Problem 3.1 - Problem 3.1 [Difficulty: 2] Given: Data on...

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Problem 3.1 [Difficulty: 2] Given: Data on nitrogen tank Find: Pressure of nitrogen; minimum required wall thickness Assumption: Ideal gas behavior Solution: Ideal gas equation of state: pV MR T = where, from Table A.6, for nitrogen R 55.16 ft lbf lbm R = Then the pressure of nitrogen is p T V = T 6 π D 3 = p 140 lbm 55.16 × ft lbf lbm R 77 460 + () × R 6 π 2.5 ft 3 × × ft 12 in 2 × = p 3520 lbf in 2 = σ c π Dt p D 2 /4 To determine wall thickness, consider a free body diagram for one hemisphere:
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