NR 420.02(17)
(17) “Forebays" means the primary sections of a wastewater separator.
NR 420.02(18)
(18) “Fuel gas" means any gas which is generated by a petroleum refinery process unit or by a petroleum liquid transfer operation and which is combusted, or any gaseous mixture of such gas and natural gas which is combusted.
NR 420.02(20)
(20) “Gasoline dispensing facility" means any site where gasoline is dispensed to motor vehicle gasoline tanks from stationary storage tanks.
NR 420.02(21)
(21) “Gaseous service" means petroleum refinery equipment which processes, transfers or contains a VOC or mixture of VOCs in the gaseous phase.
NR 420.02(22)
(22) “Leaking component" means any component at a petroleum refinery which has a VOC concentration exceeding 10,000 ppm when tested in the manner approved by the department.
NR 420.02(23)
(23) “Liquid-mounted seal" means a primary floating roof seal mounted in continuous contact with the liquid in a liquid organic compound storage tank between the tank wall and the floating roof around the internal circumference of the tank.
NR 420.02(24)
(24) “Liquid service" means petroleum refinery equipment which processes, transfers or contains a VOC or mixture of VOCs in the liquid phase.
NR 420.02(24m)
(24m) “Liquid tight" means having a liquid leak rate not exceeding 0.10 gallons per hour when measured with a
±
5% accuracy.
NR 420.02(25)
(25) “Lower explosive limit" or “LEL" means the lower limit of flammability of a gas or vapor at ordinary ambient temperatures expressed as percent propane in air by volume.
NR 420.02(27)
(27) “Petroleum" means the crude oil removed from the earth and the oils derived from tar sands, shale, coal and coke.
NR 420.02(29)
(29) “Petroleum refinery" means any facility engaged in producing gasoline, kerosene, distillate fuel oils, residual fuel oils, lubricants or other products through distillation of petroleum or through redistillation, cracking, extraction or reforming of unfinished petroleum derivatives.
NR 420.02(29m)
(29m) “Process gas" means any gas generated by a petroleum refinery process unit except fuel gas and process upset gas as defined in this section.
NR 420.02(29p)
(29p) “Process upset gas" means any gas generated by a petroleum refinery process unit as a result of startup, shutdown, upset or malfunction.
NR 420.02(30)
(30) “Refinery process unit" means any segment of a petroleum refinery in which a specific processing operation is conducted.
NR 420.02(31)
(31) “Reid vapor pressure" means the absolute vapor pressure of volatile crude petroleum and volatile nonviscous petroleum liquids except liquefied petroleum gases as determined by ASTM D323-08, incorporated by reference in
s. NR 484.10 (6).
NR 420.02(32m)
(32m) “Top off" means to attempt to dispense more gasoline to a motor vehicle fuel tank after the vapor recovery dispensing nozzle has shut off.
NR 420.02(33)
(33) “True vapor pressure" means the equilibrium partial pressure exerted by a petroleum liquid as determined in accordance with methods described in American Petroleum Institute Publication 2517,
Evaporative Loss from External Floating Roof Tanks, 3rd edition, February 1989, incorporated by reference in
s. NR 484.11.
NR 420.02(34)
(34) “Turnaround" means the procedure of shutting a refinery unit down after a run to do necessary maintenance and repair work and putting the unit back on stream.
NR 420.02(35)
(35) “Vacuum producing system" means any reciprocating, rotary, or centrifugal blower or compressor, or any jet ejector or device that takes suction from a pressure below atmospheric and discharges against atmospheric pressure.
NR 420.02(36)
(36) “Vapor balance system" means a combination of pipes or hoses which create a closed system between the vapor spaces of an unloading tank and a receiving tank such that vapors displaced from the receiving tank are transferred to the tank being unloaded.
NR 420.02(37)
(37) “Vapor collection system" means, for the purpose of liquid organic compound transfer operations, a vapor transport system which uses direct displacement by the liquid loaded to force vapors from the tank into a vapor control system or vapor holding tank.
NR 420.02(38)
(38) “Vapor-mounted seal" means any primary floating roof seal mounted so that there is an annular vapor space underneath the seal. The annular vapor space is bounded by the bottom of the primary seal, the tank wall, the liquid surface, and the floating roof.
NR 420.02(39)
(39) “Vapor recovery system" or “vapor control system" mean a system that gathers organic compound vapors released during the operation of any transfer, storage, or process equipment and processes the vapors so as to prevent their emission into the ambient air.
NR 420.02(39m)
(39m) “Vapor tight" means having the detection of less than 10,000 ppm hydrocarbon concentration, as determined by Method 21 in Appendix A of
40 CFR part 60, incorporated by reference in
s. NR 484.04 (17), at a distance of one inch from the source.
NR 420.02(40)
(40) “Wastewater (oil-water) separator" means any device or piece of equipment which utilizes the difference in density between oil and water to remove oil and associated chemicals from water. This includes any device, such as a flocculation tank, clarifier, etc., which removes petroleum derived compounds from wastewater.
NR 420.02(41)
(41) “Waxy, heavy pour crude petroleum" means a crude petroleum with a pour point of 10
°C (50
°F) or higher as determined by ASTM D97-02, incorporated by reference in
s. NR 484.10 (2).
NR 420.02 History
History: Renum. from NR 154.01,
Register, September, 1986, No. 369, eff. 10-1-86; renum. (2), (3), (4), (7) and (12) to be NR 419.02 (1), 400.02 (11m), (16e), (21m) and (26m), r. (19), am. (21), (29m) and (29p) renum. from NR 420.02 (71) and (72),
Register, February, 1990, No. 410, eff. 3-1-90; am. (31), (33) and (41),
Register, May, 1992, No. 437, eff. 6-1-92; cr. (8m), (24m), (32m), (38m) and (39m),
Register, January, 1993, No. 445, eff. 2-1-93; am. (31), (33), (39m), (41),
Register, February, 1995, No. 470, eff. 3-1-95;
am. (intro.), renum. (28) to be NR 419.02 (13),
Register, December, 1995, No. 480, eff. 1-1-96; am. (41),
Register, December, 1996, No. 492, eff. 1-1-97; am. (intro.), (31) and (41),
Register, October, 1999, No. 526, eff. 11-1-99;
CR 02-146: am (31) and (41)
Register October 2003 No. 574, eff. 11-1-03 correction in (33) and (39m) made under s. 13.93 (2m) (b) 7., Stats.,
Register October 2003, No. 574;
CR 11-005: am. (31)
Register January 2012 No. 673, eff. 2-1-12;
CR 15-077: r. (8m), (26), (32), (38m), am. (39) Register July 2016 No. 727, eff. 8-1-16. NR 420.03
NR 420.03 Storage of petroleum liquids. NR 420.03(1)
(1)
Applicability. The storage, recordkeeping and maintenance requirements of
subs. (2),
(3) and
(4) apply to all storage vessels for petroleum liquids of more than 151,412 liter (40,000 gallon) capacity on which construction or modification is commenced after July 1, 1975, with the exception of:
NR 420.03(1)(a)
(a) Storage vessels being used for number 2 through number 6 fuel oils as specified in ASTM D396-02, gas turbine fuel oils numbers 2-GT through 4-GT as specified in ASTM D2880-00, or diesel fuel oils numbers 2-D and 4-D as specified in ASTM D975-02. These ASTM standards are incorporated by reference in
s. NR 484.10 (8),
(13) and
(40).
NR 420.03(1)(b)
(b) Storage vessels for the crude petroleum or condensate stored, processed or treated at a drilling and production facility outside a metropolitan county prior to custody transfer.
NR 420.03(1)(c)
(c) Pressure vessels which are designed to operate at pressures in excess of 104 kPa (15 psig) without emissions except under emergency conditions.
NR 420.03(1)(e)
(e) Horizontal underground storage tanks used to store JP-4 jet fuel.
NR 420.03(2)
(2) Storage requirements. The owner or operator of any storage vessel to which this section applies shall store petroleum liquids as follows:
NR 420.03(2)(a)
(a) If the true vapor pressure of the petroleum liquid, as stored, is equal to or greater than 10.5 kPa (1.52 psia) but not greater than 77 kPa (11.1 psia), the storage vessel shall be equipped with a floating roof, a vapor recovery system or an equally effective alternative control method approved by the department.
NR 420.03(2)(b)
(b) If the true vapor pressure of the petroleum liquid, as stored, is greater than 77 kPa (11.1 psia), the storage vessel shall be equipped with a vapor recovery system or an equally effective alternative control method approved by the department.
NR 420.03(3)(a)(a) General records. The owner or operator of any storage vessel to which this section applies shall, for each such storage vessel, maintain a file of each type of petroleum liquid stored, the typical Reid vapor pressure of each type of petroleum liquid stored and the dates of storage. Dates on which the storage vessel is empty shall be indicated.
NR 420.03(3)(b)
(b) Vapor pressure dependent records. The owner or operator of any storage vessel to which this section applies shall, for each such storage vessel, determine and record the average monthly storage temperature and true vapor pressure of the petroleum liquid stored at that temperature if one of the following applies:
NR 420.03(3)(b)1.
1. The petroleum liquid has a true vapor pressure, as stored, greater than 3.5 kPa (0.51 psia) but less than 10.5 kPa (1.52 psia) and is stored in a vessel other than one equipped with a floating roof, a vapor recovery system or their equivalents.
NR 420.03(3)(b)2.
2. The petroleum liquid has a true vapor pressure, as stored, greater than 63 kPa (9.1 psia) and is stored in a storage vessel other than one equipped with a vapor recovery system or its equivalent.
NR 420.03(3)(c)
(c) Vapor pressure determination. The true vapor pressure shall be determined by application of the procedures in API Publication 2517, 3rd edition, incorporated by reference in
s. NR 484.11 (5), in accord with this paragraph. This procedure is dependent upon determination of the average monthly storage temperature and the Reid vapor pressure, which requires sampling of the petroleum liquids in the storage vessels. Unless the department requires in specific cases that the stored petroleum liquid be sampled, the true vapor pressure may be determined by using the average monthly storage temperature and the typical Reid vapor pressure. For those liquids for which certified specifications limiting the Reid vapor pressure exist, that Reid vapor pressure may be used. For other liquids, supporting analytical data shall be made available on request to the department when typical Reid vapor pressure is used.
NR 420.03(4)(a)(a) Applicability. In addition to the vessels identified in
sub. (1) this subsection applies to all storage vessels for petroleum liquids of more than 7,571 liter (2,000 gallon) capacity.
NR 420.03(4)(b)
(b) Requirements. No person may place, hold or store in a storage vessel any petroleum liquid which has a true vapor pressure as stored greater than 10.5 kPa (1.52 psia) unless all of the following requirements are met:
NR 420.03(4)(b)1.
1. Any tank surface exposed to the rays of the sun is painted and maintained white so as to prevent excessive temperature and vapor pressure increases.
NR 420.03(4)(b)2.
2. The seals of any floating roof are maintained so as to minimize emissions.
NR 420.03(4)(b)3.
3. All gauging and sampling devices are vapor tight except when gauging or sampling is taking place.
NR 420.03(5)(a)(a) Applicability. This subsection applies, subject to the provisions of
s. NR 425.03, to all fixed roof storage vessels with capacities greater than 151,412 liters (40,000 gallons) with the exception of those having capacities less than 1,600,000 liters (416,000 gallons) used to store crude petroleum and condensate prior to custody transfer.
NR 420.03(5)(b)
(b) Storage requirements. No owner or operator of a fixed roof storage vessel to which this subsection applies may permit the storage vessel to be used for storing any petroleum liquid which has a true vapor pressure as stored greater than 10.5 kPa (1.52 psia), unless all of the following requirements are met:
NR 420.03(5)(b)1.
1. The vessel has been retrofitted with an internal floating roof equipped with a closure seal, or seals, to close the space between the roof edge and tank wall, or with equally effective alternative controls approved by the department.
NR 420.03(5)(b)3.
3. The vessel is maintained such that there are no visible holes, tears, or other openings in the seal or any seal fabric or materials.
NR 420.03(5)(b)4.
4. All openings, except stub drains, are equipped with covers, lids, or seals such that:
NR 420.03(5)(b)4.a.
a. The cover, lid or seal is in the closed position at all times except when in actual use.
NR 420.03(5)(b)4.b.
b. Automatic bleeder vents are closed at all times except when the roof is floated off or landed on the roof leg supports.
NR 420.03(5)(b)4.c.
c. Rim vents, if provided, are set to open when the roof is being floated off the roof leg supports or at the manufacturer's recommended setting.
NR 420.03(5)(b)5.
5. Routine inspections are conducted through roof hatches at monthly intervals during the ozone season. These routine inspections shall include, at a minimum, a visual examination to determine that the roof is resting on the liquid surface, no liquid has accumulated on the roof, no seal is detached and that there are no tears or holes in the seal material.
NR 420.03(5)(b)6.
6. The vessel is repaired or removed from service as expeditiously as practicable, but no later than 45 days after any routine inspection in which any of the defects described in
subd. 5. are found, unless an extension is granted by the department. If a defect identified in
subd. 5. cannot be repaired or the vessel removed from service within 45 days, a one time 30 day extension may be requested by the owner or operator. The department may grant such a request if the owner or operator demonstrates that alternative storage capacity is not available or that repair or removal of the tank from service is infeasible for reasons beyond the control of the owner or operator.
NR 420.03(5)(b)7.
7. A complete inspection of cover and seal is conducted periodically as required by
par. (c)
NR 420.03(5)(b)8.
8. Records are maintained and retained for a minimum of 5 years, unless otherwise noted, that shall include both of the following:
NR 420.03(5)(b)8.a.
a. The results of inspections conducted under
subds. 5. and
7., including LEL readings, if applicable. All LEL readings and inspection report records shall be maintained for a minimum of 10 years if the facility elects to comply with
par. (c) through use of
par. (c) 2.
NR 420.03(5)(c)
(c)
Complete inspection requirements. All fixed roof storage vessels at a facility to which this subsection applies are required to periodically undergo a complete inspection of cover and seal, and all shall use either
subd. 1. or
2. to demonstrate compliance. No facility may use different compliance methods for different fixed roof storage vessels to comply with this paragraph. The complete inspection shall be conducted according to one of the following schedules:
NR 420.03(5)(c)1.
1. Whenever a fixed roof storage vessel is emptied and degassed or at least every 5 years, whichever is more frequent.
NR 420.03(5)(c)2.
2. Whenever a fixed roof storage vessel is emptied and degassed or at least every 10 years, whichever is more frequent, if all of the following requirements are met:
NR 420.03(5)(c)2.a.
a. The routine monthly inspections during the ozone season, in addition to meeting the requirements of
par. (b) 5., include the measurement with an explosimeter of the organic vapor space above the internal floating roof to demonstrate that the organic vapor concentration does not exceed 50% of the lower explosive limit (LEL) for the stored petroleum liquid.
NR 420.03(5)(c)2.b.
b. The fixed roof storage vessel is repaired or removed from service as expeditiously as practicable, but no later than 45 days after the completion of the routine inspection, if any of the defects described in
par. (b) 5. are found or if the measurement required under
subd. 2. a. exceeds 50% of the LEL.
NR 420.03(5)(c)2.c.
c. Repair steps meeting the requirements of
subd. 2. b. may include tests, maintenance or inspections followed by LEL measurements below 50% within 45 days of the initial LEL reading exceeding 50% that confirm further repair or removal of the tank from service is not warranted.
NR 420.03(5)(d)
(d)
Notification and change of compliance method requirements. All existing facilities which have one or more storage vessels subject to
par. (c) shall notify the department in writing, by January 3, 2000, as to whether the facility will comply with this section under the provisions of
par. (c) 1. or
2. After January 3, 2000, a facility owner or operator may only change the compliance option from
par. (c) 1. to
par. (c) 2. after completing a complete inspection of every affected fixed roof storage vessel at the facility. For any newly constructed facility, the owner or operator shall notify the department prior to commencing operation as to which compliance option will be used. A facility owner or operator may at any time elect to change the compliance option from
par. (c) 2. to
par. (c) 1. provided the following conditions are met:
NR 420.03(5)(d)1.
1. The facility owner or operator notified the department, in writing, at least 30 days prior to the date on which the facility owner or operator plans to begin meeting the requirements of
par. (c) 1.
NR 420.03(5)(d)2.
2. All tanks at the facility were found to be in compliance with the 50% LEL requirement of
par. (c) 2. during their last LEL measurement.
NR 420.03(6)(a)(a) Applicability. This subsection applies, subject to the provisions of
s. NR 425.03 (4) or
(5), to all storage vessels equipped with external floating roofs having capacities greater than 151,412 liters (40,000 gallons) with the exception of:
NR 420.03(6)(a)1.
1. Storage vessels having capacities less than 1,500,000 liters (396,270 gallons) used to store crude petroleum and condensate prior to custody transfer.
NR 420.03(6)(a)3.
3. Storage vessels used solely for petroleum liquids with a true vapor pressure of less than 10.5 kPa (1.52 psia).
NR 420.03(6)(a)4.
4. Storage vessels used solely for petroleum liquids with a true vapor pressure of less than 27.6 kPa (4.0 psia), and which are of welded construction, and presently possess a metallic-type shoe seal, a liquid-mounted foam seal, a liquid-mounted liquid filled type seal, or equally effective alternative control, approved by the department.
NR 420.03(6)(a)5.
5. Storage vessels of welded construction, equipped with metallic-type shoe primary seal which has a secondary seal from the top of the shoe seal to the tank wall.
NR 420.03(6)(b)
(b) Storage requirements. No owner or operator of a storage vessel equipped with an external floating roof to which this subsection applies may permit such storage vessel to be used for storing any petroleum liquid unless all of the following requirements are met:
NR 420.03(6)(b)1.
1. The vessel has been fitted with a continuous secondary seal extending from the floating roof to the tank wall, or the vessel has been fitted with an equally effective alternative control, approved by the department.
NR 420.03(6)(b)2.
2. The vessel is maintained such that all seal closure devices meet the following requirements:
NR 420.03(6)(b)2.a.
a. There are no visible holes, tears, or other openings in the seal or any seal fabric or material.
NR 420.03(6)(b)2.b.
b. The seal or seals are intact and uniformly in place around the circumference of the floating roof between the floating roof and the tank wall.
NR 420.03(6)(b)2.c.
c. For vapor-mounted seals, the accumulated area of gaps exceeding 0.32 cm (1/8 in) in width between the secondary seal and tank wall may not exceed 21.2 cm
2 per meter (1.00 in
2 per foot) of tank diameter.
NR 420.03(6)(b)3.
3. All openings in the external floating roof, except for automatic bleeder vents, rim space vents, and leg sleeves, are:
NR 420.03(6)(b)3.a.
a. Equipped with covers, seals, or lids kept in the closed position except when in actual use.
NR 420.03(6)(b)3.b.
b. Equipped with projections into the tank which remain below the liquid surface at all times.
