Regulations for Subchapter D cargoes require that venting for cargo tanks in which only grades D or E liquids are to be transported shall, as a MINIMUM, be of which type? (tank barge constructed on or after July 1, 1951)
• 46 CFR Subchapter D requirements for tank barges built on or after July 1, 1951 • Venting arrangements for cargo tanks carrying only Grade D and Grade E flammable/combustible liquids • Difference between open vents, gooseneck vents, vent headers, and pressure-vacuum relief devices
• Identify which venting options are typically required for more hazardous (higher vapor pressure / lower flash point) cargoes, and which are acceptable for less hazardous grades like D and E • Think about whether the regulation is asking for a simple minimum venting arrangement or a more complex safety system intended for higher risk cargoes • Compare which choices serve an entire system of tanks versus those that apply to each individual tank
• Verify in 46 CFR Subchapter D which venting arrangements are specifically tied to certain cargo grades (A, B, C vs D and E) • Check whether flame screens or pressure-vacuum relief valves are mandated only when vapors present a higher explosion risk or for tanks required to be closed • Confirm if for Grade D/E only tanks on barges after July 1, 1951, the regulation allows a more basic vent type as the minimum requirement
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