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Helium Pressurization and Cylinders
Required for a given He Concentration












This worksheet will dertermine the Helium differential pressure
increase needed to give the required concentration and the number of
cylinders required. Boxes in green are user required inputs, yellow boxes are the calculated
results.




























Select Volume units:
















Volume of
container:


















% He
concentration



% He















Required test
pressure:



psig















Select type of
cylinder to use:




approx cu ft air


liters


Empty Wt lbs










Cylinder fill
pressure:



psig















Volume of tracer
required:



cubic feet















He cylinder capacity:



approx He cu ft


This decrease is due to Helium compressibility effects











Pressurize with He to:



Differential pressure He addition (psid)






































































































US gallons



vol cu ft















cubic feet






Brad's calc on bottles for 300 (neglects to subtract last atm of He in
bottle))




liters


compressibility factor He @ 2000
psig




Brad's calc for 100 (same issue)




cu ft

300 psig

Apx wt lbs


cubic meters


vol for he






R

20

11


T

300

291

139





cylinder vol






RR

40

24


K

200

219

117











Q

80

46


S

150

139

61





300 psig decrease






LD

122

58


M, LD

125

110

58





vol left 300






S

150

61


Q

80

81

46





no bottles






K

244

113


60

60

58

29











T

330

139


RR

40

40

24





100 psig decrease










R

20

20

11





vol left 300


















no bottles














