Revision recommendations of GB 11174-2011 Liquefied Petroleum Gas

GB 11174-2011 Liquefied Peteroleum Gas is the national product standard of liquefied petroleum gas(LPG). Almost ten years have passed away since its publication and most of the test methods of the inspection items are not suitable for the current development situation. So it's time to revise GB 11174-2011. The items of the contents of LPG should be revised as follows: (1) the total content of the major hydrocarbons(C₃ and C₄) should not be less than 95%(volume fraction) while that of other components like dimethyl ether and hydrocarbons(C₅ and C₅ beyond) should not be more than 3%(volume fraction). (2) The system 2 in NB/SH/T 0230-2019 Determination of Composition in Liquefied Petroleum Gases by Gas Chromatography is recommended as the test method. (3) Meanwhile, the ultraviolet fluorescence method is recommended as the test method of the item of total sulfur content in LPG as the standard SN/T 4117-2015 Determination of Total Volatile Sulfur in Liquefied Petroleum Gases and Gasous Hydrocarbons by Ultraviolet Fluorescence. (4) Besides, the national standard about the determination of hydrogen sulfide in LPG by gas chromatography should be organized and advanced as soon as possible. (5) Gas chromatography is also recommended as the test method of the determination of LPG residues as the national standard GB/T 30518-2014 Determination of Dissolved Residues of Liquefied Petroleum Gases High Temperature Gas Chromatographic Method. The test results show good applicability and adaptability on the test of the components, the total sulfur content, the determination of hydrogen sulfide and residues of LPG by the above methods.