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STec RCI is simple, uses clean proven technologies, is
cost-effective, retrofittable and reduces toxic emissions by millions of tons annually.

STec Technology, Inc. specializes in the development, design, engineering and IP of clean energy marine technologies that address greenhouse gases emissions from diesel-powered boats. Over the years, STec has partnered with Shannon Boat Company to pioneer the way to reverse the massive environmental impact of marine pollution.  STec’s years of experience building and working on smaller vessels has provided unique insight into developing a non-vertical stack exhaust system that is practical, efficient and easily adaptable to both new and existing diesel-powered vessels.


The patented STec RCI exhaust system is the intellectual property owned by STec Technology, designed and engineered to be an add-on to diesel engines of existing and new boats, transforming the poisonous NOx from diesel exhaust to pure, clean air and water.

The STec
Reactive Catalytic Induction System:

  • Seawater is the primary catalyst with other elements

  • Electro-emulsification creates the molecular acceleration

  • Rotational helix creates cyclical mixing induction

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What makes the
RCI exhaust treatment system so unique?

RCI fits in the same space as conventional non-emission-controlled exhaust systems.


RCI is a totally new approach and solution to the complex issues found with marine exhaust systems. STec’s RCI diesel exhaust system uses proven technology based on University laboratory testing  and large ship vertical stack scrubbing exhaust systems. RCI capitalizes on the abundance of sodium chloride/salt in seawater coupled with other natural compounds accelerated by electro-emulsification and helix induction to create a compact horizontal exhaust system to mitigate dangerous NOx  and CO2 emissions. In addition, RCI was designed to allow auxiliary AC generators to use the same exhaust system as the primary propulsion engines eliminating redundant cost and building complications.

SCR Technology for NOx:
Good for trucks, not for boats

Diesel engine manufacturers have been working to adapt the SCR  (Selective Catalytic Reduction) system currently used on heavy/light truck diesels to boats with little success because of fundamental problems, a few of which are excessively high temperature requirements, equipment space needs, and the frequent replenishment of toxic DEF (Diesel Emissions Fluid) supply needed to make SCR work.   RCI technology avoids the excessive high heat, additional space requirements, dangerous ozone gases, high volume DEF additives and environmentally hazardous ammonia by-products using new clean simple technology. Since RCI is easily installed in place of existing exhaust plumbing layout designs, no engine modifications, engine room space or temperature environment are affected. RCI can also be retrofitted into most existing vessels. All of STec’s RCI emissions claims are independently verified by certified laboratories.

 Shown below are three examples of the modular simplicity of application to different vessel designs. (top) straight engine shaft (middle) jet drive and (bottom) vee drive: All models show AC generator exhaust using the same RCI propulsion engine exhaust system.

The STec Exhaust System
Technology is In Compliance with
IMO Regulations

IMO (International Maritime Organization) Regulations in Effect

stack scrubber.jpg

A  sea-going vessel with a vertical stack scrubber system

NOx emissions from large ships (over 300 feet) are currently regulated by the International Maritime Organization. The intent of the regulation is to provide environmental and health benefits for ports and nearby coastal areas by progressively decreasing emissions produced by ships using heavy bunker fuels, referred to by the IMO as “Sulphur Oxides (SOx) and particulate matter (PM).”  Ocean-going ships over 200 feet utilize a complex stack scrubbing system to remove pollutant gases from the exhaust from marine engines which primarily reduces SO2 and NOx secondarily but does not reduce CO2. Shipping represents 3% of global man-made CO2 (940 million tons of CO2 emissions produced annually).


A new UN IMO regulation took effect in 2021 that requires vessels 78'/24m long and over to reduce NOx emissions by 80%.  It is anticipated that even smaller vessels will be included soon. Unlike large sea-going ships, smaller vessels do not have the space in their engine rooms to deploy the complex seawater scrubber equipment or the 30' + tall stack required to discharge the scrubbed exhaust into the atmosphere.


Commercial and Recreational Vessels

The STec Reactive Cyclic Induction diesel exhaust system solves the problem of marine diesel emissions putting all new vessels and existing vessels under 300’ in compliance with the strict global regulations enacted by the IMO. It is the only diesel exhaust treatment system that does not require caustic or corrosive materials and does not harm the environment. It provides a cost-effective modular exhaust treatment system for both propulsion engines and auxiliary AC generators to top boat builders/operators of new commercial vessels, tour boats, ferries and recreational boats between 78’ and 300’ that will fit in their engine rooms without modifications to the vessel hull plans.

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