1、 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 1 of 3 NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECI
2、FICATION) NUMBER: CEMS BT-40 TITLE: Determination Of Equilibrium Boiling Range And High Boiling Impurities in Air Conditioner Refrigerant CURRENT ISSUE DATE: August 2009 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: October 2001 PRINTED COPIES OF
3、THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practic
4、es and to determine the applicability of regulatory limits prior to use. Change Notice: Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive. 1.0 SCOPE This is a method for determining the boiling range, defined by the boiling points at 5% and 85% evapo
5、ration, and the volume percentage of high boiling impurities in air conditioner refrigerant. (This method is adapted from “Methods of Analysis for Fluorocarbon Refrigerants,” Du Pont, Inc., Test Method B-8.) 2.0 APPARATUS 2.1 Thermometer, ASTM E-1, 62C or equivalent. 2.2 Centrifuge tube, De Laval 14
6、209. 2.3 Two constant temperature baths capable of maintaining 25 + 1C and 0 + 1C, respectively. 2.4 22 gage (0.6 mm) nichrome wire. 2.5 Barometer readable to 0.1 mm. 2.6 Timer capable of measuring 30 + 0.1 minutes. 3.0 PROCEDURE 3.1 Record the barometric pressure to + 0.1 mm. 3.2 Fill a De Laval ce
7、ntrifuge tube to the 100 milliliter mark with liquid sample. 3.3 Suspend the thermometer in the tube to the 15 milliliter mark and insert the nichrome wire alongside the thermometer. The wire should extend to the tip of the tube. See Figure, page 3. 3.4 Immerse the tube to the 0.05 milliliter mark i
8、n a constant temperature bath at 25 + 1C. 3.5 Observe and record the boiling temperature when the volume has diminished to the 95 milliliter mark (5% evaporation) and again at the 15 milliliter mark (85% evaporation). 3.6 Remove the tube and reimmerse to the 0.05 milliliter mark in a constant temper
9、ature bath at 0 + 1C. 3.7 Allow the remainder of the sample to evaporate for 30 + 0.1 minutes. Then read and record the volume of high boiling impurities remaining to + 0.001 milliliter. As evaporation approaches the 0.05 milliliter mark, remove the nichrome wire to facilitate reading of the impurit
10、ies. 4.0 CALCULATIONS 4.1 Calculate the boiling point and range at standard pressure (760 mm) for the 95 milliliter (5%) and 15 milliliter (85%) evaporation points by applying the suitable correction factor for different barometric pressures as shown in the table on page 2. NUMBER: CEMS BT-40 TITLE:
11、 Determination Of Equilibrium Boiling Range And High Boiling Impurities In Air Conditioner Refrigerant CURRENT ISSUE DATE: August 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to
12、 assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 2 of 3 CALCULATIONS (Continued) Barometric Pressure, mm Temperature Correction C Barometric Pressure, mm Temperature Correction C Barometric Pressure, mm Temperature Correction C 730 +0.50 750 -0.10 764 -0.55 731 +0.47 751 -0.13 7
13、66 -0.58 732 +0.44 752 -0.16 767 -0.61 733 +0.41 753 -0.19 768 -0.64 734 +0.38 754 -0.22 769 -0.67 735 +0.35 755 -0.25 770 -0.70 736 +0.32 756 -0.28 771 -0.73 737 +.029 757 -0.31 772 -0.76 738 +0.26 758 -0.34 773 -0.79 739 +0.23 759 -0.37 774 -0.82 740 +0.20 760 -0.40 775 -0.85 741 +0.17 761 -0.43 7
14、76 -0.88 742 +0.14 762 -0.46 777 -0.91 743 +0.11 763 -0.49 778 -0.94 744 +0.08 764 -0.52 779 -0.97 745 +0.05 746 +0.02 747 -0.01 748 -0.04 749 -0.07 4.2 Calculate the percentage by volume of high boiling impurities as follows: Percent high boiling impurities = where: R = volume of residue remaining
15、in test tube at the conclusion of step (3.7) of the procedure, ml S = initial volume of sample used, ml 5.0 REPORT 5.1 Report the corrected equilibrium boiling temperatures and range for the 5% and 85% evaporated volume points in degrees centigrade. 5.2 Report the percentage by volume of high boilin
16、g impurities. NUMBER: CEMS BT-40 TITLE: Determination Of Equilibrium Boiling Range And High Boiling Impurities In Air Conditioner Refrigerant CURRENT ISSUE DATE: August 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 3 of 3
