1、Designation: D97 17aD97 17bDesignation: 15/95Standard Test Method forPour Point of Petroleum Products1This standard is issued under the fixed designation D97; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revisio
2、n.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This test method covers and is intended for use
3、 on any petroleum product.2 A procedure suitable for black specimens,cylinder stock, and nondistillate fuel oil is described in 8.8. The cloud point procedure formerly part of this test method nowappears as Test Method D2500.1.2 Currently there is no ASTM test method for automated Test Method D97 po
4、ur point measurements.1.3 Several ASTM test methods offering alternative procedures for determining pour points using automatic apparatus areavailable. None of them share the same designation number asTest Method D97.When an automatic instrument is used, theASTMtest method designation number specifi
5、c to the technique shall be reported with the results. A procedure for testing the pour pointof crude oils is described in Test Method D5853.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 WARNINGMercury has been desig
6、nated by many regulatory agencies as a hazardous material that can cause centralnervous system, kidney and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Cautionshould be taken when handling mercury and mercury containing products. See the applicable prod
7、uct Material Safety Data Sheet(MSDS) for details and EPAs websitehttp:/www.epa.gov/mercury/faq.htmfor additional information. Users should be awarethat selling mercury and/or mercury containing products into your state or country may be prohibited by law.1.6 This standard does not purport to address
8、 all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.7 This international standard was developed in accordance wi
9、th internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:
10、3D117 Guide for Sampling, Test Methods, and Specifications for Electrical Insulating Oils of Petroleum OriginD396 Specification for Fuel OilsD2500 Test Method for Cloud Point of Petroleum Products and Liquid FuelsD5853 Test Method for Pour Point of Crude OilsD6300 Practice for Determination of Preci
11、sion and Bias Data for Use in Test Methods for Petroleum Products and LubricantsD7962 Practice for Determination of Minimum Immersion Depth and Assessment of Temperature Sensor Measurement DriftE1 Specification for ASTM Liquid-in-Glass ThermometersE644 Test Methods for Testing Industrial Resistance
12、Thermometers1 This test method is under the jurisdiction ofASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of SubcommitteeD02.07 on Flow Properties.Current edition approved May 15, 2017Dec. 15, 2017. Published May 2017January 2018. Originally a
13、pproved in 1927, replacing D47. Last previous edition approvedin 2017 as D97 17.D97 17a. DOI: 10.1520/D0097-17A.10.1520/D0097-17B.In the IP, this test method is under the jurisdiction of the Standardization Committee. This test method was adopted as a joint ASTM-IP Standard in 1965.2 Statements defi
14、ning this test and its significance when applied to electrical insulating oils of mineral origin will be found in Guide D117.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, r
15、efer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all
16、changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100
17、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1E1137 Specification for Industrial Platinum Resistance ThermometersE2877 Guide for Digital Contact Thermometers2.2 Energy Institute Standards:4Specifications for IP Standard Thermometers3. Terminology3.1 Definitions:3.1
18、.1 black oil, nlubricant containing asphaltic materials. Black oils are used in heavy-duty equipment applications, such asmining and quarrying, where extra adhesiveness is desired.3.1.2 cylinder stock, nlubricant for independently lubricated engine cylinders, such as those of steam engines and airco
19、mpressors. Cylinder stock are also used for lubrication of valves and other elements in the cylinder area.3.1.3 digital contact thermometer (DCT), nan electronic device consisting of a digital display and associated temperaturesensing probe.3.1.3.1 DiscussionThis device consists of a temperature sen
20、sor connected to a measuring instrument; this instrument measures the temperature-dependent quantity of the sensor, computes the temperature from the measured quantity, and provides a digital output. This digitaloutput goes to a digital display and/or recording device that may be internal or externa
21、l to the device. These devices are sometimesreferred to as “digital thermometers.”3.1.3.2 DiscussionPET is an acronym for portable electronic thermometers, a subset of digital contact thermometers (DCT).3.1.4 pour point, nin petroleum products, the lowest temperature at which movement of the test sp
22、ecimen is observed underprescribed conditions of test.3.1.5 residual fuel, na liquid fuel containing bottoms remaining from crude distillation or thermal cracking; sometimesreferred to as heavy fuel oil.3.1.5.1 DiscussionResidual fuels comprise Grades 4, 5, and 6 fuel oils, as defined in Specificati
23、on D396.4. Summary of Test Method4.1 After preliminary heating, the sample is cooled at a specified rate and examined at intervals of 3 C for flow characteristics.The lowest temperature at which movement of the specimen is observed is recorded as the pour point.5. Significance and Use5.1 The pour po
24、int of a petroleum specimen is an index of the lowest temperature of its utility for certain applications.6. Apparatus6.1 Test Jar, cylindrical, of clear glass, flat bottom, 33.2 mm to 34.8 mm outside diameter, and 115 mm to 125 mm in height.The inside diameter of the jar can range from 30.0 mm to 3
25、2.4 mm, within the constraint that the wall thickness be no greater than1.6 mm. The jar shall have a line to indicate a sample height 54 mm 6 3 mm above the inside bottom. See Fig. 1.6.2 Temperature Measuring DeviceEither liquid-in-glass thermometer as described in 6.2.1 or Digital Contact Thermomet
26、er(DCT) meeting the requirements described in 6.2.2.56.2.1 Liquid-in-Glass Thermometers, having the following ranges and conforming to the requirements prescribed inSpecification E1 or Specifications for IP Standard Thermometers:Temperature ThermometerNumberThermometer Range ASTM IPHigh cloud and po
27、ur 38 C to +50 C 5C 1CLow cloud and pour 80 C to +20 C 6C 2CMelting point +32 C to +127 C 61C 63C4 Available from Energy Institute, 61 New Cavendish St., London, W1G 7AR, U.K., http:/www.energyinst.org.5 Supporting data have been filed at ASTM International Headquarters and may be obtained by reques
28、ting Research Report RR:D02-1826. Contact ASTM CustomerService at serviceastm.org.D97 17b26.2.1.1 Since separation of liquid column thermometers occasionally occurs and may escape detection, thermometers should bechecked immediately prior to the test and used only if they prove accurate within 61 C
29、(for example ice point).6.2.2 Digital Contact Thermometer Requirements:Parameter RequirementDCT Guide E2877 Class G or betterDCT Guide E2877 Class F or betterTemperature range 65 C to 90 CNominal temperature rangeA High Pour: 38 C to 50 CLow Pour: 80 C to 20 CMelt Point: 32 C to 127 CDisplay resolut
30、ion 0.1 C minimumDisplay resolution 1 C minimum, preferably 0.1 CAccuracyB 500 mK (0.5 C)Sensor type PRT, thermistor, thermocoupleSensor type Platinum resistance thermometer (PRT), thermistor, thermocoupleSensor 3 mm OD sheath with a sensing element less than 10 mm in lengthSensor sheathC 4.2 mm OD
31、maximumSensor lengthD Less than 10 mmMinimum immersion Less than 40 mm per Test Method D7962Immersion depthE Less than 40 mm per Practice D7962Sample immersion depth Between 10 mm and 15 mmin the sample.Fig. 1Sample immersion depth Tip of sheath between 10 mm and 15 mmbelow sample meniscusFig. 1Disp
32、lay accuracy 500 mK (0.5 C) for combined probe and sensorMeasurement driftE Less than 500 mK (0.5 C) per yearNOTE 1Dimensions are in millimetres (not to scale).FIG. 1 Apparatus for Pour Point TestD97 17b3Response time less than or equal to 25 s as defined inSpecification E1137Response timeF Less tha
33、n or equal to 4 s per footnote FDrift less than 500 mK (0.5 C) per yearCalibration error less than 500 mK (0.5 C) over the range of intended use.Calibration error Less than 500 mK (0.5 C) over the range of intended useCalibration range 40 C or lower to 85 CCalibration range Consistent with temperatu
34、re range of useCalibration data 4 data points evenly distributed over calibration range with data included in calibration report.Calibration data Four data points evenly distributed over the calibration range that is consistent with the range ofuse. The calibration data is to be included in the cali
35、bration report.Calibration report From a calibration laboratory with demonstrated competency in temperature calibration which istraceable to a national calibration laboratory or metrology standards bodyA The nominal temperature range may be different from the values shown provided the calibration an
36、d accuracy criteria are met.B Accuracy is the combined accuracy of the DCT unit, which is the display and sensor.C Sensor sheath is the tube that holds the sensing element. The value is the outside diameter of the sheath segment containing the sensor element.D The physical length of the temperature
37、sensing element.E As determined by Practice D7962 or an equivalent procedure.F Response TimeThe time for a DCT to respond to a step change in temperature. The response time is 63.2 % of the step change time as determined per Section 9of Test Methods E644. The step change evaluation begins at 20 C 5
38、C air to 77 C 5 C with water circulating at 0.9 m s 0.09 m s past the sensor.NOTE 1When making measurements below 40 C with a PRT, it may be necessary to use a 1000sensor in order to obtain accurate measurements.NOTE 2When the DCT display is mounted on the end to the probes sheath, the test jar with
39、 the probe inserted will be unstable. To resolve this, itis recommended that the probe be less than 30 cm in length but no less than 15 cm. A 5 cm long stopper, that has a low thermal conductivity, withapproximately half of it inserted in the sample tube will improve stability.6.2.2.1 The DCT calibr
40、ation drift shall be checked at least annually by either measuring the ice point or against a referencethermometer in a constant temperature bath at the prescribed immersion depth to ensure compliance with 6.2.2. See Test MethodPractice D7962.NOTE 3When a DCTs calibration drifts in one direction ove
41、r several calibration checks, that is, ice point, it may be an indication of deteriorationof the DCT.6.3 Cork, to fit the test jar, bored centrally for the test temperature measuring device.6.4 Jacket, watertight, cylindrical, metal, flat-bottomed, 115 mm 6 3 mm depth, with inside diameter of 44.2 m
42、m to 45.8 mm.It shall be supported in a vertical position in the cooling bath (see 6.7) so that not more than 25 mm projects out of the coolingmedium, and shall be capable of being cleaned.6.5 Disk, cork or felt, 6 mm thick to fit loosely inside the jacket.6.6 Gasket Ring Form, about 5 mm in thickne
43、ss, to fit snugly around the outside of the test jar and loosely inside the jacket.The gasket may be made of rubber, leather, or other material that is elastic enough to cling to the test jar and hard enough to holdits shape. Its purpose is to prevent the test jar from touching the jacket.6.7 Bath o
44、r Baths, maintained at prescribed temperatures with a firm support to hold the jacket vertical. The required bathtemperatures may be obtained by refrigeration if available, otherwise by suitable cooling mixtures. Cooling mixtures commonlyused for bath temperatures down to those shown are in Table 1.
45、7. Reagents and Materials7.1 The following solvents of technical grade are appropriate for low-temperature bath media.7.1.1 Acetone, (WarningExtremely flammable).7.1.2 Alcohol, Ethanol (WarningFlammable).7.1.3 Alcohol, Methanol (WarningFlammable. Vapor harmful).7.1.4 Petroleum Naphtha, (WarningCombu
46、stible. Vapor harmful).7.1.5 Solid Carbon Dioxide, (WarningExtremely cold 78.5 C).8. Procedure8.1 Pour the specimen into the test jar to the level mark. When necessary, heat the specimen in a bath until it is just sufficientlyfluid to pour into the test jar.NOTE 4It is known that some materials, whe
47、n heated to a temperature higher than 45 C during the preceding 24 h, do not yield the same pour pointresults as when they are kept at room temperature for 24 h prior to testing. Examples of materials which are known to show sensitivity to thermal historyare residual fuels, black oils, and cylinder
48、stocks.D97 17b48.1.1 Samples of residual fuels, black oils, and cylinder stocks which have been heated to a temperature higher than 45 Cduring the preceding 24 h, or when the thermal history of these sample types is not known, shall be kept at room temperature for24 h before testing. Samples which a
49、re known by the operator not to be sensitive to thermal history need not be kept at roomtemperature for 24 h before testing.8.1.2 Experimental evidence supporting elimination of the 24 h waiting period for some sample types is contained in a researchreport.68.2 In the case of pour points above 36 C, use a higher range temperature measuring device (6.2) such as IP 63C or ASTM61C, or a digital contact thermometer. Close the test jar with the cork carrying the test temperature measuring device
