Natural gas rho 00044 slugsft3 and v 52 times 10-5 ft2 s

Question

Natural gas (ρ = 0.0044 slugs/ft³ and v = 5.2 × 10-5 ft² /s) is pumped through a horizontal 6-in.-diameter cast-iron pipe at a rate of 800 lb/hr. If the pressure at section

(1) is 50 psi (abs), determine the pressure at section

(2) 8 mi downstream if the flow is assumed incompressible. Is the incompressible assumption reasonable? Explain.