There are a few things not listed in this thread.
1. DOT portable tanks HAVE to be recertified every 12 years
2. IF you have a out of date or damaged Cylinder, just go to an EXCHANGE service like HD or Lowes. The profit model takes in to account damaged or out of certification cylinders.
3. Below is the DOT law
§ 180.605 Requirements for periodic
testing, inspection and repair of
portable tanks.
(a) A portable tank constructed in
accordance with a DOT specification
for which a test or inspection specified
in this subpart has become due, must
be tested or inspected prior to being returned for transportation.
(b) Conditions requiring test and inspection of portable tanks. Without regard to
any other test or inspection requirements, a Specification or UN portable
tank must be tested and inspected in
accordance with this section prior to
further use if any of the following conditions exist:
(1) The portable tank shows evidence
of dents, corroded or abraded areas,
leakage, or any other condition that
might render it unsafe for transportation service.
(2) The portable tank has been in an
accident and has been damaged to an
extent that may adversely affect its
ability to retain the hazardous materia
