SH/T 0073-1991 Determination of Jet Fuel Anti-Wear Index (Ring-on-Block Method)

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

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

• Standard number: SH/T 0073-91
• Chinese title: Determination of Jet Fuel Anti-Wear Index (Ring-on-Block Method)
• English title: not provided in the available source
• Replacement relationship: not provided in the available source (only an "Editor's note" is seen stating that the referenced standard GB 11144 has its current standard number changed to SH/T 11144, which is not a replacement relationship of this standard itself)
• Approval/implementation: approved by China Petrochemical Corporation 1991-06-28, implemented on 1992-07-01

2. Scope of application and non-applicability

• Scope of application: This standard specifies the method for determining the anti-wear index of jet fuel by the ring-on-block method; it is applicable to the determination of the lubricity of jet fuel.
• Non-applicability: not provided in the available source.

3. Method principle

Under standard test conditions, the test oil serves as the lubricating medium, the test ring and test block are in a sliding friction state, and a wear scar width is produced on the test block; the ratio of this to the wear scar width produced on the test block under the same test conditions when the standard sample xylene serves as the lubricating medium is used to calculate the anti-wear index of the test oil, expressed as a Km value.

4. Reagents and materials (purity / preparation)

• 6.1 Xylene: analytical reagent.
• 6.2 Petroleum ether: boiling range 60～90℃, analytical reagent, or a solvent naphtha meeting the N-90 requirement in GB 1922.
• 6.3 Anhydrous ethanol: analytical reagent.
• 5.2.1 Test ring: refer to GB 11144, material GCr15 or GCrNi2MoA (source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction)).
• 5.2.2 Test block: refer to GB 11144, material GCr15 or GCrNi2MoA (source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction)).
• 5.2.3 Absorbent cotton.
• 5.2.4 Industrial filter paper.

5. Instruments and equipment

• 5.1 a. Ring-on-block wear testing machine.
• 5.1 b. Bench projector: model JLT-1, precision 0.01 mm (source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction)).
• 5.1 c. Oil cup: 1000 mL lower-outlet bottle 2 pieces, the lower outlet connected with an oil-resistant rubber tube to a glass two-way stopcock, as shown in Figure 1 (capacity unit source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction)).
• 5.1 d. Stopwatch.
• 5.1 e. Tweezers.
• 5.1 f. Special hook wrench.

6. Recommended operating conditions

• Laboratory temperature: 10～40℃
• Test time: 10 min
• Load: 10 N (original text "ION", source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction))
• Rotation speed: 200 r/min
• Test oil flow rate: 40 mL/min, continuous oil supply (original text "40niUmin", source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction))

7. Sampling and sample preparation

• 7.3.1 Filter the test oil with industrial filter paper into a clean bottle.
• 7.3.2 Let the test oil and xylene stand separately under the same environmental conditions for 24 h.
• 7.2.1 Clean the ring, block and parts contacting the test oil three times each with petroleum ether, and air-dry (if they have contacted anti-wear agent, clean twice with anhydrous ethanol, then twice with petroleum ether).
• 7.2.2 Clean the oil cup: wash twice with petroleum ether, then twice with test oil (if it has contained test oil with anti-wear agent, wash twice with anhydrous ethanol).

8. Analysis procedure

• 7.1 Adjust the testing machine: 7.1.1 debug according to the testing machine instruction manual; 7.1.2 start the testing machine and run it idle for 3～5 min, observing whether there is any abnormal phenomenon.
• 7.4 Install the test ring and test block: 7.4.1 install the test ring on the spindle, and use the special hook wrench to tighten the left-hand threaded nut counterclockwise (do not tighten too much, to prevent deformation of the test ring); 7.4.2 install the test block in the test block holder, tap the wedge tight, and check whether the bottom surface of the test block is in good contact.
• 7.5 Assemble the lever: 7.5.1 install the circular knife bearing, friction force rod, test force rod and the test block holder with the test block installed on the spindle, so that the test block holder baffle is exactly mounted on the copper sliding sleeve at the spindle end (as shown in Figure 2); 7.5.2 place the oil cup containing test oil on the oil cup seat on the machine body, open the two-way stopcock at the lower end of the oil cup, and pour a little test oil onto the surfaces of the test ring and test block; 7.5.3 use the special hook wrench to gently turn the spindle clockwise, and the level bubble at the left end of the friction force rod should stabilize at the center position; 7.5.4 hang the test force rod loaded with 10 N weights in the V-shaped groove at the left end of the friction force rod (original text "ION method weight", source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction)).
• 8.2.1 Calibration test (determination of the wear scar of the standard sample xylene):
  • 8.2.1.1 Inject xylene into the oil cup.
  • 8.2.1.2 Open the two-way stopcock at the lower end of the oil cup, control xylene to continuously drip onto the test ring at a flow rate of about 40 mL/min, and flow onto the friction surface between the test ring and test block (as shown in Figure 3).
  • 8.2.1.3 Start the testing machine, the spindle reaches 200 r/min within 10～20 s, stabilizes for 15 s, start the loading device, begin timing, and test the test ring and test block under sliding friction for 10 min, obtaining the first wear scar of xylene on the test block (b standard 1).
  • 8.2.1.4 Disassemble the lever and test block holder, and clean the test ring, block and parts according to 7.2.1.
  • 8.2.1.5 Install the test block according to 7.4.2.
  • 8.2.1.6 Assemble the lever according to clause 7.5.
  • 8.2.1.7 Follow the operating steps of 8.2.1.2 and 8.2.1.3 to obtain the second wear scar of xylene on the test block (b standard 2).
• 8.2.2 Determination of the wear scar of the test oil:
  • 8.2.2.1 Clean the test ring, test block and parts according to 7.2.1.
  • 8.2.2.2 Install the test block according to 7.4.2.
  • 8.2.2.3 Assemble the lever according to clause 7.5.
  • 8.2.2.4 Inject the test oil into the oil cup.
  • 8.2.2.5 Open the two-way stopcock at the lower end of the oil cup, control the test oil to continuously drip onto the test ring at a flow rate of about 40 mL/min, and flow onto the friction surface between the test ring and test block.
  • 8.2.2.6 Operate according to 8.2.1.3 to obtain the first wear scar produced by the test oil on the test block (b test 1).
  • 8.2.2.7 Disassemble the lever and test block holder, and clean the test ring, test block and parts according to 7.2.1.
  • 8.2.2.8 Install the test block according to 7.4.2.
  • 8.2.2.9 Assemble the lever according to clause 7.5.
  • 8.2.2.10 Follow the operating steps of 8.2.2.5 and 8.2.2.6 to obtain the second wear scar produced by the test oil on the test block (b test 2).
• 8.3 Determination of wear scar width: on the bench projector, measure the wear scar widths of xylene and the test oil. If any of the following situations occurs, that test run is rejected and the test ring and test block must be replaced for a new test:
  • a. The wear scar is an uneven rectangle;
  • b. The difference between b standard 1 and b standard 2 is greater than 0.05 mm;
  • c. The difference between b test 1 and b test 2 is greater than 0.05 mm.

9. Qualitative and quantitative determination and calculation formula

• 3.1 Definition of anti-wear index: when the standard sample and the test oil are subjected to a comparative test on the same testing machine, with the same test specimens and under the same test conditions, the wear scar width of the standard sample (b standard) is taken as the numerator and the wear scar width of the test oil (b test) as the denominator, and the ratio multiplied by 100 is defined as the anti-wear index, expressed as Km. The larger Km is, the better the lubricity of the test oil; the smaller Km is, the poorer the lubricity of the test oil.
• 3.2 b standard: with xylene as the lubricating medium, the wear scar width produced on the test block is expressed as b standard.
• 3.3 b test: with the test oil as the lubricating medium, the wear scar width produced on the test block is expressed as b test.
• 9.1 b standard is calculated according to formula (1): b standard = (b standard 1 + b standard 2) / 2; where b standard 1 is the first wear scar width of xylene (mm), and b standard 2 is the second wear scar width of xylene (mm).
• 9.2 b test is calculated according to formula (2): b test = (b test 1 + b test 2) / 2; where b test 1 is the first wear scar width of the test oil (mm), and b test 2 is the second wear scar width of the test oil (mm).
• 9.3 Anti-wear index Km is calculated according to formula (3): Km = (b standard / b test) × 100; where b standard is the arithmetic mean of the two wear scar widths of xylene (mm), and b test is the arithmetic mean of the two wear scar widths of the test oil (mm).

10. Precision

Judge the reliability of the test results according to the following provisions (95% confidence level).

• 10.1 Repeatability: for the same operator, on the same testing machine, on the same test ring and test block, the difference between the two wear scar widths from continuous repeated determinations of xylene and the same test oil shall not be greater than 0.05 mm.
• 10.2 Reproducibility: the difference between two Km values obtained by different operators in different laboratories on the same sample shall not be greater than 14 (original text "140", source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction)).

11. Report

• 11.1 Record: see Appendix A for the record table.
• 11.2 Report the measured value of Km.
• Appendix A (supplementary document): original record for determination of jet fuel anti-wear index, including commissioning unit, commissioning date, test purpose, relative humidity, room temperature (℃), testing machine lever constant, serial number, sample, wear scar width (b, mm) (initial reading, final reading, difference, average value), remarks; postscript includes test date, test personnel, verification.

12. Reference documents

• GB 11144 Determination of extreme pressure properties of lubricating oils (Timken tester method) (editor's note: the current standard number is changed to SH/T 11144, and the current standard name is Determination of extreme pressure properties of lubricating oils (Timken tester method))
• GB 1922 Solvent naphtha

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 for questions and answers