ASTM D3701-2001(2012) Standard Test Method for Hydrogen Content of Aviation Turbine Fuels by Low Resolution Nuclear Magnetic Resonance Spectrometry《低分辨率核磁共振光谱法测定航空涡轮机燃料中氢含量的标准试验方法》.pdf
《ASTM D3701-2001(2012) Standard Test Method for Hydrogen Content of Aviation Turbine Fuels by Low Resolution Nuclear Magnetic Resonance Spectrometry《低分辨率核磁共振光谱法测定航空涡轮机燃料中氢含量的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D3701-2001(2012) Standard Test Method for Hydrogen Content of Aviation Turbine Fuels by Low Resolution Nuclear Magnetic Resonance Spectrometry《低分辨率核磁共振光谱法测定航空涡轮机燃料中氢含量的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D3701 01 (Reapproved 2012)Designation: 338/98Standard Test Method forHydrogen Content of Aviation Turbine Fuels by LowResolution Nuclear Magnetic Resonance Spectrometry1This standard is issued under the fixed designation D3701; the number immediately following the designation indicates
2、the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the D
3、epartment of Defense.1. Scope1.1 This test method covers the determination of the hydro-gen content of aviation turbine fuels.1.2 Use Test Methods D4808 for the determination ofhydrogen in other petroleum liquids.1.3 The values stated in SI units are to be regarded asstandard. The preferred units ar
4、e mass percent hydrogen.1.4 This standard does not purport to address all of thesafety concerns, 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 prio
5、r to use. For a specificwarning statement, see 6.1.2. Referenced Documents2.1 ASTM Standards:2D1322 Test Method for Smoke Point of Kerosine andAviation Turbine FuelD1740 Test Method for Luminometer Numbers of AviationTurbine Fuels3D4057 Practice for Manual Sampling of Petroleum andPetroleum Products
6、D4808 Test Methods for Hydrogen Content of Light Distil-lates, Middle Distillates, Gas Oils, and Residua by Low-Resolution Nuclear Magnetic Resonance Spectroscopy3. Summary of Test Method3.1 A sample of the material is compared in a continuouswave, low-resolution, nuclear magnetic resonance spectrom
7、-eter with a reference standard sample of a pure hydrocarbon.The results from the integrator on the instrument are used as ameans of comparing the theoretical hydrogen content of thestandard with that of the sample, the result being expressed asthe hydrogen content (percent mass basis) in the sample
8、.4. Significance and Use4.1 The combustion quality of aviation turbine fuel hastraditionally been controlled in specifications by such tests assmoke point (see Test Method D1322), smoke volatility index,aromatic content of luminometer number (see Test MethodD1740). Evidence is accumulating that a be
9、tter control of thequality may be obtained by limiting the minimum hydrogencontent of the fuel.4.2 Existing methods allow the hydrogen content to becalculated from other parameters or determined by combustiontechniques. The method specified provides a quick, simple, andmore precise alternative to th
10、ese methods.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.03 on Elemental Analysis.Current edition approved April 15, 2012. Published April 2012. Originallyapproved in 1978. Last previous edit
11、ion approved in 2006 as D370101(2006).DOI: 10.1520/D3701-01R12.2For 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
12、e.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Apparatus5.1 Nuclear Magnetic Resonance Spectrometer4A low-resolution continuous-wave
13、 instrument capable of measuring anuclear magnetic resonance of hydrogen atoms, and fitted with:5.1.1 Excitation and Detection Coil, of suitable dimensionsto contain the test cell.5.1.2 Electronic Unit, to control and monitor the magnet andcoil and containing:5.1.2.1 Circuits, to control and adjust
14、the radio frequencylevel and audio frequency gain.5.1.2.2 Integrating Counter, with variable time period inseconds.5.2 Conditioning BlockA block of aluminum alloy drilledwith holes of sufficient size to accommodate the test cells withthe mean height of the sample being at least 20 mm below thetop of
15、 the conditioning block (see Fig. 1).5.3 Test CellsNessler-type tubes of approximately100-mL capacity with a nominal external diameter of 34 mmand a nominal internal diameter of 31 mm marked at a distanceof approximately 51 mm above the bottom of the tube by a ringaround the circumference. The varia
16、tion between the internaldiameters of the test cells used for the sample and referencematerial should not be greater than 60.5 mm.NOTE 1To avoid potential difficulties with tightness when the test cellis introduced into the magnet coil, users are cautioned to avoid test cellsthat have nominal extern
17、al diameters that are greater than 34.2 mm.5.4 Polytetrafluoroethylene (PTFE) Plugs for Closing TestCellsPlugs as shown in Fig. 1 made from pure PTFE and atight fit in the test cells.5.5 Insertion RodA metal rod with a threaded end asshown in Fig. 1 for inserting and removing PTFE plugs fromtest cel
18、ls.5.6 Analytical BalanceTop pan type, capable of weighingthe test cells in an upright position to an accuracy of 60.01 g.6. Materials6.1 Reference StandardDodecane, 99 mass % minimumpurity (WarningFlammable).7. Sampling7.1 Take a homogenous sample in accordance with PracticeD4057.8. Preparation of
19、Apparatus8.1 Read the following instructions in conjunction with themanufacturers handbook. Preparation of the instrument is notcritical but take care to prevent rapid temperature fluctuationsof the instrument and the conditioning block, for example,avoid them from direct sunlight or from drafts.8.2
20、 The results obtained during the use of the equipment aresusceptible to error arising from changes in the magneticenvironment. Exercise care to ensure that there is a minimumof magnetic material in the immediate vicinity of the equip-ment and that this be kept constant throughout the course of aseri
21、es of determinations.8.3 Set the instrument controls to the following conditions:NOTE 2On new NMR instruments with variable gates the gate shouldbe set at 1.5 gauss to comply with nonvariable gate instruments.Radio frequency level 20 AAudio frequency gain 500 on dialIntegration time 128 s8.4 Switch
22、on the main supply to the spectrometer and allowit to warm up for at least 1 h.8.5 Place a test cell containing sample in the coil and adjustthe tuning of the instrument until the two resonance curves onthe oscilloscope are coincident. This setting may need to bereadjusted during determinations.8.6
23、Remove the test cell from the coil and observe that thesignal readout is now 0 6 3 digits. This should be checkedperiodically during the series of tests to ensure that nocontamination of the coil has occurred.4This test method has been written around the Newport Analyzer Mark IIIF(Oxford Analytical
24、Instruments, Ltd., Oxford, England) and the details of the testmethod should be read in conjunction with the manufacturers handbook.This particular instrument was the only instrument available when the precisionprogram was carried out. Any similar instrument would be accepted into the abovemethod pr
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD370120012012STANDARDTESTMETHODFORHYDROGENCONTENTOFAVIATIONTURBINEFUELSBYLOWRESOLUTIONNUCLEARMAGNETICRESONANCESPECTROMETRY

链接地址:http://www.mydoc123.com/p-515303.html