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Here is the list of tanks and markings that DOT says are *most likely* made
from the alloy:
All DOT 3AL tanks manufactured under one or more of the following exemptions
or Special permits:
6498,7042,8107,8364,8422
· All composite cylinders manufactured under one of the following
exemptions:
7235, 8023, 8115
· All Walter Kidde DOT 3AL scuba tanks
· All Cliff Impact DOT 3AL scuba tanks made before July 1990
· All Luxfer 80.8 cu. ft. scuba tanks (S80.8) made before May 1987
· All Luxfer 72 and 100 cu. ft. tanks (S72, S100) made before August 1987
· All Luxfer 80 cu. ft. scuba tanks (S80) made before January 1988
· All Luxfer 50 and 92 cu. ft. scuba (S50, S92) tanks made before April 1988
· All Luxfer 30 and 63 cu. ft. scuba tanks (S30, S63) made before May 1988
· All Luxfer 40 cu. ft. scuba tanks (S40) made before June 1988
· All other scuba tanks made in the US before February 1990 (except
Catalina)
· All Scuba tanks not made in the US.
·
UNLESS PROVEN OTHERWISE, ALL SCUBA TANKS ON THE ABOVE LIST SHOULD BE ASSUMED
AS BEING MADE USING THE 6351-T6 ALLOY
----- Original Message -----
From: <stuart.morrison@sw*.co*.uk*>
To: <techdiver@aquanaut.com>
Sent: Tuesday, April 18, 2000 7:00 AM
Subject: US AL80's
> Hi All,
>
> anyone on the other side of the pond give some pointers on decoding the
> markings on US supplied Luxfer AL cylinders, mid 90's vintage which I
> brought back to the motherland.
>
> I know what most of it means but what I am interested in is does it state
> the alloy grade on the bottle neck? There have been warnings from Luxfer
> UK to check the alloy grade on UK cylinders which is easy enough, but I
> haven't had any feedback on my US cylinders.
>
> If it isn't in the markings, any info on how to check the grade?
>
> What is safe and what isn't?
>
> They are all deco bottles so never got the same fill-empty-fill cycling
> that the rest of my stuff goes through, but they are all at least six
> years old, some are eight.
>
> Thanks in advance,
>
> S
>
>
> .
>
>
>
> Visit our web site at www.scott-wilson.com
>
> Privilege and Confidentiality Notice.
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> Thank you.
>
>
> Scott Wilson Scotland Ltd
> Registered in Scotland No. 48951,
> Registered Office: 6 Park Circus, Glasgow, G3 6AX. UK.
>
>
>
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