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> From: DOUG MATHIESON <mathieson@go*.ne*>
> Subject: TRANSFILLING OF EMPTY O2 CYLINDER
> I am transfilling O2 tanks at work and occasionally we get a empty
> cylinder come back for filling with the valve left open. We have a
> suction unit in the transfilling system to remove any residual O2 before
> filling.They seem to feel that this suction will remove contaminants
> from a empty tank.
>
> I have been refusing to fill any tank that comes back empty due to
> possible contamination.
>
> I would appreciate any collaboration I can get on this matter outlining
> the sources of contamination and consequences involved. I am asking for
> help in this matter because as of now i am just one lone voice and I
> know you can explain the reasons more technically and eloquently than I
Doug,
While it is unlikely that there will be any contamination in
the tank, the possibility still exists, and the customer knows they
should leave some gas in the tank and the valve closed. So I have
a firm policy of visually inspecting every tank that comes into
the store empty with the valve open. With the exception of
doubles, the visual inspection only takes about 5 minutes, I do it
while they wait, and the charge for the visual inspection encourages
the customer not to do it again (it's kind of like a speeding ticket).
Ted
Ted Green (Owner)
Tidewater Aquatics (Dive Store)
Salisbury Maryland USA
Master Instructor SSI #178
Trimix Instructor TDI #029
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