Gas Detection 47 Slurry Gas Detection - CoGDEM Comment


The risk of hazardous gases in agricultural workplaces has been highlighted once again after the tragic death in June 2014 of a farmer’s young son in Northern Ireland due to inhalation of toxic slurry gases. The disposal and storage of animal waste will generally always lead to the production of various gases, including methane, carbon dioxide, hydrogen sulphide and ammonia. These gases can remain trapped within the liquid waste until it is agitated by mixing, pumping, stirring or similar activities which can allow the gases to be released into the surrounding air. In confi ned spaces these gases can build up to reach harmfully toxic concentrations, and in some circumstances they can also displace the normally fresh air to produce an oxygen defi cient atmosphere capable of asphyxiation.


After a member company spotted an error in a news report about the Northern Ireland fatality, CoGDEM arranged to be interviewed on BBC Radio Ulster to put the record straight about the detection of slurry gases. It pointed out that in a perfect world, nobody should enter any space where slurry is being stored or treated, such areas should be well ventilated and signposted, with access doors or gates locked to prevent accidental entry. But if entry is unavoidable, for example to clean a tank that has just been emptied, or to manually clear a blockage, then farm workers must be made aware of the risk of atmospheric contamination. Normal precautions for confi ned space entry should of course be followed, and the worker should use a gas detector to check the air quality prior to entry and monitor it throughout the duration of the work.


It is not expected that all farmers will own a portable multi-gas detection instrument and have it ready for any such eventuality, but the interview was intended to let farmers know of the existence of such apparatus (as used routinely by Fire & Rescue Services), and that hire companies stock such products so that they can be rented during periods of planned maintenance or short-notice activities. Robust and reliable gas detectors can be invaluable life-saving companions, as they are in many industries facing gas hazards every day.


The interview also covered other points about slurry gas, such as the misconception that it will always be heavier than air. Two of the component gases, methane and ammonia, are considerably lighter than air, so these could well be present at the top of a stairway leading down to a slurry pit underneath a cowshed, for example. It was also pointed out that workers should not rely on their sense of smell to alert them to the presence of slurry gas, as gases such as hydrogen sulphide that produce a characteristically unpleasant odour can knock out a person’s ability to smell when the concentration becomes high enough.


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The SILO2 Oxygen Analyser utilises two continuous self-monitoring microprocessors and the complete system (analyser and sensor) meets the requirements of IEC 61508 SIL2. The SILO2 analyser is designed for safe area installation with a single input intrinsically safe connection for a variety of hazardous area located ATEX certifi ed Ntron oxygen sensors, via an integral galvanic isolation barrier.


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The analyser incorporates an easy to read LCD display of oxygen concentration. Calibration of the analyser/ sensor combination is made easy via the user accessible Span push buttons. The analyser offers the user an analogue output 4-20 mA RS232 / RS485 and 3 confi gurable alarm relays.


Ultrasonic Leak Detector Receives DNV Type Approval for Marine Applications


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Emerson Process Management’s (USA) Rosemount Analytical GDU-Incus ultrasonic leak detector has received the highly respected Det Norske Veritas (DNV) type approval. This DNV certifi cate further confi rms the device is suitable for use on-board marine vessels including LNG and LPG carriers, crude oil tankers, and fl oating production, storage and offl oading (FPSO) units, all of which can suffer loss of production, or worse, in the event of a gas leak not being detected quickly.


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“Detecting gas leaks in marine environments is challenging for traditional detectors which require the accumulation of a gas cloud in order to alarm,” said Eliot Sizeland, Emerson’s head of sales and marketing for the GDU-Incus. “Extreme weather and wind on vessels and platforms may prevent a gas leak from being rapidly detected, potentially allowing the incident to escalate when a quick maintenance repair may have been possible without loss of production. Since the GDU-Incus responds to the ultrasound produced by the leak, however, its performance is unaffected by these conditions. That makes it ideal for marine applications. We’re very proud that the detector withstood the rigorous testing required for the DNV certifi cation, which further demonstrates the quality and robustness of the ultrasonic gas leak detector.”


Emerson’s ultrasonic leak detector receives DNV type approval for marine applications


The GDU-Incus is an advanced leak detection system using four sensitive acoustic sensors that constantly monitor wide areas for ultrasound generated from the release of pressurised gas. The GDU-Incus is suited for monitoring ventilated outdoor applications, and is engineered to withstand extreme conditions. Performance is unaffected by inclement weather, wind direction, leak direction or any potential gas dilution, with an instantaneous response to methane, hydrogen and other low molecular weight gases.


The reliable, easy-to-use GDU Incus advanced gas sensing technology does not require calibration or replacement for the life of the instrument. An integrated self-test ensures fail safe operation, and innovative sensors with no moving parts mitigate the need for maintenance.


The DNV type approval assures potential users that the GDU-Incus has undergone rigorous testing and has been determined to meet the highest quality standards. The DNV assessment process is built upon scientifi c research and recognised by regulators, insurers, and major clients throughout the world.


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Ntron Gas Measurement Systems (Ireland) has recently launched their SILO2 oxygen analyser designed for safety critical applications. Ntron has over 30 years of experience in supplying Oxygen Analysis based Inerting Control Systems to the Chemical and Pharmaceutical industry. The Ntron SILO2 analyser was specifi cally designed for OEM and end user to address the market requirements for a low cost SIL2 oxygen analyser for inertisation applications: Centrifuges, Reactors, Mills, Glove Boxes and Vent Headers.


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E: info@ddscientifi c.com 24/04/2014 11:24


www.envirotech-online.com IET Annual Buyers’ Guide 2014/15


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