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BP安能欣SG-XP 220高温合成齿轮油 BP安能欣SG-XP 220高温合成齿轮油
BP安能欣SG-XP 220高温合成齿轮油 BP安能欣SG-XP 220高温合成齿轮油
BP安能欣SG-XP 220高温合成齿轮油 BP安能欣SG-XP 220高温合成齿轮油
BP安能欣SG-XP 220高温合成齿轮油 BP安能欣SG-XP 220高温合成齿轮油


Manufacture
Gasoline is manufactured from crude oil using various refinery processes to improve the quality and volume of fuel produced. Typically, a refinery will have a number of processes to make components which are then "blended" to give a fuel of suitable quality for the market.
Mogas is manufactured using many different refinery components to meet the demands of high volume production. Components often include reformate and alkylate, high octane materials, cracked spirit - an olefinic material - possibly oxygenated materials such as ethers (e.g. methyl tertiary butyl ether), alcohols (e.g. ethanol) and a host of other possibilities. If some of these components were used for AVGAS there could be disastrous consequences as discussed below.
AVGAS can only be made from a limited set of components of the highest quality. The octane and volatility requirements generally limit the choice of alkylate, isomerate and possibly reformate. As a result, only a limited number of the world's refineries have the capability to manufacture AVGAS. No ethers or alcohols are allowed in the blend as these have a low energy content and would reduce the range of aircraft. This is also captured in a minimum energy specification for AVGAS - there is no such specification for Mogas.
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Volatility
A gasoline engine requires a fuel which is sufficiently volatile to allow easy formation of the air and fuel vapor mixture required for combustion, while not being so volatile as to cause bubbles of vapor in the fuel lines ("vapor lock") resulting in fuel starvation. Specifications are set to control these properties based on the fuel's vapor pressure and distillation characteristics. These are different for Mogas and AVGAS.
After manufacture, small amounts of approved ethers and alcohols may be added as fuel system anti-icing additives. However, this is strictly controlled to meet particular operational requirements. High concentration of alcohols can attack fuel system components and cause seal swelling/failure. They can entrain water into the fuel and promote phase separation into water + alcohol/fuel phases, which may cause engine failure. AVGAS specifications help protect the aviator from these hazards.
AVGAS, and other aviation fuels, are very carefully controlled at the refinery and in the distribution system to ensure no contamination by other products. Red, green and blue dye, respectively, are added to distinguish between AVGAS 80, 100 and 100LL for instance. Quality control follows every batch ensuring it is clean and on specification, ready for use. Overall, AVGAS is the highest quality gasoline a refinery can manufacture.
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Specification Control
Two major specifications control AVGAS quality. The American Society for Testing and Materials through ASTM D910 and the United Kingdom Ministry of Defence through Defence Standard 91-90. These specifications are well aligned allowing any operator to confidently purchase fuel in practically any part of the world and be assured of correct performance.
All members of the industry - engine, aircraft, oil and regulatory bodies, meet regularly to ensure their customers needs are met and flight safety is maintained through the specifications. Many different specifications exist for Mogas across the globe to meet different climatic, environmental and economic requirements. Similarly to AVGAS, the specifications are agreed between the industry members. The aviation industry has no influence over these specifications, while the automotive industry has no influence over AVGAS specifications.