(a) You must visually inspect each of your tanks using Tank Level 1 controls for defects at least annually according to the requirements in Sec. 63.906(a).
(b) You must inspect and monitor each of your tanks using Tank Level 2 controls according to the requirements in paragraphs (b)(1) through (5), as applicable to your tanks.
(1) If you use a fixed roof with an internal floating roof according to Sec. 63.7895(d)(1), you must visually inspect the fixed roof and internal floating roof according to the requirements in Sec. 63.1063(d)(1) and (2).
(2) If you use an external floating roof according to Sec. 63.7895(d)(2), you must visually inspect the external floating roof according to the requirements in Sec. 63.1063(d)(1) and inspect the seals according to the requirements in Sec. 63.1063(d)(2) and (3).
(3) If you use a fixed roof vented to a control device according to Sec. 63.7895(d)(3), you must meet requirements in paragraphs (b)(3)(i) and (ii) of this section.
(i) You must visually inspect the fixed roof and closure devices for defects according to the requirements in Sec. 63.695(b)(3).
(ii) You must monitor and inspect the closed vent system and control device according to the requirements in Sec. 63.7927 that apply to you.
(4) If you use a pressure tank according to Sec. 63.7895(d)(4), you must visually inspect the tank and its closure devices for defects at least annually to ensure they are operating according to the design requirements in Sec. 63.685(h).
(5) If you use a permanent total enclosure vented to an enclosed combustion device according to Sec. 63.7895(d)(5), you must meet requirements in paragraphs (b)(5)(i) and (ii) of this section.
(i) You must perform the verification procedure for the permanent total enclosure at least annually according to the requirements in Sec. 63.685(i).
(ii) You must monitor and inspect the closed vent system and control device according to the requirements in Sec. 63.7927 that apply to you.