A tanker carrying toluene is unloaded, using the ships pumps, to an on-shore storage tank. The pipeline

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A tanker carrying toluene is unloaded, using the ship’s pumps, to an on-shore storage tank. The pipeline is 225 mm internal diameter and 900 m long. Miscellaneous losses due to fittings, valves, etc., amount to 600 equivalent pipe diameters. The maximum liquid level in the storage tank is 30 m above the lowest level in the ship’s tanks. The ship’s tanks are nitrogen blanketed and maintained at a pressure of 1.05 bar. The storage tank has a floating roof, which exerts a pressure of 1.1 bar on the liquid. 

The ship must unload 1000 metric tons within 5 hours to avoid demurrage charges. Estimate the power required by the pump. Take the pump efficiency as 70 per cent. 

Physical properties of toluene: density 874 kg/m3 , viscosity 0.62 mNm-2 s.

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Chemical Engineering Design

ISBN: 9780081025994

6th Edition

Authors: Ray Sinnott, R.K. Sinnott, Sinnott Gavin Towler

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