NR 440.62(4)(a)1.1. An owner or operator may elect to comply with an allowable percentage of valves leaking of equal to or less than 2.0%. NR 440.62(4)(a)2.2. The following requirements shall be met if an owner or operator wishes to comply with an allowable percentage of valves leaking: NR 440.62(4)(a)2.a.a. An owner or operator shall notify the department that the owner or operator has elected to comply with the allowable percentage of valves leaking before implementing this alternative standard, as specified in sub. (8) (d). NR 440.62(4)(a)2.b.b. A performance test as specified in subd. 3. shall be conducted initially upon designation, annually, and at other times requested by the department. NR 440.62(4)(a)3.a.a. All valves in gas/vapor and light liquid service within the affected facility shall be monitored within 1 week by the methods specified in sub. (6) (b). NR 440.62(4)(a)3.b.b. If an instrument reading of 10,000 ppm or greater is measured a leak is detected. NR 440.62(4)(a)3.c.c. The leak percentage shall be determined by dividing the number of valves for which leaks are detected by the number of valves in gas/vapor and light liquid service within the affected facility. NR 440.62(4)(a)4.4. Owners and operators who elect to comply with this alternative standard may not have an affected facility with a leak percentage greater than 2.0%. NR 440.62(4)(b)1.a.a. An owner or operator may elect to comply with one of the alternative work practices specified in subd. 2. b. and c. NR 440.62(4)(b)1.b.b. An owner or operator shall notify the department before implementing one of the alternative work practices, as specified in sub. (8) (d). NR 440.62(4)(b)2.a.a. An owner or operator shall comply initially with the requirements for valves in gas/vapor service and valves in light liquid service, as described in sub. (3) (g). NR 440.62(4)(b)2.b.b. After 2 consecutive quarterly leak detection periods with the percent of valves leaking equal to or less than 2.0 an owner or operator may begin to skip 1 of the quarterly leak detection periods for the valves in gas/vapor and light liquid service. NR 440.62(4)(b)2.c.c. After 5 consecutive quarterly leak detection periods with the percent of valves leaking equal to or less than 2.0 an owner or operator may begin to skip 3 of the quarterly leak detection periods for the valves in gas/vapor and light liquid service. NR 440.62(4)(b)2.d.d. If the percent of valves leaking is greater than 2.0 the owner or operator shall comply with the requirements as described in sub. (3) (g) but can again elect to use this subsection. NR 440.62(4)(b)2.e.e. The percent of valves leaking shall be determined by dividing the sum of valves found leaking during current monitoring and valves for which repair has been delayed by the total number of valves subject to the requirements of this paragraph. NR 440.62(4)(b)2.f.f. An owner or operator shall keep a record of the percent of valves found leaking during each leak detection period. NR 440.62 NoteNote: Under 40 CFR 60.484, each owner or operator subject to the provisions of this section may apply to the administrator for determination of equivalence for any means of emission limitation that achieves a reduction in emissions of VOC at least equivalent to the reduction in emissions of VOC achieved by the controls required in this section. Manufacturers of equipment used to control equipment leaks of VOC may apply to the administrator for determination of equivalence for any equivalent means of emission limitation that achieves a reduction in emissions of VOC at least equivalent to the reduction in emissions of VOC achieved by the equipment, design and operational requirements of this section. The administrator will make an equivalence determination according to the provisions of 40 CFR 60.484 (b), (c), (d) and (e). NR 440.62(6)(a)(a) In conducting the performance tests required in s. NR 440.08, the owner or operator shall use as reference methods and procedures the test methods in Appendix A of 40 CFR part 60, incorporated by reference in s. NR 440.17, or other methods and procedures as specified in this subsection, except as provided in s. NR 440.08 (2). NR 440.62(6)(b)(b) The owner or operator shall determine compliance with the standards in subs. (3) and (4) as follows: NR 440.62(6)(b)1.1. Method 21 shall be used to determine the presence of leaking sources. The instrument shall be calibrated before use each day of its use by the procedures specified in Method 21. The following calibration gases shall be used: NR 440.62(6)(b)1.b.b. A mixture of methane or n-hexane and air at a concentration of about, but less than, 10,000 ppm methane or n-hexane. NR 440.62(6)(c)2.2. Method 21 shall be used to determine the background level. All potential leak interfaces shall be traversed as close to the interface as possible. The arithmetic difference between the maximum concentration indicated by the instrument and the background level is compared with 500 ppm for determining compliance. NR 440.62(6)(d)(d) The owner or operator shall test each piece of equipment unless he or she demonstrates that a process unit is not in VOC service, that is, that the VOC content would never be reasonably expected to exceed 10% by weight. For purposes of this demonstration, the following methods and procedures shall be used: NR 440.62(6)(d)1.1. Procedures that conform to the general methods in ASTM E168-92, E169- 93 or E260-96, incorporated by reference in s. NR 440.17 (2) (a) 73., 74. and 75., respectively, shall be used to determine the percent VOC content in the process fluid that is contained in or contacts a piece of equipment. NR 440.62(6)(d)2.2. Organic compounds that are considered by the department to have negligible photochemical reactivity may be excluded from the total quantity of organic compounds in determining the VOC content of the process fluid. NR 440.62(6)(d)3.3. Engineering judgment may be used to estimate the VOC content, if a piece of equipment has not been shown previously to be in service. If the department disagrees with the judgment, subds. 1. and 2. shall be used to resolve the disagreement. NR 440.62(6)(e)(e) The owner or operator shall demonstrate that an equipment is in light liquid service by showing that all the following conditions apply: NR 440.62(6)(e)1.1. The vapor pressure of one or more of the components is greater than 0.3 kPa at 20°C (1.2 in H2O at 68°F). Standard reference texts or ASTM D2879-97, incorporated by reference in s. NR 440.17 (2) (a) 35., shall be used to determine the vapor pressures. NR 440.62(6)(e)2.2. The total concentration of the pure components having a vapor pressure greater than 0.3 kPa at 20°C (1.2 in H2O at 68°F) is equal to or greater than 20% by weight. NR 440.62(6)(f)(f) Samples used in conjunction with pars. (d), (e) and (g) shall be representative of the process fluid that is contained in or contacts the equipment or the gas being combusted in the flare. NR 440.62(6)(g)(g) The owner or operator shall determine compliance with the standards for flares as follows: NR 440.62(6)(g)2.2. A thermocouple or any other equivalent device shall be used to monitor the presence of a pilot flame in the flare. NR 440.62(6)(g)3.3. The maximum permitted velocity for air assisted flares shall be computed using the following equation: where:
Vmax is the maximum permitted velocity, m/sec (ft/sec)
HT is the net heating value of the gas being combusted, MJ/scm (Btu/scf)
K1 is 8.706 m/sec for metric units and 28.56 ft/sec for English units
K2 is 0.7084 m4/(MJ-sec) for metric units and 0.087 ft4/(Btu-sec) for English units
NR 440.62(6)(g)4.4. The net heating value (HT) of the gas being combusted in a flare shall be computed using the following equation: where :
K is a conversion constant, 1.740 x 10-7 (g-mole) (MJ)/(ppm-scm-kcal) for metric units and 4.674 x 10-6 (g-mole) (Btu)/(ppm-scf-kcal) for English units.
Ci is the concentration of sample component “i”, ppm
Hi is the net heat of combustion of sample component “i” at 25°C and 760 mm Hg (77°F and 14.7 psi), kcal/g-mole
NR 440.62(6)(g)5.5. Method 18 and ASTM D2504-88 (reapproved 1993), incorporated by reference in s. NR 440.17 (2) (a) 31., shall be used to determine the concentration of sample component “i”. NR 440.62(6)(g)6.6. ASTM D2382-88 or D4809-95, incorporated by reference in s. NR 440.17 (2) (a) 30. and 61., shall be used to determine the net heat of combustion of component “i” if published values are not available or cannot be calculated. NR 440.62(6)(g)7.7. Method 2, 2A, 2C or 2D, as appropriate, shall be used to determine the actual exit velocity of a flare. If needed, the unobstructed (free) cross- sectional area of the flare tip shall be used. NR 440.62(7)(a)1.1. Each owner or operator subject to the provisions of this section shall comply with the recordkeeping requirements of this subsection. NR 440.62(7)(a)2.2. An owner or operator of more than one affected facility subject to the provisions of this section may comply with the recordkeeping requirements for these facilities in one recordkeeping system if the system identifies each record by each facility. NR 440.62(7)(b)1.1. A weather proof and readily visible identification, marked with the equipment identification number, shall be attached to the leaking equipment. NR 440.62(7)(b)2.2. The identification on a value may be removed after it has been monitored for 2 successive months as specified in sub. (3) (g) 3. and no leak has been detected during those 2 months. NR 440.62(7)(b)3.3. The identification on equipment except on valve may be removed after it has been repaired. NR 440.62(7)(c)(c) When each leak is detected as specified in subs. (3) (b), (c), (g), (h) and (4) (b) the following information shall be recorded in a log and shall be kept for 2 years in a readily accessible location: NR 440.62(7)(c)1.1. The instrument and operator identification numbers and the equipment identification number. NR 440.62(7)(c)2.2. The date the leak was detected and the dates each attempt to repair the leak. NR 440.62(7)(c)4.4. “Above 10,000” if the maximum instrument reading measured by the methods specified in sub. (6) (a) after each repair attempt is equal to or greater than 10,000 ppm. NR 440.62(7)(c)5.5. “Repair delayed” and the reason for the delay if a leak is not repaired within 15 calendar days after discovery of the leak. NR 440.62(7)(c)6.6. The signature of the owner or operator (or designate) whose decision it was that repair could not be affected without a process shutdown. NR 440.62(7)(c)7.7. The expected date of successful repair of the leak if a leak is not repaired within 15 days. NR 440.62(7)(c)8.8. Dates of process unit shutdown that occur while the equipment is unrepaired. NR 440.62(7)(d)(d) The following information pertaining to the design requirements for closed vent systems and control devices described in sub. (3) (j) shall be recorded and kept in a readily accessible location: NR 440.62(7)(d)1.1. Detailed schematics, design specifications and piping and instrumentation diagrams. NR 440.62(7)(d)2.2. The dates and descriptions of any changes in the design specifications. NR 440.62(7)(d)3.3. A description of the parameter or parameters monitored as required in sub. (3) (j) 5., to ensure that control devices are operated and maintained in conformance with their design and an explanation of why that parameter (or parameters) was selected for the monitoring. NR 440.62(7)(d)4.4. Periods when the closed vent systems and control devices required in sub. (3) (b), (c), (d) and (e) are not operated as designed, including periods when a flare pilot light does not have a flame. NR 440.62(7)(e)(e) The following information pertaining to all equipment subject to the requirements in sub. (3) (a) to (j) shall be recorded in a log that is kept in a readily accessible location: NR 440.62(7)(e)1.1. A list of identification numbers for equipment subject to the requirements of this section. NR 440.62(7)(e)3.3. A list of equipment identification numbers for pressure relief devices required to comply with sub. (3) (d).
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Chs. NR 400-499; Environmental Protection – Air Pollution Control
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