4. Natural gas (methane) YCH4~ 0.045 lb/ft3 at standard temperature and pressure

Question

4. Natural gas (methane) YCH4~ 0.045 lb/ft3 at standard temperature and pressure (STP- atmospheric). a. The gas is pushed through a 24" dia ipe at 20 fps, average 100 psia. Find the flow rate in SCF (standard cubic feet) per day, using appropriate conversions. Also, find weight moved daily (G, lb/day. b. Gas flow frictional head loss Aht~ Ahpis expressed as A psig Apsia). At the start, gas is compressed to 200 psig. oal in the steel pipe and bolts is 15,000 psi. Find required wall thickness (hoop stress).

Explanation / Answer

Q = SG * AREA * VELOCITY

Q= 0.045 * pi * 24^2 * 20*12

Q= 11.30973355 lb/s

Va = 0.18116 cubic feet/sec

Vs= Va × Fp × Tm × (Fpv)2

here Fpv is special compressibility factor

va = actual volume = 0.18116 cubic feet per second

Standard cubic feet = 0.212374933 ft^3 / sec

per day = standard cubic feet * 24*60*60 = 18349.19421 cubic feet

weight moved daily = Q* 24*60*60 = 977160.9787 lb

Hoop stress = pressure/ 2*d

d = 37.5 in Answer

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