Mailing List Archive Mailing List Archive
>> >> Hi! >> >> Im not a diver myself, but I have a question someone might have an answare >> for. If you have a bottle with much higher pressure then the normal 200 bar, >> what is the cons and pros? Lets say 500-1000 bar. >> > Respose from dtt00@ut*.am*.co* (David T. Truslow) Well...you'd have problems with materials and with components. Examples: The Compressed Gas Association doesn't have a great deal of info about how materials behave under such pressures. Is the current 5 year hydro- static test suitable? How does heat affect such materials? What type of failure would be seen? What type of fittings and material (hoses, valves, etc.) will perform satisfactorly, etc. The other problem would be filling such tanks. The training, inspection procedures, and equipment maintenance for compressors will be quite different. The cost may be so prohibitive as to render it uneconomical for all but a few technical applications. Lastly, one would need to allow for overfills. Many shops can fill tanks to 3500 psi. However, when the tank cools, there can be a significant air loss. The effect is not nearly as severe as with a 2400 psi tank. Either fill times will be very long to allow for tank cooling or the tanks must be engineered to allow for hot fills. Hope this helps, Dave >Well...you'd have problems with materials and with components. The introduction of a "zero stage" could solve almost all problems except the problems related to the bottle. >Examples: The Compressed Gas Association doesn't have a great deal of info >about how materials behave under such pressures. Actual data is mostly sufficient. >Is the current 5 year hydro- >static test suitable? This is a problem, because current bottles is for short time use. >How does heat affect such materials? They dont like heat, but aluminium are also sensitive to high temperature. >What type of >failure would be seen? Depends on the matrial, but if a 300 bar steel bottle rupture I gess it will kill you. If the pressure is 1000 bar in a lighter bottle, that to will kill you but perhaps not youre dive buddies. >What type of fittings and material (hoses, valves, etc.) >will perform satisfactorly, etc. Can possibly be solved with a "zero-stage", but I gess what is needed is a new 1. sage. >The other problem would be filling such tanks. The training, inspection >procedures, and equipment maintenance for compressors will be quite different. Probably different but hey, you guys do *technical diving*! >The cost may be so prohibitive as to render it uneconomical for all but a few >technical applications. Dont know what it will cost. >Lastly, one would need to allow for overfills. No problem. >Many shops can fill tanks to >3500 psi. However, when the tank cools, there can be a significant air loss. >The effect is not nearly as severe as with a 2400 psi tank. Either fill times >will be very long to allow for tank cooling or the tanks must be engineered >to allow for hot fills. The problem is the air, not the bottle. If you can cool the air before it enters the bottle the bottle stays at a nice temp. Basicly it is not a problem. >Hope this helps, >Dave Great! Any moore out there? John
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]