Research Report RR:D02-1675
This Research Report presents results of an Interlaboratory Study (ILS #298) to develop precision data for ASTM D7112-05a, Standard Test method for Determining Stability and Compatibility of Heavy Fuel Oils and Crude Oils by Heavy Fuel Oil Stability Analyzer (Optical Detection). D7112 uses the Finnish Measurement Systems Limited PORLA Heavy and Crude Oil Stability and Compatibility Analyzer. Five operators used 3 instruments at one test site to evaluate 11 samples covering a range of heavy fuel oils, various refinery residues, and crude oils to determine repeatability precision for P, Pa, Po, and FR1/5, [where the P value or peptizability is an indication of the stability or available solvency power of an oil with respect to precipitation of asphaltenes; Pa is the P-value of an asphaltene – the peptizability or ability of an asphaltene to remain colloidally dispersed, Po is the P-value of an oil matrix, and FR1/5 is the flocculation ratio at a dilution of 5 mL of xylene and n-heptane solvent mixture to 1 g of oil.] Statistical evaluation of the data also gives the recommended precision range for each parameter.
D7112-12 Standard Test Method for Determining Stability and Compatibility of Heavy Fuel Oils and Crude Oils by Heavy Fuel Oil Stability Analyzer (Optical Detection)
Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants
Subcommittee D02.14 on Stability and Cleanliness of Liquid Fuels