A pipe of length 400m is used to pump H2 from a vessel maintained at 25 barg to a second vessel at 20barg. The H2 is at 25C and its flow rate is 0.2kg/s. If isothermal conditions are assumed and the friction factor f can be assumed to be 0.005 what is the diameter of the pipe? Hint: Use E balance 2P1V1P22P12+G2(lnP2P1+di2fL)=0 Question 2 A 70m long, 3 schedule 40 horizontal commercial steel pipe of with an inlet gauge pressure of 172 kPa is used to transport air. The inlet velocity of the air is 60m/s and it is at 15C. At this pressure and temperature the viscosity is 0.0174cP and =1.40 (1cP=1103Pa.s) Assuming isothermal flow, calculate; a) The discharge pressure b) The maximum length of the pipe needed to maintain the inlet conditions Hint: a) Trial and error solution, First iteration assume P=130kPa b) Calculate u2=uw=PwVw and find the corresponding L c) E balance 2P1V1P22P12+G2(lnP2P1+di2fL)=0