Section 61.242-7 - Standards: Valves(a) Each valve shall be monitored monthly to detect leaks by the method specified in § 61.245(b) and shall comply with paragraphs (b)-(e), except as provided in paragraphs (f), (g), and (h) of this section, § 61.243-1 or § 61.243-2 , and § 61.242-1(c) .(b) If an instrument reading of 10,000 ppm or greater is measured, a leak is detected.(c)(1) Any valve for which a leak is not detected for 2 successive months may be monitored the first month of every quarter, beginning with the next quarter, until a leak is detected.(2) If a leak is detected, the valve shall be monitored monthly until a leak is not detected for 2 successive months.(d)(1) When a leak is detected, it shall be repaired as soon as practicable, but no later than 15 calendar days after the leak is detected, except as provided in § 61.242-10 .(2) A first attempt at repair shall be made no later than 5 calendar days after each leak is detected.(e) First attempts at repair include, but are not limited to, the following best practices where practicable: (1) Tightening of bonnet bolts;(2) Replacement of bonnet bolts;(3) Tightening of packing gland nuts; and(4) Injection of lubricant into lubricated packing.(f) Any valve that is designated, as described in § 61.246(e)(2) , for no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, is exempt from the requirements of paragraph (a) if the valve:(1) Has no external actuating mechanism in contact with the process fluid;(2) Is operated with emissions less than 500 ppm above background, as measured by the method specified in § 61.245(c) ; and(3) Is tested for compliance with paragraph (f)(2) initially upon designation, annually, and at other times requested by the Administrator.(g) Any valve that is designated, as described in § 61.246(f)(1) , as an unsafe-to-monitor valve is exempt from the requirements of paragraph (a) if: (1) The owner or operator of the valve demonstrates that the valve is unsafe to monitor because monitoring personnel would be exposed to an immediate danger as a consequence of complying with paragraph (a); and(2) The owner or operator of the valve has a written plan that requires monitoring of the valve as frequent as practicable during safe-to-monitor times.(h) Any valve that is designated, as described in § 61.246(f)(2) , as a difficult-to-monitor valve is exempt from the requirements of paragraph (a) if:(1) The owner or operator of the valve demonstrates that the valve cannot be monitored without elevating the monitoring personnel more than 2 meters above a support surface;(2) The process unit within which the valve is located is an existing process unit; and(3) The owner or operator of the valve follows a written plan that requires monitoring of the valve at least once per calendar year.