Editorial

Explosion Safety EGV HYP – EHEDG certified vent panel for production facilities with highly elevated hygienic requirements

Meeting safety and process requirements at the same time is sometimes a challenge, especially in the pharmaceutical industry. Dust-handling equipment has to be equipped with explosion protective systems, which must also comply with all hygiene and sanitary requirements in production. The solution: Vent panels that can be used to produce hygienically sensitive powders.

The EGV HYP vent panel is an economical solution to the problem described, according to the strict criteria of the EHEDG (European Hygienic Engineering & Design Group). Specially designed for hygienically demanding processes, it protects the vessel in the event of an explosion by releasing flame and pressure. The smooth surface with the patented, full-flat, chamfered gasket system prevents deposits during the production process and during the cleaning of the system and thereby cross-contamination between batch processes. With the new, contrasting blue color of the seal, it is also easy to see if the seal is damaged and/or a mounting failure has happened.

The EGV HYP can be used without hesitation in critical systems such as spray dryers with / without CIP cleaning, fluid bed dryers and mixers and therefore offers a cost-effective safety solution according to the requirements of hygienic design.

 

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Fig.1: Certified in accordance with EHEDG: EGV HYP with patented, bevelled sealing concept for absolute hygiene. 

www.rembe.de

 

Intelligent signalling device NIMU Stop unnecessary downtime with non-invasive signalling systems

Throughout the chemical sector, processes operating at high temperatures and with highly corrosive process media are common. Traditional signalling devices were not always compatible with such conditions and therefore are often over-looked as an additional accessory to monitor the status of the rupture disc.

Developments in technology mean even companies in this sector can now use rupture disc signalling systems, helping not only improve productivity and safety but also supporting with environmental concerns. German manufacturer, REMBE, is the European leader in the manufacturing of pressure relief devices and explosion safety systems and their product range encompasses some of the most robust rupture discs and signalling solutions available to add significant operational value within the chemical industry. Here REMBE discuss how its intelligent signalling solutions will keep you informed about the status of your entire plant while not being affected by the harsh operating conditions.

For processes operating with potentially harmful media the ability to shut down the process quickly and safely mean the risk of leakage is eradicated. Complying with explosive atmospheres and intrinsic safety industry standards, the signalling devices are designed to provide rapid notification of rupture disc activation, helping ensure safe management of the process while minimising downtime. REMBE’s signalling devices can easily be integrated with customers control systems to provide visual or acoustic notification of disc burst or to shut down the plant where required.

With non-invasive signalling devices, which make it impossible for the process medium to escape, processes with critical pressures and demanding media can also be reliably monitored. The following text explains the non-invasive monitoring unit NIMU in more detail.

Stop unnecessary downtime

For customers for whom compatibility with harsh operating conditions is of paramount concern the NIMU (Non-invasive monitoring unit) is a reusable rupture disc signalling system designed for rapid notification of rupture disc activation even in the harshest chemical environments. The REMBE NIMU sensor is not in contact with the process meaning it is not affected by challenging process conditions or corrosive media.

The intrinsically safe NIMU is installed into a tapping within the outlet of the rupture disc holder, completely isolated from the process so it does not create any leak paths and is not damaged following disc activation - critical for chemical customers where leak paths cannot be tolerated.

With the traditional membrane type signalling devices, false alarms were unfortunately common place, as the harsh operating conditions could cause the device to activate even if the disc itself had not opened. This false signalling would cause unnecessary and costly process downtime. Unlike these traditional devices, the NIMU is not negatively affected by the process.

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 Fig. 1: Signalling device NIMU (Non-Invasive Monitoring Unit)

Additionally, membrane detection systems are single use, meaning additional replacement costs. With the NIMU this additional cost is eradicated – the NIMU enhances overall dependability of rupture disc installations while reducing long-term expenditure. Not only is the signalling device fully reusable following disc functioning it is also reusable after routine maintenance checks. Easy to inspect during such maintenance routines, its closed circuit design allows it to be refitted into the holder by the same operator inspecting the disc, simplifying and quickening the maintenance process, a must to meet the demanding productivity requirements within the chemical processing sector.

When used in combination with the REMBE IQ Safety Cockpit the operator can be instructed in the event of a system disruption and can implement the relevant emergency management protocols. The affected employees can be individually informed of a process shutdown and co-ordinated response to identify the cause and get the plant back up and running as quickly as possible.

Reliable Monitoring of Rupture Discs protecting FPSO processes

Rupture discs installed on a gas compressor module are designed to protect the tubes on a heat exchanger from rupturing due to overpressure. Rupture discs are selected due to their response time in milliseconds. As output is directly correlated to the production from the compressor module it is critical that a rupture disc with good life cycling capability is installed, otherwise as the operating pressures increase the rupture disc will be pushed to its operating limits and fatigue causing frequent failure and unnecessary loss of production through downtime. The vent lines of several heat exchangers and other equipment are typically connected the flare system with a common manifold to save space on deck. This leads to the fact that there is variable back pressure on the Rupture disc protecting a heat exchanger. This situation requires a double disc assembly. The first Rupture disc is designed is to protect the heat exchanger shell against excessive overpressure in case of tube rupture. The second disc is typically a forward acting disc designed to resist the back pressure and set at differential pressure the required relieving pressure of the first disc less the amount of maximum back pressure.

Conventional signallling devices which are invasive are not suitable for such a harsh environment since they would be wetted by the medium on the downstream of the second rupture disc. For customers for whom compatibility with harsh operating conditions is of paramount concern the NIMU (Non-invasive monitoring unit) is a reusable rupture disc signalling system designed for rapid notification of rupture disc activation even in the harshest chemical and corrosive environments. The REMBE NIMU sensor is not in contact with the process meaning it is not affected by challenging process conditions or corrosive media.

Engineers designed a version of NIMU for such double disc assemblies and a special design for forward acting rupture discs to provide a reliable and long life signalling device for such demanding applications of the Offshore industry. This way in addition to the first disc, the second disc’s condition could be continuously monitored improving the safety and reliability of the processes on FPSOs.

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Fig. 2: Double Disc Assembly

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Fig.3: Double Disc Assembly with signalling device NIMU

www.rembe.de

 

Signalling systems for the chemical industry

Avoid unnecessary downtimes with intelligent signalling systems

Rupture discs and safety valves have become indispensable for manufacturing companies in the chemical industry. However, there is a need to catch up in terms of signalling.

The opportunities offered to operators here are both diverse and economically interesting. With non-invasive signalling that can be integrated into the rupture disc, even processes with critical pressures and demanding media can be reliably monitored.

Processes involving high temperatures and highly corrosive media are widespread throughout the chemical industry. In the past, conventional signalling was not always compatible with such extreme conditions, which is why it is now often overlooked as an additional process monitoring system.

The use of modern signalling equipment not only helps to improve productivity and safety but is also helpful in terms of addressing environmental concerns. The German manufacturer REMBE is a European leader in the production of pressure relief devices, explosion protection systems and the associated signalling devices. The company's product range includes some of the most robust rupture discs and signalling systems available on the market. These solutions create significant operational added value in the chemical industry by reliably monitoring safety systems and critical pressure relief devices.

In processes involving potentially harmful media, the risk of leakage can be reduced via a quick and safe shutdown. REMBE's well-designed signalling systems comply with both industry-relevant standards for explosive atmospheres and the intrinsic safety standards. By providing rapid notification of a burst rupture disc, they help to safely control the process while minimising downtime. High-quality signal transmitters can be easily integrated into the existing control systems in order to transmit a visual or acoustic signal when the rupture disc bursts and to shut down the system if necessary.

Avoiding unnecessary downtime through non-invasive signalling

The NIMU (non-invasive rupture disc monitoring) signal transmitter is suitable for systems exposed to harsh operating conditions. This reusable monitoring system is explicitly designed to provide rapid notification of a burst rupture disc. The REMBE NIMU sensor does not come into contact with the process itself, so it is not affected by harsh process conditions or corrosive media and ensures maximum tightness even for systems containing extremely corrosive chemicals.

The NIMU is mounted in a blind tap in the outlet on the rupture disc holder. Thus, the signal transmitter is completely isolated from the process. Potential leakage after the rupture disc has burst is also prevented – this is essential for customers in the chemical industry where leaks cannot be tolerated.

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Fig. 1: Signalling NIMU (non-invasive rupture disc monitoring)

The signal transmitter is fully reusable not only after the rupture disc has burst, but also after scheduled maintenance work. During such maintenance work, the closed circuit of the rupture signalling system makes it easy to perform a function test – the rupture disc can then be reinserted into its holder. Furthermore, the operator can do this without external assistance, which simplifies and speeds up the maintenance process. This is simply a must in the chemical industry due to the demanding productivity requirements.

 

Reduce environmental risks

Environmental concerns such as emissions control have become increasingly important for chemical manufacturers. The ability to quickly detect a leak within the process without external support brings significant benefits.

On the one hand, the SBK signal transmitter ensures fast and reliable fault signalling via the bursting of rupture discs and, on the other hand, has the unique ability to monitor leaks from upstream rupture discs. REMBE has specially developed this signal transmitter for processes with high temperatures where alternative signalling systems may no longer be suitable. The combination of leak detection and signalling in one product is a cost-effective solution. The materials used remain stable even at extreme temperatures and ensure high reliability in the long term without the risk of premature failure.

If the SBK signal transmitter is integrated into the process control system, it provides continuous monitoring of the rupture disc and reliable fault indication when the rupture disc bursts. Even marginal leaks within the process are detected. The application of the SBK monitoring system in the chemical industry, where the loss of process media is costly or harmful to health, significantly increases plant efficiency. At the same time, it ensures compliance with safety and environmental standards.

Integrated signalling – reduce installation points, ensure reliable monitoring

Whereas with other signalling systems the rupture disc and signalling devices must be installed and maintained separately, the SGK versions allow the signalling to be integrated directly into the rupture disc. Thanks to their unique design, it is not necessary to run a cable out of the rupture disc holder, thereby eliminating the need to drill a hole for the signal cable. Especially for processes with a low set pressure, where (for example) the non-invasive NIMU signalling may not be suitable, the SGK signalling systems allow continuous monitoring. The SGK versions are available with the KUB and IKB reverse acting rupture discs and the ODV triple-section rupture disc.

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Fig. 2: KUB clean reverse acting rupture disc with integrated signalling and replaceable seal.

www.rembe.com

 

Explosion Proof ATEX/IECEx Zone 1 / 21 iPad Mini 6

Now CSA Certified for North America / Canada

Classes, Divisions and Zones


Atexxo Manufacturing has released the Apple iPad mini 6 which is global certified and suitable for use in Zone 1 and Zone 21 hazardous locations. The explosion proof iPads are originally manufactured by Apple then converted and certified according to the ATEX directives and IECEx standards by Atexxo Manufacturing. This makes the ATEX/IECEx Tablets suited for safe use in gas/vapour Zone 1 and dust Zone 21 hazardous areas. Sim-card can be installed by the end-user themselves. The devices are suited for Apple’s DEP (open) Business Manager Program.

All features of the original product are preserved, except for the fingerprint scanner.

The ATEX/IECEx iPad mini of the 6th generation comes with an aluminum case finish. The ATEX/IECEx iPads are suitable for use in extreme demanding environments. They are available in both 64gb and 256gb versions.

Beside safe use as a tablet computer, all versions are excellent for use as an explosion proof camera or RFID scanner. For Middle East countries, versions with blocked cameras are available.

Explosion safety level:

II 2G; II 2D; II 3D,  Ex db IIC T4 Gb, Ex tb IIIA T135°C Db, Ex tc IIIB T135°C Dc

Class I, Zone 1 AEx db IIC T4 Gb Class I Div 2, Group A, B, C, D T4

Features:

- 64Gb or 256 Gb + Cellular- Self Sim-Card Installation - Original Apple IOS software- Suited for Apple DEP (open) Business Manager Program- Global certified (ATEX, IECEx, UKCA, CSA, INMETRO)

 

Typical Applications:

- Connected fieldworker- Digital twins- - Industry 4.0- Oil and Gas extraction sites- Petro Chemical plants- Offshore platforms

For more information please contact our sales department

www.atexxo.com
This email address is being protected from spambots. You need JavaScript enabled to view it.
+31(0)186601299

Explosion vents to protect the bulk materials from environmental influences Certified weather resistance of explosion vents

Once again, REMBE GmbH Safety+Control is challenging the status quo of autonomous protective systems. Thus, the globally increasing environmental influences and weather extremes prompted REMBE engineers to test the protective effect of REMBE explosion vents also against weather-related water and air permeability.

Particularly in plants and processes with high demands on water and air tightness, explosion vents that are directly exposed to weather conditions due to their installation position often represent a potential point of entry and thus a hazard for the bulk materials themselves. REMBE therefore applies what is legally required for construction elements such as windows and doors to the various explosion vents in the explosion protection area. Within the framework of large-scale weather simulations, the REMBE explosion vent types ODV, EDP, EGV-HYP, as well as the new vent duct cover KAD-LIC have been tested for their properties of air permeability, watertightness and their resistance to wind load. BS EN 14351-1, the product standard for windows and doors, served as the basis and classification.

The results of the weathering test are extremely impressive. A comparison of the test results with real weather conditions shows that storms with wind forces of up to 14 on the so-called Beaufort scale (bft) - this corresponds to wind speeds of up to 166 km/h - have no influence on the protective effect of the explosion vents. Even in heavy rain in conjunction with wind speeds approaching 120 km/h, the explosion vents exhibit a high degree of tightness. A comparison with the windows used in the construction industry illustrates the high weather resistance: The REMBE explosion vents achieved the same and in some cases significantly better test results than the currently available windows for residential buildings.

What is the added value of weathering testing?

The REMBE explosion vents thus not only protect the plant in the event of an explosion through targeted explosion venting, but also ensure effective protection of the bulk materials themselves from external environmental influences during normal operation. The risk of contamination by water, dust and air as well as collateral damage due to swelling or excess weight is thus minimised.

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Fig. 1: Examples of the tested explosion vents (left: Explosion vent EDP; right: Explosion vent EGV HYP)

  • Certified weather resistance
  • Effective protection of the plant and its products from environmental influences
  • Air leakage of < 0.75 m³/h m joint length
  • Impervious to driving rain up to a wind force of 12 bft (120 km/h) and a precipitation rate of 440 mm/h
  • Wind stability up to a wind force of 14 bft (166 km/h)

www.rembe.de

This article can also be found in the issue below

 

 

 

Valve Sense: Smart inspection system for maintenance in hazardous areas

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Pioneering innovation from i.safe MOBILE and Senseven for simple leak detection in valves without interrupting the production process

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 i.safe MOBILE, innovation and world market leader for explosion-proof mobile devices and solutions, presents together with its strategy partner Senseven the mobile inspection system Valve Sense. Industrial customers can now use the software and AI-based system in conjunction with i.safe MOBILE’s IS540.1 smartphone to monitor critical valves in international explosive hazardous areas. This solution uses advanced sensor technology based on the proven acoustic emission method which can be easily applied by maintenance personnel via software guidance – without special training and expert knowledge. Companies can use the mobile inspection set consisting of a smartphone, measuring electronics, waveguide, sensors and a software package to regularly check their plants themselves during ongoing production, thus saving time and money. Intact valves ensure smooth operation, guarantee product quality and also provide safety for employees. Valve Sense helps to detect valve leakage of water, gas, steam or air at an early stage and to react promptly. With the combine expertise of both companies, Valve Sense meets the high demands of customers in the chemical, pharmaceutical, oil and gas sector and other demanding industries in explosive areas.  

Valve Sense – The new generation of valve inspection for Ex-zones 
With the launch of Valve Sense for Ex-zones, i.safe MOBILE and Senseven are pioneers in the market applying today’s digital capabilities to an inspection system for leak detection in valves. The user-friendly kit easily connects acoustic emission sensors to i.safe MOBILE’s innovative 5-G smartphone IS540.1 and transforms it into a smart valve inspection system through Senseven software. The software guides the user through the inspection process in a self-explanatory way and algorithms and artificial intelligence help with data analysis and provide immediate results on site.  All data is automatically stored in a back office – a cloud-based platform for the structured management of all inspection data  - to use it for further analysis and reporting. 

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Efficient maintenance process
In manufacturing plants, valve inspection is an important part of the maintenance program. Depending on the production process, there are often harsh operating environments with high temperatures, corrosive chemicals and abrasive particles. This can lead to damage on the valve and associated unplanned machine downtime. An estimated five to ten percent of all industrial valves leak. Undetected leaks caused by non-regular or improper maintenance can result in serious consequences such as injuries, raw material losses and thus produce costs or contamination/environmental pollution. By performing regular in-house valve maintenance with Valve Sense, companies have the option of only having to replace valves when they really have a defect. Functioning valves can continue to be used. And this can be done during the production process without having to test the valve functionality on an external test bench. This avoids a production standstill and at the same times ensures considerable cost and time savings. 

"Thanks to the cooperation with Senseven and the new, joint Valve Sense technology solution, we can now also offer our customers the most innovative mobile solution currently available on the market for valve monitoring in hazardous areas - with our usual reliable safety standards. The combination of Senseven's technology with our 5G smartphone IS540.1 offers our customers an enormous increase in efficiency in the area of maintenance“, comments Martin Haaf, CEO of i.safe MOBILE.

„Valve Sense is a revolutionary technology that will change the way industrial valves are monitored and maintained in hazardous environments. Our team of experts has worked tirelessly to develop a system that is safe, reliable and easy to operate”, says Michael Hettegger, CEO of Senseven. 

The Valve Sense set consists of a case containing the IS540.1 smartphone equipped with the Senseven software, the IS-VS1A.1 measurement electronics, a waveguide and acoustic emission sensors and will be available from Q3/2023. 

Further information can be found here and in the data sheet.

 

www.isafe-mobile.com
i.safe MOBILE on LinkedIn
i.safe MOBILE on YouTube 

This artilce can also be found in the issue below.

 

More than just a standard Highly specific safety concepts for hydrogen infrastructures

In the context of the desired decarbonisation, hydrogen is becoming increasingly important as an energy carrier (thermal utilisation) and as a starting material for chemical production lines (molecular utilisation). Plant operators and manufacturers of specific subcomponents often plan to use methane-hydrogen mixtures initially, and then to continuously increase their hydrogen content. The long-term goal is to completely substitute methane with hydrogen. However, it is often disregarded that the safety concepts and technologies suitable for the original methane operation are only functional to a limited extent or not at all for protecting plants, single components and infrastructure during operation with high hydrogen concentrations.

Particularly in the area of explosion protection, as well as pressure venting at medium to very high overpressures, the existing concepts must be carefully reviewed using the available models, and possibly re-evaluated. A comparison of the explosion characteristics of stoichiometric methane-air and hydrogen-air mixtures quickly makes this necessity clear.

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Fig1:Comparison of explosion characteristics under atmospheric conditions (20°C; 1.01 bar) 

Sources: BAM final report on research project 2539 and own investigations.

If the maximum explosion pressure at atmospheric conditions is about 8 bar in each case, significant increases can be observed both in the KG value (rate of pressure rise) and in the laminar flame propagation speed. This may mean that safety devices tested with methane explosions show too high inertia for the rapid pressure increase. Valve-type protective systems can be severely damaged when they respond that they do not return cleanly to their original state and their functionality is impaired or they are operated unsafely. Special care must be taken when designing and assessing the geometric dimensions and sizing. For example, certain length-to-diameter ratios of vessels and pipes, especially for hydrogen as a Class IIC gas, favour the tendency towards detonative transition. If explosions propagate from one vessel to another via a pipe, there is also the risk that the ignitable mixture is pre-compressed in the second vessel, which results in significantly higher explosion pressures compared to explosions under atmospheric conditions. A hydrogen-air mixture is also more susceptible to ignition than a methane-air mixture due to the lower ignition energies and ignition temperature. In addition to the expected more severe course of events, the probability of occurrence is also higher.

Hydrogen explosions under prepressure

In addition to the aforementioned secondaryprepressurisation in the event of an incident, there are applications in which ignitable mixtures are deliberately precompressed and can ignite uncontrollably under certain circumstances. For several reasons, these scenarios pose a special challenge with regard to the design of the corresponding equipment and to the constructive protection concepts.

Firstly, the existing normative regulations do not provide any models for the design of safety relief devices for gas explosions under prepressure. Due to the prepressure at high dynamics, the problem at hand is neither covered by DIN EN 14994 (Gas explosion venting protective systems) nor by DIN EN ISO 4126 (Safety devices for protection against excessive pressure). Thus, there are no assured design standards, which means that the problem is in the "grey area of safety technology". Secondly, the explosion dynamics are significantly influenced by barely assessable turbulence-generating effects, which primarily result from the geometry at hand. Thus, it is difficult to predict what explosion pressures, flame propagation speeds and rates of pressure rise are to be expected. Whether a detonative transition occurs and whether an explosion venting device is suitable to protect the present scenario therefore requires separate investigations.

One possible way to validate a safety concept for the "hydrogen explosion under prepressure" problem dealt with here – in addition to very complex numerical simulations – is experimental verification. For this purpose, the protection scenario is simulated as realistically as possible with flameproof components and the explosion pressure resistant concept is tested with regard to its functionality via repeated explosion tests. Starting from a stoichiometric methane-air reference test, either the proportion of hydrogen in the methane-hydrogen-air mixture, the prepressure or the combustion air ratio is increased when testing a pure hydrogen-air mixture, depending on the problem. By registering the pressure curves within the simulated structure, the maximum explosion pressure can be inferred and the tendency towards detonative transition can be estimated. The aim of the verification is always the identification of safe operating parameters as well as to check product suitability, as no standard product certification is available due to the lack of a normative basis. When selecting a suitable product/explosion venting device, it is important to ensure that it is not only suitable for explosion venting, but also guarantees a long and reliable service life under the prevailing conditions during normal operations. If the explosion venting device was an explosion vent or rupture disc, the burst pressure, operating ratio, working temperature as well as the occurrence of vibrations and cyclic loads and, of course, the corresponding material must be taken into account when making the selection.

REMBE GmbH Safety+Control has been a leader in the technological fields of Process Safety and Explosion Safety for almost 50 years. As such, the careful selection of suitable safety systems and (explosion) relief devices is a key aspect of the company's service portfolio. REMBE has thus built up a profound understanding of how to analyse customers' processes and plants and identify suitable protection technologies. In collaboration with REMBE Research+Technology Center GmbH, an independent testing laboratory accredited to EN ISO / IEC 17025:2018, REMBE can also validate even highly complex protection concepts on an experimental basis. Especially in scenarios where new technologies need to be tested, no assured design standards are available or high-precision protection concepts are required, it is precisely this multidisciplinary approach that enables REMBE to develop high-quality solution concepts. In collaboration with the customer, the company combines experimental verification with its extensive expertise in explosion safety and explosion venting solutions to create highly specific protection concepts tailored to the customer's processes.

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 Fig. 2: REMBE produces high-quality explosion vents and rupture discs that are not only aesthetically appealing, but also suitable for safely venting hydrogen explosions under prepressure.

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Fig. 3: Successful venting of a hydrogen explosion at REMBE Research+Technology Center GmbH.
REMBE Research+Technology Center GmbH (www.rembe-rtc.de)
REMBE Advanced Services+Solutions GmbH (www.rembe-services.de)
REMBE Kersting GmbH (www.rembe-kersting.de)
REMBE FibreForce GmbH (www.argusline.de)
 
This article can also be found in the issue below.
 
 
 
 
 
 
 
 
 
 
 
 

 

 
 
 

GSME and HOTSPOT detector Early detection of explosions + fires

 

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With the GSME and HOTSPOT detectors from REMBE, an artificial intelligence has been created that detects fire and explosion events at an early stage. The GSME detector is an artificial nose, "trained" for pyrolysis - popularly known as smoldering gases, while the HOTSPOT detector represents an artificial eye that already detects surface temperature changes of 1 ° C.

REMBE´s HOTSPOT X20 measures surface temperatures using an intelligent evaluation system, which divides the field of view into detection zones. A separate temperature threshold value can be set for each individual zone in order to tailor the detection to the process as far as possible. The HOTSPOT X20 can even identify small temperature increases (1°C) and enables to warn the operator of a fire or glowing embers at extremely early stages. The HOTSPOT X20 can also be used in explosion atmosphere up to zone 20 and under high dust loads and monitors a temperature range in the standard version of 0-200°C (higher temperatures possible, but typically not required).

Mainly hydrocarbon compounds are released when many substances thermally decompose. If there is incomplete burning without a flame and a low oxygen supply, carbon monoxide is created as well. The GSME X20 pyrolysis gas detector, for instance, has been designed for detecting these gases, even as they develop. Alongside carbon monoxide and hydrocarbon compounds, nitrogen oxide and hydrogen compounds (CO, HC, H2 and NOx) are also monitored. With the aid of an intelligent evaluation algorithm, a process behaviour can be ideally mapped and normal off-gasing be adopted. If a concentration increases above the usual level, the GSME X20 immediately triggers an alarm. The detectoris also suitable for explosion atmospheres up to zone 20, monitors concentration ranges from 0-100ppm.

When the location and mounting position are ideally designed in an explosion protection concept, HOTSPOT X20 and GSME X20 allow explosions and fires to be prevented through early detection.

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Fig1: GSME und HOTSPOT detector

About REMBE – the REMBE Alliance introduces itself

Most people associate REMBE with REMBE GmbH Safety+Control, the specialist for explosion safety and explosion venting worldwide. The company offers customers cross-industry safety concepts for plants and equipment. All products are manufactured in Germany and meet the requirements of national and international regulations. REMBE customers include market leaders in various industries, including the food, timber, chemical and pharmaceutical industries.

The company’s engineering expertise is based on almost 50years of application and project experience. As an independent, owner-managed family business, REMBE combines expertise with the highest quality standards and is involved in various specialist committees worldwide. Short coordination paths allow for quick reactions and customer-specific solutions for all applications, from standard products to high-tech special designs.

In addition to REMBE GmbH Safety+Control(www.rembe.de) with approx. 340 employees worldwide, headquartered in Brilon (Hochsauerland, Germany), and numerous subsidiaries worldwide (Italy, Finland, Brazil, USA, China, Dubai, Singapore, South Africa, Japan), four other companies operate under the REMBE umbrella brand:

• REMBE Research+TechnologyCenter GmbH (www.rembe-rtc.de)
• REMBE Advanced Services+Solutions GmbH (www.rembe-services.de)
• REMBE Kersting GmbH (www.rembe-kersting.de)
• REMBE FibreForce GmbH (www.argusline.de)

This article was Also featured in the November/December issue below 
 

Modular Design for Maximum Flexibility


 
The modular platforms of the HMI portfolio from Pepperl+Fuchs offer individual solutions for applications ranging from non-hazardous areas to Zone 1.
 


Modular design of VisuNet FLX


The VisuNet GXP and VisuNet FLX HMI device families enable maximum flexibility for use in the process industry. The modular design allows HMI systems to be configured to meet precise individual needs, providing extremely quick, simple service options in the field. This means that a comprehensive range of technologies, installation options, and peripherals is available for customers. Each HMI system consists of at least one computer unit and one display unit, each of which can be individually configured. The operator workstations from Pepperl+Fuchs are designed and certified for use in ATEX/IECEx Zone 1/21, Zone 2/22, and Div 1 applications. In addition, all products can be used in non-hazardous areas.

The VisuNet RM Shell 5 firmware developed by Pepperl+Fuchs for VisuNet thin clients is based on Windows 10 IOT 2019 LTSC and offers a simple way to make individual adjustments. The highest safety standards and flexible configuration options allow connection to numerous virtualized and conventional process control systems.


End-to-end thin client portfolio up to Zone 1/21


The product range is rounded off by rugged box thin clients for use in control rooms and switch cabinets. In addition, mobile tablet thin clients from Pepperl+Fuchs ensure a complete portfolio for virtualized and conventional process control systems. With the VisuNet Control Center software, the thin clients can be managed seamlessly and centrally — from Zone 1 to the control room.

ATEX Fans for Petrochemical Explosion Protection

Petrochemicals are chemicals obtained from refining petroleum, crude oil and natural gas, the primary and raw material sources that enable numerous aspects of modern daily life.Several high-tech separation processes are undertaken in petrochemical plants to convert these raw materials into chemical products such as propylene, xylene, methanol and ethylene. The chemicals are then used to produce everyday products such as plastics, cosmetics, tyres, resins, rubbers, adhesives, and even embalming substances. 

During these high temperature and intensive processes of separation the exhaust streams produce potentially hazardous and corrosive chemical and gas residues. It is crucial that exhaust systems are of the highest corrosion proof quality to ensure safe operation. 

Industrial exhaust fans suitable for this industry are designed for corrosion protection, explosion protection and protection against other elements such as heat, moisture, and salty air. Explosion proof ATEX exhaust fans safely remove and transport the hazardous gases away from personnel and prevent these gases from mixing with other elements to avoid explosions.

What is ATEX 

ATEX stands for atmospheres explosible and refers to an area where there is a potential for an explosion if there is the presence of combustible dust or gases. The potential for the explosion is separated by what is known as gas and dust zones. The more likely an explosion the lower the number related to the zone. For example, zone 0 gas area classification means that an explosion potential is continuously present, zone 2 would mean the explosion potential may occur abnormally and with zone 1 it would occasionally be present. This dictates the type or equipment and the protection rating required to ensure continual safety. The same idea is in place for combustible dusts with zone 20, 21 and 22.

Choosing a Suitable Petrochemical Exhaust Fan

304 stainless steel ATEX fans are the ideal choice due to their ability to handle the extreme temperatures of the fracking process whilst also resisting any corrosive gases that may destroy internal or whole fan components.

304 stainless steel fans are available in two constructions. Either only the internal components are manufactured using stainless steel, if it is only these parts that will be present in the corrosive air, or alternatively, if the entire fan is situated in a corrosive environment and is at risk of rusting as a result, then the entire outer casing and internal components can be manufactured from corrosion resistant materials while still having explosion protection up to zone 1 gases.

ATEX Temperature Classes in Petrochemical

There’s a huge number of processes involved in petrochemical production. The distillation of crude oil which contains a mixture of hundreds of hydrocarbons involves heating in a furnace and the resulting mixture is fed as a vapour into a distillation tower. The chemicals produced have different temperatures that separate them during the fractional distillation stage creating a temperature gradient in the tower <350°C to 25°C. Following the distillation step, cracking is the main process that breaks these mixtures down into hydrocarbons by means of high temperatures and pressure. Hydrocarbons are generally flammable, so its compulsory that ATEX fans are used. Wherever air is contaminated with flammable substances then there is a need for protection.

Industrial fans are temperature rated to ensure that they’re not used in an environment that would exceed the highest acceptable surface temperature on the fan motors surface. If the temperature exceeds this level, ignition of either the gas or dust is possible. This is a required indication that the customer should communicate before any industrial fan selection for an explosive environment. Temperature charts are useful in determining the correct T class based on chemicals in the air stream. For example, Hydrogen is a IIC Gas group with a T temp class making it one of the hottest, most dangerous gases. 

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