18 C.F.R. § 284.264
(a) General conditions.
(6) A recipient of emergency natural gas that directly benefits from the service must:
(b) Duration—(1) Emergency sale or transportation. An emergency natural gas transaction is limited to 60 consecutive calendar days, except that such transaction may be continued for an additional 60 consecutive days if:
(i) Fifteen days prior to the end of the initial 60-day period, the recipient of emergency natural gas files a petition that: