154.820—Fire, explosion, and detonation protection.
(a)
A vapor control system with a single facility vapor connection that receives vapor only from a vessel with inerted cargo tanks and processes vapor with a vapor recovery unit must:
(1)
Be capable of inerting the vapor collection line in accordance with § 154.824(a) of this subpart prior to receiving vapors from the vessel;
(2)
Have at least one oxygen analyzer that samples the vapor concentration continuously at a point not more than 6 meters (19.7 ft.) from the facility vapor connection; and
(b)
A vapor control system with a single facility vapor connection that receives vapor only from a vessel with inerted cargo tanks and processes vapor with a vapor destruction unit must:
(1)
Have a detonation arrester located not more than 6 meters (19.7 ft.) from the facility vapor connection; or
(c)
A vapor control system with a single facility vapor connection that receives vapor from a vessel with cargo tanks that are not inerted and processes vapor with a vapor recovery unit must:
(1)
Have a detonation arrester located not more than 6 meters (19.7 ft.) from the facility vapor connection; or
(2)
Have an inerting, enriching, or diluting system that meets the requirements of § 154.824 of this subpart.
(d)
A vapor control system with a single facility vapor connection that receives vapor from a vessel with cargo tanks that are not inerted and processes the vapor with a vapor destruction unit must:
(1)
Have a detonation arrester located not more than 6 meters (19.7 ft.) from the facility vapor connection; and
(2)
Have an inerting, enriching, or diluting system that meets the requirements of § 154.824 of this subpart.
(e)
A vapor control system with multiple facility vapor connections that processes vapor with a vapor recovery unit must have a detonation arrester located not more than 6 meters (19.7 ft.) from each facility vapor connection.
(f)
A vapor control system with multiple facility vapor connections that processes vapor with a vapor destruction unit must:
(1)
Have a detonation arrester located not more than 6 meters (19.7 ft.) from each facility vapor connection; and
(2)
Have an inerting, enriching, or diluting system that meets the requirements of § 154.824 of this subpart.
(g)
A vapor control system that uses a vapor balancing system in which cargo vapor from a vessel is transferred through the facility vapor collection system to facility storage tanks must:
(1)
Have a detonation arrester located not more than 6 meters (19.7 ft.) from each facility vapor connection;
(2)
Have a detonation arrester located within the storage tank containment area as close as practical to the vapor return connection of each facility storage tank; and
(3)
Have facility storage tank high level alarm systems and facility storage tank overfill control systems arranged to prevent cargo from entering the vapor return line.
(h)
Except for a discharge vent from a vapor destruction unit, each outlet of a vapor control system that vents to atmosphere and is not isolated with a pressure-vacuum relief valve must have a flame arrester located at the outlet.