A straight pipe ABCD is 15 m long, with three equal length sections. AB and CD...

 

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A straight pipe ABCD is 15 m long, with three equal length sections. AB and CD are of uniform diameter and the diameter of BC tapers uniformly from 150 mm at B to 100 mm at C. Oil of relative density 0.85 flows along the pipe at 30 L/s. The pressure at A is 12.5 kN/m² and the pressure at D is 8.3 kN/m². (i) If A is 1.0 m above an assumed datum calculate the elevation of D, ignoring pipe friction. (4 marks) (ii) Calculate the pressures at B and C in the pipe. (4 marks) (b) A pipeline AC is 7000 m long and 300 mm in diameter and the pipe-flow chart in Appendix B applies. The inflow at A is 140 L/s and there is a draw-off 20 L/s at B 3000 m from A. Calculate or otherwise derive the friction head loss from A to C. (3 marks) A straight pipe ABCD is 15 m long, with three equal length sections. AB and CD are of uniform diameter and the diameter of BC tapers uniformly from 150 mm at B to 100 mm at C. Oil of relative density 0.85 flows along the pipe at 30 L/s. The pressure at A is 12.5 kN/m² and the pressure at D is 8.3 kN/m². (i) If A is 1.0 m above an assumed datum calculate the elevation of D, ignoring pipe friction. (4 marks) (ii) Calculate the pressures at B and C in the pipe. (4 marks) (b) A pipeline AC is 7000 m long and 300 mm in diameter and the pipe-flow chart in Appendix B applies. The inflow at A is 140 L/s and there is a draw-off 20 L/s at B 3000 m from A. Calculate or otherwise derive the friction head loss from A to C. (3 marks)

Answer rating: 100% (QA)

SOLUTION i To ignore pipe friction we can use Bernoullis equation between points A and D PAg zA VA22g PDg zD VD22g where P is pressure is the density ... View the full answer