MANUFACTURE

Halyard GRP Silencers

Halyard produces GRP silencers using specialist resins, allowing our Halyard silencers to survive remarkably high temperatures if the cooling water supply blocks for short periods. Silencers are usually made from filament wound GRP tube, manufactured in our own plant, which is hand-laminated with flat sheet bases. Every single silencer produced is pressure tested individually to guard against leaks. Every silencer is gel-coated after completion and the production number on the label links into a Quality Assurance system which allows us to trace each operator involved in its production.

GRP is used as the base material to avoid the corrosion and acoustic problems of welded stainless units, and to avoid the low melting points of plastic silencers. Although normal marine exhausts run at between 40°C and 60°C, Halyard silencers will remain operational after exposure to 300°C or more, while a plastic unit will melt at around 150°C. More costly resins allow us to offer silencers for even higher temperatures for specific applications.

Halyard GRP silencers will be replaced free of charge if they prove faulty within five years.
Lloyds and many Classification Societies will readily accept Halyard silencers and formal Lloyds Approval can be arranged on specific installations. Customers should check for up-to-date information. Most major engine manufacturers recommend Halyard silencers and several list them as options.

GRP AS A SILENCER MATERIAL

We use GRP as the principal material in components used in the wet sections of our exhaust systems. Specialist resins allow us to build systems for the operating temperatures required, and GRP avoids the corrosion and noise problems of stainless steel.

Our products are made from GRP filament wound tube, wound on our own computer controlled machinery and then assembled by craftsmen with years of experience in the lamination of complex sub-assemblies which must fit precisely into complete systems.