Cylinders (empty receptacles)

The cylinders shall be treated as regulated for their original content unless a certificate or statement is shown (by the shipper) which declares that the cylinders do not container any traces of the former substance. Dedicated empty receptacles such as portable tanks or cylinders which have been used previously for the carriage of dangerous goods are usually returned to the original shipper in an unclean condition. In accordance with the provisions of the SOLAS Convention, 1974, as amended, and the IMDG Books (section 9, paragraph 9.3.6) they are subject to the same requirements as full receptacles and should be declared, handled, marked, labeled, stowed, segregated, documented and reported to authorities in the same way as filled receptacles.

The proper shipping name is either:

"Residue - Last Contained (name of substance in capitals) plus, when applicable, Marine Pollutant"<br< or
"Empty Unclean (name of substance in capitals) plus, when applicable, Marine Pollutant".

See for lashing, Code of Safe Practice for Security. SOLAS Convention, 1974.