2. 12345 – Cylinder serial number (See Note A)
3. Gas Inc. – Identifying symbol (See Note A)
4. Manufacturing Data:
4-70 – Date of manufacture and original test date.
XX – Inspector’s official mark.
+ - Cylinder qualifies for 110% filling.
5. YY – Manufacturer’s identifying symbol.
6. Retest Markings:
4-75 – Data of first 5 year hydrostatic retest
ABC – Retester identifying symbol.
+ - Cylinder requalifies for 110% filling.
* - Cylinder qualifies for 10-year retest interval.
7. Neck ring owner’s identification.
Notes:
A. Serial number and identifying symbol may be that of
purchaser user or manufacturer.
B. “Spun” or “Plug” must be stamped near DOT mark when an end
closure in the finished cylinder has been welded by the spinning
process or effected by plugging.
C. Markings “5” and “6” are usually shown diametrically
opposite other markings on the cylinder neck.
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