SILL-CAB EXIT 3672888 - Caterpillar

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Typical example of a dry exhaust system for the naturally aspirated 3034 Marine engine (1) Insulating blanket (2) Stainless steel bellows
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Typical example of a dry exhaust system for the turbocharged 3034 Marine engine (1) Insulating blanket (2) Stainless steel bellowsA dry exhaust system for a marine installation needs to be designed carefully. Enclosing exhaust components that are high temperature in an enclosed space should be minimized.The dry exhaust system should include a flexible connection. An exhaust bellows joint that is made of stainless steel is suitable for a flexible connection. A flexible connection is required to accommodate movements that do not involve twisting. There should be no load on the exhaust bellows joint. The weight of the exhaust system should be supported by brackets. The exhaust bellows joint will absorb the expansion and the movement of the engine. Insulate the rest of the exhaust system.A condensate drain may be necessary if there is a long run of exhaust piping. Drain outside of the vessel.The diameter of the exhaust piping for a dry exhaust system depends on the engine arrangement. Naturally aspirated engines require a 40.0 mm (1.60 inch) bore. Turbocharged engines require a 63.5 mm (2.50 inch) bore.Part Wet, Part Dry Exhaust System
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Typical arrangement (1) Flexible hanger (2) Water injection elbow (3) 90 degree elbow (4) Riser (5) Stainless steel bellows (6) 90 degree elbowIf the engine is mounted well below the level of the sea water (3), then the advantages of a wet exhaust system can still be gained. However, the water injection must take place at a point sufficiently above the level of the sea water.Refer to Illustration 7 for a typical arrangement of a part wet, part dry exhaust system. The modular exhaust components allow different arrangements. The part wet, part dry exhaust system can be used on turbocharged engines and on naturally aspirated engines.The point of water injection should be at least 200 mm (8.00 inch) above the water line. The wet exhaust should have an average fall of at least 5 degrees.The minimum diameter for the dry part of the system should be 40 mm (1.6 inch) for the naturally aspirated engine. The minimum diameter for the dry part of the system should be 63.5 mm (2.5 inch) for the turbocharged engine.The minimum diameter for the wet part of the system should be 63.5 mm (2.50 inch) for the naturally aspirated engine. The minimum diameter for the wet part of the system should be 76 mm (3 inch) for the turbocharged engine.Note: The bellows should not be restrained. This will allow full movement of the bellows. The weight of the exhaust system should be supported by the flexible hangers and brackets.Water Lift Exhaust System
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Typical arrangement (1) The top of the exhaust riser must be above the level of the sea water. The connection for the siphon break to the exhaust pipe must be above the level of the sea water. The minimum distance is 450 mm (17.72 inch). (2)