- Gel point (petroleum)
Gel point is the temperature at which
diesels or biodiesels freezes solid and can no longer flow by gravity or be pumped through fuel lines. This phenomenon happens when a fuel reaches a low enough temperature whereby enough waxcrystals have formed to prevent any movement in the oil.
For the fuel to become pumpable again, it needs to be brought above the gel point temperature to the
Ungel point, which is typically near its pour point. However, most of the waxes will still remain in solid form and the fuel as to be warmed up further till its Remix temperaturein order to completely remelt and redissolve the waxes.
additivesare therefore commonly added to diesel or biodiesels where cold temperature is expected. They act to reduce the formation of wax crystals in the fuel, thereby lowering the pour pointand the gel point of the fuel. Anti-gel additives may not necessarily affect the cloud point.
Cold filter plugging point
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