Was this pre 2010? It changed in 2010 so make sure you have the right one.
did a little digging
Question: What rules apply to slip tanks or tidy tanks?
Answer: The regulations are called the Transportation of Dangerous Goods Regulations (TDG Regulations for short). Part 5 of the TDG Regulations, states that most containers commonly referred to as "slip tanks" or “tidy tanks” must be certified by the manufacturer. This means that it must be manufactured to the Canadian General Standards Board Standard CAN/CGSB 43.146. There are certain times when a certified tank is NOT required. For example:
1) SLIP TANK FOR DIESEL ONLY (450 L limit – Section 1.33)
A tank with a capacity of 450 L or less does not need to comply with any standard if it only contains diesel. You will find this exemption under of the TDG Regulations.
Please note: You may NOT use this exemption to carry gasoline.
Also, when using this exemption:
2) SLIP TANK FOR GASOLINE AND DIESEL (2000 L limit – Section 1.35)
- you do NOT need a shipping document (Part 3);
- the tank or the truck does NOT need labels or placards (Part 4); and
- you do NOT need to be trained (Part 6).
You will find another exemption for slip tanks under . This exemption says that when you are transporting gasoline or diesel:
You are NOT exempt from Part 5 (means of containment). This means that:
- you do NOT need a shipping document (Part 3);
- you do NOT need to display a UN number on the tank (Part 4); (Note: A label or placard must be still be displayed,) and
- you do NOT need to be trained (Part 6).
- the slip tank (i.e. means of containment) must be certified by the manufacturer;
- tank is subject to periodic inspections by a ; and
- the tank(s) is/are limited to a total maximum capacity of 2000 L.