N/A Inside a Chinese Carbon Fiber Bottle (is this normal?)
- Thread starter hgg2k
- Start date
From scubaengineer.com:
https://www.scubaengineer.com/pictures/scba_cylinders/luxcompinspectmanual.pdf
"5.4 Internal Inspection
a) Reject all cylinders with internal isolated corrosion pit(s) estimated to be more than 0.03 inches
(0.76 mm) deep.
b) Reject all cylinders with sidewall line or broad-spread corrosion when one or more interior
pit(s) in the line corrosion is deeper than 0.020 inches (0.51 mm), and/or if the interior broad-
spread corrosion is deeper than 0.020 inches (0.51 mm).
c) Reject all cylinders that have bulges or dents on the inside of the liner. This indicates severe
impact or another form of serious damage."
The thread depth is around 0.7mm and the roughness of the inner surface is nowhere
near a) and b). Passes (c) as well.
So, I guess some roughness is allowed even when corroded in someway.
Now I am very curious to see the inside of an FX bottle.
If we do not have any photos, everything else is speculation.
https://www.scubaengineer.com/pictures/scba_cylinders/luxcompinspectmanual.pdf
"5.4 Internal Inspection
a) Reject all cylinders with internal isolated corrosion pit(s) estimated to be more than 0.03 inches
(0.76 mm) deep.
b) Reject all cylinders with sidewall line or broad-spread corrosion when one or more interior
pit(s) in the line corrosion is deeper than 0.020 inches (0.51 mm), and/or if the interior broad-
spread corrosion is deeper than 0.020 inches (0.51 mm).
c) Reject all cylinders that have bulges or dents on the inside of the liner. This indicates severe
impact or another form of serious damage."
The thread depth is around 0.7mm and the roughness of the inner surface is nowhere
near a) and b). Passes (c) as well.
So, I guess some roughness is allowed even when corroded in someway.
Now I am very curious to see the inside of an FX bottle.
If we do not have any photos, everything else is speculation.
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Do you mean I should try for a refund?
But we are not 100% sure that this is an issue, since no one yet has
come with a photo of a different approved carbon fiber bottle.
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If you buy it direct from China, then you’re importing a pressure vessel and those are regulated because pressure vessels can harm others too.In other words, You Pays Your Money And You Takes Your Chances.
In the EU I believe these are regulated as PED Category 3 vessels.
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The seller just replied when I asked about the internal surface:
- "This is a bottle of carbon braze wound. This bottle is the best product in our country"
- "This is a bottle of carbon braze wound. This bottle is the best product in our country"
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You tell me! lol
I hope he is not implying that the liner is brazed and not a singled piece
of aluminum pressed into shape... I cannot see any seams inside though.
I hope he is not implying that the liner is brazed and not a singled piece
of aluminum pressed into shape... I cannot see any seams inside though.
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Those specs are for aluminum and steel scuba tanks. You might want to check if those same specs apply to SCBA’s. The liners in SCBA’s are very very thin compared to a aluminum scuba tank.
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I don’t know what customs thinks. I do believe it could be illegal to have a high pressure tank in the EU that doesn’t have PED certification.
And then there is the common sense factor - if it’s never been tested then do you want to fill it with air and hope it holds? Hope it doesn’t burst in a hot car? Hope it doesn’t burst when you clamp a bipod to it? I’m not rich but I can afford a hydro tested tank.
In the US it can be illegal per the applicable DOT regulations, which is a whole other subject.
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Can you take a picture/s of any labelling on the cylinder so we can see. In the AliExpress link they show a bunch of Chinese that i think I’ve seen tattooed on chicks backs and legs.
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Are you sure? See photo screen shot from your link, page 21, section 6C. It says .030” for SCBA, .060 for aluminum scuba tank. I highly doubt you have any pits. But longitudinal scratches 6” long are condemning.
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Yeah, nothing on the label compared to quality made SCBA’s (not to say yours is junk).
And not aware what Q/JB TH0015 means but a quick google search shows that it references the REE number.
See link, bottom of page on link.
Read one time that a 4500 psi 45 minute SCBA can raise a fire truck ten stories. So if your much smaller SCBA lets loose it might only raise your car five or ten feet.
And not aware what Q/JB TH0015 means but a quick google search shows that it references the REE number.
See link, bottom of page on link.
Read one time that a 4500 psi 45 minute SCBA can raise a fire truck ten stories. So if your much smaller SCBA lets loose it might only raise your car five or ten feet.
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A 45 min scba is 66 cuft of air at 4500psi. That's a cube 4 ft x 4ft x 4ft at 14.7 psi or sea level air pressure
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