{"data":{"id":"us/33-cfr-154.2108","jurisdiction":"us","citation":"33 CFR 154.2108","heading":"Vapor-moving devices.","body":"(a) Paragraphs (b) and (e) of this section apply only to facilities collecting vapors of flammable, combustible, or non-high flash point liquid cargoes.\n(b) 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).\n(c) 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:\n(1) Excessive gas temperature at the compressor outlet;\n(2) Excessive cooling water temperature;\n(3) Excessive vibration;\n(4) Low lube oil level;\n(5) Low lube oil pressure; and\n(6) Excessive shaft bearing temperature.\n(d) 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:\n(1) Low level of liquid sealing medium;\n(2) Lack of flow of the liquid sealing medium;\n(3) Excessive temperature of the liquid sealing medium;\n(4) Low lube oil level;\n(5) Low lube oil pressure, if pressurized lubricating system; and\n(6) Excessive shaft bearing temperature.\n(e) 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:\n(1) Blades or housing of nonmetallic construction;\n(2) Blades and housing of nonferrous material;\n(3) Blades and housing of corrosion resistant steel;\n(4) Ferrous blades and housing with one-half inch or more design tip clearance;\n(5) Nonferrous blades and ferrous housing with one-half inch or more design tip clearance; or\n(6) Blades of aluminum or magnesium alloy and a ferrous housing with a nonferrous insert sleeve at the periphery of the impeller.","path":["Title 33—Navigation and Navigable Waters","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER O—POLLUTION","PART 154—FACILITIES TRANSFERRING OIL OR HAZARDOUS MATERIAL IN BULK","Subpart P—Marine Vapor Control Systems"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-33.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:35Z","sha256":"c8f954a5ac7e1484ac49b69b8ae7019f9673771d5ca9311a1e31579f5ea7597f","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-154.2107","next":"us/33-cfr-154.2109"},"notice":"GroundRules: Original legal text. Not legal advice."}