Modified / Converted shipping containers that are required to be shipped for export or continued use at sea have to comply with all International Maritime Organisation (IMO) and Convention for Safe Containers (CSC) regulations.
If the containers are to be transported as regular shipping containers they must also meet the stacking and racking capabilities and remain within International Standards Organisation (ISO) dimensions, be structurally sound, capable of a determined weight carrying, load bearing and certificated and CSC plated as such.
To the cost and frustration of users, many containers that were destined to be further shipped regularly or transported have been converted (and quite professionally), by workshops unfamiliar with shipping regulations and without any thought about amended accreditation.
A CONTAINER THAT IS TO BE LIFTED AND TRANSPORTED IN ITS REGULAR USAGE MUST BE CSC COMPLIANT.
A Shipping Line can and will refuse passage to any non-compliant shipping containers, and where transported by road as part of its regular use a Shipping container must have a valid certification of its Tare & Gross weight capabilities and its ability to be lifted by use of its own intrinsic structure.