Upload
ponidi-p
View
220
Download
0
Embed Size (px)
Citation preview
8/3/2019 ER 062711173305 Side Walls Defrosting
1/11
0
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
8/3/2019 ER 062711173305 Side Walls Defrosting
2/11
1
HEAT SOURCES
1. Through the body
2. Through the rear door
3. Warm Products4. Door Seal
8/3/2019 ER 062711173305 Side Walls Defrosting
3/11
2
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.
8/3/2019 ER 062711173305 Side Walls Defrosting
4/113
FLAT & CORRUGATED CONTAINERS
Corrugated walls container aluminum
Flat walls container - MGSS
8/3/2019 ER 062711173305 Side Walls Defrosting
5/114
FROZEN CARGOES STOWAGE
Overly tight stowage may beacceptable in corrugated wallscontainers but will lead to hot spot
for flat wall containers
8/3/2019 ER 062711173305 Side Walls Defrosting
6/115
FROZEN CARGOES STOWAGE
Stowage to facilitate air flow for flat wall container
8/3/2019 ER 062711173305 Side Walls Defrosting
7/116
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
8/3/2019 ER 062711173305 Side Walls Defrosting
8/117
FROZEN CARGOES STOWAGEFROZEN CARGOES STOWAGE
Top View
Rear View
Reefe
rM/C
113 x 30 = 3390 Cartons
Overly Tight Stowage
8/3/2019 ER 062711173305 Side Walls Defrosting
9/118
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
8/3/2019 ER 062711173305 Side Walls Defrosting
10/11
9
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
8/3/2019 ER 062711173305 Side Walls Defrosting
11/11
10
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