Liquefied petroleum gas cylinders belong to special industry equipment, so there are not many companies that have the qualification to produce liquefied petroleum gas cylinders. The corrosion, thinning, cracks, etc. of liquefied petroleum gas are very dangerous, and regular inspections must be carried out to ensure the safety of the cylinders. . So how should liquefied gas cylinders be tested? Let Tianlong LPG Cylinder Company answer your questions now.

　　At present, in the actual application of the quality testing standards for liquefied petroleum gas, density and vapor pressure are the most convenient parameters for testing. Because the standard does not specify a specific density value. The quality supervision department, based on years of experience in the inspection of liquefied petroleum gas in storage and the oil quality status of relevant enterprises, has stipulated the inspection density standard of the inbound liquefied petroleum gas. Below this standard. The content of components above C5 and evaporation residues generally meet the national standards and are directly stored; when they are higher than this standard. Chromatographic analysis must be carried out in accordance with SH/T0230 method.

　　Why the liquefied petroleum gas that meets the national standard cannot meet the needs of users. The reason is first of all saturated vapor pressure. When the liquid liquefied petroleum gas is stored in a closed container, as long as there is space in the upper part of the container. This part of the space will be filled with gaseous liquefied petroleum gas. When the upper part of the container is in dynamic equilibrium, the measured pressure in the gas phase space is the saturated vapor pressure of the liquefied petroleum gas under the current conditions. Well known. The saturated vapor pressure of liquefied petroleum gas has nothing to do with the size and liquid volume of the container, but only depends on the composition and temperature.

　　It can be seen from the data in the table that not only the saturated vapor pressure of C3 component is quite different from that of C4. The vapor pressures of the isomers of the same type of substance are also quite different. For example, the difference between n-butane and isobutane, butene-2, and butene-2 ??and n-isobutene is more than 30%. The saturation vapor pressure directly reflects the natural gasification capacity of the substance.

　　Liquefied petroleum gas detection standard:

　　GB17259 used liquefied petroleum gas cylinders, GB/T16739 automobile maintenance industry opening conditions, GB/T17676 gas vehicles and LPG vehicle signs, GB/T17895 natural gas vehicles and LPG vehicle terms, GB/T18344 vehicle maintenance, inspection, Diagnostic technical specifications, GB/T18364.1 Car LPG Filling Port (Spiral Type), GB/T18437.2 Gas Car Modification Technical Requirements for LPG Cars, QC/T247 LPG Car Special Device Technical Conditions, QC / T256 Liquefied Petroleum Gas Vehicle Modeling Test Regulations, QC/T672 LPG Vapor Regulator for Vehicles, QC/T673 Liquefied Petroleum Gas Solenoid Valves for Automobiles, QC/T675 Gasoline Solenoid Valves for Automobiles, QC/T689 LPG Bus Technical conditions.

　　Conclusion: In China, most refineries only carry out the wholesale of liquefied petroleum gas, and it is still liquefied petroleum gas supply companies that directly sell users. Supply units that no longer assume government functions need to "survive by quality and develop by efficiency." Whether the purchased liquefied petroleum gas can meet the needs of users is related to the destiny of the enterprise. [TianLong Testing] can provide liquefied petroleum gas testing, according to ASTM, ISO, EN, JIS and other international standards and GB national standards for related analysis and testing services for liquefied petroleum gas. If you want to learn more about testing knowledge, remember to pay more attention to Tianlong LPG Cylinder Manufacturing Company, or visit the website to learn more.