23) "In vacuum service" means that equipment
				  is operating at an internal pressure that is at least 5 kPa below ambient
				  pressure.
(24) "Malfunction" means
				  any sudden failure of a control device or a hazardous secondary material
				  management unit or failure of a hazardous secondary material management unit to
				  operate in a normal or usual manner, so that organic emissions are
				  increased.
(25) "Open-ended valve
				  or line" means any valve, except pressure relief valves, having one side of the
				  valve seat in contact with hazardous secondary material and one side open to
				  the atmosphere, either directly or through open piping.
(26) "Pressure release" means the emission of
				  materials resulting from the system pressure being greater than the set
				  pressure of the pressure relief device.
(27) "Process heater" means a device that
				  transfers heat liberated by burning fuel to fluids contained in tubes,
				  including all fluids except water that are heated to produce steam.
(28) "Process vent" means any open-ended pipe
				  or stack that is vented to the atmosphere either directly, through a
				  vacuum-producing system, or through a tank, such as distillate receiver,
				  condenser, bottoms receiver, surge control tank, separator tank, or hot well,
				  associated with hazardous secondary material distillation, fractionation,
				  thin-film evaporation, solvent extraction, or air or steam stripping
				  operations.
(29) "Repaired" means
				  that equipment is adjusted, or otherwise altered, to eliminate a
				  leak.
(30) "Sampling connection
				  system" means an assembly of equipment within a process or material management
				  unit used during periods of representative operation to take samples of the
				  process or material fluid. Equipment used to take non-routine grab samples is
				  not considered a sampling connection system.
(31) "Sensor" means a device that measures a
				  physical quantity or the change in a physical quantity, such as temperature,
				  pressure, flow rate, pH, or liquid level.
(32) "Separator tank" means a device used for
				  separation of 2 immiscible liquids.
(33) "Solvent extraction operation" means an
				  operation or method of separation in which a solid or solution is contacted
				  with a liquid solvent, the 2 being mutually insoluble, to preferentially
				  dissolve and transfer one or more components into the solvent.
(34) "Startup" means the setting in operation
				  of a hazardous secondary material management unit or control device for any
				  purpose.
(35) "Steam stripping
				  operation" means a distillation operation in which vaporization of the volatile
				  constituents of a liquid mixture takes place by the introduction of steam
				  directly into the charge.
(36)
				  "Surge control tank" means a large-sized pipe or storage reservoir sufficient
				  to contain the surging liquid discharge of the process tank to which it is
				  connected.
(37) "Thin-film
				  evaporation operation" means a distillation operation that employs a heating
				  surface consisting of a large diameter tube that may be either straight or
				  tapered, horizontal or vertical. Liquid is spread on the tube wall by a
				  rotating assembly of blades that maintain a close clearance from the wall or
				  actually ride on the film of liquid on the wall.
(38) "Vapor incinerator" means any enclosed
				  combustion device that is used for destroying organic compounds and does not
				  extract energy in the form of steam or process heat.
(39) "Vented" means discharged through an
				  opening, typically an open-ended pipe or stack, allowing the passage of a
				  stream of liquids, gases, or fumes into the atmosphere. The passage of liquids,
				  gases, or fumes is caused by mechanical means such as compressors or
				  vacuum-producing systems or by process-related means such as evaporation
				  produced by heating and not caused by tank loading and unloading, working
				  losses, or by natural means such as diurnal temperature changes.