What is a seaworthy packaging system?
A coordinated stack of preparation, corrosion control, moisture barrier, desiccant, structural packaging, restraint and documentation designed for ocean transit risks.
Which layer fails most often in practice?
Moisture and preparation failures are extremely common: wet metal sealed into strong crates, or crates without sized desiccant on tropical sailings. Structural failures dominate when base design ignores weight and lift geometry.
Can I skip the barrier bag if I use container desiccant?
Container desiccant improves box climate but does not replace a sealed dry zone around critical metal on long humid routes. High-value machines usually need both in-pack and container-level moisture strategy.
Where does VCI sit in the stack?
VCI is the metal surface layer (L1). It works best inside a closed volume (L2) with controlled humidity (L3). See what is VCI packaging.
How do I size desiccant for a machine case?
From free air volume inside the sealed barrier, hygroscopic materials present, and route duration/climate, using industrial Desiccant Unit methods such as DIN 55473 practice. Record the count on the packing instruction.
Is CTU Code part of packaging or stowage?
Both interact. Packaging must provide clear lift and restraint interfaces; stowage must secure the unit in the container or on the conveyance. Incomplete stowage can defeat a good case.
Do all layers apply to spare parts cartons?
Scaled down: VCI bag + desiccant + strong outer pack + documentation still apply. Full machine skids may not. Match layer intensity to cargo value and exposure.
Who owns the packing instruction?
The packaging engineer responsible for the consignment. When BENZ supplies a complete export pack, the instruction covers materials and methods as one system rather than three vendor sheets.
Can desiccant and VCI be used together?
Yes, and they usually should be for bare metal ocean cargo. Place VCI on metal and desiccant inside the sealed free volume. Do not leave desiccant outside the barrier. See co-design section above and desiccant vs VCI.
Why isolate metal from wooden crates?
Wood can hold moisture and organic chemistry that accelerates corrosion on bright metal. Use liners, VCI or barrier materials so machined surfaces do not rest on damp timber while still using ISPM-15 wood for structure.
Is industrial shrink wrap a full seaworthy system?
No. Shrink wrap is a weather and unitisation tool, especially for open or irregular cargo. It does not replace sealed free-volume design, sized desiccant, metal protection and load-rated structure for capital machines on long humid voyages.
How does this page differ from “what is seaworthy packaging�
The definition page explains the concept, threats, gates and RFQ. This system page is the engineering map: which layer owns which risk, how layers co-design, and how intensity changes by cargo and mode.
What should appear on a system packing method note?
Voyage mode and weeks; metal list; VCI grade and placement; barrier type; desiccant unit count and free-volume basis; structure/ISPM-15 callout; restraint notes; mark plan; packing list reference; photo set for high-value cargo.