Cylinders are special equipment in the industry, so there are not many companies that have the qualification to produce LPG cylinders. The corrosion, thinning, cracks, etc. of LPG are very dangerous, and regular inspections must be carried out to ensure the safe use of cylinders. So how to detect LPG cylinders?

　　At present, density and vapor pressure are the most convenient parameters for testing in practical applications of the quality testing standards for liquefied petroleum gas. 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 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 the C3 component is quite different from that of the C4 component. 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 testing standards: GB17259 liquefied petroleum gas cylinders for motor vehicles GB/T16739 opening conditions for automobile maintenance industry GB/T17676 natural gas vehicles and liquefied petroleum gas vehicle signs GB/T17895 natural gas vehicles and liquefied petroleum gas vehicles vocabulary GB/T18344 vehicle maintenance, Technical specification for testing and diagnosis GB/T18364.1 LPG filling port for automobiles (screw type) 　　 GB/T18437.2 Technical requirements for refitting of gas vehicles LPG vehicles QC/T247 Technical conditions for special equipment for LPG vehicles QC/T256 Liquefied Petroleum Gas Vehicle Modeling Test Regulations QC/T672 Liquefied Petroleum Gas Vapor Regulator for Vehicles QC/T673 Liquefied Petroleum Gas Solenoid Valves for Automobiles QC/T675 Gasoline Solenoid Valves for Automobiles QC/T689 Technical Conditions for Liquefied Petroleum Gas Buses.

　　Generally in our country, most refineries only carry out the wholesale of liquefied petroleum gas, and it is the liquefied petroleum gas supply enterprise that directly sells 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. [Cheng Cheng Testing] can provide liquefied petroleum gas testing, according to ASTM, ISO, EN, JIS and other international standards and GB national standards for relevant analysis and testing services for liquefied petroleum gas. If you want to know more about testing, you can contact us, Tianlong LPG Cylinder Company will answer you wholeheartedly.>>>More product details