Complete systems to prevent diesel engine runaway in hazardous environments
Although diesel engines are safer than gasoline engines when working in hydrocarbon-rich environments, they can become an ignition source in certain situations. Diesel engine speed is controlled by an internal speed governor which meters the amount of fuel fed to the engine. If flammable vapors are present in the atmosphere, they are drawn into the intake system along with clean air, and the additional fuel causes the engine to accelerate.
As the engine speed rapidly increases, it draws in more air – and more vapors. The cycle continues until the engine is running off the unmetered vapors as its fuel source. If this cycle is not stopped, it can cause the engine to overspeed, or runaway, making it a potential ignition source for the explosive vapors and lead to:
Flames exiting the intake and exhaust pipes
Surface temperatures (auto ignition)
Catastrophic injury or death
For over 45 years, AMOT has promoted better safety in hazardous industries by raising awareness of the risks of operating diesel engines in these environments and educating industry professionals about ways to protect their equipment and people. We continue to invest in research and product technologies as diesel engines evolve to meet modern performance standards.
We work with engine manufacturers, oil and gas service companies, companies that provide support services, and operators to design complete systems that protect against diesel engine runaway and the risks of a diesel engine becoming an ignition source on worksites.
While some companies implement safety protocols to prevent diesel engine runaway, automatic positive air intake shutoff valves are the only reliable method to stop an engine once it has begun to overspeed. These devices work by completely blocking the engine’s air intake system, cutting off the external fuel source and the air required to keep the engine running.
Speed switches are used to monitor engine RPM in automatic diesel engine overspeed protection systems. In the event of an engine overspeed condition, the speed switch will immediately take action to shut down the diesel engine. Electric, hazardous area electric, and hydro-mechanical switches available.
Spark arrestors are designed to prevent the risk of fire due to spark emissions from diesel engine exhaust systems. They are commonly used in marine, oil & gas, mining, forestry and other hazardous area applications.
The master safety shutdown device monitors pressure or temperature on rotating machinery in hazardous and industrial applications. Should a loss or drop in pressure occur below the setpoint, the device will trip immediately.
Diesel engine fuel shutoff valves are designed for applications where fuel shut down is required as a part of automatic engine shutdown systems. The hydromechanical engine fuel shutoff valves are designed for use as failsafe valves in oil pressure based hydromechanical systems. The air intake depression engine fuel shutoff valve is designed to operate in combination with diesel engine air intake shutoff valves.