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TITLE 46 - SHIPPING
CHAPTER I - COAST GUARD, DEPARTMENT OF HOMELAND SECURITY
SUBCHAPTER D - TANK VESSELS
PART 39 - VAPOR CONTROL SYSTEMS
39.20 - 13 - High and low vapor pressure protection for tankshipsT/ALL.
Each tankship vapor collection system must be fitted with a pressure sensing device that senses the pressure in the main vapor collection line, which: (a) Has a pressure indicator located on the vessel where the cargo transfer is controlled; and (b) Has a high pressure and a low pressure alarm that: (1) Is audible and visible on the vessel where cargo transfer is controlled; (2) Alarms at a high pressure of not more than 90 percent of the lowest pressure relief valve setting in the cargo tank venting system; and (3) Alarms at a low pressure of not less than four inches water gauge (0.144 psig) for an inerted tankship, or the lowest vacuum relief valve setting in the cargo tank venting system for a non-inerted tankship.
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