40 CFR §63.7912

1. (a)If you use a floating roof according to § 63.7910(b)(1), you must meet requirements in paragraphs (a)(1) and (2) of this section.
   1. (1)Measure the seal gaps at least annually according to the requirements in § 63.1047(b)(1).
   2. (2)Visually inspect the floating roof at least annually according to the requirements in § 63.1047(b)(2).
2. (b)If you use a cover vented to a control device according to § 63.7910(b)(1) or (2), you must meet requirements in paragraphs (b)(1) and (2) of this section.
   1. (1)You must visually inspect the cover and its closure devices for defects according to the requirements in § 63.1047(c).
   2. (2)You must monitor and inspect the closed vent system and control device according to the requirements in § 63.7927 that apply to you.
3. (c)If you use a pressurized separator that operates as a closed system according to § 63.7910(b)(3), you must visually inspect each pressurized separator and closure devices for defects at least annually to ensure they are operating according to the design requirements in § 63.1045(b), with the exceptions specified in § 63.7910(b)(3).