Limiting noise and
vibration at the build stage is far more effective and efficient, and there are
plenty of modern solutions available on the market. Consulting a professional
at the design stage will enable the boat builder to optimise the noise and
vibration reduction for the most effective solution within budget.
Andrew Davies, Sales &
Marketing Director at Halyard (M&I), told Maritime Journal, “Whether wet or dry, an exhaust system should be
emitting minimum noise while still working at optimum performance. The type of
silencer needed depends on the type of exhaust system, how large it is and if it’s
above or below the waterline. Most commercial vessels have previously opted for
dry exhaust systems, but these have a tendency to be heavier and hotter than a
wet system. This is where a water injected systems with a wet silencer can be
hugely beneficial, and more cost-effective than a dry system.”
Other options include
silencer/separators and dual chamber silencers, which can offer over 70% noise
reduction. Andrew added: “On the vibration reduction side, systems are available
now which aid the installation of the engine in a horizontal position,
resulting in permanent, guaranteed alignment. Using a system that comprises
softer engine mounts, a CV shaft and thrust bearings, can immediately reduce
vibration levels. As the permanent alignment improves the driveline and reduces
the vibration caused by stiff mounts, vibration can be reduced by up to 90%.
Although the engine mounts are soft, there is still enough freedom of movement
so as to not hamper the boat’s performance. These systems work by transmitting
the thrust to the hull instead of the engine, reducing wear and tear
As the welfare of crews
and passengers on board vessels becomes an increasingly high profile issue, boat
builders need to do all they can to reduce noise and vibration levels at build
stage, to provide a safe and healthy working environment for crews.
Halyard has been supplying
equipment for commercial craft for over thirty years and today is a key
supplier for yards across the globe. Be it a wind farm support vessel, a
lifeboat, a passenger ferry, a pilot boat or a landing craft or patrol vessel
for the military.