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You wrote: > >Dear All, > >Do any of you know how to calculate how many cubic feet has a cilinder >of X litters. I tried to find out the exchange constant but i didn't. > >for example: How many cubic feet has a cilinder of 18 Liters ? > >Is the work pressure important to make this calculation or the only >informations i have to know are the ammount of litters or Cubic Feet >(capacity) of the cilinder to convert and the exchange constant ? > Carlos, In the US thank capacities are expressed as volume @ 1 ATA (V@1A*) in ft^3. In Europe in general they R expressed as internal vol (Vint) & a working pressure (Pwork) is reported. A coefficient is not easy to come by. Easiest method is V@1A*= Vint*Pwork Assuming a Pwork of 300 bars, an 18 l tank will hold @ 1 ATA V@1A* = 18*300 = 5400 liters 5400 l = 5400/28.3 = 190.8 ft^3, more than twice air contained in a STD AL80 The conversion of liters to ft^3 is 28.3 l = 1 cu.ft if using 1" = 2.54 cm The reverse calculation basically compresses the gas, say 80 ft^3, to the vol it will occupy @ the Pwork, say 3000 psi (gauge, add 14.7 to conv to abs), and calculates the volume it will occupy @ that P, the Vint of the tank. Vint = V@1A**P1ATA/Pabswork Vint = 80*14.7/3014.7 = 0.39 ft^3 In liters 28.3*0.39 = 11.04 l, or an 11 l (eleven liter not elel el) tank. Esat Atikkan -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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