46 C.F.R. § 39.20-13 High and low vapor pressure protection for tankships—T/ALL.
Title 46 - Shipping
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.
Title 46: Shipping
PART 39—VAPOR CONTROL SYSTEMS
Subpart 39.20—Design and Equipment
§ 39.20-13 High and low vapor pressure protection for tankships—T/ALL.
