Diesel and gas oil
Diesel and gas oil (UN 1202) are in scope up to flash point 100 deg C. Diesel/fuel oil is in TC 3, so up to 1000 litres may be carried in packages without application of much of the regulations (small load exemption).
Authorisation No 1 PDF link to external website allows certain bowsers (carrying UN 1202 diesel /gas oil only) to be treated as if they are IBCs. The main conditions are
The bowser was made before 10th May 2004
The tank must not be "permanently fixed to a motor vehicle or trailer".
Maximum capacity 3000 litres
Designed for mechanical handling
It shall remain "safe and suitable"
The significance of this is that the bowser can be treated as a package and labelled accordingly, and that if it does not carry more than 1000 litres the small load exemptions apply.
Carriage of Dangerous Goods - How is a bowser defined for the purposes of the regulations and what exemptions apply?
http://webarchive.nationalarchives.g...0/auth1rev.pdf