Section Env-A 1217.02 - Control Techniques for Fixed-Roof Tank VOL StorageAn above-ground, vertical, fixed roof tank meeting the applicability criteria of Env-A 1217.01 shall use the following control techniques:
(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;(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;(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;(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;(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;(f) For a tank equipped with a single-seal system, visual inspections shall be conducted: (1) Of the internal floating roof and its closure seal(s) through roof hatches at least once every 12 months; and(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(g) For a tank equipped with a double-seal system, visual inspections shall be conducted either: (1) As specified in (f) above; or(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.N.H. Code Admin. R. Env-A 1217.02
(See Revision Note at chapter heading for Env-A 1200) #9933, eff 6-1-11
Amended by Volume XXXIX Number 46, Filed November 14, 2019, Proposed by #12899, Effective 10/17/2019, Expires 10/17/2029