Section Env-A 804.21 - External Floating Roof VOC Storage TanksThe owner or operator of a VOC storage tank with an external floating roof shall perform the following actions:
(a) A visual inspection of the secondary seal gap during semi-annual inspections; and(b) When the roof is equipped with a vapor-mounted primary seal, annual measurement of the secondary seal gap in accordance with the following procedure: (1) The length and width of all gaps around the entire circumference of the secondary seal shall be measured in each place where a 0.32 cm or 0.125 in. uniform diameter probe passes freely, without forcing or binding against the seal, between the seal and tank wall; and(2) The sum of the areas of the individual gaps shall be calculated.N.H. Admin. Code § Env-A 804.21
#7788, eff 10-31-02; ss by #9802, eff 10-31-10 (from Env-A 804.19)
Amended by Volume XXXIX Number 19, Filed May 9, 2019, Proposed by #12762, Effective 5/1/2019, Expires 5/1/2029.