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Question: two pressure gauges measure a pressure drop of 163 psi...

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Two pressure gauges measure a pressure drop of 16.3 psi (lb/in^2) at the entrance and exit of an old buried pipeline. The original drawings have been lost. If the 6in galvanized iron pipe carries water at 68°F with a flow rate of 1.64cfs (ft^3/s), determine the length of the horizontal underground line ignoring minor losses.
NOTE: The answer is 871ft. Please show how to solve for this.

Two pressure gauges measure a pressure drop of 16.3 psi (lb/in.2) at the entrance and exit of an old buried pipeline. The original drawings have been lost. If the 6-in. galvanized iron pipe carries water at 68°F with a flow rate of 1.64 cfs (ft3/s), determine the length of the horizontal underground line ignoring minor losses.
Relative roughness .
Pipe Material e (ft) 0.000005 e (mm) Brass Concrete 0.0015 Steel forms, smooth Good joints, average Rough, visible form marks 0.18 0.36 0.60 0.0015 0.0006 0.0012 0.002 0.000005 0.15 Copper Corrugated metal (CMP) Iron (common in older water lines, except ductile or DIP, which is widely used today) 45 Asphalt lined Cast Ductile; DIP-cement mortar lined Galvanized Wrought 0.12 0.26 0.12 0.15 0.045 0.0015 0.0015 0.0004 0.00085 0.0004 0.0005 0.00015 0.000005 0.000005 Polyvinyl chloride (PVC) Polyethylene, high density (HDPE) Steel Enamel coated Riveted Seamless Commercial 0.0048 0.9 ~9.0 0.004 0.045 0.000016 0.003-0.03 0.000013 0.00015
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