Wow… really…
The answer to your question is yes, I have downloaded many of the Faber drawings from their web site. They are available to anyone that signs up in the site:
Scubadiving cylinders Faber leader in scuba diving cylinders Faber steel cylinders, diving, scuba, diving cylinders, diving cylinders, diving cylinders, scuba diving cylinders, sub SCUBA scuba DIVING
The drawings are divided under different codes (for different countries, including the US DOT and Transport Canada).
But more important is that you could have downloaded and read the CFR 49 and would have found out that many of your assumptions are incorrect. Material specifications are in the CFR.
The 2400 psi DOT cylinders are built and stamped under the 3AA code (as I mentioned above). In 49 CFR 178.37 you can see a table with the steel alloys authorized under the 3AA code. I am not familiar with three of those alloys, but substituting a higher strength alloy (like the ones used under special permits) is not an option.
The codes give the equations that can be used and the allowable stresses.
Faber makes many cylinders for many countries. You can download the drawings and take a look. You will see that they are different drawings for different codes.
About ten years ago the company I worked for manufactured high pressure cylinders for industrial gases. The cylinders I designed had to meet very strict codes because the service condition did not allow requalification every 5 years. The cylinders I worked on had to be designed with higher safety factors and allowances for degradation due to corrosion, etc. I am a Licensed Professional Engineer and I stamped the calculations and drawings for some of those cylinders.
Your assumptions about fabrication are also incorrect (Scared Silly is correct). I have not worked for one of the DOT cylinder manufacturer, but I have over two decades of experience in metal fabrication and pressure vessels.
DOT cylinders are designed to be light for transportation. They don’t even have allowance for material loss due to corrosion and that is one of the reasons they need regular requalification hydro testing and visual inspections. The assumption that they are over built is wrong. They are built with a safety factor to account for a number of conditions (this can be a lengthy subject).
All pressure vessels have to be designed with some safety factor. The pressure alone is not the only load that the cylinder has to survive. A DOT cylinder has to survive a reasonable vehicle accident (aircraft, over the road transportation, train, and marine).
At the end of the day I know you are going to believe whatever you like to believe. I realize that a government conspiracy is far more interesting than the boring facts.
So carry on.
The answer to your question is yes, I have downloaded many of the Faber drawings from their web site. They are available to anyone that signs up in the site:
Scubadiving cylinders Faber leader in scuba diving cylinders Faber steel cylinders, diving, scuba, diving cylinders, diving cylinders, diving cylinders, scuba diving cylinders, sub SCUBA scuba DIVING
The drawings are divided under different codes (for different countries, including the US DOT and Transport Canada).
But more important is that you could have downloaded and read the CFR 49 and would have found out that many of your assumptions are incorrect. Material specifications are in the CFR.
The 2400 psi DOT cylinders are built and stamped under the 3AA code (as I mentioned above). In 49 CFR 178.37 you can see a table with the steel alloys authorized under the 3AA code. I am not familiar with three of those alloys, but substituting a higher strength alloy (like the ones used under special permits) is not an option.
The codes give the equations that can be used and the allowable stresses.
Faber makes many cylinders for many countries. You can download the drawings and take a look. You will see that they are different drawings for different codes.
About ten years ago the company I worked for manufactured high pressure cylinders for industrial gases. The cylinders I designed had to meet very strict codes because the service condition did not allow requalification every 5 years. The cylinders I worked on had to be designed with higher safety factors and allowances for degradation due to corrosion, etc. I am a Licensed Professional Engineer and I stamped the calculations and drawings for some of those cylinders.
Your assumptions about fabrication are also incorrect (Scared Silly is correct). I have not worked for one of the DOT cylinder manufacturer, but I have over two decades of experience in metal fabrication and pressure vessels.
DOT cylinders are designed to be light for transportation. They don’t even have allowance for material loss due to corrosion and that is one of the reasons they need regular requalification hydro testing and visual inspections. The assumption that they are over built is wrong. They are built with a safety factor to account for a number of conditions (this can be a lengthy subject).
All pressure vessels have to be designed with some safety factor. The pressure alone is not the only load that the cylinder has to survive. A DOT cylinder has to survive a reasonable vehicle accident (aircraft, over the road transportation, train, and marine).
At the end of the day I know you are going to believe whatever you like to believe. I realize that a government conspiracy is far more interesting than the boring facts.
So carry on.
