NR 440.285(4)(b)1.1. Determine the gap areas and maximum gap widths, between the primary seal and the wall of the storage vessel and between the secondary seal and the wall of the storage vessel according to the following frequency.
NR 440.285(4)(b)1.a.a. Measurements of gaps between the storage vessel wall and the primary seal (seal gaps) shall be performed during the hydrostatic testing of the vessel or within 60 days of the initial fill with VOL and at least once every 5 years thereafter.
NR 440.285(4)(b)1.b.b. Measurements of gaps between the storage vessel wall and the secondary seal shall be performed within 60 days of the initial fill with VOL and at least once per year thereafter.
NR 440.285(4)(b)1.c.c. If any source ceases to store VOL for a period of one year or more, subsequent introduction of VOL into the vessel shall be considered an initial fill for the purposes of subd. 1. a. and b.
NR 440.285(4)(b)2.2. Determine gap widths and areas in the primary and secondary seals individually by the following procedures:
NR 440.285(4)(b)2.a.a. Measure seal gaps, if any, at one or more floating roof levels when the roof is floating off the roof leg supports.
NR 440.285(4)(b)2.b.b. Measure seal gaps around the entire circumference of the storage vessel in each place where a 0.32-cm diameter uniform probe passes freely (without forcing or binding against the seal) between the seal and the wall of the storage vessel and measure the circumferential distance of each such location.
NR 440.285(4)(b)2.c.c. The total surface area of each gap described in subd. 2. b. shall be determined by using probes of various widths to measure accurately the actual distance from the storage vessel wall to the seal and multiplying each such width by its respective circumferential distance.
NR 440.285(4)(b)3.3. Add the gap surface area of each gap location for the primary seal and the secondary seal individually and divide the sum for each seal by the nominal diameter of the storage vessel and compare each ratio to the respective standards in subd. 4.
NR 440.285(4)(b)4.4. Make necessary repairs or empty the storage vessel within 45 days of identification in any inspection for seals not meeting the requirements listed in subd. 4. a.
NR 440.285(4)(b)4.a.a. The accumulated area of gaps between the storage vessel wall and the mechanical shoe or liquid-mounted primary seal may not exceed 212 cm2 per meter of storage vessel diameter, and the width of any portion of any gap may not exceed 3.81 cm.
1) One end of the mechanical shoe is to extend into the stored liquid, and the other end is to extend a minimum vertical distance of 61 cm above the stored liquid surface.
2) There may be no holes, tears, or other openings in the shoe, seal fabric, or seal envelope.
NR 440.285(4)(b)4.b.b. The secondary seal is to meet the following requirements:
1) The secondary seal is to be installed above the primary seal so that it completely covers the space between the roof edge and the storage vessel wall except as provided in subd. 2. c.
2) The accumulated area of gaps between the storage vessel wall and the secondary seal may not exceed 21.2 cm2 per meter of storage vessel diameter, and the width of any portion of any gap may not exceed 1.27 cm.
3) There may be no holes, tears, or other openings in the seal or seal fabric.
NR 440.285(4)(b)4.c.c. If a failure that is detected during inspections required in subd. 1 cannot be repaired within 45 days, a 30-day extension may be requested from the department in the inspection report required in sub. (6) (b) 4. An extension request shall include a demonstration of unavailability of alternate storage capacity and a specification of a schedule that will assure that the control equipment will be repaired or the vessel will be emptied as soon as possible.
NR 440.285(4)(b)5.5. Notify the department 30 days in advance of any gap measurements required by subd. 1. to afford the department opportunity to have an observer present.
NR 440.285(4)(b)6.6. Visually inspect the external floating roof, the primary seal, secondary seal, and fittings each time the vessel is emptied and degassed.
NR 440.285(4)(b)6.a.a. If the external floating roof has defects, or the primary seal has holes, tears, or other openings in the seal or the seal fabric, the owner or operator shall repair the items as necessary so that none of the conditions specified in this paragraph exist before filling or refilling the storage vessel with VOL.
NR 440.285(4)(b)6.b.b. For all the inspections required by this subdivision, the owner or operator shall notify the department in writing at least 30 days prior to the filling or refilling of each storage vessel to afford the department the opportunity to inspect the storage vessel prior to refilling. If the inspection required by this subdivision is not planned and the owner or operator could not have known about the inspection 30 days in advance of refilling the storage vessel, the owner or operator shall notify the department at least 7 days prior to the refilling of the storage vessel. Notification shall be made by telephone immediately followed by written documentation demonstrating why the inspection was unplanned. Alternatively, this notification including the written documentation may be made in writing and sent by express mail so that it is received by the department at least 7 days prior to the refilling.
NR 440.285(4)(c)(c) The owner or operator of each source that is equipped with a closed vent system and control device as required in sub. (3) (a) 3. or (b) 2. (other than a flare) is exempt from s. NR 440.08 and shall meet the following requirements:
NR 440.285(4)(c)1.1. Submit for approval by the administrator as an attachment to the notification required by s. NR 440.07 (1) (a), or if the facility is exempt from s. NR 440.07 (1) (a), an operating plan containing the following information:
NR 440.285(4)(c)1.a.a. Documentation demonstrating that the control device will achieve the required control efficiency during maximum loading conditions. This documentation shall include a description of the gas stream which enters the control device, including flow and VOC content under varying liquid level conditions (dynamic and static) and manufacturer’s design specifications for the control device. If the control device or the closed vent capture system receives vapors, gases, or liquids other than fuels from sources that are not designated sources under this section, the efficiency demonstration shall include consideration of all vapors, gases, and liquids received by the closed vent capture system and control devices. If an enclosed combustion device with a minimum residence time of 0.75 seconds and a minimum temperature of 816°C is used to meet the 95% requirement, documentation that those conditions will exist is sufficient to meet the requirements of this paragraph.
NR 440.285(4)(c)1.b.b. A description of the parameter or parameters to be monitored to ensure that the control device will be operated in conformance with its design and an explanation of the criteria used for selection of that parameter (or parameters).
NR 440.285(4)(c)2.2. Operate the closed vent system and control device and monitor the parameters of the closed vent system and control device in accordance with the operating plan submitted to the department in accordance with subd. 1., unless the plan was modified by the department during the review process. In this case, the modified plan applies.
NR 440.285(4)(d)(d) The owner or operator of each source that is equipped with a closed vent system and a flare to meet the requirements in sub. (3) (a) 3. or (b) 2. shall meet the requirements as specified in the general control device requirements under s. NR 440.18 (5) and (6).
NR 440.285(5)(5)Alternative means of emission limitations.