CSA B620 Highway Tank Standards

[IanL403]

I was wondering if any of you are familiar with CSA's standard B620, B621, B622 for Transportation of Dangerous Goods. My company is interested in registering to be a licenced repair/retrofitting and possibly manufacturing facility (in the future) of Liquid Nitrogen Tanks. I am about to purchase the B620-03 and B621-03, but am wondering about the relevance of the "B622 standard: Highway Tanks and Portable Tanks for the Transportation of Dangerous Goods." How similar is the B622 to B621? Is B622 only required if we plan to mount multiple tanks to our trailer?

Also if anyone has experience with the application process, the QC manual, any helpful tips would also be greatly appreciated. Thanks.

Ian