in MCA Oral Exam Questions What is the maximum period of validity of an OSV CoF? by Ship Inspection 15.5k Views 5 years. Share this: See more Previous article What are the requirements in relation to the OSV CoF when the vessel is constructed to carry pollution hazard only substances, as defined in the LHNS Guidelines? Next article What should an OSV CoF indicate with respect to cargoes? Written by Ship Inspection Leave a ReplyCancel replyYou must be logged in to post a comment.