Total Acid Number (mg KOH gm-1)###D-664###0.16###0.22###0.23###0.19###0.19###0.16###0.09###0.10###0.05 max
Summary of Changes in
Total Acid Numbers (TANs) and Total Organic Acid (TOA) Anion Concentrations Refrigerant Contaminant Changes in TAN, Changes in /Lubricant with Concentration, mg KOH/g TOA, ppm Contaminant PPm R-134a/POE 1000 0.05 -87 with R-1130 5000 0.42 91 30,000 6.27 13045 R-134a/POE 1000 0.05 -143 with R-1130(E) 5000 0.38 158 R-134a/POE 100 0.07 42 with R-1131 1000 0.05 -41 30,000 0.04 296 R-134a/POE 30,000 0.35 9 with R-1234yf R-1234yf/POE 5000 -0.10 -417 with R-1225ye(Z) 30,000 0.16 755 R-1234yf/POE 5000 -0.14 -364 with R-1233xf 30,000 0.29 172 R-1234yf/POE 5000 -0.23 -321 with R-1243zf 30,000 0.12 405 R-123/mineral oil 30,000 0.01 43 with R-1122 R-123/mineral oil 30,000 0 -20 with R-1123 R-123/mineral oil 30,000 0 -1 with R-1131 Table 4.
For transformer base oils the most important properties are color [14], water content [15], dielectric dissipation factor (DDF) [16] and
total acid number (TAN) [17].
The liquid phase in the sealed tubes was analyzed for
Total Acid Number (TAN), by Ion Chromatography (IC), and High Performance Liquid Chromatography (HPLC) to identify and/or measure the concentration of remaining process chemicals and/or decomposition products.
Test Method Sample number 1 2 3 Viscosity @ 40[degrees]C ASTM D-445 10.25 19.69 40.78 Viscosity @ 100[degrees]C ASTM D-445 3.23 4.95 8.66 Viscosity index ASTM D-2270 208 193 198 Flash point (opened) IP-35 117 189 225 Flash point (closed) IP-34 84 138 187 Pour point ASTM D-97 9 -12 <-30 TAN IP-177 0.41 0.5 0.19 (
Total acid number) Thermal stability, [degrees]C TGA 304 353 391 Oxidation stability, min IP-229 82 215 320
Total Acid Number (TAN) is a measure of the organic acid concentration in the fluid.
These factors include viscosity,
total acid number, and particle concentration, said Park.
So, Whirlpool was still forced to rely on particle counting or sophisticated laboratory analyses--such as sediment rating or the
Total Acid Number determination favored by oil suppliers--for a more scientific picture of oil condition.
By measuring increases in the system's
total acid number (TAN), maintenance engineers and plant managers can identify when the oil acidity is reaching the maximum acceptable level and act accordingly.
Each lubricant was first analyzed for moisture content and
Total Acid Number (TAN).