46 CFR 39.40-3 - Design and equipment for vapor balancing

§ 39.40-3 Design and equipment for vapor balancing—TB/ALL.
(a) If the cargo tanks on a vessel discharging cargo and a vessel receiving cargo are inerted, the service vessel must:
(1) Have a means to inert the vapor transfer hose prior to transferring cargo vapor; and
(2) Have an oxygen analyzer with a sensor or sampling connection fitted within 3 meters (9.74 ft.) of the vessel vapor connection which:
(i) Activates an audible and visible alarm at a location on the service vessel where cargo transfer is controlled when the oxygen content in the vapor collection system exceeds 8 percent by volume;
(ii) Has an oxygen concentration indicator located on the service vessel where the cargo transfer is controlled; and
(iii) Has a connection for injecting a span gas of known concentration for calibration and testing of the oxygen analyzer.
(b) If the cargo tanks on a vessel discharging cargo are not inerted, the vapor collection line on the service vessel must be fitted with a detonation arrester that meets the requirements of 33 CFR 154.822(a) located within 3 meters (9.74 ft.) of the vessel vapor connection.
(c) An electrical insulating flange or one length of non-conductive hose must be provided between the vessel vapor connection on the service vessel and the vapor connection on the vessel being lightered or topped-off.
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United States Code
U.S. Code: Title 46 - SHIPPING
Presidential Documents

Executive Order ... 12234

Title 46 published on 2014-10-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 46 CFR Part 39 after this date.

  • 2015-09-10; vol. 80 # 175 - Thursday, September 10, 2015
    1. 80 FR 54418 - Marine Vapor Control Systems
      GPO FDSys XML | Text
      Final rule; information collection approval.
      The collection of information requirements contained in the July 16, 2013 final rule (78 FR 42596) and approved by the OMB as an amendment to existing collection of information, control number 1625-0060, will be enforced beginning September 10, 2015. The requirements include provisions for VCS certifications, recertifications, periodic operational reviews, approval requests, reviews of operating manuals, failure analyses, operational review letters, and relabeling. These requirements aid the Coast Guard and industry in ensuring industry's regulatory compliance and safe practices in connection with VCSs.
      33 CFR Parts 154, 155, and 156