NR 661.1084(5)(a)3.f.f. Each penetration of the internal floating roof that allows for passage of a column supporting the fixed roof shall have a flexible fabric sleeve seal or a gasketed sliding cover.

NR 661.1084(5)(b)(b) The remanufacturer or other person that stores or treats the hazardous secondary material shall operate the tank in accordance with all of the following requirements:

NR 661.1084(5)(b)1.1. When the floating roof is resting on the leg supports, the process of filling, emptying, or refilling shall be continuous and shall be completed as soon as practical.

NR 661.1084(5)(b)2.2. Automatic bleeder vents shall be set closed at all times when the roof is floating, except when the roof is being floated off or is being landed on the leg supports.

NR 661.1084(5)(b)3.3. Prior to filling the tank, each cover, access hatch, gauge float well or lid on any opening in the internal floating roof shall be bolted or fastened closed, so that there are no visible gaps. Rim space vents shall be set to open only when the internal floating roof is not floating or when the pressure beneath the rim exceeds the manufacturer’s recommended setting.

NR 661.1084(5)(c)(c) The remanufacturer or other person that stores or treats the hazardous secondary material shall inspect the internal floating roof in accordance with all of the following:

NR 661.1084(5)(c)1.1. The floating roof and its closure devices shall be visually inspected by the remanufacture or other person that stores or treats the hazardous secondary material to check for defects that could result in air pollutant emissions. Defects include conditions in which the internal floating roof is not floating on the surface of the liquid inside the tank; liquid has accumulated on top of the internal floating roof; any portion of the roof seals have detached from the roof rim; holes, tears, or other openings are visible in the seal fabric; the gaskets no longer close off the hazardous secondary material surface from the atmosphere; or the slotted membrane has more than 10 percent open area.

NR 661.1084(5)(c)2.2. Except as provided in subd. 3., the remanufacturer or other person that stores or treats the hazardous secondary material shall inspect the internal floating roof components using all of the following procedures:

NR 661.1084(5)(c)2.a.a. Visually inspect the internal floating roof components through openings on the fixed-roof, such as manholes and roof hatches, at least once every 12 months after initial fill.

NR 661.1084(5)(c)2.b.b. Visually inspect the internal floating roof, primary seal, secondary seal, if one is in service, gaskets, slotted membranes, and sleeve seals, if any, each time the tank is emptied and degassed and at least every 10 years.

NR 661.1084(5)(c)3.3. As an alternative to performing the inspections specified in subd. 2. for an internal floating roof equipped with 2 continuous seals mounted one above the other, the remanufacturer or other person that stores or treats the hazardous secondary material may visually inspect the internal floating roof, primary and secondary seals, gaskets, slotted membranes, and sleeve seals, if any, each time the tank is emptied and degassed and at least every 5 years.

NR 661.1084(5)(c)4.4. Prior to each inspection required under subd. 2. or 3., the remanufacturer or other person that stores or treats the hazardous secondary material shall notify the department in advance to provide the department with the opportunity to have an observer present during the inspection. The remanufacturer or other person that stores or treats the hazardous secondary material shall notify the department of the date and location of the inspection as follows:

NR 661.1084(5)(c)4.a.a. Prior to each visual inspection of an internal floating roof in a tank that has been emptied and degassed, the remanufacturer or other person that stores or treats the hazardous secondary material shall prepare and send written notification so that it is received by the department at least 30 calendar days before refilling the tank except when an inspection is not planned as provided for in subd. 4. b.

NR 661.1084(5)(c)4.b.b. When a visual inspection is not planned and the remanufacturer or other person that stores or treats the hazardous secondary material could not have known about the inspection 30 calendar days before refilling the tank, the remanufacturer or other person that stores or treats the hazardous secondary material shall notify the department as soon as possible, but no later than 7 calendar days before refilling the tank. This notification may be made by telephone and immediately followed by a written explanation for why the inspection is unplanned. Alternatively, written notification, including the explanation for the unplanned inspection, may be sent so that it is received by the department at least 7 calendar days before refilling the tank.

NR 661.1084(5)(c)5.5. In the event that a defect is detected, the remanufacturer or other person that stores or treats the hazardous secondary material shall repair the defect in accordance with the requirements under sub. (11).

NR 661.1084(5)(c)6.6. The remanufacturer or other person that stores or treats the hazardous secondary material shall maintain a record of the inspection in accordance with the requirements specified in s. NR 661.1089 (2).

NR 661.1084(5)(d)(d) Safety devices, as defined in s. NR 661.1081, may be installed and operated as necessary on any tank complying with the requirements specified in this subsection.

NR 661.1084(6)(6) The remanufacturer or other person that stores or treats the hazardous secondary material who controls air pollutant emissions from a tank using an external floating roof shall meet the requirements specified in pars. (a) to (c).

NR 661.1084(6)(a)(a) The remanufacturer or other person that stores or treats the hazardous secondary material shall design the external floating roof in accordance with all of the following requirements:

NR 661.1084(6)(a)1.1. The external floating roof shall be designed to float on the liquid surface except when the floating roof is supported by the leg supports.

NR 661.1084(6)(a)2.2. The floating roof shall be equipped with 2 continuous seals, one above the other, between the wall of the tank and the roof edge. The lower seal is referred to as the primary seal, and the upper seal is referred to as the secondary seal. The primary seal and secondary seal shall meet the following requirements:

NR 661.1084(6)(a)2.a.a. The primary seal shall be a liquid-mounted seal or a metallic shoe seal, as defined in s. NR 661.1081. The total area of the gaps between the tank wall and the primary seal may not exceed 212 square centimeters per meter of tank diameter, and the width of any portion of these gaps may not exceed 3.8 centimeters. If a metallic shoe seal is used for the primary seal, the metallic shoe seal shall be designed so that one end extends into the liquid in the tank and the other end extends a vertical distance of at least 61 centimeters above the liquid surface.

NR 661.1084(6)(a)2.b.b. The secondary seal shall be mounted above the primary seal and cover the annular space between the floating roof and the wall of the tank. The total area of the gaps between the tank wall and the secondary seal may not exceed 21.2 square centimeters per meter of tank diameter, and the width of any portion of these gaps may not exceed 1.3 centimeters.

NR 661.1084(6)(a)3.a.a. Except for automatic bleeder vents, vacuum breaker vents, and rim space vents, each opening in a noncontact external floating roof shall provide a projection below the liquid surface.

NR 661.1084(6)(a)3.b.b. Except for automatic bleeder vents, rim space vents, roof drains, and leg sleeves, each opening in the roof shall be equipped with a gasketed cover, seal, or lid.

NR 661.1084(6)(a)3.c.c. Each access hatch and each gauge float well shall be equipped with a cover designed to be bolted or fastened when the cover is secured in the closed position.