$0\mathrm{.}2\mathrm{.}1$ General

A container must not be used in the handling, offering for transport, or transporting of dangerous goods unless Clause $4\mathrm{.}4$ or Schedules $1$ and $2$ of Appendix E specify that the container is permitted to contain the dangerous goods and the container and dangerous goods conform to all other applicable requirements set out in this standard. In the case of a tank car, the dangerous goods must be specified on the Certificate of Construction, Form AAR $42,$ or by addendum on Form R $1.$

$10\mathrm{.}2\mathrm{.}4$ Localized dents and buckles

Except for dents or buckles that are in the heads of the tank car, a tank car that has a localized dent or buckle in its shell must not be used to handle, offer for transport or transport dangerous goods if:

$1.$ the localized dent or buckle in the tank shell has a depth greater than $19$ mm $(3/4$ in$.)$ at its deepest point, when that depth is measured relative to the surrounding un$-$deformed external surface of the tank shell; or

$2.$ any portion of the localized dent or buckle in the tank shell is within $610$ mm $(24$ in$.)$ of the longitudinal tank centre line at the bottom of the tank and the dent or buckle has a depth greater than $13$ mm $(1/2$ in$.)$ at its deepest point, when that depth is measured relative to the surrounding un$-$deformed external surface of the tank shell.

Standards courtesy of Transport Canada

What is the maximum allowable depth of a localized dent on a tank shell?

$$ It depends on the location of the dent

$19$ mm

$13$ mm

$$ All of the choices are incorrect