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Case Study MEDOR Exp for sulfur compounds analysis in natural gas

Case Study MEDOR Exp for sulfur compounds analysis in natural gas
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Case Study MEDOR Exp for sulfur compounds analysis in natural gas - 1

Case Study N°NG1 – Natural gas monitoring – Medor Exp – updated: 09.10.15 Case Study Natural Gas Monitoring Applications Analysis of H2S, Mercaptans and/or THT with MEDOR Exp Context & Challenges Natural gas used for household consumption typically contains odorant sulfur components for safety reasons. As natural gas is normally odorless, the sulfur components are artificially added. When natural gas is transported between various companies, regions or countries, gas companies have to verify that the sulfur species are present as specified. For more than 30 years, Chromatotec® has manufactured the energyMEDOR, based on the gas chromatography principles, to measure H2S, mercaptans and THT in natural gas. Due to the advantages of the “MEDOR” technology, a new guideline was defined, ASTM D7493-08 (as the Standard Test Method for Online Measurement of Sulfur Compounds in Natural Gas and Gaseous Fuels by Gas Chromatograph and Electrochemical Detection). The energyMEDOR by Chromatotec® is fully compliant with this guideline. In most cases and despite the hazards related to natural gas, the analyzers are installed in safe areas where risks are minimized. In this particular instance, Chromatotec® was asked to supply a system to measure H2S, mercaptans and THT in a Class 1, div 2, group B,C&D hazardous environment. Class 1: Flammable gases, vapors or liquids Division 2: where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions Group B, C&D: Ethylene, propane gas group. Chromatotec® Solutions Instrument: Medor Exp The energyMEDOR, normally manufactured as a 19’’ rack design, has been re-packaged in a 3.25 cubic feet ATEX rated 316 SS enclosure. The system is wall-mounted. A Zpurge is installed and creates a constant positive flow of air inside the enclosure, thus making a positive pressure inside enclosure. The effect of this purge is to prevent toxic fumes from going inside the instrument in case of hazardous leakage. A device located on the side of the analyzer with visual display (green light) senses if the out-coming air flow supplied to the instrument is sufficient at minimum 4.8 Bars (70 psi). To be sure that there is a positive pressure inside the analyzer, a pressure probe has been placed inside the instrument and the pressure value is displayed at all times on the monitor. sales@chromatotec.com www.chromatotec.com

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Case Study MEDOR Exp for sulfur compounds analysis in natural gas - 2

Case Study N°NG1 – Natural gas monitoring – Medor Exp – updated: 09.10.15 The temperature inside the enclosure is also monitored and displayed at all times. Additionally, a temperature probe is placed in the instrument to correct the effect of the air flow on the chromatographic separation. A field CSA (US and Canada) certificate was obtained for this instrument. Beside the additional Z-purging, the components and the operation of the instrument are mostly identical to that of our standard energyMEDOR. An industrial computer is located inside the enclosure and has internal mouse and...

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