§154.2108. Vapor-moving devices.
33 C.F.R. § 154.2108
Paragraphs (b) and (e) of this section apply only to facilities collecting vapors of flammable, combustible, or non-high flash point liquid cargoes.
Each inlet and outlet to a vapor-moving device that handles vapor that has not been inerted, enriched, or diluted in accordance with 33 CFR 154.2107 must be fitted with a detonation arrester; however, the outlet detonation arrester may be omitted if the vapor-moving device is within 50 times the pipe's diameter of the detonation arrester required by 33 CFR 154.2109(a).
If the vapor is handled by a reciprocating or screw-type compressor in the vapor collection system, the compressor must be installed with indicators and audible and visible alarms to warn against the following conditions:
Excessive gas temperature at the compressor outlet;
Excessive cooling water temperature;
Excessive vibration;
Low lube oil level;
Low lube oil pressure; and
Excessive shaft bearing temperature.
If the vapor is handled by a liquid ring-type compressor in the vapor collection system, it must be installed with indicators and audible and visible alarms to warn against the following conditions:
Low level of liquid sealing medium;
Lack of flow of the liquid sealing medium;
Excessive temperature of the liquid sealing medium;
Low lube oil level;
Low lube oil pressure, if pressurized lubricating system; and
Excessive shaft bearing temperature.
If the vapor is handled by a centrifugal compressor, fan, or lobe blower in the vapor collection system, construction of the blades or housing must be one of the following:
Blades or housing of nonmetallic construction;
Blades and housing of nonferrous material;
Blades and housing of corrosion resistant steel;
Ferrous blades and housing with one-half inch or more design tip clearance;
Nonferrous blades and ferrous housing with one-half inch or more design tip clearance; or
Blades of aluminum or magnesium alloy and a ferrous housing with a nonferrous insert sleeve at the periphery of the impeller.
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).