Silencing and exhaust systems
11Pages

SILENCING AND EXHAUST SYSTEMS 165

HALYARD® SILENCING AND EXHAUST SYSTEMS – LLOYDS APPROVED A marine engine exhaust system ejects the cooling water as well as silencing the engine’s combustion noise and removing the exhaust gasses. The system must create minimal restriction to the flow of exhaust gasses, known as back pressure, or the engine may be damaged. 166 Halyard® produces GRP silencers using specialist resins, allowing Halyard® silencers to survive remarkably high temperatures if the cooling water supply blocks for short periods. Halyard® silencers are usually made from filament wound GRP tube, manufactured in our own...

HALYARD® - SILENCING AND EXHAUST SYSTEMS APPLICATIONS AND INSTALLATION DIAGRAMS WHERE’S THE WATERLINE? Marine exhausts are cooled by sea water, so it’s essential that the water cannot run back up the exhaust and into the engine’s cylinders. The resulting damage can be catastrophic. A few simple rules need to be followed, and engine installers should seek expert advice if in any doubt. 167 ENGINE WELL ABOVE WATERLINE This engine is sited well above the waterline, and the exhaust system has a downhill gradient of 1 in 8, or steeper, as it scope to the stern. The water will naturally run down...

HALYARD® LIFT SILENCERS - LLOYDS APPROVED UP TO 50% NOISE REDUCTION Halyard® Lift silencers are designed for use with engines positioned on, or below waterline. Halyard® Lift Silencers are as popular with generators as they are with propulsion engines. 168 SIDE IN, TOP OUT LIFT SILENCERS The side in, top out lift silencer is the best selling small lift silencer in the Halyard® range. Every unit is pressure tested and gel-coated for a durable and smart appearance. Available lengths: page 171 TOP IN, TOP OUT LIFT SILENCERS In many applications a top inlet unit will be easier to use. The noise...

HALYARD® DUAL CHAMBER SILENCERS - LLOYDS APPROVED UP TO 80% NOISE REDUCTION Halyard® Dual Chamber silencers is the best wet-exhaust silencer on the market today. Exhaust noise reductions of up to 80% can be achieved and the back pressure created by the unit is minimal. Most units are hand-built with inlet and outlet positioned to suit the particular craft. 169 The quality standards applied are designed to give a life in excess of ten years on a privately owned craft. Available lengths: see page 172 HALYARD® EXHAUST WATER SEPARATORS - LLOYDS APPROVED NOISE REDUCTION UP TO 90% Fitting a water...

HALYARD® SILENCERS AND EXHAUST WATER SEPARATORS - LLOYDS APPROVED LIFT SILENCERS (UP TO 40% NOISE REDUCTION) Drain Plug Drain Plug

NOISE INSULATION MATERIALS HALYARD® QUALITY Marine diesels create very high noise levels – often well over 100 decibels. Engines are always located close to the boat user, generally in engine spaces made from GRP, timber, or steel. Noise insulation changes all this. It adds a soft facing to hard bulkheads to absorb noise and stop it bouncing around and growing. It features a clever multi-layer construction to make a thin material more effective than simple insulations many times thicker. I The absorption layer A thick layer of fire zero rated foam which soaks up noise and stops it bouncing...

3/4 Ply Only 15 10 5 45 125 NOISE INSULATION MATERIALS 250 40 500 1000 Frequency Hz 2000 4000 3/4 Ply + 45mm Halyard Material 66383 T S3002 Maritex faced material 66384 V S3004 Sealglass faced material 66385 X S3003 Reinforced silver polyester faced material 35 Noise Loss dB Noise Loss dB 12 mm (1/2") Materials - All are supplied with 4 sheets 1000 x 600mm (39" x 24") per box: tot 2,4 m2 12 mm (1/2") Self-adhesive materials - All are supplied with 4 sheets 1000 x 600mm (39" x 24") per box: tot 2,4 m2 174 66386 Z S5002 S5004 40 25 35 20 3/4 Ply Only 3/4 Pl + 12mm Halyard Material 30 15 25 10...

PUREGEN REMOVING SOOT SYSTEM FROM GENERATOR EXHAUST Puregen removes soot from generator exhausts. Some soot emerges from the exhaust gas outlet as smoke – unsightly and smelly. Some soot is generally scrubbed from the exhaust gas by the exhaust system water separator, and washes out into the surrounding water. It floats, and in quiet waters forms a light blue sheen on the water surface. Anyone going for an early morning swim, after running a generator all night, can find this greasy soot deposited lightly on their bikini, swimming shorts, and skin. Superyacht skippers will move the yacht...