§154.2109. Vapor recovery and vapor destruction units.
33 C.F.R. § 154.2109
Paragraphs (a), (b), and (e) of this section apply only to facilities collecting vapors of flammable, combustible, or non-high flash point liquid cargoes.
The inlet to a vapor recovery unit that receives vapor that has not been inerted, enriched, or diluted in accordance with 33 CFR 154.2107 must be fitted with a detonation arrester.
The inlet to a vapor destruction unit must—
Have a liquid seal that meets the requirements of paragraph (e) of this section, except as specified by paragraph (b)(3) of this section; and
Have two quick-closing stop valves installed in the vapor line. One of them must be installed upstream of the detonation arrester required by paragraph (c)(2) of this section. The quick-closing stop valves must—
Close within 30 seconds after detection of a condition that requires the closing of these two quick-closing stop valves by a control component required by this subpart for a vapor control system (VCS) with a vapor destruction unit;
Close automatically if the control signal is lost;
Have a local valve position indicator or be designed so that the valve position is readily determined from the valve handle or valve stem position; and
If the valve seat is fitted with resilient material, be a Category A valve as defined by 46 CFR 56.20-15 and not allow appreciable leakage when the resilient material is damaged or destroyed; and
Instead of a liquid seal as required by paragraph (b)(1) of this section, have the following—
An anti-flashback burner accepted by the Commandant and installed at each burner within the vapor destruction unit; and
A differential pressure sensor that activates the quick-closing stop valves as required by paragraph (b)(2) of this section upon sensing a reverse flow condition.
A vapor destruction unit must—
Not be within 30 meters (98.8 feet) of any tank vessel berth or mooring at the facility;
Have a detonation arrester fitted in the inlet vapor line; and
Activate an alarm that satisfies the requirements of 33 CFR 154.2100(e) and shut down when a flame is detected on the detonation arrester.
When a vapor destruction unit shuts down or has a flame-out condition, the vapor destruction unit control system must—
Activate and close the quick-closing stop valves required by paragraph (b)(2) of this section;
Close the remotely operated cargo vapor shutoff valve required by 33 CFR 154.2101(a); and
Automatically shut down any vapor-moving devices installed in the VCS.
If a liquid seal is installed at the inlet to a vapor destruction unit, then—
The liquid used in the liquid seal must be compatible with the vapors being controlled;
For partially or totally soluble cargoes that can polymerize in solution, there must be an adequate amount of inhibitor in the liquid seal;
The liquid seal must be compatible with the design of the VCS and must not contribute to the flammability of the vapor stream; and
The liquid seal must have a low-level alarm and a low-low level shutdown.
Notes, amendments, and revision history
Source
Source: USCG-1999-5150, 78 FR 42618, July 16, 2013, unless otherwise noted.
Authority
Authority: 33 U.S.C. 1321(j)(1)(C), (j)(5), (j)(6), and (m)(2); 46 U.S.C. 70011, 70034; sec. 2, E.O. 12777, 56 FR 54757; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.2. Subpart F is also issued under 33 U.S.C. 2735. Vapor control recovery provisions of Subpart P are also issued under 42 U.S.C. 7511b(f)(2).