Section 193.50-1 - Application(a) The provisions of this subpart, with the exception of § 193.50-90 , apply to all vessels, including non-self-propelled vessels of less than 300 gross tons, contracted for on or after March 1, 1968.(b) All vessels other than unmanned barges contracted for prior to March 1, 1968, must meet the requirements of § 193.50-90 .(c) All unmanned barges are exempted from the requirements in this subpart. However, if such barges carry on board hand portable fire extinguishers and semi-portable fire extinguishing systems, then such equipment must be in accordance with this subpart for manned barges.CGFR 67-83, 33 FR 1145, Jan. 27, 1968, as amended by USCG-2012-0196, 81 FR 48301, July 22, 2016