SH/T 0634-1996 Determination of filter plugging tendency of water-cooled two-stroke gasoline engine oils

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 0634-1996
• Chinese name: Determination of filter plugging tendency of water-cooled two-stroke gasoline engine oils
• English name: not provided in the available source
• Replacement relationship: not provided in the available source (the source only states "This standard is equivalent to the United States Marine Manufacturers Association (abbreviated as NMMA) TC-WII filter plugging test method")
• Adoption relationship: equivalent adoption of NMMA TC-WII filter plugging test method
• Responsible body: Sinopec Research Institute of Petroleum Processing
• Proposed by: Sinopec Maoming Petrochemical Company
• Drafted by: Research Institute of Sinopec Maoming Petrochemical Company
• Main drafters: Feng Xinping, Deng Yibiao, Hua Xianjun, Zhang Mang
• Approval/implementation: approved by 1996-05-24, implemented by 1996-12-01

2. Scope of application and non-applicability

• Scope of application: This standard specifies a method for determining the tendency of precipitates or gels, produced when water-cooled two-stroke gasoline engine oils are contaminated with engine oil containing organometallic compounds and a small amount of water is present, to plug filters. This standard applies to water-cooled two-stroke gasoline engine oils.
• Main use: mainly used as part of the NMMA TC-WII oil program evaluation.
• Not applicable: not provided in the available source.

3. Method principle

When an oil produces gel or precipitate, its filtration rate will be slowed. By comparing the filtration rate of an oil to which reference oil has been added in proportion, without water and after adding water, the tendency of the oil to plug the oil filter can be judged.

4. Reagents and materials (purity / preparation)

• 3.2.1 Plastic tube: inner diameter 8 mm
• 3.2.2 Silicone rubber tube: inner diameter 3 mm
• 3.2.3 Filter screen: OMC company oil filter screen No 3983190
• 3.2.4 Water: distilled water
• 3.2.5 Reference oil: C11G093511
• Note: This test does not use a standard reference oil with an exact flow rate.
• Purity / preparation: not provided in the available source.

5. Apparatus and equipment

• 3.1.1 Ground-glass Erlenmeyer flask: ground joint 125 mL, 250 mL
• 3.1.2 Graduated cylinder: 100 mL
• 3.1.3 Pipette: 0.5 mL
• 3.1.4 Burette: 25 mL
• 3.1.5 Burette stand
• 3.1.6 Stopwatch
• 3.1.7 Beaker: 300 mL
• 3.1.8 Filter: Millipore company No XX30012000
• 3.1.9 Spring clip

6. Recommended operating conditions

• Placement temperature: room temperature
• Placement time: 48 h
• Shake by hand to mix evenly after adding water
• Other operating conditions: not provided in the available source.

7. Sampling and sample preparation

• 4.1 At room temperature, place volumes of 100 mL each of the test sample and reference oil into the same 250 mL ground-glass Erlenmeyer flask, cap, and shake thoroughly to mix evenly.
• 4.2 Using a 100 mL graduated cylinder, divide the above mixed oil into two portions of 80 mL and 120 mL.
• 4.3 Place the 80 mL portion of oil into a 125 mL ground-glass Erlenmeyer flask, cap tightly, and leave at room temperature for 48 h. This oil serves as the "check sample".
• 4.4 Place the 120 mL portion of oil into a 250 mL ground-glass Erlenmeyer flask, add 0.3 mL distilled water, cap, and shake by hand to mix evenly.
• 4.5 Divide the above water-containing oil equally into two portions, place each into a 125 mL ground-glass Erlenmeyer flask, cap tightly, and leave at room temperature for 48 h. One portion serves as the "test sample", and the other as a spare.
• Note: In order to make all sample pass through the filter, take 60 mL of sample, of which 50 mL is used for test determination, and 10 mL is used to fill and calibrate the burette, so that the heavy substances settled at the bottom of the flask can all be placed into the burette.

8. Analysis procedure

• 5.1 Check the check sample for obvious gel or precipitate formation. If this phenomenon occurs, the sample is considered unqualified and the test should be terminated. If this phenomenon does not occur, continue to the next step.
• 5.2 Pour the check sample into the burette, remove residual air from the spring clip to the burette liquid level, and make the liquid level higher than the "0" mark by 2～3 cm.
• 5.3 Open the spring clip, continuously measure and record the flow time for every 5 mL between the 0 and 25 mL marks.
• 5.4 After measuring the flow time of the check sample, wait until the drain tube has drained the oil, then inject the test sample into the burette as described in clause 5.2.
• 5.5 Open the spring clip, continuously measure and record the flow time of the test sample for every 5 mL between the 0 and 25 mL marks.
• 5.6 Repeat the measurement of the test sample once according to the steps described in 5.2～5.3.
• 5.7 After the test is completed, disassemble and wash, and dry the burette, plastic tube, polytetrafluoroethylene gland, and other components of the filtration system, replace with a new filter screen, and reassemble the filtration system.

9. Qualitative and quantitative determination and calculation formulas

• 6.1 The flow rate X (mL/(s·cm²) of every 5 mL of test sample (or check sample) is calculated according to formula (1):
  • X = (A/B)/C ………………(1)
  • Where: A— volume of test sample (or check sample), mL; B— flow time, s; C— effective area of the filter screen calculated from the inner diameter of the O type ring of the filter, cm².
• 6.2 The percentage decrease in flow rate Y (%) of the test sample compared with the check sample in the last 5 mL is calculated according to formula (2):
  • Y = [(b - a)/a] × 100 ………………(2)
  • Where: a— flow rate of the check sample in the last 5 mL, mL/(s·cm²); b— flow rate of the test sample in the last 5 mL, mL/(s·cm²).
• 7 Evaluation criteria:
  • 7.1 If obvious gel or precipitate is produced when performing 5.1, the sample may be considered unqualified.
  • 7.2 When the percentage decrease in flow rate of the test sample compared with the check sample in the last 5 mL is less than 20%, the sample is considered qualified.
• Appendix A (standard appendix) Example calculation of sample test results:
  • A1 Determination of flow time: The flow times shown in Table A1 are the flow times for every 5 mL of sample, measured with a stopwatch capable of continuous timing (for example, the time for the check sample to flow from the 5 mL mark to the 10 mL mark is 6.75 s). If the stopwatch used can only give elapsed time, the time at the starting mark must be subtracted to obtain the time for that interval (example: 12.36 - 5.61 = 6.75 s).
  • Table A1 Flow time at the indicated volume (volume mL / check sample s / test sample s): source-text extraction table data are severely incomplete, specific values require confirmation against the source standard (source-text extraction).
  • A2 Calculation of flow rate X: Calculate the flow rate X (mL/(s·cm²) by formula (1) of this standard, then the flow rate of the first 5 mL of the check sample is: X = (A/B)/C = (5 mL/5.61 s)/0.636 cm² = 1.40 mL/(s·cm²).
  • Table A2 Flow rate at the indicated volume (check sample mL/(s·cm²) / test sample mL/(s·cm²)): source-text extraction table data are severely incomplete, specific values require confirmation against the source standard (source-text extraction).
  • A3 Calculation of the percentage decrease in flow rate Y (%): Using the values in Table 2, calculate by formula (2) of this standard the percentage decrease in flow rate Y (%) of the test sample compared with the check sample in the last 5 mL.
  • A3.1 Percentage decrease in flow rate Y (%): Y% = (0.25 - 1.10)/1.10 = -77.3% (thus in the source text, source-text extraction doubtful point requires confirmation against the source standard).

10. Precision

• not provided in the available source.

11. Report

Take the arithmetic mean of two results from repeated determinations (rounded to one decimal place) as the determination result of the sample. The test report shall also include the following contents:

• a. Describe the occurrence of gel or precipitate in the check sample.
• b. Flow rate of the check sample at each 5 mL (results rounded to two decimal places).
• c. Flow rate of the test sample at each 5 mL (results rounded to two decimal places).
• d. Decrease in flow rate of the test sample compared with the check sample in the last 5 mL (results rounded to one decimal place).

12. Referenced documents

• not provided in the available source.

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