Incompatible threads on the bell onboard gas bottles
- Safety Flash
- Published on 2 December 2000
- Generated on 24 April 2026
- IMCA SF 08/00
- 1 minute read
We have received a report from a diving support vessel (DSV) that during the re certification and testing of the bell onboard gas bottles, it was found that the pillar valves were incompatible with the threads on the bottles.
The bottles were W28.8 x 1¼” according to DIN 477. The pillar valves were ¾” NPT.
Since it is understood that this re-certification was done in the past by a third party test house, contractors may wish to examine their own worksites to check that they do not have a similar problem.
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