Temperature Is Our Business

Temperature Sensing for Marine Engine Efficiency

 

The maritime industry is evolving rapidly, driven by the need to reduce emissions and improve fuel efficiency. With stringent IMO (International Maritime Organization) regulations pushing for cleaner, more efficient operations, shipowners and operators must adopt innovative technologies to stay compliant.

One key factor in optimizing marine engine performance? Precision temperature sensing.

The Role of Thermocouples in Marine Engines

At the heart of fuel efficiency and emissions control lies temperature monitoring.

Thermocouples play a crucial role in optimizing fuel combustion in marine engines by ensuring the precise air-to-fuel ratio. This leads to:

  • Maximum engine efficiency – Helping reduce fuel consumption without compromising performance.
  • Lower emissions – Ensuring complete combustion to minimize harmful pollutants.
  • Improved engine lifespan – Preventing overheating and mechanical failures by maintaining optimal operating temperatures.


Monitoring Exhaust Gas Temperatures for Compliance

Regulatory bodies like the IMO have introduced measures such as the Energy Efficiency Existing Ship Index (EEXI) and Carbon Intensity Indicator (CII), making emissions control more important than ever.

High-performance thermocouples are essential for:

  • Monitoring exhaust gas temperatures to ensure compliance with environmental regulations.
  • Detecting potential inefficiencies in the combustion process.
  • Providing real-time data to engine control systems, enabling proactive adjustments for better performance.
     

Enhancing LNG-Powered Vessel Efficiency

As the industry shifts towards alternative fuels, LNG (Liquefied Natural Gas) is emerging as a cleaner option. However, LNG-powered engines require precise temperature control to ensure efficient combustion and safe operation. Okazaki’s advanced thermocouples are designed to:

  • Monitor cryogenic temperatures in LNG storage and fuel systems.
  • Enhance engine efficiency by optimizing fuel combustion and heat exchange processes.
  • Ensure safety by providing accurate temperature readings in extreme marine environments.
     

Built for Harsh Marine Environments

Marine applications present some of the most challenging operating conditions, including:

  • Saltwater exposure leading to corrosion.
  • Extreme temperatures from engine combustion and exhaust gases.
  • High mechanical stresses due to continuous vibrations and movements at sea.

Okazaki Manufacturing’s high-performance thermocouples are built to withstand these conditions, ensuring long-term reliability and accuracy. Our sensors provide ship operators with the critical data needed to improve fuel efficiency, comply with regulations, and extend engine lifespan.

The Future of Marine Efficiency

With tightening emissions regulations and the push for sustainability, precision temperature sensing will continue to be a cornerstone of marine innovation. As new propulsion technologies, such as hydrogen and ammonia fuel systems, emerge, advanced sensors will be required to monitor and optimize these next-generation engines.


#MarineTechnology #FuelEfficiency #EmissionsControl #TemperatureSensors #MaritimeInnovation

 

The VortexWell® and its Innovative Helical Strakes

The VortexWell® and its Innovative Helical Strakes

At Okazaki we are very proud of our VortexWell® Thermowell. So I thought it would be good to discuss the Helical Strake design we have used and how it works to greatly reduce the formation of Vortices.

Why the VortexWell®?

When fluid flows around a blunt object in it’s path, such as a standard Thermowell, it forms vortices downstream of the object. This is commonly known as Vibration Induced Vortices. The implications of these vortices can have a huge impact, from inaccurate readings to complete failure of the thermowell.

After extensive R&D and independent evaluation, we have developed a unique design of thermowell which we call the VortexWell®. This doesn’t require a velocity collar and is cost effective for the end user in terms of purchase, installation and maintenance costs.

What is the VortexWell®?

The VortexWell® incorporates an innovative helical strake design, very similar to the helical strakes seen on columns and cooling towers. By using the latest CFD software to visualize the flow behaviour, we were able to accurately compare a standard tapered thermowell and the VortexWell®.

In the tests, the standard tapered thermowell showed classic shedding behaviour as expected, whereas the VortexWell® demonstrated no signs of natural flow behaviour. The VortexWell® helical strake design disturbed the flow sufficiently to interrupt the regular formation of vortices. Whilst a small vortex was observed in the wake of the VortexWell® this was a localized stagnation point and didn’t shed.

How the VortexWell® works?

As the vortex shedding frequency approaches the thermowell natural frequency, the tip displacement and stresses are greatly magnified and the thermowell can fail. Even when the thermowell has passed calculations to the ASME PTC 19.3 standard, failures are still known to have happened, Monju Power Plant being a prime example.

 

To solve this issue, we looked at several different ideas, from increasing damping to streamlined cross sections. It was found that the best solution was to incorporate a helical strake as a vortex suppression method which made our VortexWell the best performing and safest thermowell available.

 

More information.

 

If you’d like to learn more about our VortexWell® Thermowell you can view more information here https://www.okazaki-mfg.co.uk/products/sensors/vortexwell-thermowell.

 

Alternatively, you can all us on 029 2081 4333 or email the team on sales@okazaki-mfg.co.uk.

 

Farnborough Airshow 22-26 July 2024

We will be exhibiting at the Farnborough Airshow between 22nd and 26th July.

We will advise more details of where to find us when we have them.

Hydrogen On-Line Conference 2022

On November 8th and 9th we be hosting a Showroom at the Hydrogen Online Conference.

You will be able to view a short presentation, download information about our products and join in live chats.

If you'd like to attend the event registration is free at www.hydrogen-online-conference.com. You will have access to the Keynote Presentations, Showrooms and networking area.

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Contact Details

t: +44 (0)2920 814 333
e: sales@okazaki-mfg.co.uk

Okazaki
Manufacturing Company
UK Limited

S4C Media Centre,
Parc Ty Glas,
Llanishen,
Cardiff.
Wales
CF14 5DU
United Kingdom