SH/T 0089-1991 Determination of boiling point of engine coolants

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Card type: Test method

1. Method number / full title / English name / replacement relationship

• Standard number: SH/T 0089-91
• Chinese title: Determination of boiling point of engine coolants
• English title: not provided in the available source
• Replacement relationship: not provided in the available source (the source notes "(2001) confirmed in year")
• Reference adoption: ASTM D1120-89 "Determination of boiling point of engine coolants" (see additional notes)

2. Scope of application and non-applicability

• This standard specifies a method for determining the equilibrium boiling point of engine coolants.
• This standard applies to diluted or concentrated engine coolants.
• Not applicable: not provided in the available source.

3. Method principle

Take a 60 mL test sample and place it into a 100 mL flask, heat to boiling under normal pressure, and when gas-liquid equilibrium is reached, read the temperature of the test sample; after correction for atmospheric pressure difference, this is the boiling point of the test sample.

4. Reagents and materials (purity / preparation)

• Boiling stones: silicon carbide particles or other suitable inert material fragments (4.2).
• Other reagents: not provided in the available source.

5. Apparatus and equipment

• 4.1.1 Flask: 100 mL, see Figure 1 (figure omitted in the source).
• 4.1.2 Reflux condenser: length 200 mm.
• 4.1.3 Thermometer: complies with GB/T 514 thermometer No. 3 for dropping point.
• 4.1.4 Heating device: blowtorch or electric heater. The heating intensity must satisfy the heating rate and reflux rate required in clause 6.1.
• The boiling point test apparatus is shown in Figure 2 (figure omitted in the source); the figure labels: 1— water outlet; 2— condenser; 3— thermometer; 4— flask; 5— boiling stones; 6— asbestos metal gauze; 7— water inlet.

6. Recommended operating conditions

• Heating rate: make the test sample reach boiling within 10 min (6.1).
• Reflux rate: after boiling, slowly reduce the heating intensity so that within 10 min the reflux rate reaches 1～2 drops per second (6.1).
• Timing of reading: after maintaining the specified reflux rate for 2 min, then read the temperature (6.1).
• Thermometer insertion depth: the mercury bulb is 6.5 mm from the center of the flask bottom (5.2.2).
• Sample amount: 60 mL (5.2.3).
• Amount of boiling stones: three or four pieces (5.2.3).

7. Sampling and test sample preparation

• 5.1.1 Preparation of concentrated sample: carry out in accordance with SH/T 0065.
• 5.1.2 Preparation of diluted sample: carry out in accordance with SH/T 0065.
• 5.2.3 Measure 60 mL of diluted test sample or unused concentrated test sample and pour it into the flask, then add three or four pieces of boiling stones.

8. Analytical procedure

• 5.2.1 When conducting the test, a calibrated thermometer must be used.
• 5.2.2 Insert the calibrated thermometer into the side neck of the flask, with the insertion depth based on the mercury bulb being 6.5 mm from the center of the flask bottom. The thermometer and the side neck of the flask may be fitted with a short piece of rubber tubing to form a seal and avoid air leakage.
• 5.2.3 Measure 60 mL of diluted test sample or unused concentrated test sample and pour it into the flask, then add three or four pieces of boiling stones.
• 5.2.4 Insert the clean, dry condenser into the flask, and place them on a blowtorch or electric heater padded with asbestos gauze; fix the upper part of the condenser to an iron stand with a clamp, connect latex tubing to the inlet and outlet of the condenser respectively, and fill the condenser jacket with water.
• 6.1 After all preparatory work is completed, heating may begin. Adjust the heating rate so that the test sample reaches boiling within 10 min. After boiling, slowly reduce the heating intensity so that within 10 min the reflux rate reaches 1～2 drops per second. Observe the reflux rate carefully; after maintaining the specified reflux rate for 2 min, then read the temperature.
• 6.2 Record the observed temperature and the atmospheric pressure during the test.

9. Qualitative and quantitative determination and calculation formulas

• 7.1 Correction of thermometer reading: correct the thermometer reading according to the previously measured correction coefficient.
• 7.2 Correction of temperature for atmospheric pressure difference: after correcting the thermometer reading, then correct the observed temperature for atmospheric pressure difference; Table 1 may be used to determine the atmospheric pressure difference correction coefficient or the calculation may be made directly according to the formula.

Table 1 Atmospheric pressure difference correction coefficient

Note: If the actual atmospheric pressure during the test is lower than standard atmospheric pressure, the boiling point of the test sample is obtained by adding the correction value obtained by multiplying the atmospheric pressure difference by the coefficient in the table to the observed temperature value after correction of the thermometer reading; if the actual atmospheric pressure is higher than standard atmospheric pressure, subtract the obtained correction value.

• The atmospheric pressure difference temperature correction value for the boiling point of the test sample C (℃) may also be calculated according to the following formula:

C = 0.0007126 (101.3 − P) (273 + t)

Where:

• P—— actual atmospheric pressure during the test, kPa;

• t—— observed temperature after correction of the thermometer reading, ℃.

• Reported value: after the observed temperature is corrected for thermometer reading and atmospheric pressure difference, it is taken as the equilibrium boiling point of the test sample, and the result is reported to 0.5℃ (Chapter 9).

10. Precision

Reproducibility: the difference between two results submitted by different laboratories shall not be greater than the value listed in Table 2.

Table 2 Reproducibility

Note: The numerical area source-text extraction of Table 2 in the source was extracted as garbled text such as ";，:" "1 . t 5 5. 5", which cannot be reliably restored; the specific values require confirmation against the source standard (source-text extraction).

11. Report

After the observed temperature is corrected for thermometer reading and atmospheric pressure difference, it is taken as the equilibrium boiling point of the test sample, and the result is reported to 0.5℃.

12. Referenced documents

• GB/T 514 Technical conditions for liquid thermometers for petroleum product testing
• SH/T 0065 Sampling of test samples of engine coolants or rust inhibitors and preparation of their aqueous solutions

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick reference Q&A