Web Wake frequency calculation.

Online tool instead of Excel.

WIKA now provides the wake frequency calculation for thermometer thermowells in accordance with ASME PTC 19.3 TW-2016 in a web-based version.

The new programme has adopted the proven and clear presentation of results from the previous Excel software.

Users have a choice - a freely accessible version allows the calculation for a single thermowell. 

With the full version, which requires registration and user verification, an unlimited number of thermowells can be calculated simultaneously. 

For reasons of data security, this registration takes place via Azure Active Directory B2C. A PDF function for documenting the calculation is included in both versions.

• WIKA products are marketed in Ireland through Instrument Technology.

@WIKANews #PAuto 

Thermowell design tool.

New Tool Can Turn 50 Hours of Thermowell Design Time Into 15 Minutes

The Rosemount™ Thermowell Design Accelerator is a free online thermowell design tool that eliminates manual thermowell iterations facing process design engineers when sizing thermowells. It is easy to use and intuitively guides users through complex projects, saving hours of wasted labour and resources. Users will be able to automatically iterate up to 1,000 thermowell tags with a single click – all optimised for their process conditions.

On average, engineers can spend 50 hours doing thermowell calculations for a single project. Nearly 20 variables related to process conditions and thermowell dimensions are used to find a safe and efficient solution. Temperature points often need to be recalculated three to four times using traditional trial-and-error methods before passing global standards for safe operation outlined by The American Society of Mechanical Engineers (ASME). Using the Thermowell Design Accelerator, engineers can reduce design ideation time to just 15 minutes.

The software uses ASME PTC-19.3 TW (2016) criteria and has built-in quality checks to confirm safe thermowell results that protect processes and the people that operate them. As the tool automatically iterates thermowell dimensional changes for safe use, it also tracks calculation history. Engineers get a breakdown for each thermowell iteration and the corresponding physical dimensional change to the thermowell as it calculates solutions. Engineers can review each step for how the thermowell was able to pass PTC criteria and have a reference for updating their design if process conditions change. It’s true design, not just thermowell pass or fail.

Thermowell Design Accelerator is easy to use. The onscreen image dynamically updates as tag data is input and the on-screen help feature identifies potential calculation issues like missing data or incorrect inputs. Plus, users get thermowell and matching sensor specification model codes for a quick and easy way to review, collaborate, purchase and share information with project teams.

#Pauto @EMR_Automation @Emerson_News @ASMEdotorg

Thermowell reduce fatigue failure in challenging processes.

Emerson has released the Rosemount™ Twisted Square™ Thermowell line, a solution that reduces dynamic stress, simplifies process calculations and provides more accurate temperature measurements. This new thermowell design was developed to address these issues while meeting demanding production requirements, increasing output and ensuring high product quality.

“We wanted to offer a solution that would give our customers more options for thermowells when they run into process design challenges,” said Jack Reuvers, Emerson senior lead engineer. “When changes happen during the late phases of projects it can delay start-up times and add a lot of extra cost and stress. Twisted Square Thermowells not only provide more options, but they can also save on design costs while supplying high-accuracy temperature measurements with a safe, robust design.”

Twisted Square Thermowells improve reliability and reduce risk of fatigue failure through their ability to dampen dynamic stresses caused by oscillating vortex pressures. These dynamic stresses can result in vortex-induced vibration (VIV), which is the primary source of thermowell stress failures.

The new design reduces VIV by over 90 percent. This helps to simplify process calculations by eliminating the need to size thermowells to reduce dynamic and frequency limits, saving engineering time and lowering costs without requiring design changes. It is ideal for use where conventional thermowells fail to meet the globally-accepted ASME PTC 19.3 TW standard for safe and reliable thermowell design.

Twisted Square Thermowells solve these challenges at a time when manufacturers are relying more on applications that require thermowells to withstand harsh or changing process conditions.

Typically, conventional thermowells are shortened and/or the outer diameter is increased to avoid VIV. These changes can result in decreased accuracy and/or slower response times for the measurement point. The dimensional adjustments recommended by the ASME PTC 19.3 TW calculations are often acceptable to maintain an appropriate measurement point, but in some cases, they may compromise temperature accuracy, making it difficult to implement.

 @EMR_Automation  #PAuto @Emerson_News

High temperature thermocouples!

Model TC80 series thermocouples from WIKA, were developed to measure extremely high temperatures. These high-temperature thermocouples comply with DIN EN 50 446 for temperature ranges up to 1,600 degree C.

A thermowell made from high-temperature alloy metal or high temperature ceramic, with or without an additional inner tube, protects the thermocouple from the process medium as well as mechanical and chemical damage. A wide selection of process connections, e.g. stop flanges, threaded collars and solid welded flanges, permit direct mounting to the process. For particularly critical applications there are designs with inert gas or compressed air purging or with pressure tight sealing.

For the more demanding applications, WIKA offer a ceramic material called Hexoloy that offers a high temperature strength, excellent thermal shock resistance, universal corrosion resistance with a high thermal conductivity equal to that of stainless steel and 5 times alumina and with exceptional wear resistance, 50% harder than tungsten carbide.

• WIKA products are marketed in Ireland by Instrument Technology.

Thermowell design prevents vibration.

For applications in processes with high flow rates, WIKA is now offering thermowells in the new ScrutonWell design. This variant damps the excitation that leads to vibrations, which in turn can cause failures.

The ScrutonWell design is applicable to all solid-machined, barstock thermowells from WIKA. The helical form of the stem is available in two versions: manufactured in a single piece or with helices welded onto it. Installation and removal are just as easy as with a standard thermowell.

ScrutonWell thermowells are recommended when a thermowell fails the strength calculation, according to ASME PTC 19.3 TW-2010, and where other optimisations (shorter or stronger stem or support collar) are not desirable. In comparison with the conventional stem form, the new design reduces the excitations causing vibration by more than 90%.

• WIKA products are marketed in Ireland through Instrument Technology.

Selecting thermowells

New tool helps users select the right thermowell early in the design process

Emerson Process Management has introduced an online thermowell calculation tool that incorporates the new ASME PTC 19.3 TW standard. The tool is now available free-of-charge on their site. Emerson is the first to make available an online tool offering a more automated approach to thermowell calculation as opposed to the traditional way of utilising spreadsheets.

"The new tool offers preliminary calculations and gives users the option to perform a quick pass or fail thermowell calculation," according to Danjin Zulic, Temperature Marketing Engineer, Emerson Process Management. "Users can save time by performing iterative, preliminary calculations to select the right thermowell earlier in the design process."

In addition to the tool, the web site has a link to an R21 Report request form for official evaluations. "Once the thermowell order is ready to be placed, the official R21 report provides detailed documentation of the thermowell calculation."

A video and white paper are also available on the web site that explains the new ASME PTC 19.3 TW standard. Enhancements in the new standards and thermowell calculation tool include different types of stem profiles, more accurate natural frequency equations, and a calculated Strouhal number. The new standard also provides natural frequency correction factors that take into account different components of the thermowell such as the mounting style and temperature sensor mass.

• Emerson's Jim Cahill has also written on this in his Emerson Process Experts Blog: Online Calculation Tool for Thermowell Installations 

More reliable thermowells

Compliance with the new ASME PTC 19.3 TW-2010 standard provides more reliable thermowells

Emerson Process Management’s Thermowell Calculation Service is now based on the new standard created by the American Society of Mechanical Engineers (ASME) that establishes the practical design considerations for thermowell installations. 

With the help of Emerson and other users, ASME updated its standard on thermowells from the previous standard created in 1974, to create the ASME PTC 19.3TW – 2010. The new standard is designed to help overall reliability of temperature measurement.  

Using this new standard, a specially trained Emerson team provides recommendations on thermowell design and installation best practices. Calculations done by Emerson, following the ASME PTC 19.3TW - 2010, provide the most up to date, accurate and complete thermowell recommendations.

Rosemount® thermowells are built with industry-standard ASME materials to provide users with safer, more reliable sensors for applications where a thermowell is needed. All Rosemount thermowells are manufactured with these properties to ensure consistency between the thermowell calculation and the thermowell that is installed in the application.

By using outdated standards to calculate thermowell size, there is an increased risk of failures due to increasing line sizes and pipe velocities. Emerson provides engineering assistance to avoid these failures by using the new ASME standard.

“The PTC 19.3 Committee collected feedback from end-users and manufacturers and considered experimental results from the last 30 years to bring the standard into the 21st century. The result is a comprehensive set of calculations that offer the designer a complete evaluation of the thermowell design for a set of process and installation conditions. Combine this with our world-class Thermowell Calculation Service and you have a calculation report you can rely on,” said Dirk Bauschke, engineering manager for Rosemount temperature sensors and thermowells, who represented Emerson on creating the new ASME standard.