Temperature Is Our Business

VortexWell – Solving Resonance Failure Issues


VortexWell – Solving Resonance Failure Issues

At Okazaki, we’ve always made it our absolute focus to solve issues that we know our clients constantly face.  So, when it comes to solving thermowell resonance failure issues, we’ve always strived to use the latest technological advances to find the latest solutions.  Which is why since the introduction of the VortexWell thermowell in 1999, our engineers have meticulously developed our solution; ensuring you benefit from market-leading temperature measurement.

A simple and effective solution, we recognise that the industry has been facing several issues when it comes to vortex induced resonance failures.  This is why we’ve continued our extensive research and development to find the most cost-effective and vastly technically advanced product available to you.  We also know that you want to find a solution that easily assesses and calculates potential issues.  The VortexWell meets all of these requirements and more.

Through its clever helical strake design, the VortexWell is able to encounter the issues faced by fluid flowing around a blunt object in its path; forming vortices downstream of the object – also known as vortex shedding.  We’re fully aware of the implications from the vortex shedding frequency or Stroudhal frequency approaching the thermowell natural frequency.  When faced with this situation, the tip displacement and stresses become greatly magnified; causing the thermowell to fail.  We also know that even when the thermowell has passed the ASME PTC 19.3 TW-2010 regulation, failures can still happen.

In considering alternative solutions to solve the original cause of the problem of vortex induced vibration rather than just masking the symptoms, our engineers looked at several ideas including adding a vortex suppression device, avoiding resonance, increasing damping and using a streamlined cross section.

Eventually our engineers discovered that incorporating a helical strake as a vortex suppression method certainly delivers the best performing and safest thermowell solution available.  Through this technique, engineers found that not only the flow disturbance was minimised thanks to its aerodynamic tip, but it also ended the possibility of vortex induced vibration.

If you’re interested in finding out how Okazaki can help you deal with your temperature challenges, contact us on sales@okazaki-mfg.co.uk.

Image 1: Showing flow around a standard Thermowell

Standard Thermowell Flow

Image 2: Showing flow around our VortexWell Thermowell

VortexWell Flow


Micropak – Small in Name, Huge in Performance


Micropak – Small in Name, Huge in Performance

In our last article, we focused on our specialism in vacuum operations. This piece features our specific range of Micropak heaters. With temperature being our core focus at Okazaki, we’re particularly proud to deliver our expert range of mineral insulated heaters perfectly suited to the vacuum industry.

The Micropak heater has been chosen by many of our clients across the globe as their ideal choice of heating solutions in varying applications such as ion implants, patterning, removing doping and valve heaters.

Certainly in the vacuum operation industry, we’re fully aware of the importance that you have in finding heating solutions that are highly effective and able to operate in extreme conditions. As the world’s leading manufacturer of mineral insulated cable, we’ve made it our commitment to design solutions that meet these extensive temperature needs. In fact, we’ve spent over the past 60 years, developing the latest products and using leading-edge technologies to meet the needs of our extensive range of clients. We also know that accuracy and reliability are extremely important for your ability in maintaining production and operation.

If flexibility is a key factor in your vacuum operation needs, the Micropak heaters certainly deliver. Being ultra-small, they offer far greater flexibility. They benefit from a small bend radius as a ratio to the outside diameter of the heater. Not only that, the units can be coiled and freely formed into complex shapes as desired. This makes them particularly ideal where space is limited.

As for the range of applications that the Micropak heaters are suitable, we’ve seen our Micropak heaters used for a wide range of applications. These have included analytical instrumentation devices, fuel cells and vacuum applications. You’ll also be able to choose from an extensive range of diameter, lengths, materials and terminations. Certainly, it’s highly feasible for a wide operating range to be achieved of between -200°C to 500°C.

At Okazaki, we’ve also had a strong belief that one size doesn’t fit all. So for this reason, we’re able to design the Micropak heaters bespoke to your specific application. These include conductor coil configuration in Model MP11; providing different outputs at specific points of the heater.

A further benefit of the Micropak heater is that it also has the same diameter hot and cold sections with no external join. This helps remove mechanical joint failure which also makes it ideal for installation into vacuum sealing flanges.


Experts in Heating for the Vacuum Industry


Experts in Heating for the Vacuum Industry

If you’re working in the semi-conductor industry, you’ll no doubt appreciate the importance of effective high temperature plate heaters when it comes to choosing the right products for vacuum operations. With temperature being our business, at Okazaki we’ve always specialised in delivering solutions that have the capability to operate in extreme conditions. Certainly superior performance and the ability to cater for a uniform surface temperature is absolutely key.

We know how you need solutions that adhere to very specific conditions. All of our plate heaters are fully manufactured and assembled at our dedicated facilities. As we use our own carefully designed mineral insulated heater thermocouples, you can be guaranteed that each unit is finished to the highest of standards. In fact, all of our units are extensively tested to ensure uniformity within 1% to make sure that they have the capability to operate to 1000°C.

We also recognise that one product doesn’t fit all. Which is why we’re able to offer a range of plate heaters in a variety of shapes and sizes – including round and square. Materials-wise, we’re able to give you a wide choice including aluminium Inconel alloys and stainless steel, amongst others.

Our Aeroheat heater in particular is a long-life mineral insulated metal sheathed heater. Having been manufactured from a single diameter cable with no internal joins to eliminate mechanical failure points, the heater assemblies benefit from an integrated un-heated cold section. This means that there’s no additional need for costly infrastructure such as water cooling pipe work or alternative systems to maintain lower temperatures. In addition to this, you’ll also look forward to a reduction in overall plant running cost – helping you to meet environment operating costs.

You can simply integrate the Aeroheat heater and its terminations into sealing flanges or ports, which means that full sealing is maintained – even in the highest of vacuum atmospheres.

Particularly beneficial in all forms of deposition equipment, the Aeroheat makes for an excellent choice in ALD, CVD, ion plating and sputtering. Precise temperature control can soon be achieved by arranging a set of multiple panel heaters. This is even possible with the largest of today’s and future glass substrates including Generation 10 and above. Plus, a circuit partition is also possible in order to compensate for any local temperature decrease caused by the carriers.


Out of this World Sensors and Heaters

Mars Rover

Out of this World Sensors and Heaters

When it comes to some of the most challenging environments known and even unknown to man, there can be few locations that are as challenging as the moon.  So, when Okazaki was challenged with delivering heaters and sensors for the NASA Mars Curiosity Rover, this certainly presented a worthy proposition.

At Okazaki, we’ve always understood that our valued clients across the globe require extreme levels of product reliability.  We know that time is money, and any impact on production or service can result in serious implications both financially and regarding safety.  We also know that our clients appreciate that world-class quality is our benchmark.

For the purpose of the NASA Mars Curiosity Rover, NASA opted to use Micropak heaters in order to heat the sampling tubes inside the vehicle.  The challenge here was to benefit from greater flexibility when space is particularly paramount. With a small bend radius as a ratio to the outside diameter of heater, the units proved flexible thanks to their ability to be coiled and freely formed into complex and desired shapes.

As part of their investigations, demands on working in an extreme temperature range were certainly met thanks to the operating range of -200 to 500°C which can be achieved by the Micropak heaters.

A further benefit to the project was that the Micropak heater has the same diameter hot and cold sections.  Also, it has no external join which reduces the risk of mechanical joint failure while at the same time as being suitable for being installed in vacuum sealing flanges.

At Okazaki, our engineers and developers are constantly looking to use the latest technical advances to improve the efficiency and safety of our products.  For more info on how our heating and temperature sensors can be used in extreme working environments, please contact Leona Lilford



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Contact Details

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

Manufacturing Company
UK Limited

Ashwood House,
66 Cardiff Road,
Taffs Well
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CF15 7QE
United Kingdom