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General guidance for Reefer cargo handling in Port

Reefer containers require special care after they are loaded on board ship. These containers need to be supplied with power, monitored closely for proper function and repaired as required in case of malfunction.The article here is about procedures and guidelines on Reefer cargo handling in Port

ISO Refrigerated Containers

Unlike permanent cold stores or refrigerated ships, where robust equipment is under constant care by qualified personnel, the ISO refrigerated container may travel by several different modes and be in the care of many and varied people. Prior to being despatched to load refrigerated cargo (usually at shippers' premises), the container and its machinery should be subjected to a rigorous examination. External damage received during previous handling must be noted and if necessary repaired­and in cases where the external sheathing is pierced, insulation must be examined with particular reference to the ingress of water. Internally the successful carriage of refrigerated cargo depends on air circulation. All airways and battens should be inspected for damage (particularly floor extrusions where fitted) and fans tested. Cleanliness is of paramount importance and should be dealt with as previously outlined. Doors and their fastenings (including hinges and seals) should receive special attention so that an airtight seal is ensured when the door is closed.

Stowage position on board the vessel will be governed by the commodity carried, its temperature and any other carrying requirements and the type of container (port-hole, air or water cooled integral, or clip-on unit).

Insulated or port-hole containers have now been phased out for refrigerated use although it is not impossible that units may be utilised for general cargo. Port-hole containers were usually 20ft units of 8ft or 8ft 6 ins in height. The major problems with using them for general cargo are the risk of damage to their relatively lightly constructed walls and the possibility of water ingress though ill-fitting vent closures if stowed on deck.

Integral containers with air-cooled machinery and containers fitted with clip-on units are usually stowed on deck, though vehicle decks of Ro-Ro vessels, with appropriate ventilation facilities, may be suitable and acceptable. Water-cooled integral containers must be stowed so that the hose connections are facing the correct way, and the comments (above) regarding 8ft and 8ft 6in container problems also apply.

Inspecting and testing should be carried out by qualified personnel and a certificate issued. Containers may require to be pre-cooled before loading (depending on the type of cargo and local regulations).

When a clip-on unit is fitted, or in the case of integral unit containers, the correct temperature for the cargo to be carried must be set, and the recording chart fitted. Information recorded on the chart should include: When appropriate (e.g. for live fruit cargoes) the air intake/outlet vents should be set open to allow carbon dioxide and other gases to exhaust from the container. When loaded, sealed and delivered to the ship (as in the case of a port-hole unit) there is little that can be done other than an external examination and inspection of the accompanying documents. If a clip-on unit is fitted, thermometers and thermostat settings should be inspected along with its general condition. It is usual for the temperature recording chart to be changed when the container is received on board with the original being retained for future reference.

An integral unit should be similarly checked and stowed so that the machinery is readily accessible. Power supply cables and connectors must be checked. Although largely standardised, differences are sometimes found and converting links should be available. The voltages and transformer settings should be carefully checked before connecting up. Thermostat settings should be checked correct for the contents and the plant operating smoothly. Though major machinery breakdowns are a specialist's concern and unlikely, regular checks for the temperature must be made and variations investigated. The causes may be simple and easily rectified; a blown fuse, a slipping or broken fan belt, thermostat settings altered by vibration. Spares should be carried as attention to minor defects may well save a valuable cargo.

The majority of reefer containers are now constructed with smooth or flat internal walls. Such containers have been found to have a high incidence of cargo damage which has been traced to packaged break-bulk cargo being stowed hard against the smooth walls and thus impeding the flow of air around the block of cargo. Air flow beneath, above and at the door end of the stow is not a problem but is impeded along the side walls and the solid end wall. It is therefore necessary to either stow cartons in a staggered way at the sides or place vertical 10mm wood or polystyrene battens, thus providing a gap through which air can circulate. The problem does not arise with palletised cargo as the pallets themselves hold the cargo away from the walls.

Modern container ships and reefer ships are able to carry very large numbers of integral containers and while systems allow them to be monitored remotely, it may be necessary to have access to the stack to carry out maintenance. The photograph below shows a permanent structure to provide access to refrigerated containers carried on the deck of a reefer ship.

It shall be confirmed beforehand from the terminal foreman/superintendent or local agent whether reefer container plugging / unplugging operation will be performed by ships crew or shore hands.

Reefer handling in port

Reefer containers shall be plugged in and supplied with ships power as soon as practicable after loading. In case it is to be done by shore hands, ships crew shall still closely monitor the operation and confirm that all reefer containers are supplied with power earliest after loading.

Where applicable, cooling water shall be connected and valves opened. This is usually in case of water cooled reefer container units loaded under deck.

Reefer remote monitoring cables shall also be connected whenever equipped and compatible.
Once power supply to the reefer container is confirmed, its condition shall be checked for the following: In case of any discrepancy in temperature or ventilator settings, the local agent / booking line shall be informed and clarifications sought.

Clarification will be given by the booking line (directly or via agent) and only upon written instruction from them, the vessel shall adjust any settings of temperature or ventilation. No temperature or ventilation settings may be tampered with in absence of such written instructions.

In case of a malfunctioning unit, the local agent must be informed and reefer technician arranged for inspection and repair. If the unit cannot be satisfactorily repaired within the duration of port stay, it must be off loaded.

In case of Warm or Hot cargo in a reefer is loaded on board the vessel, it must be first confirmed that the reefer container itself is working well. The shipment may then be accepted after obtaining a letter of guarantee from the shipper through agent and/or from an agent on behalf of the booking line relieving vessel owner/operator from cargo claims arising out of damage to cargo from this fact. This hot cargo statement shall be signed by the terminal and local agent.

If a letter of guarantee is not possible to obtain, an exception list may be prepared on board and signatures of the terminal, local agent and/or any third parties obtained on same to confirm condition of the reefer at time of loading.

Discrepancy report for warm or hot cargo reefer containers must be made out and sent to vessel operators, booking line, local agent and other concerned parties.
In case any reefer container is rejected for loading owing to Temperature / Ventilation discrepancy without clarification, warm/hot cargo without statement, malfunction or any such valid reason, the fact shall be reported to vessel operator and any other parties concerned.

Reefer containers being discharged shall be unplugged from power source only just prior discharge. They shall not be unplugged and left on board awaiting discharge for a long time. The power cables and monitoring cables shall be neatly secured so as to avoid any damage during cargo operations.

Particular care must be taken in operations involving restow of reefer containers in port. When placed back on board and plugged in, their parameters must be rechecked.

All reefer containers on board shall be monitored by checking physically at least Twice daily (am & pm) during vessels stay in port.

The probability of a reefer container being inadvertently switched off or unplugged while vessel is in port does exist. Also a reefer remote monitor alarm may go unnoticed while vessel is in port

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Commodities Shipped In Reefer Containers

Reefer Cargo Temperature Recording

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