NR 440.70(5)(a)(a) Each oil-water separator tank, slop oil tank, storage vessel or other auxiliary equipment subject to the requirements of this section shall be equipped and operated with a fixed roof, which meets the following specifications, except as provided in
par. (d) or in
sub. (11).
NR 440.70(5)(a)1.
1. The fixed roof shall be installed to completely cover the separator tank, slop oil tank, storage vessel or other auxiliary equipment with no separation between the roof and the wall.
NR 440.70(5)(a)2.
2. The vapor space under a fixed roof may not be purged unless the vapor is directed to a control device.
NR 440.70(5)(a)3.
3. If the roof has access doors or openings, such doors or openings shall be gasketed, latched and kept closed at all times during operation of the separator system, except during inspection and maintenance.
NR 440.70(5)(a)4.
4. Roof seals, access doors and other openings shall be checked by visual inspection initially and semiannually thereafter to ensure that no cracks or gaps occur between the roof and wall and that access doors and other openings are closed and gasketed properly.
NR 440.70(5)(a)5.
5. When a broken seal or gasket or other problem is identified, first efforts at repair shall be made as soon as practicable, but not later than 15 calendar days after it is identified, except as provided in
sub. (8).
NR 440.70(5)(b)
(b) Each oil-water separator tank or auxiliary equipment with a design capacity to treat more than 16 liters per second (250 gpm) of refinery wastewater shall, in addition to the requirements in
par. (a), be equipped and operated with a closed vent system and control device, which meet the requirements of
sub. (7), except as provided in
par. (c) or in
sub. (11).
NR 440.70(5)(c)
(c) Each modified or reconstructed oil-water separator tank with a maximum design capacity to treat less than 38 liters per second (600 gpm) of refinery wastewater which was equipped and operated with a fixed roof covering the entire separator tank or a portion of the separator tank prior to May 4, 1987 shall be exempt from the requirements of
par. (b), but shall meet the requirements of
par. (a) or may elect to comply with
par. (c) 1.
NR 440.70(5)(c)1.
1. The owner or operator may elect to comply with the requirements of
par. (a) for the existing fixed roof covering a portion of the separator tank and comply with the requirements for floating roofs in
sub. (11) for the remainder of the separator tank.
NR 440.70(5)(d)
(d) Storage vessels, including slop oil tanks and other auxiliary tanks that are subject to the requirements of
s. NR 440.27,
440.28 or
440.285, are not subject to the requirements of this subsection.
NR 440.70(5)(e)
(e) Slop oil from an oil-water separator tank and oil wastewaters from slop oil handling equipment shall be collected, stored, transported, recycled, reused or disposed of in an enclosed system. Once slop oil is returned to the process unit or is disposed of, it is no longer within the scope of this section. Equipment used in handling slop oil shall be equipped with a fixed roof meeting the requirements of
par. (a).
NR 440.70(5)(f)
(f) Each oil-water separator tank, slop oil tank, storage vessel or other auxiliary equipment that is required to comply with
par. (a) and not
par. (b), may be equipped with a pressure control valve as necessary for proper system operation. The pressure control valve shall be set at the maximum pressure necessary for proper system operation, but such that the valve will not vent continuously.
NR 440.70(6)
(6) Standards: aggregate facility. Anew, modified or reconstructed aggregate facility shall comply with the requirements of
subs. (4) and
(5).
NR 440.70(7)
(7) Standards: closed vent system and control devices. NR 440.70(7)(a)(a) 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 provide a minimum residence time of 0.75 seconds at a minimum temperature of 816
°C (1,500
°F).
NR 440.70(7)(b)
(b) Vapor recovery systems, for example, condensers and absorbers, shall be designed and operated to recover the VOC emissions vented to them with an efficiency of 95% or greater.
NR 440.70(7)(d)
(d) 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 440.70(7)(e)
(e) Closed vent system shall be designed and operated with no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, as determined during the initial and semiannual inspections by the methods specified in
sub. (14).
NR 440.70(7)(f)
(f) Closed vent systems shall be purged to direct vapor to the control device.
NR 440.70(7)(g)
(g) A flow indicator shall be installed on a vent stream to control a control device to ensure that the vapors are being routed to the device.
NR 440.70(7)(h)
(h) All gauging and sampling devices shall be gas-tight except when gauging or sampling is taking place.
NR 440.70(7)(i)
(i) When emissions from a closed system are detected, first efforts at repair to eliminate the emissions shall be made as soon as practicable, but not later than 30 calendar days from the date the emissions are detected, except as provided in
sub. (8).
NR 440.70(8)(a)(a) Delay of repair of facilities that are subject to the provisions of this section will be allowed if the repair is technically impossible without a complete or partial refinery or process unit shutdown.
NR 440.70(8)(b)
(b) Repair of such equipment shall occur before the end of the next refinery or process unit shutdown.
NR 440.70(9)(a)(a) Delay of compliance of modified individual drain systems with ancillary downstream treatment components will be allowed if compliance with the provisions of this section cannot be achieved without a refinery or process unit shutdown.
NR 440.70(9)(b)
(b) Installation of equipment necessary to comply with the provisions of this section shall occur no later than the next scheduled refinery or process unit shutdown.
NR 440.70(10)
(10) Alternative standards for individual drain systems. NR 440.70(10)(a)(a) An owner or operator may elect to construct and operate a completely closed drain system.
NR 440.70(10)(b)
(b) Each completely closed drain system shall be equipped and operated with a closed vent system and control device complying with the requirements of
sub. (7).
NR 440.70(10)(c)
(c) An owner or operator shall notify the department in the report required in
s. NR 440.07 that the owner or operator has elected to construct and operate a completely closed drain system.
NR 440.70(10)(d)
(d) If the owner or operator elects to comply with the provisions of this subsection, then the owner or operator does not need to comply with the provisions of
sub. (4) or
(11) (j) note.
NR 440.70(10)(e)
(e) Sewer lines may not be open to the atmosphere and shall be covered or enclosed in a manner so as to have no visual gaps or cracks in joints, seals or other emission interfaces.
NR 440.70(10)(f)
(f) The portion of each unburied sewer line shall be visually inspected initially and semiannually thereafter for indication of cracks, gaps or other problems that could result in VOC emissions.
NR 440.70(10)(g)
(g) Whenever cracks, gaps or other problems are detected, repairs shall be made as soon as practicable, but not later than 15 calendar days after identification, except as provided in
sub. (8).
NR 440.70(11)
(11) Alternative standards for oil-water separators. NR 440.70(11)(a)(a) An owner or operator may elect to construct and operate a floating roof on an oil-water separator tank, slop oil tank, storage vessel or other auxiliary equipment subject to the requirements of this section which meets the following specifications.
NR 440.70(11)(a)1.
1. Each floating roof shall be equipped with a closure device between the wall of the separator and the roof edge. The closure device is to consist of a primary seal and a secondary seal.
NR 440.70(11)(a)2.
2. The primary seal shall be a liquid-mounted seal or a mechanic shoe seal.
NR 440.70(11)(a)3.
3. A liquid-mounted seal means a foam or liquid-filled seal mounted in contact with the liquid between the wall of the separator and the floating roof. A mechanical shoe seal means a metal sheet held vertically against the wall of the separator by springs or weighted levers and connected by braces to the floating roof. A flexible coated fabric or envelope spans the annular space between the metal sheet and the floating roof.
NR 440.70(11)(a)4.
4. The gap width between the primary seal and the separator wall may not exceed 3.8 cm (1.5 in.) at any point.
NR 440.70(11)(a)5.
5. The total gap area between the primary seal and the separator wall may not exceed 67 cm
2/m (3.2 in
2/ft) of separator wall perimeter.
NR 440.70(11)(a)6.
6. The secondary seal shall be above the primarily seal and cover the annular space between the floating roof and the wall of the separator.
NR 440.70(11)(a)7.
7. The gap width between the secondary seal and the separator wall may not exceed 1.3 cm (0.5 in.) at any point.
NR 440.70(11)(a)8.
8. The total gap area between the secondary seal and the separator wall may not exceed 6.7 cm
2/m (0.32 in
2/ft) of separator wall perimeter.
NR 440.70(11)(b)
(b) The maximum gap width and total gap area shall be determined by the methods and procedures specified in
sub. (14) (d).
NR 440.70(11)(b)1.
1. Measurement of primary seal gaps shall be performed within 60 calendar days after initial installation of the floating roof and introduction of refinery wastewater and once every 5 years thereafter.
NR 440.70(11)(b)2.
2. Measurement of secondary seal gaps shall be performed within 60 calendar days of initial introduction of refinery wastewater and once every year thereafter.
NR 440.70(11)(c)
(c) The owner or operator shall make necessary repairs within 30 calendar days of identification of seals not meeting the requirements listed in
par. (a) 2. and
6.
NR 440.70(11)(d)
(d) Except as provided in
par. (f), each opening in the roof shall be equipped with a gasketed cover, seal or lid, which shall be maintained in a closed position at all times, except during inspection and maintenance.
NR 440.70(11)(e)
(e) The roof shall be floating on the liquid, that is, off the roof supports, at all times except during abnormal conditions, that is, low flow rate.
NR 440.70(11)(f)
(f) The floating roof may be equipped with one or more emergency roof drains for removal of stormwater. Each emergency roof drain shall be fitted with a slotted membrane fabric cover that covers at least 90% of the drain opening area or a flexible fabric sleeve seal.
NR 440.70(11)(g)
(g) Access doors and other openings shall be visually inspected initially and semiannually thereafter to ensure that there is a tight fit around the edges and to identify other problems that could result in VOC emissions.
NR 440.70(11)(g)1.
1. When a broken seal or gasket on an access door or other opening is identified, it shall be repaired as soon as practicable, but not later than 30 calendar days after it is identified, except as provided in
sub. (8).
NR 440.70(11)(h)
(h) An owner or operator shall notify the department in the report required by
s. NR 440.07 that the owner or operator has elected to construct and operate a floating roof under
pars. (a) to
(g).
NR 440.70(11)(i)
(i) For portions of the oil-water separator tank where it is infeasible to construct and operate a floating roof, such as the skimmer mechanism and weirs, a fixed roof meeting the requirements of
sub. (5) (a) shall be installed.
NR 440.70(11)(j)
(j) Except as provided in
par. (i), if an owner or operator elects to comply with the provisions of this subsection, then the owner or operator does not need to comply with the provisions of
sub. (5) or
40 CFR 60.694 applicable to the same facilities.
NR 440.70 Note
Note:
Under
40 CFR 60.694, if, in the administrator's judgment, an alternative means of emission limitation will achieve a reduction in VOC emissions at least equivalent to the reduction in VOC emissions achieved by the applicable requirement in subs. (3) to (9), the administrator will publish in the Federal Register a notice permitting the use of the alterative means for purposes of compliance with that requirement. The notice may condition the permission on requirements related to the operation and maintenance of the alternative means. Any such notice shall be published only after notice and an opportunity for a hearing. Any person seeking permission under
40 CFR 60.694 shall collect, verify and submit to the administrator information showing that the alterative means achieves equivalent emission reductions.
NR 440.70(13)(a)(a) Each owner or operator subject to the provisions of this section shall install, calibrate, maintain and operate according to manufacturer's specifications the following equipment, unless alternative monitoring procedures or requirements are approved for that facility by the department.
NR 440.70(13)(a)1.
1. Where a thermal incinerator is used for VOC emission reduction, a temperature monitoring device equipped with a continuous recorder shall be used to measure the temperature of the gas stream in the combustion zone of the incinerator. The temperature monitoring device shall have an accuracy of
±1% of the temperature being measured, expressed in
°C, or
± 0.5
°C (0.9
°F), whichever is greater.
NR 440.70(13)(a)2.
2. Where a catalytic incinerator is used for VOC emission reduction, temperature monitoring devices, each equipped with a continuous recorder, shall be used to measure the temperature in the gas stream immediately before and after the catalyst bed of the incinerator. The temperature monitoring devices shall have an accuracy of
±1% of the temperature being measured, expressed in
°C, or
± 0.5
°C (0.9
°F), whichever is greater.
NR 440.70(13)(a)3.
3. Where a carbon absorber is used for VOC emissions reduction, monitoring is required as follows:
NR 440.70(13)(a)3.a.
a. For a carbon adsorption system that regenerates the carbon bed directly onsite, a monitoring device that continuously indicates and records the VOC concentration level or reading of organics in the exhaust gases of the control device outlet gas stream or inlet and outlet gas stream shall be used.
NR 440.70(13)(a)3.b.
b. For a carbon adsorption system that does not regenerate the carbon bed directly onsite in the control device, e.g., a carbon canister, the concentration level of the organic compounds in the exhaust vent stream from the carbon adsorption system shall be monitored on a regular schedule, and the existing carbon shall be replaced with fresh carbon immediately when carbon breakthrough is indicated. The device shall be monitored on a daily basis or at intervals no greater than 20% of the design carbon replacement interval, whichever is greater. As an alternative to conducting this monitoring, an owner or operator may replace the carbon in the carbon adsorption system with fresh carbon at a regular predetermined time interval that is less than the carbon replacement interval that is determined by the maximum design flow rate and organic concentration in the gas stream vented to the carbon adsorption system.
NR 440.70(13)(b)
(b) Where a VOC recovery device other than a carbon absorber is used to meet the requirements specified in
sub. (7) (a), the owner or operator shall provide to the department information describing the operation of the control device and the process parameters that would indicate proper operation and maintenance of the device. The department may request further information and will specify appropriate monitoring procedures or requirements.
NR 440.70(13)(c)
(c) An alternative operational or process parameter may be monitored if it can be demonstrated that another parameter will ensure that the control device is operated in conformance with these standards and the control device's design specifications.
NR 440.70(14)
(14) Performance test methods and procedures and compliance provisions. NR 440.70(14)(a)(a) Before using any equipment installed in compliance with the requirements of
sub. (4),
(5),
(6),
(7),
(10) or
(11), the owner or operator shall inspect the equipment for indications of potential emissions, defects or other problems that may cause the requirements of this section not to be met. Points of inspection shall include, but are not limited to, seals, flanges, joints, gaskets, hatches, caps and plugs.
NR 440.70(14)(b)
(b) The owner or operator of each source that is equipped with a closed vent system and control device as required in
sub. (7), other than a flare, is exempt from
s. NR 440.08 and shall use Method 21 of
40 CFR part 60 Appendix A, incorporated by reference in
s. NR 440.17, to measure the emission concentrations, using 500 ppm as the no detectable emission limit. The instrument shall be calibrated each day before using. The calibration gases shall be:
NR 440.70(14)(b)2.
2. A mixture of either methane or n-hexane and air at a concentration of approximately, but less than, 10,000 ppm methane or n-hexane.
NR 440.70(14)(c)
(c) The owner or operator shall conduct a performance test initially and at other times as requested by the department, using the test methods and procedures in
s. NR 440.18 (6) to determine compliance of flares.
NR 440.70(14)(d)
(d) After installing the control equipment required to meet
sub. (11) (a) to
(g) or whenever sources that have ceased to treat refinery wastewater for a period of 1 year or more are placed back into service, the owner or operator shall determine compliance with the standards in
sub. (11) (a) to
(g) as follows:
NR 440.70(14)(d)1.
1. The maximum gap widths and maximum gap areas between the primary seal and the separator wall and between the secondary seal and the separator wall shall be determined individually within 60 calendar days of the initial installation of the floating roof and introduction of refinery wastewater or 60 calendar days after the equipment is placed back into service using the following procedure when the separator is filled to the design operating level and when the roof is floating off the roof supports.
NR 440.70(14)(d)1.a.
a. Measure seal gaps around the entire perimeter of the separator in each place where a 0.32 cm (0.125 in) diameter uniform probe passes freely, without forcing or binding against seal, between the seal and the wall of the separator and measure the gap width and perimetrical distance of each such location.
NR 440.70(14)(d)1.b.
b. That total surface area of each gap described in
subd. 1. a. shall be determined by using probes of various widths to measure accurately the actual distance from the wall to the seal and multiplying each such width by its respective perimetrical distance.
NR 440.70(14)(d)1.c.
c. Add the gap surface area of each gap location for the primary seal and the secondary seal individually, divide the sum for each seal by the nominal perimeter of the separator basin and compare each to the maximum gap area as specified in
sub. (11).
NR 440.70(14)(d)2.
2. The gap widths and total gap area shall be determined using the procedure in
subd. 1. according to the following frequency:
NR 440.70(15)(a)(a) Each owner or operator of a facility subject to the provisions of this section shall comply with the recordkeeping requirements of this subsection. All records shall be retained for a period of 2 years after being recorded unless otherwise noted.
NR 440.70(15)(b)
(b) For individual drain systems subject to
sub. (4), the location, date and corrective action shall be recorded for each drain when the water seal is dry or otherwise breached, when a drain cap or plug is missing or improperly installed or other problem is identified that could result in VOC emissions, as determined during the initial and periodic visual or physical inspection.
NR 440.70(15)(c)
(c) For junction boxes subject to
sub. (4), the location, date and corrective action shall be recorded for inspections required by
sub. (4) (f) to
(i) when a broken seal, gap or other problem is identified that could result in VOC emissions.
NR 440.70(15)(d)
(d) For sewer lines subject to
subs. (4) and
(5) (e), the location, date and corrective action shall be recorded for inspections required by
sub. (4) (j) to
(n) and
(10) (e) to
(g) when a problem is identified that could result in VOC emissions.
