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2003 Course Process Equipment Design - II

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Total No. of Questions : 12] P1262 [Total No. of Pages :5 [3864] - 324 B.E. (Chemical) PROCESS EQUIPMENT DESIGN - II (Revised 2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Your answers will be valued as a whole. 5) Assume suitable data, if necessary. SECTION - I Q1) a) b) Write short notes on : i) Types of agitators and baffles with neat sketch. ii) Power requirements for agitation. [10] Calculate the diameter of a shaft for an agitation system. H.P. required for agitation is 3 HP and speed of rotation is 36 rpm. Impeller diameter is 65 cm. Torque (max) exerted is 18900 kg. m. While bending moment is 27700 kg-m. Calculate the minimum shaft diameter for shear stress and tensile stress. Permissible shear stress = 400 kg/cm2 Permissible tensile stress = 600 kg/m2 [8] OR Q2) a) A jacketed, agitator reactor consists of a vertical cylinder 1.5m diameter, with a hemispherical base and flat flanged top. The jacket is fitted to be cylindrical section only and extends to a height of 1m. The spacing between the jacket and vessel walls is 75mm. The jacket is fitted with a spiral baffle. The pitch between spirals is 200 mm. The jacket is used to cool the reactor contents. The coolant used is chilled water at 10 C; flow rate 32,500 kg/hr, exit temperature 20 C. Estimate heat transfer coefficient at the outside wall of the reactor and pressure drop through the jacket. P.T.O.

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