1、Designation: D1120 16D1120 17Standard Test Method forBoiling Point of Engine Coolants1This standard is issued under the fixed designation D1120; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in
2、 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 U.S. Department of Defense.1. Scope*1.1 This test method covers the determination of the equilibr
3、ium boiling point of engine coolants. The equilibrium boiling pointindicates the temperature at which the sample will start to boil in a cooling system under equilibrium conditions at atmosphericpressure.NOTE 1Engine coolants may also be marketed in a ready-to-use form (prediluted). This test proced
4、ure is applicable to diluted solutions as well asto concentrates.NOTE 2The procedure for obtaining a representative test sample of a coolant solution that contains an antileak additive is found in Practice D1176.1.2 The values stated in SI units are to be regarded as standard. The values given in pa
5、rentheses are for information only.1.3 This standard does not purport to address 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 regulatorylimitat
6、ions prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Techni
7、cal Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing PurposesE1 Specification for ASTM Liquid-in-Glass ThermometersE230/E230M Specification and Temperature-Electromotiv
8、e Force (emf) Tables for Standardized Thermocouples3. Summary of Test Method3.1 Sixty millilitres (two ounces) of the sample are boiled under equilibrium conditions at atmospheric pressure in a 100-mLflask. The temperature of the liquid corrected for barometric pressure is the boiling point.4. Appar
9、atus (see Fig. 1)4.1 FlaskA 100-mL round-bottom, short-neck, heat-resistant glass flask having a neck with a 1938 standard-taper, femaleground-glass joint and a 10-mm (0.4-in) outside diameter side-entering tube, so located as to permit the end of the thermometerdevice to be directly centered in the
10、 flask approximately 6.5 mm (0.26 in.) from the bottom. The flask is shown in Fig. 2.4.2 CondenserThe condenser shall be of the water-cooled, reflux, glass-tube type, having a condenser jacket 200 mm (7.9 in.)in length. The bottom end of the condenser shall have a 1938 standard-taper, drip-tip, male
11、 ground-glass joint.4.3 Boiling StonesThree or four silicon carbide grains, grit No. 8 or other suitable inert chips, shall be used for eachdetermination. For samples exhibiting heavy foam, more boiling chips may be added.4.4 Temperature Measuring Instrument (Environmentally Safe Thermometer or Ther
12、mocouple)An ASTM Partial ImmersionThermometer, having a range from 5from 5 to 300C300 C (20 to 580F)580 F) and conforming to the requirements for1 This test method is under the jurisdiction of ASTM Committee D15 on Engine Coolants and Related Fluids and is the direct responsibility of Subcommittee D
13、15.03 onPhysical Properties.Current edition approved April 1, 2016April 1, 2017. Published April 2016April 2017. Originally approved in 1950 as D1120 50 T. Last previous edition approved in20112016 as D1120 11D11201.-16. DOI: 10.1520/D1120-16.10.1520/D1120-17.2 For referencedASTM standards, visit th
14、eASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standardsstandards 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 st
15、andard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by A
16、STM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Thermometer 2C or 2F, as prescribed in Specification E1, or some other suit
17、able non-mercury containing temperature measuringdevice, such as a thermocouple, capable of operating in the same temperature range and having equal or better accuracy assummarized in Specification E230/E230M. See Section 10, Precision and Bias.4.5 Heat SourceA suitable electric heating mantle shall
18、 be used, such that sufficient heat can be obtained to comply with theheating and refluxing rates specified in Section 7.FIG. 1 Boiling Point Test ApparatusFIG. 2 Short-Neck Flask, 100 mLD1120 1725. Sample5.1 To obtain a sample of unused concentrated coolant for boiling point determination, the foll
19、owing procedure is suggested:5.1.1 Allow material as received in the original container to come to room temperature 20C (68F)20 C (68 F) but not below20C20 C minimum).5.1.2 Shake the container to mix any material that may have separated.5.1.3 Immediately remove desired sample for test requirement.5.
20、2 To prepare a dilute solution of any mixture, thoroughly mix the sample, pipet the required volume into a calibratedvolumetric flask, and add distilled water to bring the mixed contents of the flask to the proper volume while maintaining thecalibration temperature.5.3 The procedure for obtaining a
21、representative test sample of a coolant solution that contains an antileak additive is found inPractice D1176.6. Preparation of Apparatus6.1 Use a calibrated temperature measuring instrument (thermometer or thermocouple).6.2 Insert the calibrated temperature measuring instrument through the side tub
22、e until the tip of the bulb is approximately 6.5mm (0.26 in.) from the bottom of the center of the flask. Make a seal around the temperature measuring instrument with a shortpiece of rubber tubing or other suitable material.6.3 Place 60 mL (2 oz) of the sample to be tested, together with three or fo
23、ur silicon carbide grains, into the flask.6.4 Attach the chemically cleaned condenser to the flask and mount the flask in an appropriate heating mantle. Support theglassware by a laboratory-type ring support and stand. The whole assembly is held in place by a clamp. Connect the cooling waterinlet an
24、d outlet tubes to the condenser.7. Procedure7.1 When assembled as shown in Fig. 1, turn on the condenser water and apply heat by means of an electric heater at such arate that the sample is brought to its boiling point within 15 min. Heat strongly until boiling is reached and then reduce heat inputs
25、lowly until the required reflux rate is obtained. Adjust the rate of reflux over the next 10-min period to 1 to 2 drops of reflux persecond. To obtain accurate results, it is important to carefully observe the specified reflux rate and maintain the proper reflux ratefor 2 min before reading the temp
26、erature.7.2 Record the observed temperature and the barometric pressure.8. Calculation8.1 Temperature Measuring Instrument InaccuracyCorrect the observed temperature by applying the correction factorobtained in calibrating the thermometer or thermocouple for inaccuracy (6.1).8.2 Variation from Stand
27、ard Barometric PressureThis correction shall be applied to the observed temperature after correctionfor inaccuracy of the thermometer. Use Table 1 to determine the barometric correction.9. Report9.1 Report the following information:9.1.1 The equilibrium boiling point as the observed temperature roun
28、ded off to the nearest 0.3C (0.5F), corrected forthermometer or thermocouple inaccuracy and barometric pressure.D1120 1739. Report9.1 Report the following information:9.1.1 The equilibrium boiling point as the observed temperature rounded off to the nearest 0.3 C (0.5 F), corrected forthermometer or
29、 thermocouple inaccuracy and barometric pressure.10. Precision and Bias10.1 Precision:NOTE 3Previous versions of this test method permitted the use of mercury-containing thermometers. The data for the Precision and Bias statementwere generated under earlier versions of the test method, and were gene
30、rated with mercury-filled thermometers.10.1.1 ReproducibilityFor diluted samples boiling below 100C (212F),100 C (212 F), results should not differ from eachother by more than 1.4C (2.5F)1.4 C (2.5 F) and, for samples boiling above 100C (212F),100 C (212 F), results should notdiffer from each other
31、by more than 2.5C (4.5F).2.5 C (4.5 F).10.1.2 For unused concentrated samples boiling below 100C (212F),100 C (212 F), results should not differ from each otherby more than 1.4C (2.5F),1.4 C (2.5 F), and for samples boiling above 100C (212F),100 C (212 F), results should not differby more than 5.6C
32、(10F).10.2 BiasSince there is no accepted reference material suitable for determining the bias for the procedure in this test method,bias has not been determined.11. Keywords11.1 boiling point; engine coolantTABLE 1 Corrections for Barometric PressureAObserved TemperatureCorrected for TemperatureMea
33、suring InstrumentInaccuracyCorrection per 1-mm HgDifference in PressureBC FUnder 100C (212F) 0.03 0.06100C (212F) to 190C (374F) 0.04 0.07Over 190C (374F) 0.04 0.08TABLE 1 Corrections for Barometric PressureAObserved TemperatureCorrected for TemperatureMeasuring InstrumentInaccuracyCorrection per 1-
34、mm HgDifference in PressureBC FUnder 100 C (212 F) 0.03 0.06100 C (212 F) to 190 C (374 F) 0.04 0.07Over 190 C (374 F) 0.04 0.08A This table is an approximation based on the Sydney Young equation, as follows:Cc = 0.000095 (760 P) (273 tc)where:Cc = correction to be added to the observed temperature,
35、 tc, andP = actual barometric pressure in millimetres of mercury.The corresponding equation for the correction of a Fahrenheit temperaturemeasuring instrument is as follows:Cf = 0.000095 (760 P) (460 tf) where:Cf = correction to be added to the observed temperature, tf .B To be added in case baromet
36、ric pressure is below 760 mm; to be subtracted incase barometric pressure is above 760 mm.D1120 174SUMMARY OF CHANGESSubcommittee D15.03 has identified the location of selected changes to this standard since the last issue(D1120-11)-16) that may impact the use of this standard.(1) Removed4.1 last se
37、ntence ofpreviously read “.to 4.4.be directly centered in the flask 6.5 mm from the bottom.” It is impossibleto measure distance of the end of the thermometer to the bottom. It is done by naked eye and an approximate value is much moreconsistent with the laboratory reality.(2) Added6.2 Note 3.is tre
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