All P&I Club bulletins & Circulars regarding Calcium Hypochlorite is linked here below
Loss Prevention Bulletins
759 – 04/11 – Calcium Hypochlorite frequently asked questions – International Group of P&I Clubs
108 -09/99 – Calcium Hypochlorite (Hydrated) – Update
57 – 07/98 – Calcium Hypochlorite (Hydrated) – Threat of Explosion – Urgent Preliminary Advice
Club circulars
Circular 13/00: Carriage of Calcium Hypochlorite
Carefully to Carry documents
Cat, Felis catus, is a domesticated carnivorous animal.
But CAT is Critical Ambient Temperature which is a very important one representing thermal stability of Calcium Hypochlorite.
Much has been said and written about dangers of Calcium Hypochlorite. Many ships had experienced powerful explosion and subsequent fire resulting in total loss of vessel due to this chemical.
The lowest ambient temperature at which the runaway reaction occurs is the critical ambient temperature (CAT) of the material.
Quote from U.K. PnI Club
“Examples in the literature show that Professor Brian Gray determined that the critical ambient temperature for a 40 kg keg of CH containing 8.5% moisture, UN2880, is about 55°C whereas for a 200kg drum of the material it is about 44°C. It follows from this that a container load of 200kg drums will have a CAT lower than 44°C because the drums will thermally interact with each other within the container.”
Click here to read more on safe carriage of calcium hypochlorite
Certain Dangerous Goods require mandatory transport in reefer containers due to safety reasons. These are some of the Self-reactive Substances under Class 4.1 and some of the Organic Peroxides, Class 5.2. This requirement is listed in column 16 of DG List in chapter 3.2 and respective sub sections in chapter 2.4 & 2.5 of IMDG Code (35-10).
Let us look at the provisions of other dangerous goods which do not require refrigerated containers but are offered sometimes as temperature controlled.
So what goods which do not require a reefer is sometimes transported in reefer? Generally these are Perfumes ( UN 1266), Safety Matches ( UN 1944), Paint (UN 1263), Lithium Batteries (UN 3090,3091,3480,3481). Some shippers transport these in live reefers to maintain the product quality. Of course Calcium Hypochlorite require live reefers by most of the shipping lines due to its bad past.
IMDG Code has certain provisions for Dangerous Goods in reefers for commercial reasons, these are specifically related to Flammable Gases ( Class 2.1) and Flammable liquids ( Class 3). When Flammable liquids having flashpoint less than 23 °C c.c is transported in live reefer then
1/ Substance shall be precooled and
2/ Transported at a temperature at east 10 Deg C below its flashpoint
Or explosion proof reefer is required.
At any moment during transport In case the reefer fails then power supply shall be disconnected and must not be switched on again.
No line will accept flammable gas in live or non-live reefers. ( For full details refer 7.7 of IMDG Code)
IMDG Code Compliance Centre 