This recommended practice is intended to supplement Coast Guard regulations on marine vapor control systems; its scope is limited to terminals and barges fitted with overfill control systems in accordance with Title 33 of the Code of Federal Regulations (CFR) Section 154.812 and Title 46 CFR Section 39.20-9(b)@ respectively. This recommended practice may be used to ensure the compatibility of overfill control system equipment used in non-dedicated tank barge and terminal operations. Purpose The purpose of this recommended practice is to provide guidance to users and manufacturers on the design and operation of barge loading systems and overfill control systems.