September 2003Temperature Measurement
Integrated Solutions
Piping for some hot process applications requires thermal maintenance devices to keep stream-end piping temperatures within specific limits. In such cases, conventional pipe jacketing has been regarded as a sufficient, but often very expensive, option. One alternative to pipe jacketing, tube tracing, does not effectively prevent problems caused by temperature variations along the process pipe wall. Frequently, tube tracing is used as an economical way to compensate for heat loss.
In low-temperature applications with broad temperature envelopes,steam tracing can be effective. However, in these types of applications, the position of the tracers and the temperature distribution in the pipe material are not considered important.
A new system for process temperature maintenance and uniform pipe wall temperatures consists of contoured bolt-on trace elements. Comparable in price to tube tracing, these elements are positioned strategically after heat dynamics in the operating piping system are modelled.
To prevent problems caused by unwanted heat variation, frequently the key is ensuring uniform pipe wall temperature. To accomplish this, it is necessary to manage the heat distribution in the pipe wall.
Proper heat distribution management depends on the number and placement of heating elements. This placement, in turn, depends on accurate modelling of process thermodynamics. Therefore, the heating element vendor should employ accurate process thermal analysis software for this purpose.
The figure provides an example of process thermodynamics modelling. Heat from steam at 159°C is applied from a contoured heating element to a pipe wall at defined intervals. Directly under the element, the wall temperature is 147°C. Note the decrease in wall temperature as the distance from the element increases, until a minimum of 132°C is reached.
The pipe’s wall temperature decreases as the distance from the heat element increases, until a minimum of 132°C is reached
At this point, heat conducted through the pipe wall from another heating element causes the wall's temperature to rise again. The wall temperature varies within a defined range, and the warmest and coolest points also can be identified readily.
Solving plant problems
The application of contoured pipe tracing after detailed thermal analysis has prevented problems caused by mixed vapours in sulphur processing at one plant, and addressed concerns associated with a common anhydrous vapour process in another facility. In the first case, the system prevented condensation and associated pipe corrosion. In the second, it prevented pipe blockage from precipitated material.
The critical role of temperature measurement in flame hardening Instrotech
Temperature Measurement
Flame hardening is a heat treatment process widely used on parts made from mild steels, alloy steels, medium carbon steels and cast iron. Accurate temperature measurement is not just important, but critical for the success of flame hardening.
Read more...Noncontact infrared temperature control in aluminium rolling process Instrotech
Temperature Measurement
The aluminium rolling process is critical to the aluminium manufacturing industry, where precise temperature measurement is essential for ensuring high-quality product output and protecting equipment. The Optris long-wavelength camera can accurately measure strip temperatures in cold rolling and coiling applications.
Read more...Where simplicity meets reliability Endress+Hauser South Africa
Temperature Measurement
The new iTEMP TMT31 temperature transmitter from Endress+Hauser combines simplified selection, ordering, installation and operation with the highest reliability and long-term stability in one product.
Read more...Smart cities and the role of video security
Surveillance Integrated Solutions
As cities around the world continue to embrace smart technology, including IoT that not only connects to people, but also the surrounding activity, the integration of advanced video security systems is crucial to ensure safety and efficiency in environments.
Read more...Automating car window defrosters
Temperature Measurement
Window defrosters are vital features in vehicles, particularly in colder climates. The automotive manufacturer seeks an efficient solution to quickly and precisely measure the temperature of the windows, ensuring that the connections, installed cables and wires work correctly and have no defects before the vehicle’s final release.
Read more...The benefits of offsite control rooms Astrosec
Surveillance Integrated Solutions
As the security landscape grows more intricate, control rooms – the crucial hub of security operations – need to adapt. With escalating costs, mounting threats, and a heightened demand for immediate responses, many organisations are reassessing the operations of their control rooms.
Read more...edgE:Tower video analytics integrated with SEON
Surveillance Integrated Solutions AI & Data Analytics
Sentronics has announced a new integration between its edgE:Tower advanced AI-driven video analytics solution and SEON, a Central Monitoring Software (CMS) platform. This integration enhances real-time situational awareness and automated threat detection for control rooms.
Read more...The impact of thermal imaging in steam methane reformers
Temperature Measurement
As global demand for hydrogen, ammonia and fertilisers increases, LAND is empowering steam methane reformer operators to unlock efficiency gains at existing plants to meet ambitious production targets while also safely decarbonising.
Read more...Proven indicators monitored in three dimensions ifm - South Africa
Temperature Measurement
The VVB30x continuously detects vibrations in three measurement axes and uses them to calculate proven indicators for evaluating machine condition.
Read more...Digital display electronic sensors Transducer Technology
Temperature Measurement
The Trantech TTED series is a versatile range of digital display sensors designed for high-accuracy measurement of pressure, flow and temperature.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version