SH/T 0772-2005 Determination of Engine Oil Filtration Performance (After Treatment with Water and Dry Ice and Short-Time Heating)

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Card type: Test method

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

• Standard number: SH/T 0772-2005
• Chinese full name: Determination of Engine Oil Filtration Performance (After Treatment with Water and Dry Ice and Short-Time Heating)
• English name: Standard test method for measuring the effect on filterability of engine oils after treatment with water and dry ice and a short heating time
• Replacement relationship: not provided in the available source (no replacement of any standard is mentioned)
• Adoption relationship: modified adoption of ASTM D6795-02 "Determination Method for Engine Oil Filtration Performance (After Treatment with Water and Dry Ice and Short-Time (30min) Heating)", redrafted according to ASTM D6795-02
• Main technical differences from ASTM D6795-02: some referenced standards adopt the corresponding national standards and petrochemical industry standards of our country; added the mechanical oscillator of clause 6.8 and the requirement for oscillating treatment of samples before testing of clause 9.4
• Editorial modifications: the expressions of repeatability and reproducibility are modified according to the practice of our country; the chapter on keywords is removed
• Publication/implementation: published on 2005-10-10, implemented on 2006-02-01
• Issuing body: National Development and Reform Commission of the People's Republic of China
• Technical committee: Sinopec Research Institute of Petroleum Processing
• Drafting organization: Lubricant Branch of Sinopec Corp.
• Main drafters: Zhu Heju, Cui Haiou, Zhang Chunhui, Li Wanying, Xia Peng
• Appendix: Appendix A is a normative appendix

2. Scope of application and non-applicability

• 1.1 This standard specifies a method for determining the filtration performance of engine oils in the presence of water and dry ice. It simulates the tendency of a new engine after short-term operation, in the presence of water in the oil, during long-term storage, to form deposits that easily clog filters.
• 1.2 This standard uses International System of Units [SI] units.
• 1.3 This standard involves certain hazardous materials, operations and equipment, but does not purport to address all safety problems associated with them. Therefore, it is necessary for users to establish appropriate safety and protective measures before using this standard, and to determine corresponding management regulations.
• Non-applicable scope: not provided in the available source as an explicit list.

3. Method principle

• 4 Method summary: treat the sample with deionized water and dry ice, heat the sample to 70℃ and hold for 30min, then store at room temperature, after which the sample is filtered, and the flow rate of the sample is calculated (the original text here has a defect at source-text extraction, the specific wording requires confirmation against the source standard (source-text extraction)).
• 5.6 This test method requires a known sample to give an upper limit of the determination data (the original text here has a defect at source-text extraction, requires confirmation against the source standard (source-text extraction)).
• Note: if the test result of new oil is used as a reference (the original text here has a defect at source-text extraction, requires confirmation against the source standard (source-text extraction)).
• This test method determines the maximum value of the loss of filtration performance (flow reduction) of the test oil relative to new oil (the original wording requires confirmation against the source standard (source-text extraction)).

4. Reagents and materials (purity / preparation)

• 7.1 Purity of reagents: use chemically pure reagents in all tests unless otherwise specified. All reagents shall meet the requirements of GB/T 603. If it can be demonstrated that a reagent has sufficient purity, other grades of reagent may also be used.
• 7.2 Purity of water: unless otherwise specified, use deionized water meeting the grade three specification in GB/T 6682.
• 7.3 TMC Reference oil: reference oil available from the American Society for Testing and Materials Test Monitoring Center.
• 7.4 Dry ice: solid carbon dioxide.
• 9.1 Involves: new oil 49.7g±0.1g, deionized water 0.3g±0.05g (added with a 1000μL syringe in 0.3mL±0.05mL), dry ice about 10g.

5. Apparatus and equipment

• 6.1 Equipment includes a 25mL burette, a filter with perforated (pore size 25μm) filter paper, and a compressed air source of 69kPa±2kPa (see Figure 1).
• 6.1.1 Burette: 25mL, plastic or glass material, with a polytetrafluoroethylene stopcock and an open burette tip with an inner diameter of 1.8mm±0.1mm.
• 6.1.2 Air pressure regulator: adjust the pressure so that it can reach 69kPa±2kPa.
• 6.1.3 Filter: effective filtration area is approximately 0.8cm².
• 6.1.4 Filter paper: diameter 25mm (pore size 25μm), the filter paper should be cut to a size suitable for the filter.
• 6.2 Stirrer: rotation speed is 18000r/min±1800r/min.
• 6.2.1 Stopwatch: can measure 30s±1s.
• 6.3 Mixer: 250mL, with blades matching the stirrer.
• 6.4 Syringe: 1000μL.
• 6.5 Oven: temperature can be maintained (the original text has a defect at source-text extraction, requires confirmation against the source standard (source-text extraction)).
• 6.6 Time sensor (or other (the original text has a defect at source-text extraction, requires confirmation against the source standard (source-text extraction))).
• 6.7 Glass bottle: with an inner (the original text has a defect at source-text extraction, requires confirmation against the source standard (source-text extraction)) cap capable of (the original text has a defect at source-text extraction, requires confirmation against the source standard (source-text extraction)) 60mL.
• 6.8 Mechanical oscillator.

6. Recommended operating conditions

• Heating conditions: 70℃±1℃ (the original text is "704 ± 14", source-text extraction doubtful point, requires confirmation against the source standard (source-text extraction)), hold for 30min±2min.
• Cooling/storage temperature: room temperature 20℃~24℃.
• Timing of filtration determination: determine filterability after the test oil is taken out of the oven for 48h±2h (9.5).
• Filter drying: dry in an oven at 70℃±2℃ for 30min±2min, store in a desiccator for later use (9.6).
• System pressure: 69kPa±2kPa.
• Stirring conditions: 18000r/min±1800r/min, stir for 30s±1s.
• Flow rate determination segments: the time required for every 5mL to flow out within the 0mL~25mL segment.

7. Sampling and sample preparation

• 8 Sampling: sample according to the requirements of GB/T 4756.
• 9.1 Mix 49.7g±0.1g of new oil, 0.3g±0.05g of deionized water (added with a 1000μL syringe in 0.3mL±0.05mL) and about 10g of dry ice in a mixer, and stir at 18000r/min±1800r/min for 30s±1s, cover with a lid to prevent the test oil sample from splashing out when the dry ice rapidly vaporizes.
• 9.2 Pour the test oil into a 60mL wide-mouth glass bottle, tighten the cap and then loosen it by one quarter turn, place in an oven at 70℃±1℃ for 30min±2min. Remove the sample from the oven, tighten the cap and cool to room temperature (20℃~24℃).
• 9.3 Store the test oil at room temperature (20℃~24℃) in a dark place.
• 9.4 Before filtering the test oil, place the glass bottle upside down in a mechanical oscillator and oscillate at high speed until there is no sediment at the bottom of the bottle.
• 9.5 Determine filterability after the test oil is taken out of the oven for 48h±2h.
• 9.6 Dry the filter in an oven at 70℃±2℃ for 30min±2min, and store in a desiccator for later use.

8. Analysis procedure

• 10.1 Install the test equipment according to Figure 1, place the filter gasket, filter element and filter paper in the filter, with the smooth side of the filter paper facing up. Tighten the upper and lower parts of the filter and connect to the burette.
• 10.2 Determine the flow rate of new oil as it passes through the burette. Apply pressure to the system so that at least 10mL of new oil passes through the filter, ensuring that the new oil fills the filter and removes any air bubbles. Remove the air connection tube, fill the burette with new oil to 1cm–2cm above the 0 scale line. Adjust the pressure system to a pressure of 69kPa±2kPa, open the stopcock, and determine the time required for every 5mL to flow out within the 0mL–25mL segment of the test oil.
• 10.3 To determine the flow rate of the test oil, after completing the determination of the flow time of new oil according to the procedure of clause 10.2, drain the new oil as much as possible to the lowest level of the burette, and ensure that no air bubbles are allowed below the stopcock. Use the same filter element, filter and burette to determine the test oil. Remove the air connection tube, load the uniformly mixed test oil into the burette to 1cm–2cm above the 0 scale line. Adjust the pressure system to a pressure of 69kPa±2kPa, open the stopcock, and determine the time required for every 5mL to flow out within the 0mL–25mL segment of the test oil.
• 10.4 Each non-reference oil and reference oil shall be tested in duplicate, that is, repeat the operation for each non-reference oil and reference oil according to the procedures of Chapter 9 and clauses 10.1~10.4.
• 10.5 For tests under the monitoring of TMC, the TMC reference oil and non-reference oil shall be determined on the same day.
• 10.6 For tests not under the monitoring of TMC, an internal quality assurance oil may be used instead of the TMC reference oil.

9. Qualitative and quantitative determination and calculation formulas

• 11.1 The flow rate of new oil and test oil per 5mL (Z), mL/s, is calculated according to formula (1):
  • Z = A / B ………………(1)
  • Where: A—— volume of the oil, mL; B—— flow time, s.
• 11.2 The percentage change in the final segment flow rate of the test oil relative to new oil (Δ) is calculated according to formula (2) (the final segment flow rate refers to the flow rate of 20mL~25mL):
  • Δ = [(D − E) / D] × 100 ………………(2)
  • Where: D—— final segment flow rate of new oil, mL/s; E—— final segment flow rate of test oil, mL/s.
  • Note: In the original text, formula (2) source-text extraction is displayed as "41 number element" × 100, the formula symbols require confirmation against the source standard (source-text extraction).

10. Precision

• Judge the reliability of the 25μm filter paper test results (confidence level of 95%) according to the following provisions.
• 14.1.1 Repeatability (r): shall not be greater than 11.4%.
• 14.1.2 Reproducibility (R): For two test results obtained by different operators, using different test equipment, and the same test method on the same sample, the difference shall not be greater than 23.6%.
• 14.2 Bias: Because there is no acceptable reference material for this test method for bias determination, bias is not stated (the source text source-text extraction is unclear in the source text, requires confirmation against the source standard (source-text extraction)).

11. Report

• 13.1 Identification of the non-reference oil or reference oil.
• 13.2 The pore size of the filter paper used (25μm).
• 13.3 The percentage change in flow rate at the final segment of each test.
• 13.4 The average percentage change in flow rate at the final segment of repeated tests.
• 13.5 For the TMC monitoring test, the report content requirements of TMC are met.
• 13.6 For tests not under TMC monitoring, oils with internal quality control samples and known filterability results may be used to evaluate whether the test results are acceptable.

12. Normative References

• GB/T 603 Chemical reagents—Preparation of preparations and products used in test methods
• GB/T 4756 Petroleum liquids—Manual sampling (GB/T 4756-1998, MOD, ISO 3170:1988)
• GB/T 6682 Water for analytical laboratory use—Specification and test methods (GB/T 6682-92, NEQ, ISO 3696:1987)
• ASTM D4485 Performance indicators and technical specifications for engine oils
• ASTM D6795-02 (the original standard adopted with modification)

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 Q&A Reference