45. Every above-ground tank of a capacity equal to or greater than 75 m3 with a diameter of 4 m or more that is used to store volatile organic compounds that have a vapor pressure under storage conditions between 10 and 76 kPa must have a floating roof of one of the following types:
(1) double seal;
(2) liquid-mounted primary seal;
(3) mechanical shoe seal; or
(4) another type that has a sealing efficiency of at least 95%.
If the vapor pressure of the stored products is greater than 76 kPa under storage conditions, the tank must have an emission recovery system.
This section applies to existing above-ground tanks as of the date of the first repair that requires degassing or not later than 31 December 2013, whichever is earlier.
O.C. 501-2011, s. 45; O.C. 657-2013, s. 2.