I had recently acquired a CO2 cylinder which has the below marking and after some on-line research I found that the meaning is as follows: CO2 - 2 TP250 V3.0 W6.13 BXXXX XXX 2011/03 Marking Meaning : CO2-2: Filling gases - Carbon Dioxide TP250: Test pressure - 25MPA V3.0: Volume - 3.0L W6.1: Weight - 6.1KG BXXXX XXX: Product No. 2011/03: Hydrostatic Test Date - CO2 cylinders needs hydrostatic testing every 5 years
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