When equipment is exported to the site, it goes through four stages: land transport, sea freight, unloading, and on-site handling. Each stage can cause damage. Aligning packaging and site preparation in advance helps avoid problems such as discovering after arrival that the site cannot be accessed, power cannot be connected, or liquid nitrogen supply is not available.
Pre-Shipment Packaging and Crating
| Stage | Practice | Purpose |
|---|---|---|
| Internal securing | Fans, doors, and moving parts reinforced or temporarily locked | Prevent displacement and collision during transport |
| Moisture protection | Desiccant placed inside, electrical control cabinet separately sealed | Protect against moisture in high-humidity sea freight environments |
| Outer packaging | Wooden crate or frame made to equipment dimensions, with lifting points and center of gravity marked | Facilitate lifting and avoid stress at incorrect positions |
| Rain protection | Outer rainproof film, protective corners added to crate edges | Protection for open-air storage yards and deck transport |
| Documents with crate | Packing list, manual, electrical diagrams, conformity documents | Needed for customs clearance and installation |
For complete cabinet units such as liquid nitrogen freezer cabinets, the focus is on protecting the door and sealing gasket: stress on the door during transport may cause door seal deformation, and if the seal is not tight after arrival, it will affect insulation performance. Tunnel-type production lines are usually shipped in sections or modules, and on-site assembly is required in module order; interface positions have been verified before shipment.
Container Loading and Transport Methods
Equipment dimensions determine the transport plan. The length of a liquid nitrogen freezing tunnel is the main constraint for container loading; production lines exceeding standard container internal length require sectioning, flat rack containers, or breakbulk vessels. Transport feasibility must be verified at the design stage, not after the equipment is built.
- Full container: Suitable for cabinet-type units and sectioned modules;
- Flat rack or platform container: Suitable for over-length and over-height items;
- Breakbulk: Suitable for very large tonnage or complete production lines.
When confirming the container loading plan, lifting points, center of gravity, securing methods, and the lifting capacity required at the unloading end must be provided simultaneously. The on-site handling passage and door opening dimensions should also be verified with the customer before shipment.
Six Conditions the Customer Site Needs to Prepare in Advance
| Condition | Requirement | Related Stage |
|---|---|---|
| Site and foundation | Level, load-bearing capacity meets equipment weight, maintenance access reserved | Positioning and leveling |
| Power supply | Voltage, frequency, and phases match equipment, sufficient capacity | Electrical installation |
| Liquid nitrogen supply | Storage tank, piping to equipment interface position | First startup |
| Ventilation | Vent position, fan capacity, outdoor discharge path | Operational safety |
| Cooling water (if required) | Water temperature, flow rate, water quality | Refrigeration section |
| Unloading and lifting | Forklift or crane capacity, passage clear height and width | Unloading on arrival |
Among these six items, liquid nitrogen supply and ventilation tend to cause delays: if the equipment is installed but liquid nitrogen has not arrived and ventilation is not connected, startup cannot proceed. It is recommended to lock down the completion dates for these two items before the planned shipment date.
For design points of liquid nitrogen storage tanks and piping, see Liquid Nitrogen Storage Tank and Cryogenic Piping Design Points; for ventilation and oxygen concentration monitoring practices, see Ventilation and Oxygen Concentration Monitoring for Liquid Nitrogen Freezer Cabinets.
Arrival Inspection and Installation Sequence
After arrival, do not open the crate and power on directly. Follow this sequence:
- Visual inspection: Check whether packaging is damaged, whether the cabinet has dents or deformation, and whether the rainproof film is intact;
- Unpacking and inventory: Check the main unit, accessories, spare parts, and documents against the packing list;
- Positioning and leveling: Position according to the layout drawing, level and secure;
- External and internal inspection: Check door seals, insulation joints, and air ducts for transport damage;
- Electrical wiring: Verify nameplate against on-site power supply, confirm reliable grounding;
- Piping connections: Connect liquid nitrogen interfaces, ventilation ducts, and cooling water pipes per drawings and perform leak testing;
- No-load trial run: Measure current, rotation direction, temperature rise, and check for abnormal vibration and noise;
- Full-load trial run: Perform cooling curve and core temperature verification according to the product.
Keep records for every step. For trial run items and acceptance criteria, see On-Site Acceptance and Trial Run for Freezing Equipment.
Common Questions
What if the door seal is deformed during transport?
First perform an airtightness and visual inspection to confirm the degree of deformation. Minor deformation can be adjusted and reset on site; if sealing effectiveness is affected, the seal needs to be replaced. Do not skip this inspection during installation—one missed check can affect insulation and consumption over the long term.
Can the equipment be left standing after arrival without installation?
Minimize open-air storage time. Moisture absorption by insulation materials and dust entering the electrical control cabinet will affect subsequent performance. If temporary storage is necessary, provide rainproof covering and maintain ventilation, and keep the electrical control cabinet door closed and sealed.
What if the on-site door opening is too small for entry?
This is an item that must be verified before shipment. Solutions include disassembling into modules for entry and on-site assembly, or switching to an integral frame but adjusting the layout position. The earlier this is discovered, the easier it is to handle; modifying after the equipment is built is costly.
Who provides the liquid nitrogen tank?
The liquid nitrogen storage tank and supply piping are typically provided by the customer or a local gas supplier. We provide the equipment’s gas consumption, interface specifications, and position requirements. Both parties confirm interfaces during the drawing review stage.
For export projects, send us the destination, equipment model, site conditions, and power supply conditions, and we will provide a crating plan and pre-installation conditions checklist: Contact Kunning Cryo
The packaging and installation practices described in this article are general engineering practices in this industry; equipment transport and interface requirements are cited from Kunning Cryo liquid nitrogen freezer cabinet and liquid nitrogen freezing tunnel technical documents. Data for each model is subject to the corresponding technical parameters.