Luxfer 19 pony

[OldNSalty]

Were these ever made from the 6351 allow? I couldn't find them listed and I wanted to know if they were generally safe.

Thanks

 

[Hallmac]

Not to my knowledge, however, as far as I have been told, all cylinders manufactured from the 6351 alloy by Luxfer USA were done so under special permit/exemption 6498.

If your DOT/ICC is followed by SP6498 or E6498 it is the 6351 alloy, if it is followed by 3AL it is the "Good Stuff"

 

[Scared Silly]

Not on the list ...

Notice No. 94-7; Safety Advisory; High Pressure Aluminum Seamless and Aluminum Composite Hoop-Wrapped Cylinders

 

[rjack321]

If your DOT/ICC is followed by SP6498 or E6498 it is the 6351 alloy, if it is followed by 3AL it is the "Good Stuff"

incorrect assumption

 

[Scared Silly]

If your DOT/ICC is followed by SP6498 or E6498 it is the 6351 alloy, if it is followed by 3AL it is the "Good Stuff"

Legally the E6498 and SP6498 can and should be marked with 3AL at the time of requal (aka hydro). This happened starting in 1982. So the above a noted is not a good rule of cylinder.

What shops typically use is a date. Specially 1990 because "All Walter Kidde DOT-3AL cylinders, of which production ceased in January 1990, are made of alloy 6351-T6. Cliff Impact DOT-3AL cylinders were made from alloy 6351-T6 before July 1990"

But any Catalina cylinder is good as they always used 6061. Any Luxfer cylinder made from 1989 and after was made from 6061. Any Luxfer cylinder made in 1988 and before is more than likely made from 6351.

 

[Hallmac]

incorrect assumption

is there a Production of Luxfer cylinders made of 6351 alloy that was not marked as such?

 

[Hallmac]

Legally the E6498 exemption can and should be over marked with 3AL at the time of requal (aka hydro). This happened starting in 1983. The SP did not need to be over marked as special permits do not expire - only exemptions expire. So the above a noted is not a good rule of cylinder.

All 6498 cylinders are of the 6351 alloy, the 3Al marking was applied above the E and did not cover, or disturb the original stamping, None of the 6061 cylinders were manufactured under the 6498 Exemption or special permit. So what is wrong with the statement?

If there is a production of "Luxfer" cylinders that used the 6351 alloy and was factory marked 3AL I can understand the incorrect assumption or not a good rule correction, otherwise, while it may not be all-encompassing for every cylinder manufactured with the alloy, it does cover the Luxfer cylinders.

 

[Scared Silly]

If there is a production of "Luxfer" cylinders that used the 6351 alloy and was factory marked 3AL I can understand the incorrect assumption or not a good rule correction, otherwise, while it may not be all-encompassing for every cylinder manufactured with the alloy, it does cover the Luxfer cylinders.

3AL was first used in ~1982 as such from then until 1990 many many cylinders were made from the 6351 alloy and marked solely with 3AL. As such, the 3AL means nothing when it comes to the alloy other than aluminum.

PS - I have one in my basement that was made by Walter Kidde in 1988. Only has a 3AL mark on it.