339. The master of every ship other than a Bangladesh ship belonging to a country to which the Load Line Convention applies, being a ship of 150 tons gross or upwards, the keel of which was laid before the commencement of this Chapter, or a ship not less than 79 feet (24 metres) in length, the keel of which was laid after such commencement, shall produce to the Collector of Customs from whom a port clearance for the ship is sought-(a) in a case where port clearance is sought in respect of a voyage to a port or place outside Bangladesh, a valid International Load Line Certificate or a valid International Load Line Exemption Certificate; and(b) in a case where port clearance is sought in respect of any other voyage, a valid International Load Line Certificate or International Load Line Exemption Certificate or a valid Bangladesh Load Line Certificate or Bangladesh Load Line Exemption Certificate and port clearance shall not be granted and the ship may be detained until the certificate is so produced.