Safety Gas & Flame Detectors Protect Portable LNG Vapourisers


Operators at remote liquefi ed natural gas (LNG) production sites who rely on portable or skid mount vapouriser production equipment will fi nd General Monitors (USA) provides comprehensive gas and fl ame monitoring to prevent accidental explosions and fi res.


Gas wells are typically drilled at remote sites. Often times it is a result of either the location of the gas, proximity to the public or a combination of both situations. Regardless, power is rarely available and prohibitively expensive to obtain. Drillers have found a way around this obstacle by employing portable vapourisers and temporary Liquefi ed Natural Gas (LNG) sources.


LNG trucks are sent to potential drill sites along with portable vapourisers. After the connection is made, Compressed Natural Gas (CNG) is available to run a large power generator that is capable of providing power to the entire drill site. Once the site is producing gas and is self-sustainable, the LNG truck and vapouriser are moved to the next site.


Safety monitoring devices are always employed when LNG is being produced, used or stored due to its inherently explosive nature. LNG is stored at -260°F (-126°C) and as it is slowly warmed and vapourised it rapidly expands to 600 times its liquid volume. These harsh conditions are stressful on piping and valves which can result in potential leaks of combustible gas that endangers people, equipment and facilities.


To protect natural gas production sites, General Monitors offers a complete line of fi xed hydrocarbon gas and fl ame detectors. The company’s advanced catalytic bead, infrared point, and ultraviolet/infrared (UV/IR) technologies provide highly reliable hydrocarbon hazard monitoring in rugged environments.


General Monitors’ S4000CH Combustible Gas Detector provides thorough, continuous monitoring of combustible gases via its robust catalytic bead technology. The unit features one person calibration and can virtually self-calibrate by simply activating a magnetic switch and applying gas. It is designed to monitor natural gas and vapours within the lower explosive limit (LEL) and provide status indication and alarm outputs. It complies with ANSI/ISA 12.13.01-2000 performance requirements for combustible gas detectors.


The IR400 Point IR Gas Detector uses infrared technology to sense for combustible gases and vapours to quickly and reliably detect LNG gas leaks. The detector comes factory pre-calibrated, has a three-second response time, takes only minutes to set-up, operates with less than 4.8 W of power, and is inexpensive to operate and maintain.


The FL3100H UV/IR Flame Detector monitors for both ultraviolet and infrared (UV and IR) spectral ranges and is highly immune to false alarms caused by radiation sources. Continuous Optical Path Monitoring (COPM) checks both optical path integrity and electronic circuitry once per minute; a wide fi eld of view enables greater fi re detection coverage. The fl ame detector’s electronics are integral within its explosion- proof housing, allowing detector information to be processed at the point of detection.


Innovative Hybrid Technology for Gas Detection


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The Sensitron’s SMART S-IR is an innovative concept in the gas detection for the Premium Safety market. The detector uses a hybrid technology sensor (Pel+IR) installed in a single head. The behaviour of the sensors is constantly monitored by a microprocessor and the incoming signals are compared in order to supply an output corresponding to the worst situation revealed in the shortest time: it guarantees the highest accuracy with false alarm conditions close to zero.


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Other important features of the SMART S-IR are: non-intrusive calibration; 3 wires 4-20mA output with a further three relay output and HART communication module (optional).


The SMART S-SS and the SMART S-MS belong to the same family. The SMART S-MS is a double-head detector and two different sensors (Pel-IR; IR-IR; Pel-Electrochemical) can be installed on it.


It guarantees two different independent outputs that can be compared. The detectors are SIL 2(3) certifi ed in compliance with EN50402/EN61508 part 1 to 7. Sensitron invite readers to visit their web site for more details on the company and their products.


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Sensitron (Italy) has developed the innovative Hybrid gas detector, ATEX and SIL2 (3) approved. Among the gas detection instrumentation for tough environments an innovative alternative is now available, which compares the signals received from two different sensors (Pel+IR) installed in a single head setting the improper alarms apart.


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