5.3.2 Evaporators and Distillers.docx - Table of Contents Ref No Contents 5.3 2 Evaporators and Distillers 5.3.2.1 5.3.2.2 5.3.2.3 5.3.2.4 5.3.2.5

5.3.2 Evaporators and Distillers.docx - Table of Contents...

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Table of Contents Ref No. Contents Page No 5.3. 2 Evaporators and Distillers 1 5.3.2.1 Explains why 'fresh water' may have to be produced from seawater 1 5.3.2.2 Lists the purposes for which the water might be used 1 5.3.2.3 Explains the effect that distillation has on the dissolved solids in seawater 1 5.3.2.4 States that evaporators and distillers are pressure vessels and as such must conform to approved standards for materials, fittings and construction 2 5.3.2.5 States that there are two main methods of obtaining vapour from seawater 2 5.3.2.6 By direct boiling, using boiling water evaporators 2 5.3.2.7 By the evolution of vapour when the seawater is 'supersaturated', using flash evaporators 3 5.3.2.8 Describes in simple terms, using line sketches, the construction of a shell and coil evaporator, naming the materials of the principal parts Working principle of typical fresh water generator 3 5.3.2.8. 1 Fresh water generator starting procedure 4 5.3.2.8. 2 Regulating the capacity of fresh water Generator 5 5.3.2.8. 3 Fresh water generator stopping procedure 6 5.3.2.8. 4 Precautions for Operation of fresh water Generator 6 5.3.2.9 Lists the mountings fitted to a simple shell and coil evaporator Demister Condenser Salinometer Eductors 7 5.3.2.10 Explains why a reducing orifice is fitted in the steam supply line of such an evaporator 7 1 st Issue Date: 2014.08.11 Revision No. 04 Revision Date:2016.04.11 Authority : CEO
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5.3.2.11 States that the heat transfer can be obtained from: A supply of steam or other hot fluid passing through coils Tubes which are immersed in the seawater or An electrical element immersed in the seawater 7 5.3.2.12 Explains why low-pressure evaporators are used 7 5.3.2.13 Explains what is meant by single-effect and by double-effect evaporation 8 5.3. 3 Flash Evaporators 9 5.3.3.1 Explains the principle of flash evaporation 9 5.3.3.2 States that flash evaporators can use a number of stages, with seawater feed passing through each stage in succession 10 5.3.3.2. 1 Single flash type evaporator 11 5.3.3.3 Describes, with the aid of a simple sketch, a two-stage flash evaporator 12 5.3.3.4 Explains the principle of operation of the evaporator in the above objective 12 5.3. 4 Multiple-effect Evaporation 13 5.3.4.1 States that shell and coil evaporators can be connected in series, with the vapour produced in the first unit being used as the heating fluid in the next unit, the seawater passing through each unit in turn 13 5.3.4.2 States that production of vapour in the second and successive units occurs partly by boiling and partly by flash evaporation 13 5.3.4.3 States that such a system is termed 'multiple effect' 13 5.3.4.4 States that multiple-effect evaporation produces an increased quantity of fresh water compared to a single evaporator using a similar input of heat 13 5.3.4.5 Describes, with the aid of a single line sketch, the arrangement of a two-stage flash-evaporation plant 14 5.3. Control of Water Density and Scale 15 1 st Issue Date: 2014.08.11 Revision No. 04 Revision Date:2016.04.11 Authority : CEO
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5 5.3.5.1 Explains how the formation of scale on the
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