Chapter NR 661

NR 661.1031(5) (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.

NR 661.1031(6) (6) “Continuous recorder” means a data-recording device recording an instantaneous data value at least once every 15 minutes.

NR 661.1031(7) (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.

NR 661.1031(8) (8) “Control device shutdown” means the cessation of operation of a control device for any purpose.

NR 661.1031(9) (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.

NR 661.1031(10) (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.

NR 661.1031(11) (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.

NR 661.1031(12) (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.

NR 661.1031(13) (13) “Flame zone” means the portion of the combustion chamber in a boiler occupied by the flame envelope.

NR 661.1031(14) (14) “Flow indicator” means a device that indicates whether gas flow is present in a vent stream.

NR 661.1031(15) (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.

NR 661.1031(16) (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.

NR 661.1031(17) (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.

NR 661.1031(18) (18) “Hot well” means a container for collecting condensate as in a steam condenser serving a vacuum-jet or steam-jet ejector.

NR 661.1031(19) (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.

NR 661.1031(20) (20) “In heavy liquid service” means that the piece of equipment is not in gas or vapor service or in light liquid service.

NR 661.1031(21) (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.

NR 661.1031(22) (22) “In situ sampling systems” means nonextractive samplers or in-line samplers.

NR 661.1031(23) (23) “In vacuum service” means that equipment is operating at an internal pressure that is at least 5 kPa below ambient pressure.

NR 661.1031(24) (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.

NR 661.1031(25) (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.

NR 661.1031(26) (26) “Pressure release” means the emission of materials resulting from the system pressure being greater than the set pressure of the pressure relief device.

NR 661.1031(27) (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.

NR 661.1031(28) (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.

NR 661.1031(29) (29) “Repaired” means that equipment is adjusted, or otherwise altered, to eliminate a leak.

NR 661.1031(30) (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.

NR 661.1031(31) (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.

NR 661.1031(32) (32) “Separator tank” means a device used for separation of 2 immiscible liquids.

NR 661.1031(33) (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.

NR 661.1031(34) (34) “Startup” means the setting in operation of a hazardous secondary material management unit or control device for any purpose.

NR 661.1031(35) (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.

NR 661.1031(36) (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.

NR 661.1031(37) (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.

NR 661.1031(38) (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.

NR 661.1031(39) (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.

NR 661.1031 History History: CR 19-082: cr. Register August 2020 No. 776, eff. 9-1-20.

NR 661.1032 NR 661.1032 Standards: process vents.

NR 661.1032(1) (1) A remanufacturer or other person that stores or treats hazardous secondary material in hazardous secondary material management units with process vents associated with distillation, fractionation, thin-film evaporation, solvent extraction, or air or steam stripping operations managing hazardous secondary material with organic concentrations of at least 10 ppmw shall do one of the following:

NR 661.1032(1)(a) (a) Reduce total organic emissions from all affected process vents at the facility below 1.4 kg/h (3 lb/h) and 2.8 Mg/yr (3.1 tons/yr).

NR 661.1032(1)(b) (b) Reduce, by use of a control device, total organic emissions from all affected process vents at the facility by 95 weight percent.

NR 661.1032(2) (2) If a remanufacturer or other person that stores or treats hazardous secondary material installs a closed-vent system and control device to comply with the provisions of sub. (1) the closed-vent system and control device shall meet the requirements specified in s. NR 661.1033.

NR 661.1032(3) (3) Determinations of vent emissions and emission reductions or total organic compound concentrations achieved by add-on control devices may be based on engineering calculations or performance tests. If performance tests are used to determine vent emissions, emission reductions, or total organic compound concentrations achieved by add-on control devices, the performance tests shall conform with the requirements specified in s. NR 661.1034 (3).

NR 661.1032(4) (4) When a remanufacturer or other person that stores or treats hazardous secondary material and the department do not agree on determinations of vent emissions or emission reductions or total organic compound concentrations achieved by add-on control devices based on engineering calculations, the procedures specified in s. NR 661.1034 (3) shall be used to resolve the disagreement.

NR 661.1032 History History: CR 19-082: cr. Register August 2020 No. 776, eff. 9-1-20.

NR 661.1033 NR 661.1033 Standards: closed-vent systems and control devices.

NR 661.1033(1) (1) A remanufacturer or other person that stores or treats hazardous secondary material in hazardous secondary material management units using closed-vent systems and control devices used to comply with provisions of this part shall comply with the provisions of this section.

NR 661.1033(2) (2) A control device involving vapor recovery, such as a condenser or adsorber, shall be designed and operated to recover the organic vapors vented to it with an efficiency of 95 weight percent or greater unless the total organic emission limits specified in s. NR 661.1032 (1) (a) for all affected process vents can be attained at an efficiency less than 95 weight percent.

NR 661.1033(3) (3) An enclosed combustion device, such as a vapor incinerator, boiler, or process heater, shall be designed and operated to reduce the organic emissions vented to it by 95 weight percent or greater; to achieve a total organic compound concentration of 20 ppmv, expressed as the sum of the actual compounds, not carbon equivalents, on a dry basis corrected to 3 percent oxygen; or to provide a minimum residence time of 0.50 seconds at a minimum temperature of 760°C. If a boiler or process heater is used as the control device, the vent stream shall be introduced into the flame zone of the boiler or process heater.

NR 661.1033(4) (4) 

NR 661.1033(4)(a) (a) A flare shall be designed for and operated with no visible emissions as determined by the methods specified in sub. (5) (a), except for periods not to exceed a total of 5 minutes during any 2 consecutive hours.

NR 661.1033(4)(b) (b) A flare shall be operated with a flame present at all times, as determined by the methods specified in sub. (6) (b) 3.

NR 661.1033(4)(c) (c) A flare shall be used only if the net heating value of the gas being combusted is 11.2 MJ/scm or greater if the flare is steam-assisted or air-assisted; or if the net heating value of the gas being combusted is 7.45 MJ/scm or greater if the flare is non-assisted. The net heating value of the gas being combusted shall be determined by the methods specified in sub. (5) (b).

NR 661.1033 Note Note: 1 megajoule/meter3 [MJ/m3] = 26.8391919932 Btu (IT)/foot3 [Btu/ft3].

NR 661.1033(4)(d) (d)

NR 661.1033(4)(d)1. 1. Except as provided in subs. (4) (d) 2. and 3., a steam-assisted or nonassisted flare shall be designed for and operated with an exit velocity, as determined by the methods specified in sub. (5) (c), less than 18.3 m/s.

NR 661.1033(4)(d)2. 2. A steam-assisted or nonassisted flare designed for and operated with an exit velocity, as determined by the methods specified in sub. (5) (c), equal to or greater than 18.3 m/s but less than 122 m/s is allowed if the net heating value of the gas being combusted is greater than 37.3 MJ/scm.

NR 661.1033(4)(d)3. 3. A steam-assisted or nonassisted flare designed for and operated with an exit velocity, as determined by the methods specified in sub. (5) (c), less than the velocity, Vmax, as determined by the method specified in sub. (5) (d) and less than 122 m/s is allowed.

NR 661.1033(4)(e) (e) An air-assisted flare shall be designed and operated with an exit velocity less than the velocity, Vmax, as determined by the method specified in sub. (5) (e).

NR 661.1033(4)(f) (f) A flare used to comply with this section shall be steam-assisted, air-assisted, or nonassisted.

NR 661.1033(5) (5) 

NR 661.1033(5)(a) (a) Reference Method 22 in 40 CFR part 60, incorporated by reference in s. NR 660.11, shall be used to determine the compliance of a flare with the visible emission provisions of this subchapter. The observation period is 2 hours and shall be used according to Method 22.

NR 661.1033(5)(b) (b) The net heating value of the gas being combusted in a flare shall be calculated using the following equation:

Where:

HT = Net heating value of the sample, MJ/scm; where the net enthalpy per mole of offgas is based on combustion at 25°C and 760 mm Hg, but the standard temperature for determining the volume corresponding to 1 mol is 20°C.

K = Constant, 1.74 x 10-7 (1/ppm) (g mol/scm) (MJ/kcal) where standard temperature for (g mol/scm) is 20°C.

Ci = Concentration of sample component i in ppm on a wet basis, as measured for organics by Reference Method 18 in chapter 60 and measured for hydrogen and carbon monoxide by ASTM D 1946-82, incorporated by reference in s. NR 660.11.

Hi = Net heat of combustion of sample component i, kcal/9 mol at 25°C and 760 mm Hg. The heats of combustion may be determined using ASTM D 2382-83, incorporated by reference in s. NR 660.11, if published values are not available or cannot be calculated.

NR 661.1033(5)(c) (c) The actual exit velocity of a flare shall be determined by dividing the volumetric flow rate, in units of standard temperature and pressure, as determined by Reference Methods 2, 2A, 2C or 2D in appendix A of 40 CFR part 60, incorporated by reference in s. NR 660.11, as appropriate, by the unobstructed, free, cross-sectional area of the flare tip.

NR 661.1033(5)(d) (d) The maximum allowed velocity in m/s, Vmax, for a flare complying with sub. (4) (d) 3. shall be determined by the following equation:

Where:

28.8 = Constant

31.7 = Constant

HT = The net heating value as determined in par. (b).

NR 661.1033(5)(e) (e) The maximum allowed velocity in m/s, Vmax, for an air-assisted flare shall be determined by the following equation:

Where:

8.706 = Constant

0.7084 = Constant

HT = The net heating value as determined in par. (b).

NR 661.1033(6) (6) A remanufacturer or other person that stores or treats hazardous secondary material shall monitor and inspect each control device required to comply with this section to ensure proper operation and maintenance of the control device by implementing all of the following requirements:

NR 661.1033(6)(a) (a) Install, calibrate, maintain, and operate according to the manufacturer’s specifications a flow indicator that provides a record of vent stream flow from each affected process vent to the control device at least once every hour. The flow indicator sensor shall be installed in the vent stream at the nearest feasible point to the control device inlet but before the point at which the vent streams are combined.

NR 661.1033(6)(b) (b) Install, calibrate, maintain, and operate according to the manufacturer’s specifications a device to continuously monitor control device operation as specified below:

NR 661.1033(6)(b)1. 1. For a thermal vapor incinerator, a temperature monitoring device equipped with a continuous recorder. The device shall have an accuracy of ±1 percent of the temperature being monitored in °C or ±0.5 °C, whichever is greater. The temperature sensor shall be installed at a location in the combustion chamber downstream of the combustion zone.

NR 661.1033(6)(b)2. 2. For a catalytic vapor incinerator, a temperature monitoring device equipped with a continuous recorder. The device shall be capable of monitoring temperature at 2 locations and have an accuracy of ±1 percent of the temperature being monitored in °C or ±0.5 °C, whichever is greater. One temperature sensor shall be installed in the vent stream at the nearest feasible point to the catalyst bed inlet and a second temperature sensor shall be installed in the vent stream at the nearest feasible point to the catalyst bed outlet.

NR 661.1033(6)(b)3. 3. For a flare, a heat sensing monitoring device equipped with a continuous recorder that indicates the continuous ignition of the pilot flame.

NR 661.1033(6)(b)4. 4. For a boiler or process heater having a design heat input capacity less than 44 MW, a temperature monitoring device equipped with a continuous recorder. The device shall have an accuracy of ±1 percent of the temperature being monitored in °C or ±0.5 °C, whichever is greater. The temperature sensor shall be installed at a location in the furnace downstream of the combustion zone.

NR 661.1033(6)(b)5. 5. For a boiler or process heater having a design heat input capacity greater than or equal to 44 MW, a monitoring device equipped with a continuous recorder to measure a parameter that indicates good combustion operating practices are being used.