Significance and Use
3.1 Accurate knowledge of the weight and volume of butadiene is necessary for the orderly manufacture, storage, transfer, and sale of the material. These tables are suitable for use in these and similar aspects of butadiene commerce.
| Enter the table in the column for “Observed Specific Gravity,” headed 0.640, and note that against an “Observed Temperature” of 40 °F, the corresponding specific gravity 60/60 °F is | |
| Likewise, note that for 0.645 specific gravity opposite 40 °F, the corresponding specific gravity 60/60 °F is | 0.632 |
| This represents an increase of 0.005 in specific gravity 60/60 °F for an increase of 0.005 in the value at 40 °F. Therefore, by simple proportion, an increase in the specific gravity value noted at 40 °F from 0.640 to 0.642 increases the corresponding specific gravity 60/60 °F by 0.4 × 0.005 or | |
| Then, the specific gravity 60/60 °F corresponding to the observed specific gravity of 0.642 at 40 °F is 0.627 + 0.002 or | 0.629 |
| Enter the table in the column for “Specific Gravity 60/60 °F'' headed 0.625, and note that against an “Observed Temperature'' of 35 °F the factor is | |
| Hence, 1 U.S. gal of butadiene of specific gravity 0.625 at 60/60 °F and measured at 35 °F occupies a volume at 60 °F of | 1.027 U.S. gal |
| Then 45 500 U.S. gal measured at 35 °F occupy a volume at 60 °F of 45 500 × 1.027 or | 46 728 U.S. gal |
| Enter the table with 0.625 specific gravity and note that the weight of 1 U.S. gal is | 5.201 lb |
| Then 40 U.S. gal of butadiene at 60 °F weighs 40 × 5.201 or | 208.0 lb |
| The weight to be set on the filling machine is therefore | 208 lb, 0 oz |
| A tank of 10 000 U.S. gal capacity is observed to contain 1500 gal of liquid at 95 °F and consequently 40.1 psi gauge pressure and an observed specific gravity of 60/60 °F 0.627. The volume of butadiene vapors in the tank is obviously 10 000 − 1500, or | |
| Entering the table with either the temperature of 95 °F, or the gauge pressure of 40.1 psi, the volume of 60 °F butadiene liquid in each volume of vapor space is | |
| Then 8500 U.S. gal multiplied by 0.01404 gives the amount of butadiene in the vapor space expressed as U.S. gallons of 60 °F butadiene liquid and is | |
| This 121.0 gal of 60 °F butadiene liquid that is in the vapor space can be added to the liquid contents of the tank expressed as U.S. gallons of 60 °F butadiene to obtain the total contents of the tank. |
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| From Table 2 the factor to correct the 1500 gal from 95 °F and a specific gravity of 0.627 to 60 °F is 0.961; therefore, the liquid content of the tank in U.S. gallons at 60 °F is 0.961 × 1500 | |
| The total contents of the tank in U.S. gallons at 60 °F is 119.3 + 1441.5 or 40.1 | 1560.8 gal |
| The table can also be entered with the temperature of 95 °F or gauge pressure of 40.1 psi reading the vapor density in air of | 0.0734 lb/gal |
| The weight of butadiene in the vapor space of 8500 U.S. gal is therefore (8500 × 0.0734) | 623.9 lb |
| From Table 2 the 1500 gal of liquid of 0.627 specific gravity and 95 °F is multiplied by the factor of 0.961 to obtain the amount of butadiene at 60 °F (1500 × 0.961) | |
| From Table 3 the 1441.5 gal of butadiene at 60 °F with a specific gravity of 0.627 is noted to weigh 5.218 lb/gal; therefore, the weight of liquid butadiene is 1441.5 × 5.218 | |
| The total weight of butadiene in the tank is 623.9 + 7521.7 | 8145.6 lb |
Scope
1.1 The ASTM Butadiene Measurement Tables are for use in the calculation of quantities of butadiene. The accompanying Tables 1-4 cover the normal operating ranges for the reduction of observed specific gravity and volume to 15.6/15.6 °C (60/60 °F) and for the calculation of weight-volume relationships of butadiene.
1.2 These tables are applicable to both butadiene and butadiene concentrates (minimum of 60 % butadiene).
Note 1: These tables replace the existing tables in the National Institute of Standards and Technology Letter Circulars LC-736 and LC-757 and the Rubber Reserve Corp., Butadiene Laboratory Manual.
1.3 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.
