An above-ground, vertical, fixed roof tank meeting the applicability criteria of Env-A 1217.01 shall use the following control techniques:

1. (a) The tank shall be retrofitted with an internal floating roof equipped with a closure seal, or seals, to close the space between the roof edge and tank wall;
2. (b) Closure seals shall be maintained such that there are no visible holes, tears, or other openings in the seal(s) or any seal fabric or materials;
3. (c) All openings, except stub drains, shall be equipped with covers, seals, or lids that are kept closed at all times except when in actual use;
4. (d) Automatic bleeder vents shall remain closed at all times except when the roof is floated off or being landed on the roof leg supports;
5. (e) Rim vents, if provided, shall be set to open when the roof is being floated off the roof leg supports or at the manufacturer's recommended setting;

6. (f) For a tank equipped with a single-seal system, visual inspections shall be conducted:

   1. (1) Of the internal floating roof and its closure seal(s) through roof hatches at least once every 12 months; and
   2. (2) Of the internal floating roof, seal(s), gaskets, slotted membranes, and sleeve seals at least once every 10 years or each time the tank is emptied and degassed, whichever occurs first; and

7. (g) For a tank equipped with a double-seal system, visual inspections shall be conducted either:

   1. (1) As specified in (f) above; or
   2. (2) Of the internal floating roof, seal(s), gaskets, slotted membranes, and sleeve seals at least once every 5 years or each time the tank is emptied and degassed; whichever occurs first.

Source. (See Revision Note at chapter heading for Env-A 1200) #9933, eff 6-1-11; ss by #12899, eff 10-17-19