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)(c)(c) Flares used to comply with this section shall comply with the requirements of s. NR 440.18.
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)(8)Standards: delay of repair.
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)(9)Standards: delay of compliance.
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.