Значение и использование

This test method is suitable for use in calculating weights and volumes of the products outlined in Section 1. The information presented in this method can be used for determining quantities of the above-stated aromatic hydrocarbons in tanks, shipping containers, etc.

Область применения

1.1 This standard is for use in calculating the weight and volume of benzene, toluene, mixed xylenes, styrene, ortho-xylene, meta-xylene, para-xylene, cumene, ethylbenzene, 300 to 350°F and 350 to 400°F aromatic hydrocarbons, and cyclohexane. A method is given for calculating the volume at 60°F from an observed volume at t°F. Table 1 lists the density in pounds per gallon at 60°F for high purity chemicals.

1.2 Calculated results shall be rounded off in accordance with the rounding-off method of Practice E 29.

1.3 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.3.1 A complete SI unit companion standard has been developed in Test Method D 1555M.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

TABLE 1 Physical Properties

ProductFreezing
Point
°FBoiling
Point
°F60°F Density
in Vacuo
g/cc^A,BDensity in Vacuo
at 60°F
lb/gal^CDensity in Air
at 60°F
lb/gal^D Benzene42.0176.20.883737.37517.3662 Cumene-140.9306.30.865387.22197.2130 Cyclohexane43.8177.30.782656.53156.5225 Ethylbenzene-139.0277.10.870777.26697.2580 Styrene-23.1293.40.909797.59267.5837 Toluene-139.0231.10.870967.26857.2596 m-Xylene-54.2282.40.867847.24257.2336 o-Xylene-13.3291.90.883407.37237.3634 p-Xylene55.9281.00.864567.21517.2062

^A Based on regression of 2001 TRC Thermodynamic Tables, Hydrocarbons, NSRDS-NIST 75-121 (April 30, 2001). The data is presented in Appendix X1.

^B Specific Gravity has been deleted from this table as unnecessary to this standard. If needed, divide 60°F density in g/cc divided by 0.999016 g/cc. See Appendix X2.

^C Produced by multiplying the density in g/cc by 8.34540438 and rounding to 4 decimal places.

^D Produced using lb/gal = (Density · 1.00014992597 − 0.00119940779543) · 8.34540438, rounding to 4 decimal places. See Appendix X3.

Note—Densities (or weights) “in vacuo” represent the true density (or weight) if measured in a vacuum without the buoyancy effect of air acting on the liquid. It is representative of the actual amount of product present. Densities (or weights) “in air” represent what would actually be measured on a scale. The difference is on the order of 0.13 %. Modern densitometers measure density in vacuo and the ASTM and API recommend the use of in vacuo densities (or weights); however, the purchaser and seller should agree on which to use in their transactions.