N.H. Code Admin. R. Env-A 804.21

Current through Register No. 25, June 20, 2024

Section Env-A 804.21 - External Floating Roof VOC Storage Tanks

The 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. Code Admin. R. 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.