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Fuel pricing strategy
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Womp
Posted 2/11/2016 11:52 (#5103965 - in reply to #5103632)
Subject: RE: Fuel pricing strategy


E SD
If you run newer equipment shelf life of fuel is not what it used to be. One thing new engines don't like is poor fuel, injectors will be an issue very fast.




STORAGE LIFE
Under normal storage conditions diesel fuel can be expected to stay in a useable condition for:
• 12 months or longer at an ambient of 20C.
• 6-12 months at an ambient temperature higher than 30C.
As diesel gets older a fine sediment and gum forms in the diesel brought about by the reaction of diesel components with oxygen from the air. The fine sediment and gum will block fuel filters, leading to fuel starvation and the engine stopping. Frequent filter changes are then required to keep the engine going. The gums and sediments do not burn in the engine very well and can lead to carbon and soot deposits on injectors and other combustion surfaces.
The expected life of a diesel fuel is indicated by the oxidation stability test ASTM D2274. The test measures how much gum and sediment will be deposited after keeping the fuel at 95°C in the presence of oxygen for 16 hours. It roughly corresponds to one year storage at 25°C. A result of less than 20mg/L of sediment and gum after the test is considered acceptable for normal diesel.
ACCELERATED AGEING
The ageing process can be accelerated by the following conditions:-
• Contact with zinc, copper or metal alloys containing them. These metals will quickly react with diesel fuel to form unstable compounds.
• The presence of water. Water allows the growth of fungus and bacteria, these produce natural by-products such as organic acids which make the fuel unstable.
• Exposure to high temperatures.
• Exposure to dust and dirt which contain trace elements that can destabilise the fuel,
such as copper and zinc.
• Fuel composition. Some components in diesel fuel naturally age quickly.
PROLONGING THE STORAGE LIFE
Prolonging the storage life is achieved by removing or controlling the conditions described in the previous section. Important measures to take are as follows:
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