Tubeskin temperature measurements
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Catalog excerpts

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Electrical temperature measurement Temperature Specialists M Part of your business

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Alexander Wiegand, Chairman and CEO, WIKA Over the past 60 years, WIKA Alexander Wiegand SE & Co. KG has been a renowned partner and competent specialist for any task in the field of pressure, temperature and level measurement. On the basis of a steadily growing efficiency, innovative technologies are applied when developing new products and system solutions. The readiness to face all challenges of the market have been the key factors for WIKA to achieve a leading position in the global market. Within the WIKA group 7,300 employees are dedicated to maintaining and improving technology....

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Tubeskin temperature measurement applications 4 Product selection guide 12 WIKA/Gayesco services for tubeskin temperature measurements 13 WIKA product lines 15 WIKA - GAYESCO Your engineered product solution for tubeskin temperature measurements WIKA/Gayesco have been among the world leaders in the refinery and petrochemical industry for more than 50 years. The WIKA Group has further expanded by acquiring Gayesco International Inc. This strengthens the market position of the group in the field of electrical temperature measurement and on-site services. Together there are well...

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Furnace sections Direct radiation section The direct radiation section is typically where the radiation from the flame heats the tubes. The tubes can be vertical or horizontal, arranged along the refractory wall, in the middle or arranged in cells. The tubes are typically 300 - 450 mm (12 - 18") apart inside the furnace. In the illustration on the right, the process tubes are arranged horizontally and the burners are located in the middle of the furnace. Convection heat section The convection heat section is located above the direct radiation section. In this area the heat is not as intense...

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The purpose of tubeskin temperature measurements is to determine tube life and trending, and to provide safeguards within a system. By relying on accurate tubeskin thermocouples clients can safeguard heater operations at their facilities. This can increase tube life in furnaces and increase production. Accuracy ■ Provide accurate data to determine tube life assessment Durability ■ Withstand harsh firebox environment for prolonged periods and should last the minimum of one turnaround cycle Ease of installation ■ Secure weld attachment to the tube wall to fit any tube size ■ Fast installation...

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WIKA uses trained specialists to customise the temperature measuring points to the application. These specialists utilise best practices derived from scientific properties to optimise the life and accuracy of the thermocouple. They make suggestions to optimise the system for temperature, movement, and burner firing. Some design considerations that can help determine measuring points for the specific application in order to choose the best suitable product: ■ Material compatibility with furnace tube ■ Heat transfer (radiation, convection, conduction) ■ Junction (grounded, ungrounded) ■...

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Proper installation A correct installation is essential to an efficient tubeskin thermocouple system. WIKA/Gayesco services have created installation animations to help those clients who want to install the product themselves. WIKA/Gayesco services also provide installation support up to and including full turnkey installations for those clients who want to be sure that the systems are installed properly. Today, many major refiners, process licensors and furnace manufacturers rely on WIKA/Gayesco services to provide tubeskin thermocouple systems for them. Can we design a system for you?...

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V-Pad™ The V-Pad™ design includes a machined v-shaped block that is welded to the mineral-insulated cable. Features of the V-Pad™ include: ■ Material compatibility for various service conditions ■ Compaction of the mineral insulation inside of the V-Pad™ protects the measuring point from radiant temperature influences. ■ No special machining of the v-shaped block is required to match any tube profile. ■ The thermocouple is welded into the base of the V-Pad™ for maximum accuracy and fast response. ■ The engineered v-shaped block allows a full penetration weld between the junction and tube...

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The Refracto-Pad™ design utilises a Weld-Pad thermocouple and heat shield. Features of the Refracto-Pad™ include: ■ Strong welded connection to the process tube ■ Patented heat shield with a special insulating moulded part ■ Shield and sensor profile designed to match tube curvature. ■ Shield protects the sensor cable and allows for quick routing out of the radiant heat, increasing sensor life. Application criteria ■ Designed for high heat flux or difficult applications, including flame impingement ■ In harsh environments these sensors ensure reliable readings due to their patented shielded...

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The Xtracto-Pad™ design utilises a Weld-Pad attached to a guide channel and heat shield. Features of the Xtracto-Pad™ include all of the Refracto-Pad™ plus: ■ Removable thermocouple design allows the thermocouple to be replaced without any additional grinding or welding. It also allows for the weldable parts to be attached without the presence of the sensor. The Weld-Pad/guide channel, heat shield and clips can be put on by the manufacturer of the heater/boiler or even by the tube manufacturer in the case of special furnace tubes. ■ Special features to improve the reliability of the...

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The Weld-Pad design utilises a weld-on sheet that is welded to the furnace tube. Features of the Weld-Pad include: ■ Designed for low-temperature applications where accuracy is not crucial ■ Used for tracking trending temperatures ■ Low-cost alternative Application criteria ■ Grounded or ungrounded junction ■ Used when flame impingement is not a concern ■ Ease of installation ■ Small size

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Selecting a suitable tubeskin thermocouple can be a daunting task. There are numerous variables that can determine one sensor style over another. WIKA’s application specialists can review your application and provide custom-designed solutions to fit your needs. Below is a reference chart for sensor styles for specific applications. For an in-depth product review and consultation please contact a WIKA representative for more information. Legend: + Suitable ++++ Very good +++++ Excellent -- Not suitable

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