Standard Test Method for Sediment in Crude Oils and Fuel Oils by the Extraction Method
This test method covers the determination of sediment in crude oils and fuel oils by extraction with toluene. The precision applies to a range of sediment levels from 0.01 % to 0.40 % mass, although higher levels may be determined.
Extract test portion of a representative oil sample, contained in a refractory thimble, with hot toluene until the residue reaches constant mass. The mass of residue, calculated as a percentage, is reported as sediment by extraction.
Determination of sediment content
Crude petroleum and fuel oils - Determination of sediment - Extraction method
This International Standard specifies a method for the determination of sediment in crude petroleum and fuel oils by extraction with toluene. The precision applies to a range of sediment levels from 0,01 % (m/m) to 0,40 % (m/m), although higher levels may be determined.
Crude petroleum and fuel oils -- Determination of sediment -- Extraction method
Standard Test Method for Determination of Asphaltenes (Heptane Insolubles) in Crude Petroleum and Petroleum Products
Asphaltenes are the organic molecules of highest molecular mass and carbon-hydrogen ratio normally occurring in crude petroleum and petroleum products containing residual material. They may give problems during storage and handling if the suspension of asphaltene molecules is disturbed through excess stress or incompatibility. They are also the last molecules in a product to combust completely, and thus may be one indicator of black smoke propensity. Their composition normally includes a disproportionately high quantity of the sulfur, nitrogen, and metals present in the crude petroleum or petroleum product.
Determination of asphaltene content of petroleum products by precipitation in Heptane
Determination of asphaltenes (heptane insolubles) in crude petroleum and petroleum products
This standard specifies a procedure for the determination of the heptane insoluble asphaltene content of gas oil, diesel fuel, residual fuel oils, lubricating oil, bitumen and crude petroleum which has been topped to an oil temperature of 260 °C (see A.2.1).
The precision is applicable to values between 0,50 %(m/m) and 30,0 %(m/m). Values outside this range may still be valid, but may not give the same precision values. Oils containing additives may give erroneous results.