NR 661.1084(5)(a)1.1. The internal floating roof shall be designed to float on the liquid surface except when the floating roof shall be supported by the leg supports.

NR 661.1084(5)(a)2.2. The internal floating roof shall be equipped with a continuous seal between the wall of the tank and the floating roof edge that meets any of the following requirements:

NR 661.1084(5)(a)2.a.a. A single continuous seal that is either a liquid-mounted seal or a metallic shoe seal, as defined in s. NR 661.1081.

NR 661.1084(5)(a)2.b.b. Two continuous seals mounted one above the other. The lower seal may be a vapor-mounted seal.

NR 661.1084(5)(a)3.a.a. Each opening in a noncontact internal floating roof except for automatic bleeder vents, vacuum breaker vents, and the rim space vents shall provide a projection below the liquid surface.

NR 661.1084(5)(a)3.b.b. Each opening in the internal floating roof shall be equipped with a gasketed cover or a gasketed lid except for leg sleeves, automatic bleeder vents, rim space vents, column wells, ladder wells, sample wells, and stub drains.

NR 661.1084(5)(a)3.c.c. Each penetration of the internal floating roof for the purpose of sampling shall have a slit fabric cover that covers at least 90 percent of the opening.

NR 661.1084(5)(a)3.d.d. Each automatic bleeder vent and rim space vent shall be gasketed.

NR 661.1084(5)(a)3.e.e. Each penetration of the internal floating roof that allows for passage of a ladder shall have a gasketed sliding cover.

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).