A fixed pressure-sensing device must be installed as close as practicable to the vessel vapor connection on a tank barge with a vapor collection system. The pressure-sensing device must measure the pressure vacuum in the main vapor collection line and have a pressure indicator located where the cargo transfer is controlled.
source: USCG-1999-5150, 78 FR 42642, July 16, 2013, unless otherwise noted.
cite as: 46 CFR 39.2015