Delta_P:
Where did you get that number of 11 tanks? All I can find in the TDG regs is a 30 kgs. personal use exemption. One tank is 17 kgs., so that can't be right either.
Same thing in B.C.
OK This gets confusing so hang on....
1.15 Exemption for Personal Use
(1) These Regulations do not apply to dangerous goods in transport on a road vehicle, a railway vehicle or a ship on a domestic voyage, if the dangerous goods
(a) are transported between
(i) a retail outlet and the residence of the purchaser,
(ii) a retail outlet and the purchaser's place of use,
(iii) the residence of the purchaser and a place of use, or
(iv) two residences;
(b) are contained in one or more means of containment each of which has a gross mass less than or equal to 30 kg and is designed, constructed, filled, closed, secured and maintained so that under normal conditions of transport, including handling, there will be no accidental release of dangerous goods that could endanger public safety;
(c) are not for resale or for commercial or industrial use; and
(d) are in a quantity and concentration available to the general public at retail outlets.
Examples of retail outlets are hardware stores, automotive industry stores, pool supply stores and farm co-ops.
(3) Subsection (1) does not apply to
(a) dangerous goods in a quantity greater than 150 kg gross mass that are in transport on a road vehicle, a railway vehicle or a ship on a domestic voyage;
SO 1.15.1(b) sets the Maximum weight of any individual container at 30 kg. The total amount is set in 1.6
1.6 Quantity Limits in Columns 8 and 9 of Schedule 1
(1) If there is a number shown in column 8 or 9 of Schedule 1, that number is a quantity limit and a person must not handle, offer for transport or transport, by the means of transport set out in the heading of that column, a consignment of dangerous goods that exceeds the quantity limit in that column. A consignment of dangerous goods exceeds the quantity limit when the dangerous goods
(a) ...;
(b) ...;
(c) if a gas, including a gas in a liquefied form, are contained in one or more means of containment the total water capacity of which is greater than the number when that number is expressed in litres;
Look up schedule 1 for UN1002
Col. 9 Passenger Carrying Road or Rail Index is 75 So you can carry as many tanks as it takes to hold 75 l of water (no matter what pressure....) An AL80 holds about 678 cu in (From the Luxfer Spec sheet) which works out to just over 11.11 l . So I find I shouldn't listen to the last guy to work this out and do it myself...find out as well that the number is closer to 5 tanks if you are by your self and if there are two people in the car (because of course you are diving with your buddy. it becomes 11.
Clear?