Section NR 464.08 - Standards for enclosures and closed-vent systems(1) Each enclosure and closed-vent system specified in ss. NR 464.03(3), 464.04(2) and 464.05(2) for capturing and transporting vent streams that contain HAP shall meet the requirements specified in subs. (2) to (4).(2) Each enclosure shall maintain negative pressure at each enclosure or hood opening as demonstrated by the procedures specified in 40 CFR 63.457(e), incorporated by reference in s. NR 484.03(6). Each enclosure or hood opening closed during the initial performance test specified in 40 CFR 63.457(a) shall be maintained in the same closed and sealed position as during the performance test at all times except when necessary to use the opening for sampling, inspection, maintenance or repairs.(3) Each component of the closed-vent system used to comply with ss. NR 464.03(3), 464.04(2) and 464.05(2) that is operated at positive pressure and located prior to a control device shall be designed for and operated with no detectable leaks as indicated by an instrument reading of less than 500 parts per million by volume above background, as measured by the procedures specified in 40 CFR 63.457(d), incorporated by reference in s. NR 484.03(6).(4) Each bypass line in the closed-vent system that could divert vent streams containing HAP to the atmosphere without meeting the emission limitations in ss. NR 464.03 to shall comply 464.05 with either of the following requirements: (a) On each bypass line, the owner or operator shall install, calibrate, maintain and operate according to manufacturer's specifications a flow indicator that provides a record of the presence of gas stream flow in the bypass line at least once every 15 minutes. The flow indicator shall be installed in the bypass line in such a way as to indicate flow in the bypass line.(b) For bypass line valves that are not computer controlled, the owner or operator shall maintain the bypass line valve in the closed position with a car seal or a seal placed on the valve or closure mechanism in such a way that valve or closure mechanism cannot be opened without breaking the seal.Wis. Admin. Code Department of Natural Resources NR 464.08
CR 00-175: cr. Register March 2002 No. 555, eff. 4-1-02.