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Author: Pierre Braud
Source: 2019 Appalachian Gas Measurement Short Course
Year Published: 2019
Abstract: All around the world, propane, butane and natural gas must be odorized. The odorization ensures a safe transport, distribution and use of this valuable energy to residential buildings. Regulations vary from one country or state to another. The natural gas can be odorized at different points of the gas grid: in some countries (France, Spain, South Korea...), odorization takes place at the entry points of the countrys gas grid, either at the gas transmission pipes or at Liqueed Natural Gas (LNG) terminals just after vaporization. In other countries (USA, Canada, Mexico, Germany, Italy, Belgium, China...), natural gas is often odorized at city gate level, where gas is depressurized to allow distribution to residential points. Odorants also may vary from one country to another, and within the same country as well. The International Organization for Safety (ISO) is listing in the ISO 13734(1) components commonly used: odorants are mainly composed of Suldes (TetraHydroThiophene, MethylEthylSulde, DiMethylSulde) and Light Mercaptans (mainly TertiaryButylMercaptan, IsoPropylMercaptan).

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