Intro to Marine Engineering 2 2011 Part 1 pptx

[...]... pressure tank 22 LO cooler 12 Main turbines 24 LO bypass filter and pumps 13 Main gearbox 14 Thrust block 26 LO pumps 15 Main SW circ pump 28 Fire pump 29 Auxiliary boiler 30 Auxiliary boiler feed heater 31 HFO transfer pump module 32 HFO service pumps 33 Diesel oil transfer pump 34 Diesel alternator 35 Diesel alternator controls 40 Condensate de-oiler 41 Refrigerant circulation pump 42 Oily bilge pump... machinery fa) Part plan atfioorplate level In SECTION AT FRAME IOI LOOKING AFT LL" jL SECTION AT FRAME IOI LOOKING FORWARD Figure 1. 4 Steam turbine machinery arrangement 1 Main boiler 16 Main condenser 2 FD fan 17 Main extraction pump 3 Main feed pump 18 Bilge/ballast pump 4 Turbo-alternator 19 Drains tank extraction pumps 7 SW-cooled evaporator 10 Hot water calorifier 21 Turbo alternator pump 11 FW pressure... the piston rises (Figure 2. 1( b)) Fuel is injected as the piston reaches top dead centre and combustion takes place, producing very high pressure in the gases (Figure 2 l(c)) The piston is now forced down by these gases and at bottom dead centre the exhaust valve opens The final stroke is the exhausting of the burnt gases as the piston rises to top dead centre to complete the cycle (Figure 2. 1( d)) The... many are still in operation  12 Diesel engines Fuel injection ends Fuel injection begins Exhaust ports close Exhaust ports open Figure 2. 4 Two-stroke timing diagram " i- Upper /piston T_ f J ' Fuel ^injector k \Lower piston , I r Injection (a) t ^ ,t I 1 n Exhaust (b) Figure 2. 5 Opposed piston engine cycle r h-Exhaust port •-Scavenge port 1 _ Scavenging (c) ITO i— r • 1 4 r 1 f _r -L-t J-4 Compressioi... Calibrated spring Drum Linkage to provide straight line movement of stylus Piston Cylinder Indicator piston Section showing indicator piston ^vindicator cord —I Coupling *—' nut to fasten onto indicator cock Figure 2. 8 Engine indicator calibrated spring A magnifying linkage transfers the piston movement to a drum on which is mounted a piece of paper or card The drum oscillates (moves backwards and forwards)... strokes of the piston, or two revolutions of the crankshaft In order to operate this cycle the engine requires a mechanism to open and close the inlet and exhaust valves Consider the piston at the top of its stroke, a position known as top dead centre (TDC) The inlet valve opens and fresh air is drawn in as the piston moves down (Figure 2. 1 (a)) At the bottom of the stroke, i.e bottom dead centre (BDC),... Figure 2. 4 The opposed piston cycle of operations is a special case of the two-stroke cycle Beginning at the moment of fuel injection, both pistons Diesel engines 11 Fuel injector Cylinder Piston Exhaust port _ Scavenge port Connecting rodi Crank Exhaust (b) Rotation Compression (d) Figure 2. 3 Two-stroke cycle are forced apart—one up, one down—by the expanding gases (Figure 2. 5{a)) The upper piston opens... port (Figure 2. 3(b)) The burnt gases then begin to exhaust and the piston continues down until it opens the inlet or scavenge port (Figure 2. 3(c)) Pressurised air then enters and drives out the remaining exhaust gas The piston, on its return stroke, closes the inlet and exhaust ports The air is then compressed as the piston moves to the top of its stroke to complete the cycle (Figure 2. 3(d)) A timing... indicator The shaft power is the power available at the output shaft of the engine and can be measured using a torsionmeter or with a brake The engine indicator An engine indicator is shown in Figure 2. 8 It is made up of a small piston of known size which operates in a cylinder against a specially 16 Diesel engines Piston rod Calibrated spring Drum Linkage to provide straight line movement of stylus Piston... used to clean out or scavenge the exhaust 10 Diesel engines Figure 2. 2 Four-stroke timing diagram gases and then to fill or charge the space with fresh air Instead of val*"js holes, known as 'ports', are used which are opened and closed by the sides of the piston as it moves Consider the piston at the top of its stroke where fuel injection and combustion have just taken place (Figure 2. 3(a)) The piston . and propellers 20 0 12 Steering gear 21 1 13 Fire fighting and safety 23 1 14 Electrical equipment 25 3 15 Instrumentation and control 27 9 16 Engineering materials 326 17 Watchkeeping . Oxford 0X2 80F 20 0 Wheeler Road, Burlington, MA 018 03 First published 19 83 Reprinted 19 85 Second edition 19 90 Reprinted 19 92, 19 93 ,19 94 Revised 19 % Reprinted 19 98 (twice), 19 99 ,20 00 . Taylor. - 2nd ed. p. cm. ISBN 07506 25 30 9 1. Marine engineering 2. Marine machinery. I. Title VM600.T38S 19 90 623 ,87 dc20 89 71 326 ISBN 0 7506 25 30 9 For information on all