Marine Exhaust System; Hidden but Essential - Vetus

VETUS marine exhaust systems are based on &#;wet&#; systems. This is the process in which the cooling water is injected into the exhaust line.  This reduces the gas temperature along with reducing fumes.

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With the engine being at the heart of any vessel, it is important to fit the correct engine exhaust system. This will reduce maintenance costs, increase performance and is also safer for the crew.

The system is often hidden but plays a vital role in making sure the crew are not exposed to toxic exhaust gases by transporting these safely away. It also transports raw water or sea water and protects the engine against water ingress.

The main components of the exhaust system are the mixing elbow, the waterlock and the gooseneck. Additional components are an exhaust alarm and an air vent. There are also lesser-known options such as a gas water separator for a very quiet installation.

It starts with the intake grate/inlet valve

The first part of a well-designed wet marine exhaust system is the intake grate which only allows the engine cooling water to be sucked in when the engine is running and will filter the water to make sure items like plastic bags are not sucked up.

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The mixing elbow is where hot exhaust gases of up to 400 degrees Celsius are mixed with cold cooling water with temperatures dropping to around 40 or 50 degrees Celsius.

A flexible hose supplies cooling water to the impeller pump which moves the water through the heat exchanger where it is then forced into the mixing elbow. When installing the system, the hose should be kept as straight down as possible from the mixing elbow to the water lock to ensure a good mix of cold water and hot gases, if this is not possible, a swirler or mixer can be fitted.

The marine exhaust hoses I have seen are much thicker and reinforced, than the radiator hoses I have used on my car.

There is an ABYC standard that no contact point in a boat engine space is to exceed 200º F. Why you see exhaust manifolds insulated.

You may find the hose you seek at a non marine store like Granger.

I used this article from Steve D'Antonio to expand my knowledge base on exhaust systems. It might help.

Exhaust system design - Ocean Navigator

There are two approaches to marine exhaust setups.

I understand it is a matter of the heat that the hoses are designed to withstand. Temps in an engine exhaust can reach º F.The marine exhaust hoses I have seen are much thicker and reinforced, than the radiator hoses I have used on my car.There is an ABYC standard that no contact point in a boat engine space is to exceed 200º F. Why you see exhaust manifolds insulated.You may find the hose you seek at a non marine store like Granger.I used this article from Steve D'Antonio to expand my knowledge base on exhaust systems. It might help.