Acoustics engineering has a wide range of applications in our society, be it in our household in the form of acoustic doors, windows or be it in the field of research centers in for noise control. One similar application of acoustics is in the field of navy where marines are kept silent from producing huge noises and one more application of acoustics is also present mining noise control.
In order to cool the exhaust of submarine, cooling water is injected into the exhaust pipe which cools the exhaust and reduces engine noise. The water is subsequently pushed out the exhaust pipe by the exhaust. Marine mufflers, which are generally made of non-metallic materials, are used on powerboats to reduce engine noise and cool the exhaust.
Marine mufflers, which are generally made of non-metallic materials, are used on powerboats to reduce engine noise and cool the exhaust. Mufflers are typically located above the waterline, and check valves are normally installed in-line to prevent backwards water flow, which could damage the engine.
Basic Introduction of Marine Exhaust System
I became deeply immersed in the mechanics of boats in the 1970s, and they quickly became my obsession. I’ve had the good fortune of accumulating over 25 years of experience and tens of thousands of engine operational hours (300+ diesel engine installs) and learning (often the hard way) what it takes to build a reliable engine / power train system and everything that goes with it. A large element of this is the Marine Exhaust System.The information in this article is intended to shed new light on one of the most critical aspects of a good boating experience.
One of the most important goals here is to dispel some of the mystique around many of the flawed and ill-conceived “couch engineering” designs that have long been ingrained in the boating industry. The first step in designing a safe and reliable exhaust system is to use common sense. “GRAVITY” is the crucial word here. Simply considering the general placement of your exhaust system, combined with the knowledge I hope you get from this post, should help you avoid a slew of nightmare scenarios down the line. Also keep in mind (this is something you can take to the bank) that completing it correctly the first time will keep your wallet in far better shape in the years to come.
The two most fundamental issues that must be comprehended and resolved are:
- It must be a safe system for the boat and the people on board, as well as the engine. It must also be long-lasting and meet the manufacturer’s criteria for back pressure and water entry.
- Even if something goes wrong, the exhaust design and/or system must suit the boat and perform in such a way that water never floods the engine, and the system must look “politically correct.”
Much of our work today still entails replacing, rebuilding, or repairing engines purely as a result of a poorly designed and/or built wet exhaust system that let salt water into the engine’s internal workings. The most fundamental of all natural factors in our life, “GRAVITY,” appears to have been “left out” of the design process, and when you combine that with couch engineering and “back yard designers,” you have a prescription for disaster down the road, sometimes very soon after you acquire a new boat.
Size of the Exhaust
Exhaust sizes (not overall design, as we must first determine what is required to meet engine specifications), dissect them a little, and then decide what is required and what will work. You should also be aware that when we talk about “marine exhaust,” we normally mean a “wet” system, but that there are two distinct elements within this “wet” system. There are TWO separate sections of the exhaust system/piping in most exhaust systems found in the type of boats discussed in these forums (150-800 HP diesel engines). One of the parts is dry and the part is wet. These two portions are present even on the factory-supplied 90 degree “wet elbow,” though many people are unaware of it.
Types of Marine Exhaust Systems
- Dry Systems
- Underwater Exhaust Systems
- Dry StackSystem
- Wet (water-cooled)Systems
- WaterSeparation Systems