er 062711173305 side walls defrosting

8/3/2019 ER 062711173305 Side Walls Defrosting

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CAUSES OF PARTIAL THAWING

Factors contributing to partial thawing of frozen product(e.g. cooked shrimp) load against the side walls

Cargoes being stuffed into warm walls containers

Lack of proper cold chain e.g. no or intermittent power from cold

storage to terminal

Load in high ambient conditions (e.g. Thailand, Indonesia & India)

Cargoes may not be pre-cooled to -18C

Partial loading (common in Asia)

Overly tight stowage in flat walls container


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HEAT SOURCES

1. Through the body

2. Through the rear door

3. Warm Products4. Door Seal


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FROZEN CARGOES STOWAGE

Frozen Cargo should always be: stacked as a solid block, leaving no space between packages or

pallets

allow air to circulate around the periphery of the load.

It is necessary to ensure air can circulate under, over and to eachside & end of the stow.

For stowage of produce in containers with flat sided walls, slightlyloose stowage is necessary to facilitate air circulation as overly tight

fit cartons across the space may give rise to hot spot and causeproblems

This stowage pattern allows refrigerated air to circulate evenlyaround the cargo and ensures that heat penetrating the containerdoes not come into contact with the load.


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FLAT & CORRUGATED CONTAINERS

Corrugated walls container aluminum

Flat walls container - MGSS


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Overly tight stowage may beacceptable in corrugated wallscontainers but will lead to hot spot

for flat wall containers


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Stowage to facilitate air flow for flat wall container


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FROZEN CAROGES STOWAGEFROZEN CAROGES STOWAGE

Flat Wall Corrugated Wall

Overly tight fitted

cartons to theside wall causedHot Spot

Slightly loose

stowage to allowair circulationaround the sidewall

Corrugated wallallow proper aircirculation

AmbientHeat

Min 5 mm gap


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FROZEN CARGOES STOWAGEFROZEN CARGOES STOWAGE

Top View

Rear View

Reefe

rM/C

113 x 30 = 3390 Cartons

Overly Tight Stowage


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RECOMMENDED STOWAGERECOMMENDED STOWAGE

Top View

Rear View

Reefe

rM/C

113 x 15 = 1695 Cartons8 x 13 x 15 = 1560 CartonsTotal = 3255 Cartons

Vertical Air Gap Stowage


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SUMMARY OF GOOD LOADING PRACTICES

Recommendations to avert side walls defrosting ofcargoes

Pre-cooling of containers to carrying temperature for loading in proper

cold tunnel facility (e.g. remove heat from the side walls)

Ensure proper cold chain i.e. no or minimum power interruption

Ensure cargoes are pre-cooled to -18oC or below

Use lower carriage temperature e.g. -25oC instead of -18oC especiallyloading at high ambient conditions

Avoid partial loading or leaving containers side walls with direct heatsource for prolong period of time

Ensure no overly tight stowage situation in flat walls container


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DISCLAIMER

APL provides this information as a service to ourcustomers. While every effort has been made to ensurethe accuracy and reliability of the information provided,APL cannot accept responsibility for the materialcontainer herein since it is designed to be of generalapplicability and does not consider specific requirementsand circumstances of individual customers

er 062711173305 side walls defrosting

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