Packing & Preservation for Overseas Shipment: Moisture, Rust & Shock Control
By Qiangbin Chu · Sales Manager & Operations Lead, Suzhou Lmart Energy Equipment
Key Takeaways
- Overseas equipment delivery failures are rarely about weight — they stem from moisture ingress, machined surface corrosion, and inadequate handling controls.
- A complete packing checklist covers four areas: moisture control, rust prevention, shock/handling control, and a photo-based evidence pack for receiving.
- Without preservation records and photos, receiving teams often quarantine equipment "just in case" — adding weeks to the installation schedule.
- Lmart includes a packing and preservation record with photo documentation as standard in every overseas shipment release package.
Why Overseas Delivery Fails (And It Is Not About Weight)
Overseas delivery does not fail because the heat exchanger is "heavy." It fails because moisture gets in, machined surfaces rust, or lifting is done wrong and no one can prove what happened. The result: site quarantine, re-inspection, surface rework, and project delays that could have been prevented with a systematic packing and preservation approach.
This guide is a practical EPC checklist that ties packing and preservation to ship-release evidence — so receiving at the destination site is smooth and the equipment can proceed directly to installation.
Moisture Control
Moisture is the primary enemy during ocean freight. Heat exchangers and pressure vessels shipped from China to Middle East, Southeast Asian, or South American project sites can spend 4–8 weeks in transit, often passing through tropical and humid environments. Without proper moisture control, internal surfaces can develop pitting corrosion, and insulation contact points become corrosion initiation sites.
- Seal all nozzles and instrument openings with steel blinds, plastic caps, or bolt-on covers
- Install desiccant bags inside the vessel with moisture indicator cards visible from outside
- Apply moisture barrier wrapping (VCI film or polyethylene) for extended transit or storage
- Include storage requirements note: maximum duration, environment conditions, and re-inspection intervals
For equipment expected to be stored on site for more than 3 months before installation, the preservation specification should include nitrogen blanketing requirements and periodic inspection intervals. This must be agreed at the purchase order stage and reflected in the preservation procedure.
Rust Prevention for Machined Surfaces
Flange faces, tube ends, and machined gasket surfaces are the most vulnerable areas during transit. A single rain event or condensation cycle during shipping can cause surface corrosion that requires re-machining — adding cost and schedule delay at the installation site.
- Protect machined flange faces with rust-preventive coating (e.g., Tectyl or equivalent) plus plastic flange protectors
- Protect exposed tube ends with individual tube plugs or sheet capping
- Apply appropriate rust preventive and wrap method to all carbon steel external surfaces
- Attach clear "REMOVE BEFORE INSTALLATION" labels on all protective coverings
- Never apply silicone-based rust preventives on surfaces that will contact gaskets — this can cause gasket sealing failures.
- For stainless steel equipment, avoid chloride-containing protective products — use chloride-free preservatives only.
Shock and Handling Control
Heavy equipment in transit is subject to dynamic loads during crane lifts, truck transport, and vessel loading/unloading. Without proper bracing and handling controls, nozzles can be damaged, internals can shift, and saddle welds can crack — all difficult to detect without re-inspection at site.
- Mark Center of Gravity (COG) clearly on the equipment and on shipping cradles/saddles
- Label all designated lifting points with Safe Working Load (SWL) capacity
- Include lifting procedure or rigging diagram with the shipping documentation
- Install transport bracing for vulnerable nozzles, piping connections, and internals
- Apply shock indicators (ShockWatch or equivalent) and tilt indicators on high-value or fragile equipment
| Protection Area | Method | When Required |
|---|---|---|
| Nozzle openings | Steel blinds or bolted caps | All overseas shipments |
| Flange faces | Rust preventive + plastic protectors | All overseas shipments |
| Internal surfaces | Desiccant + VCI film + sealed openings | Carbon steel internals, >2 weeks transit |
| Tube ends | Individual plugs or sheet capping | Exposed tube bundles |
| Nozzle bracing | Steel bracing welded to saddle/cradle | Nozzles >DN150 or unsupported piping |
| Shock/tilt monitoring | ShockWatch + TiltWatch indicators | Equipment >$100K or fragile internals |
Evidence Pack: What EPC Receiving Teams Need
The most common receiving failure mode is moisture ingress plus missing preservation evidence. Without records and photos, receiving teams often quarantine equipment "just in case" — adding weeks to the project schedule while waiting for supplier confirmation or re-inspection.
- Packing list with item-by-item preservation method documented
- Preservation record form — showing what was applied, when, and by whom
- Photo set: sealed openings, surface protection application, COG/lifting markings, transport bracing
- Document register updated at ship release to confirm all packing/preservation evidence is included
Without preservation records and photos, receiving teams quarantine equipment "just in case." A 20-minute photo documentation effort at the factory prevents 2–3 weeks of site delay.
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How Lmart Handles Overseas Packing & Preservation
At Lmart, packing and preservation is managed as an integral part of the quality control process, not an afterthought. Every overseas shipment follows a standardized preservation procedure that is reviewed at the project kick-off meeting and tailored to the destination environment and expected storage duration.
Our standard practice includes: nitrogen purging for carbon steel internals, VCI wrapping for all machined surfaces, photo documentation at each stage (sealing, coating, bracing, final loading), and a signed preservation record included in the vendor data book. For projects shipping to tropical or high-humidity destinations, we apply additional moisture barrier protection and include humidity indicator cards visible without opening the packaging.
With equipment exported to 50+ countries across the Middle East, Southeast Asia, South America, and Northern Europe, Lmart has developed destination-specific packing protocols that account for local climate, port handling conditions, and typical storage durations before installation.
Summary
Effective packing and preservation for overseas shipment requires systematic attention to four areas: moisture control (sealed openings, desiccant, VCI wrapping), rust prevention (machined surface protection, chloride-free products for stainless), shock and handling control (COG marking, lifting instructions, transport bracing, shock indicators), and a photo-based evidence pack that allows receiving teams to verify equipment condition without quarantine delays. Including the preservation record in the final release package is just as important as the hydrotest report.
Lmart holds ASME U-Stamp, PED/CE, and 6 classification society approvals (DNV, BV, CCS, ABS, LR, NK).
103-mu campus in Zhangjiagang · 38,000 m² workshop · 300+ staff · 15,000 T/year capacity
Last reviewed: December 20, 2025 · Technical accuracy verified by Lmart Engineering Dept.
Frequently Asked Questions
What is the most common receiving failure mode for overseas equipment?
Moisture ingress combined with missing preservation evidence. Without records and photos documenting the packing and preservation steps performed at the factory, receiving teams at site often quarantine equipment "just in case" — adding 2–3 weeks to the installation schedule while waiting for supplier confirmation or arranging re-inspection.
How long can equipment be stored on site before preservation needs renewal?
This depends on the preservation specification agreed at purchase order stage. As a general guideline: standard VCI wrapping with desiccant is effective for 3–6 months in moderate climates. For storage beyond 6 months, or in tropical/high-humidity environments, nitrogen blanketing and periodic re-inspection (typically every 3 months) should be specified. The preservation record should include the recommended re-inspection interval.
Should shock indicators be used on all overseas shipments?
Shock indicators (e.g., ShockWatch) and tilt indicators (TiltWatch) are recommended for high-value equipment (typically >$100K), equipment with fragile internals (tube bundles, baffles), or when the logistics route involves multiple handling points. For standard heavy-wall pressure vessels shipped on flat-rack containers with proper saddle mounting, shock indicators may not be necessary but are inexpensive insurance.
What rust preventive should be used on stainless steel flange faces?
For stainless steel equipment, always use chloride-free rust preventives to avoid pitting corrosion. Common options include chloride-free VCI paper/film, food-grade mineral oil, or specific stainless-safe products like Cortec VpCI-368. Never use standard carbon steel rust preventives (which often contain chlorides) on stainless steel or nickel alloy surfaces. The product data sheet should confirm chloride-free formulation.
Does Lmart provide photo documentation with every overseas shipment?
Yes. Lmart's standard overseas shipment package includes a photo-based preservation record documenting: sealed nozzle openings, rust preventive application on machined surfaces, COG and lifting markings, transport bracing installation, and final loading onto transport. These photos are included in the vendor data book and are available digitally for the receiving team before equipment arrives at site.
What packing method does Lmart use for heat exchanger tube bundles?
Removable tube bundles are shipped with individual tube-end plugs, VCI wrapping on the entire bundle, and custom wooden or steel cradles with adequate support points to prevent sagging. Baffle plates are braced to prevent shifting. For bundles with titanium or alloy tubes, additional chloride-free wrapping is applied. The bundle is secured to the cradle with steel banding and corner protectors to prevent strap damage during transit.
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