Your Packing Standard Was Written for a 30-Day Voyage. It Is Now a 45-Day Voyage.

A packing standard is a function of voyage length

In 2026 most liner operators still treat the Cape of Good Hope as the default Asia–Europe routing. The detour adds roughly 3,500 nautical miles and 10–14 days. Asia–Europe rates remain 25–40% above pre-crisis levels, and a cargo war-risk surcharge of USD 50–100 per TEU has become a permanent line item (Xeneta / Maritime Gateway, 2026).

For anyone who buys or builds fixed equipment, all of that reduces to one operational sentence: the vessel is going to sit inside a hot, humid steel box for two more weeks than the packing standard assumed.

The pattern is familiar from the manufacturing side. A vessel passes hydrotest. Dimensions are correct. The document package is complete and the third-party inspector has signed everything. Nine weeks later the box is opened at site and there is rust bloom across the gasket face, condensate in a nozzle bore, and a gouge through the topcoat.

Almost none of that is a manufacturing defect. It is a preservation defect, and preservation is the most underspecified part of most purchase orders.

What is actually attacking the equipment

From the moment the unit is sealed into a container or onto a flat rack it faces three distinct damage classes. Miss one layer and one of them has an open door.

Mechanical shock and movement. Lifting, stacking, ship roll and pitch, road transport at the far end. Large vessels and exchangers have a high centre of gravity and awkward geometry. They are not pallet cargo, and standard dunnage does not hold them.

Moisture and condensation. The diurnal temperature swing inside a container is severe. Warm humid air condenses on cool steel overnight, evaporates by afternoon, and condenses again. This is container rain, and over a long voyage it happens dozens of times.

Corrosion. Salt aerosol plus condensate plus time. A machined carbon steel flange face will show visible rust in days under those conditions, not weeks.

The Red Sea diversion does not add a fourth threat. It does something more insidious: it multiplies the third variable in all three — time. Thirty days becomes forty-five. The number of condensation cycles rises by half. Salt exposure rises by half. Desiccant correctly dosed for a 30-day route saturates around day 32 and then sits inert while the equipment corrodes for another fortnight.

The six layers

Layer 1 — ISPM-15 crate or steel base frame

What it stops: mechanical shock and displacement. This is the foundation, and if it fails nothing above it matters.

Large pressure vessels and heat exchangers have a high, often offset centre of gravity. The design is a steel base frame with a timber crate, or for heavier and more irregular units an all-steel frame, and the critical engineering step is that temporary supports and saddles are checked against sea-transport accelerations, in the order of 0.8g longitudinal and 0.5g transverse. The unit must not move under ship motion.

Any solid wood in that packaging has to be ISPM-15 heat-treated and stamped with the IPPC mark. Without the stamp, customs authorities in a long list of countries will refuse entry and in some cases send the box home. An all-steel frame sidesteps the requirement entirely but costs more and adds freight weight — a trade-off worth making consciously rather than by accident.

Centre of gravity, lifting points and "this way up" must be marked clearly on the outside. Rigging crews at destination read the crate, not the drawing package.

Where it goes wrong: supports designed for a factory floor rather than a rolling ship; a missing IPPC stamp on one piece of dunnage added at the last minute.

Layer 2 — VCI vapour corrosion inhibitor

What it stops: corrosion on surfaces nobody can reach.

VCI material releases a vapour that forms a molecular protective film on metal surfaces. Its value is geometric rather than chemical: it reaches nozzle bores, flange bolt holes and internal cavities that no brush-applied coating will ever cover. Machined faces, sealing faces and nozzle interiors are the priority surfaces. The practical implementation is a full VCI liner bag around the unit, opened on arrival.

Where it goes wrong: VCI applied to external surfaces only, leaving nozzle interiors and bolt holes unprotected; a liner bag punctured during crating and never checked.

Layer 3 — Desiccant and moisture barrier

What it stops: the humidity that drives the condensation cycle.

VCI handles corrosion chemistry; desiccant handles the water. The barrier is an HDPE or foil-laminate film that limits vapour transmission, with silica gel dosed by enclosed volume inside it.

This is the layer the longer voyage breaks. Desiccant quantity is a function of enclosed volume, barrier permeability and voyage days. A dose calculated for thirty days does not stretch to forty-five; it saturates and stops working. Recalculating the dose against the actual routing costs very little and closes the gap directly.

A humidity indicator card inside the barrier lets the receiver see the state of the enclosure at opening without any instrumentation.

Where it goes wrong: dosing by habit rather than by calculation; barrier film sealed around a sharp edge that opens in transit.

Layer 4 — Nozzle and flange face closure

What it stops: water and debris ingress, and mechanical damage to sealing faces.

An open nozzle is a water inlet. Small bores take plastic caps; large openings take timber covers or steel blinds. Sealing faces take protective pads, because a machined face that is knocked in transit usually means re-machining on site, and site machining of a flange face is slow and expensive work.

Closures must be clearly marked so that none is left in place at commissioning. A blind left in a line during a pressure test is a genuine hazard, not just an inconvenience.

Where it goes wrong: tape over a nozzle instead of a cap; unmarked blinds; protective pads omitted on the assumption that the gasket will cover any damage.

Layer 5 — Nitrogen blanketing

What it stops: internal corrosion where the internal surface matters.

The internal volume is filled with dry nitrogen at slight positive pressure before final closure. The nitrogen displaces oxygen and moisture and holds an inert environment for the whole voyage. The valve is tagged with the blanket status and pressure so the receiver knows what they are opening.

This layer is not warranted on every unit. It earns its cost on high-value equipment and on units whose internal surface is critical — polished vessels, nickel alloy bundles, anything where internal re-cleaning at site is impractical.

Where it goes wrong: blanketing applied without a pressure indicator, so nobody can tell whether it held; specified on units that did not need it while omitted on units that did.

Layer 6 — Bracing, lashing and shock monitoring

What it stops: movement inside the crate — and it creates the evidence trail.

Timber bracing, steel bracing and lashings together, until the unit will not move. Temporary supports checked against the same 0.8g and 0.5g accelerations. Centre of gravity and lifting points marked on the crate and recorded in the shipping documents.

The monitoring half is what makes a claim possible. Shock indicators record abnormal impact in transit, change colour on impact and cannot be reset. Tilt indicators record whether the unit was laid over or tipped. Both are visible at opening without any strip-down, and both leave permanent evidence that supports a claim and traces where in the chain the damage occurred.

Where it goes wrong: indicators fitted but not recorded on the packing list, so nobody at destination knows to look at them.

How to verify at unpacking that each layer worked

Specification is only half the job; the other half is checking at the far end, in an order that preserves evidence.

1. Before opening anything, photograph the crate exterior — markings, seals, and both indicators. Once the crate is open, the external evidence is gone.
2. Read the shock and tilt indicators and record them on the receiving report, whether or not they have triggered. A negative reading is evidence too.
3. Read the humidity indicator card inside the barrier before disturbing the enclosure. This tells you whether the desiccant held for the voyage actually flown.
4. Check the nitrogen blanket pressure at the valve tag before venting, where a blanket was specified.
5. Inspect the sealing faces and nozzle bores first, because these are the surfaces where damage is expensive and where preservation failures show up earliest.
6. Account for every closure and blind against the packing list before the unit goes to installation.

Any deviation should be raised while the crate and its contents are still as delivered. A preservation claim raised after the unit has been moved to a laydown area and rained on is very difficult to substantiate.

What to put in the purchase order

Most preservation failures trace back to a purchase order that said "seaworthy packing" and nothing else. That phrase is not a specification. A workable one names five things:

• The routing and expected voyage duration, because desiccant dose and preservation grade both follow from it.
• Which layers apply to which items, particularly whether nitrogen blanketing is required and on what.
• The marking requirements — centre of gravity, lifting points, orientation, and whether indicators are fitted.
• The storage condition at destination, because equipment intended to sit outdoors for six months before installation needs a different preservation grade from equipment going straight into a building.
• The verification procedure at opening, so that the receiving party knows what to photograph and record before disturbing anything.

Corrosion and moisture ingress are functions of time. When the routing changes, the packing standard has to be recalculated rather than reused.