NR 440.62(3)(i)3.a.
a. The owner or operator demonstrates that emissions of purged material resulting from immediate repair are greater than the fugitive emissions likely to result from delay of repair, and
NR 440.62(3)(i)3.b.
b. When repair procedures are effected, the purged material is collected and destroyed or recovered in a control device complying with
par. (j).
NR 440.62(3)(i)4.a.
a. Repair requires the use of a dual mechanical seal system that includes a barrier fluid system, and
NR 440.62(3)(i)4.b.
b. Repair is completed as soon as practicable but not later than 6 months after the leak was detected.
NR 440.62(3)(i)5.
5. Delay of repair beyond a process unit shutdown will be allowed for a valve if valve assembly replacement is necessary during the process unit shutdown, valve assembly supplies have been depleted and valve assembly supplies had been sufficiently stocked before the supplies were depleted. Delay of repair beyond the next process unit shutdown will not be allowed unless the next process unit shutdown occurs sooner than 6 months after the first process unit shutdown.
NR 440.62(3)(j)1.1. Owners or operators of closed vent systems and control devices used to comply with provisions of this section shall comply with the provisions of this paragraph.
NR 440.62(3)(j)2.
2. Vapor recovery systems (for example, condensers and adsorbers) shall be designed and operated to recover the VOC emissions vented to them with an efficiency of 95% or greater, or to an exit concentration of 20 ppm by volume, whichever is less stringent.
NR 440.62(3)(j)3.
3. Enclosed combustion devices shall be designed and operated to reduce the VOC emissions vented to them with an efficiency of 95% or greater, or to an exit concentration of 20 ppm by volume, on a dry basis, corrected to 3% oxygen, whichever is less stringent, or to provide a minimum residence time of 0.75 seconds at a minimum temperature of 816
°C.
NR 440.62(3)(j)5.
5. Owners or operators of control devices used to comply with the provisions of this section shall monitor these control devices to ensure that they are operated and maintained in conformance with their designs.
NR 440.62(3)(j)6.
6. Except as provided in
subds. 8. to
10., each closed vent system shall be inspected according to the following procedures and schedule:
NR 440.62(3)(j)6.a.
a. If the vapor collection system or closed vent system is constructed of hard-piping, the owner or operator shall do the following:
1) Conduct an initial inspection according to the procedures in sub. (6) (b).
2) Conduct annual inspections for visible, audible or olfactory indications of leaks.
NR 440.62(3)(j)6.b.
b. If the vapor collection system or closed vent system is constructed of ductwork, the owner or operator shall conduct an initial inspection and annual inspections according to the procedures in
sub. (6) (b).
NR 440.62(3)(j)7.
7. Leaks, as indicated by an instrument reading greater than 500 ppm by volume above background or by visual inspections, shall be repaired according to the following, except as provided in subd. 8:
NR 440.62(3)(j)7.a.
a. A first attempt at repair shall be made no later than 5 calendar days after the leak is detected.
NR 440.62(3)(j)7.b.
b. Repair shall be completed no later than 15 calendar days after the leak is detected.
NR 440.62(3)(j)8.
8. Delay of repair of a closed vent system for which leaks have been detected is allowed if the repair is technically infeasible without a process unit shutdown or if the owner or operator determines that emissions resulting from immediate repair would be greater than the fugitive emissions likely to result from delay of repair. Repair of the equipment shall be complete by the end of the next process unit shutdown.
NR 440.62(3)(j)9.
9. If a vapor collection system or closed vent system is operated under a vacuum, it is exempt from the inspection requirements of
subd. 6. a. 1) and b.
NR 440.62(3)(j)10.
10. Any parts of the closed vent system that are designated, as described in
subd. 11. a., as unsafe to inspect are exempt from the inspection requirements of
subd. 6. a. 1) and b. if they comply with the following requirements:
NR 440.62(3)(j)10.a.
a. The owner or operator determines that the equipment is unsafe to inspect because inspecting personnel would be exposed to an imminent or potential danger as a consequence of complying with
subd. 6. a. 1) or b.
NR 440.62(3)(j)10.b.
b. The owner or operator has a written plan that requires inspection of the equipment as frequently as practicable during safe-to-inspect times.
NR 440.62(3)(j)11.
11. Any parts of the closed vent system that are designated, as described in
subd. 12. b., as difficult to inspect are exempt from the inspection requirements of
subd. 6. a. 1) and b. if they comply with the following:
NR 440.62(3)(j)11.a.
a. The owner or operator determines that the equipment cannot be inspected without elevating the inspecting personnel more than 2 meters above a support surface.
NR 440.62(3)(j)11.b.
b. The process unit within which the closed vent system is located becomes an affected facility through
40 CFR 60.14 or
60.15, or the owner or operator designates less than 3.0% of the total number of closed vent system equipment as difficult to inspect.
NR 440.62(3)(j)11.c.
c. The owner or operator has a written plan that requires inspection of the equipment at least once every 5 years.
NR 440.62(3)(j)12.a.
a. Identification of all parts of the closed vent system that are designated as unsafe to inspect, an explanation of why the equipment is unsafe to inspect and the plan for inspecting the equipment.
NR 440.62(3)(j)12.b.
b. Identification of all parts of the closed vent system that are designated as difficult to inspect, an explanation of why the equipment is difficult to inspect and the plan for inspecting the equipment.
NR 440.62(3)(j)12.d.
d. For each inspection conducted in accordance with
sub. (6) (b) during which no leaks are detected, a record that the inspection was performed, the date of the inspection and a statement that no leaks were detected.
NR 440.62(3)(j)12.e.
e. For each inspection conducted in accordance with
subd. 6. a. 2) during which no leaks are detected, a record that the inspection was performed, the date of the inspection and a statement that no leaks were detected.
NR 440.62(3)(j)13.
13. Closed vent systems and control devices used to comply with provisions of this section shall be operated at all times when emissions may be vented to them.
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 Note
Note:
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 H
2O 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 H
2O 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
