1、Designation: D 2502 04An American National StandardStandard Test Method forEstimation of Mean Relative Molecular Mass of PetroleumOils from Viscosity Measurements1This standard is issued under the fixed designation D 2502; the number immediately following the designation indicates the year oforigina
2、l adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the estimation of the meanrelative molecu
3、lar mass of petroleum oils from kinematicviscosity measurements at 100 and 210F (37.78 and98.89C).2It is applicable to samples with mean relativemolecular masses in the range from 250 to 700 and is intendedfor use with average petroleum fractions. It should not beapplied indiscriminately to oils tha
4、t represent extremes ofcomposition or possess an exceptionally narrow mean relativemolecular mass range.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns
5、, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3D 445 Test Method for Kinematic Viscosity o
6、f Transparentand Opaque Liquids (the Calculation of Dynamic Viscos-ity)2.2 ASTM Adjuncts:Mean Relative Molecular Mass of Petroleum Oils fromViscosity Measurements (D 2502)43. Summary of Test Method3.1 The kinematic viscosity of the oil is determined at 100and 210F (37.78 and 98.89C). A function “H”
7、of the 100Fviscosity is established by reference to a tabulation of Hfunction versus 100F viscosity. The H value and the 210Fviscosity are then used to estimate the mean relative molecularmass from a correlation chart.4. Significance and Use4.1 This test method provides a means of calculating themea
8、n relative molecular mass of petroleum oils from anotherphysical measurement.4.2 Mean relative molecular mass is a fundamental physicalconstant that can be used in conjunction with other physicalproperties to characterize hydrocarbon mixtures.5. Procedure5.1 Determine the kinematic viscosity of the
9、oil at 100 and210F (37.78 and 98.89C) as described in Test Method D 445.5.2 Look in Table 1 for 100F (37.78C) viscosity and readthe value of H that corresponds to the measured viscosity.Linear interpolation between adjacent columns may be re-quired.5.3 Read the viscositymean relative molecular mass
10、chartfor H and 210F (98.89C) viscosity. A simplified version ofthis chart is shown in Fig. 1 for illustration purposes only (Note1). Interpolate where necessary between adjacent lines of210F viscosity. After locating the point corresponding to thevalue of H (ordinate) and the 210F viscosity (superim
11、posedlines), read the mean relative molecular mass along theabscissa.Example:Measured viscosity, cSt:100F (37.78C) = 179210F (98.89C) = 9.72Look in Table 1 for 179 and read the corresponding value H= 461.Using H = 461 and 210F viscosity = 9.72 in conjunctionwith chart gives mean relative molecular m
12、ass = 360 (see Fig.1).NOTE 1A 22 by 28-in. (559 by 711-mm) chart available as an adjunctto this test method was used in cooperative testing of the method. If othercharts are used, the precision statements given in the Precision section willnot apply.1This test method is under the jurisdiction of AST
13、M Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.04 on Hydrocarbon Analysis.Current edition approved April 1, 2004. Published April 2004. Originallyapproved in 1966. Last previous edition approved in 2002 as D 250292(2002).2Hirschler, A. E., Jou
14、rnal of the Institute of Petroleum, JIPEA, Vol 32, 1946, p.133.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM websit
15、e.4Available from ASTM International Headquarters. Order Adjunct No.ADJD2502.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.TABLE 1 Tabulation of H FunctionKinematicViscosity,cSt at 100F(37.78C)H0 0.2 0.4 0.6 0.82 178 151 126 104 85
16、3 67 52 38 25 134 1 9 19 28 36544 52 59 6 736 79 85 90 96 1017 106 111 116 120 1248 128 132 136 140 1449 147 151 154 157 16010 163 166 169 172 17511 178 180 183 185 18812 190 192 195 197 19913 201 203 206 208 21014 211 213 215 217 21915 221 222 224 226 22716 229 231 232 234 23517 237 238 240 241 243
17、18 244 245 247 248 24919 251 252 253 255 25620 257 258 259 261 26221 263 264 265 266 26722 269 270 271 272 27323 274 275 276 277 27824 279 280 281 281 28225 283 284 285 286 28726 288 289 289 290 29127 292 293 294 294 29528 296 297 298 298 29929 300 301 301 302 30330 304 304 305 306 30631 307 308 308
18、 309 31032 310 311 312 312 31333 314 314 315 316 31634 317 317 318 319 31935 320 320 321 322 32236 323 323 324 325 32537 326 326 327 327 32838 328 329 329 330 33139 331 332 332 333 333H0 1 23 45678 940 334 336 339 341 343 345 347 349 352 35450 355 357 359 361 363 364 366 368 369 37160 372 374 375 37
19、7 378 380 381 382 384 38570 386 387 388 390 391 392 393 394 395 39780 398 399 400 401 402 403 404 405 406 40790 408 409 410 410 411 412 413 414 415 415100 416 417 418 419 420 420 421 422 423 423110 424 425 425 426 427 428 428 429 430 430120 431 432 432 433 433 434 435 435 436 437130 437 438 438 439
20、439 440 441 441 442 442140 443 443 444 444 445 446 446 447 447 448150 448 449 449 450 450 450 451 451 452 452160 453 453 454 454 455 455 456 456 456 457170 457 458 458 459 459 460 460 460 461 461180 461 462 462 463 463 463 464 464 465 465190 465 466 466 466 467 467 468 468 468 469H0 1020304050607080
21、90200 469 473 476 479 482 485 487 490 492 495300 497 499 501 503 505 507 509 511 512 514400 515 517 518 520 521 523 524 525 527 528500 529 530 531 533 534 535 536 537 538 539600 540 541 542 543 544 545 546 547 547 548700 549 550 551 551 552 553 554 554 555 556800 557 557 558 559 559 560 561 562 562
22、563900 563 564 565 565 566 566 567 567 568 569D25020425.4 Report the mean relative molecular mass to the nearestwhole number.6. Precision and Bias6.1 The precision of this test method as obtained by statis-tical examination of interlaboratory test results is as follows:6.1.1 RepeatabilityThe differe
23、nce between successive testresults obtained by the same operator with the same apparatusunder constant operating conditions on identical test material,would in the long run, in the normal and correct operation ofthe test method, exceed the value 3 only in one case in twenty.6.1.2 ReproducibilityThe
24、difference between two singleand independent results, obtained by different operators, work-ing in different laboratories on identical test material, would inthe long run, in the normal and correct operation of the testmethod, exceed the value 25 only in one case in twenty.6.2 BiasSince there is no
25、accepted reference materialsuitable for determining bias for this test method, no statementof bias can be made.6.3 The precision for this test method was not obtained inaccordance with RR:D02-1007, “Manual on Determining Pre-cision Data for ASTM Methods on Petroleum Products andLubricants.”7. Keywor
26、ds7.1 kinematic viscosity; mean relative molecular mass;petroleum oilsTABLE 1 ContinuedKinematicViscosity,cSt at 100F(37.78C)HH0 100 200 300 400 500 600 700 800 9001 000 569 574 578 583 587 591 594 597 600 6032 000 605 608 610 612 614 616 618 620 621 6233 000 625 626 628 629 631 632 633 634 636 6374
27、 000 638 639 640 641 642 643 644 645 646 6475 000 648 649 650 651 652 652 653 654 655 6566 000 656 657 658 658 659 660 660 661 662 6627 000 663 664 664 665 665 666 666 667 667 6688 000 668 669 670 670 671 671 671 672 672 6739 000 673 674 674 675 675 676 676 677 677 677H0 1000 2000 3000 4000 5000 600
28、0 7000 8000 900010 000 678 681 684 688 691 694 696 699 701 70320 000 705 707 709 711 712 714 715 717 718 71930 000 720 722 723 724 725 726 727 728 729 73040 000 731 732 732 733 734 735 736 736 737 73850 000 739 739 740 741 741 742 743 743 744 74460 000 745 746 746 747 747 748 748 749 749 75070 000 7
29、50 751 751 752 752 753 753 753 754 75480 000 755 755 756 756 756 757 757 758 758 75890 000 759 759 759 760 760 760 761 761 761 762100 000 762 762 763 763 763 764 764 764 764 765FIG. 1 Viscosity-Mean Relative Molecular Mass ChartD2502043ASTM International takes no position respecting the validity of
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