Compact Silencer System (CSS) is a patented method for designing the complete exhaust systems using multiple silencer elements distributed along the exhaust pipe. Designed for applications where little or no engine noise is an operational requirement, such as passenger ships and ferries, offshore and military vessels, the new system can also help ship owners reduce operating costs because it negates the need for adding more due to lower pressure drop in the system compared to using conventional silencers.
The CSS concept covers the whole frequency spectra whilst maintaining a low pressure drop – an advantage since the introduction of exhaust gas cleaning equipment, such as SCRs and scrubbers, are likely to further increase the exhaust gas back pressure if conventional engine noise reduction systems are used.
Where low weight, low centre of gravity and space is of concern, CSS components have been optimised to minimise the space requirement of the exhaust system. Pre-insulated silencer elements, for instance, are designed to have almost the same diameter as the insulated exhaust gas pipe.
Acoustic properties are optimised according to operational and regulatory noise level requirements, and although the final solution selection depends mainly on the demand for noise reduction demand, allowable piping length and ship compartments, the CSS offers a more slender, lighter cost-effective solution compared to single unit systems. It is easy-to-install, acoustically robust, reduces pressure drop and, importantly, noise.
See here the picture of differences between a conventional silencer system and the Compact Silencer System.
