I attached the wrong file.  Here is the message from Greg
Potts about recertification of ASME tanks:

------------------------------------------------------------
> 20 March 2006; Vanagon list
>
>
>
> I found the following helpful and relevant info on the National
> Propane Gas Association Website:
> http://www.npga.org/files/public/Consumers_Questions.pdf)
>
>> > The 2001 edition of NFPA 58 (the LP-Gas Code) recognizes that
>> > horizontally
>> > oriented cylinders that were manufactured prior to October 1, 1998,
>> > are unable to
>> > be retrofitted with the OPD's.  As a result of this fact, the Code
>> > now exempts these
>> > cylinders from having to be retrofit with OPD valves.  Any such
>> > cylinder must have
>> > a label affixed to it to inform the user and the refiller that an
>> > OPD valve is not
>> > installed.   (Note:  This provision was not contained in the 1998
>> > edition of NFPA 58.)
>
> Maybe you should contact them for some pamphlets you can share with
> your friendly local propane vendor.
> http://www.npga.org
>
>
> Happy trails,
>
> Greg Potts
> Toronto, Ontario, Canada