5.3 Heat Exchangers.docx - Table of Contents Ref No Contents 5.3 5.3 1 Heat Exchangers Marine Heat Exchangers 1

5.3 Heat Exchangers.docx - Table of Contents Ref No...

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Table of Contents Ref No. Contents Page No. 5.3 Heat Exchangers 1 5.3. 1 Marine Heat Exchangers 1 States that marine heat exchangers are normally of the surface heat-transfer type and that seawater is used for cooling and condensing steam for heating 1 Describes surface heat transfer, referring to the relative direction of flow of fluid 2 Defines 'contact heat transfer' as the heat flow between fluids initially at different temperatures when they are mixed together 5 Sketches the principle of construction of the following surface heat-exchangers: 6 1 Shell and tube 6 2 Flat-plate type 8 2.1 how to clean a plate type heat exchangers 11 2.2 how to replace a seal 12 Single pass and multi pass 13 Lists the types of heat exchangers used for the following Lubricating oil coolers Fuel oil heaters Fresh water coolers Compressed air coolers Fresh water heater Steam condenser Sea water heater Evaporators and condenser In refrigerators 14 Heat exchanger materials 14 Arrangements for linear expansion of tube stack. 15 Arrangement of sealing 17 How leaks are detected 18 1 st Issue Date: 2014.08.11 Revision No. 04 Revision Date: 2016.04.11 Authority : CEO
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Subscribe to view the full document. Leak test methods 19 Temporary repairs 20 Temperature control and central cooling 22 Describes the effect of partially closing the cooling-water inlet valve 24 Explains the effect of entrained air in cooling water and how it is removed 24 Procedure for cleaning tubes of heat exchanger 24 Corrosion types and preventive measures 26 .1 Corrosion in Heat Exchanger 26 .2 Prevention of Galvanic Corrosion 28 1 st Issue Date: 2014.08.11 Revision No. 04 Revision Date: 2016.04.11 Authority : CEO
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5.3 Heat Exchangers Heat exchanger is equipment which reduces the temperature of a medium by transferring temperature of that medium to another, when both the mediums are separated by a solid membrane or wall like structure. For efficient operation, the surface area of the wall which separates the two mediums is maximized, simultaneously minimizing the flow resistance of the fluid. The heat from a fluid can therefore be transferred to another colder fluid by means of: a. Separately circulating them in adjacent spaces - heat flowing from a “hot” fluid through a tube wall or other membrane to another cooler fluid. b. Mixing them together - heat flowing from a hot fluid to a cooler fluid due to mixing of one with the other. 5.3.1 Marine Heat Exchangers Heat exchangers on board ship are mainly coolers where a hot liquid is cooled by sea water. There are some instances where liquid heating is required, such as heavy fuel oil heaters and sea water heaters for tank cleaning. Although being heat exchangers, the main condenser for a steam ship and the evaporator/distiller are dealt with separately.
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  • Fall '19
  • akeai lavaki

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