SH/T 0786-2006 Diesel engine oil detergency evaluation method (Caterpillar 1M-PC 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 name / English name / replacement relationship

• Standard number: SH/T 0786—2006
• Chinese full name: Diesel engine oil detergency evaluation method (Caterpillar 1M-PC method)
• English name: Standard test method for evaluation of engine oils in diesel four-stroke cycle supercharged 1M-PC single cylinder oil test engine
• Replacement relationship: not provided in the available source (the foreword only states "modified adoption of ASTM D6618-04", without mentioning replacement of an old standard number)
• Adoption relationship: modified adoption of ASTM D6618-04 "1M-PC Standard test method for evaluating internal combustion engine oils using a four-stroke single-cylinder supercharged fuel test engine"
• Publication/implementation: published by 2006-05-12, implemented by 2006-11-01
• Publishing unit: National Development and Reform Commission of the People's Republic of China
• Responsible organization: Sinopec Research Institute of Petroleum Processing
• Drafting unit: PetroChina Lubricant Research and Development Center
• Main drafters: Li Shuguang, Feng Zhenwen, Xin Zhongxian, Xie Jingchun, Niu Chengji, Liu Wenjun, Cai Jiyuan

2. Scope of application and non-applicability

• 1.1 specifies a test method for evaluating the high-temperature detergency performance of diesel engine oils, including piston deposit formation tendency, piston ring sticking, and wear of piston rings and cylinder liners, etc.
• Applicable to evaluating single-grade and multi-grade oils, such as CF, CF-2, MIL-PRF-2104 and other diesel engine oils.
• Note: In the API oil performance specifications, other properties of CF and CF-2 oils are discussed in SAE J304; for military specification oil performance tests, see MIL-PRF-2104.
• 1.2 uses International System of Units (SI) units.
• The application of 1.3 may involve hazardous materials, operations, and equipment, but does not address all safety issues; users are responsible for establishing safety and protection measures and clarifying the restricted scope of application.
• Not applicable: the available source does not explicitly list objects of non-applicability.

3. Method principle

• 4 Method summary: Before each test, completely disassemble the engine power section, clean with solvent naphtha and measure, then reassemble strictly according to technical requirements. Each test requires installation of new piston rings and cylinder liners, cleaning the engine crankcase with solvent naphtha, and replacing worn and damaged parts. The test bench should be equipped with auxiliary equipment for full-range speed, load, and various test conditions, and must also be equipped with an engine supercharging system capable of heating and humidifying.
• The test uses a single-cylinder diesel test engine, under controlled intake supercharging conditions, using the test oil as fuel, continuously operating at a fixed speed and fuel flow rate for 120 h.
• Before each test, perform 1 h break-in. After the test, inspect the piston and cylinder liner, paying attention to the degree of wear of the cylinder liner and piston rings, the nature and quantity of piston deposits, and whether the piston rings are free.

4. Reagents and materials (purity / preparation)

• 7.1 Fuel: use diesel with sulfur content of 0.4%; for physical and chemical indicators see the diesel specification in Appendix A; each test requires approximately 113 L (the original number is suspected to be source-text extraction noise, requires confirmation against the source standard (source-text extraction)).
• 7.2 Test oil: each test requires approximately 30~34 L test oil (the number before "~34L" in the original is suspected to be missing, requires confirmation against the source standard (source-text extraction)).
• 7.3 Engine coolant: for every 4 L softened water, add 8 mL rust inhibitor (part number 3P2044); softened water is defined as total dissolved solids content not exceeding 34.2 mg/L (the original "34.2i0g/L" is suspected to be source-text extraction noise, requires confirmation against the source standard (source-text extraction)); use new coolant for each test.
• 7.4 Cleaning materials:
  • 7.4.1 Solvent naphtha: use GB 1922—1980 No. 190 solvent naphtha.
  • 7.4.2 Engine cleaner: specific specification not provided in the available source.
  • 7.4.3 Cooling system cleaner: add industrial sodium sulfate and industrial sodium phosphate to softened water, ratio: to 19 L softened water add 0.45 kg industrial sodium sulfate, to 38 L softened water add 0.45 kg industrial sodium phosphate.
  • 7.4.4 Piston scrubbing solvent: n-pentane solvent.
• Appendix A (normative appendix) Fuel specification: see Table A.1 (diesel specification), items include flash point (closed cup), pour point, cloud point, water and sediment, carbon residue (10% distillation residue), ash, distillation (initial boiling point/10%/50%/90% distillation temperature/final boiling point), kinematic viscosity (40℃), sulfur content, corrosion test (copper strip, 50℃, 3h), acid number, cetane number, density (20℃), gravity (°API), cracked materials, hydrocarbon composition, etc.; test methods cited include GB/T 261, GB/T 3535, GB/T 6986, GB/T 260, GB/T 6531, GB/T 268, GB/T 508, GB/T 511, GB/T 6536, GB/T 265, GB/T 380, GB/T 5096, GB/T 7304, GB/T 386, GB/T 1884, GB/T 1885, SH/T 0606, GB/T 11132, etc. Specific indicator values are misaligned due to the source-text extraction table, requires confirmation against the source standard (source-text extraction).

5. Instruments and equipment

• 6.1 Test engine: dedicated supercharged single-cylinder diesel engine, model 1Y73, displacement 2.2 L, bore 130 mm, stroke 165 mm (Table 1, some values source-text extraction suspected issues require confirmation against the source standard (source-text extraction)); diesel specification see Appendix A, engine installation and auxiliary components see Appendix B.1.
• 6.2 Intake pressure: use a supercharged air machine or other equipped device to control intake pressure.
• 6.3 Intake system: use 1Y38 surge tank and air heating device, see Appendix B Figure B.2.
• 6.4 Humidity: use a control system to control humidity within the specified test condition range.
• 6.5 Cooling system: closed, pressurized circulating cooling system, equipped with a centrifugal pump driven by the engine.
• 6.6 Speed/load control: use a dynamometer or suitable loading device to control speed and measure load.
• 6.7 Starting system: maintain 373 N·m torque at engine speed of approximately 200 r/min; can automatically disengage when torque increases to 420 N·m.
• 6.8 Exhaust system: includes piping, exhaust surge tank, and exhaust back pressure control valve; dimensions and distance requirements see Appendix B.
• 6.9 Data acquisition system: capable of automatically acquiring parameters such as speed, fuel flow rate, intake pressure, intake temperature, coolant temperature, main oil gallery temperature, piston cooling nozzle pressure, etc., and capable of closed-loop control of speed, intake pressure, intake temperature, coolant temperature, main oil gallery temperature, etc.
• 6.10 Cylinder head and cylinder assembly: only cylinder head and cylinder assemblies that have previously passed calibration tests are allowed for oil testing.
• 6.11 Piston cooling nozzle: 6.11.1 pressure measurement (6.11.1.1–6.11.1.4 specific modification requirements); 6.11.2 use Mobil EF-411 oil to calibrate the nozzle; under calibration oil 37.8℃±0.6℃ and 165.5 kPa±0.5 kPa conditions, flow rate within 1.89 L/min–2.27 L/min range is acceptable.
• 6.12 Oil level dipstick: modify at 50 mm from the end according to Appendix B Figure B.4.
• 6.13 Crankcase pressure control valve: install 1Y479 at the crankcase breather outlet, see Figure B.5.
• 6.14 Oil cooler inlet temperature: install a thermocouple at the rear end cover of the oil heat exchanger near the oil inlet pipe.
• 6.15 Engine oil system: use the latest oil suction strainer screen (1Y3549), modify the oil pump according to Appendix B Figure B.6.
• 6.16 Cooling system: replace the standard cooling tank of diameter 76 mm with a pressurized cooling tank of diameter 127 mm, equipped with a bypass flow control valve and flow meter (#BR12705-16-31 Venturi flow meter); inlet and outlet pipe requirements see Appendix B Figure B.7, Figure B.8.
• 6.17 Fuel system: use standard fuel system, Micro-Motion fuel consumption meter to measure fuel flow rate; standard fuel line length 1070 mm±10 mm; use an external fuel pump instead of the engine-driven fuel pump, see Appendix B Figure B.9.
• 6.18 Intake system: install a dry air filter, pressure difference of approximately 1.5 kPa~1.8 kPa at 318 kg/h flow rate; humidity control system accuracy ±0.648 g (the original unit is suspected to be g/kg, requires confirmation against the source standard (source-text extraction)).
• 6.19 Exhaust system: dimensions and distances of piping, exhaust surge tank, and exhaust back pressure control valve see Appendix B Figure B.10~Figure B.14.
• 6.20 Crankcase blowby measurement meter: positive displacement gas flow meter equipped with an oil-gas separator and surge tank.
• 6.21 Thermocouples: intake temperature (1Y468), exhaust temperature (1Y467), oil (1Y466) thermocouples; calibration specifications see Table 2, Table 3, Table 4; 6.21.1 installation position requirements: intake thermocouple depth 27 mm±2 mm, exhaust thermocouple depth 65 mm±2 mm.
• 6.22 Accessories: procurement, handling process for non-conforming quality, return review claim form template see Table 5.

6. Recommended operating conditions

• Table 3 Operating specifications, measurement precision, report precision (some values source-text extraction doubtful and requires confirmation against the source standard (source-text extraction)):
  • Speed: 1800 r/min±10 r/min
  • Power: 31.3 kW
  • Heat input: 6172 kJ/min±53 kJ/min
  • Mean effective pressure: 951 kPa
  • Fuel flow rate: 8.13 kg/h±0.07 kg/h
  • Humidity: 17.8 g/kg±1.7 g/kg
  • Coolant outlet temperature: 87.8℃±2.8℃
  • Coolant inlet temperature: 82.8℃ (deviation requires confirmation against the source standard (source-text extraction))
  • Oil temperature: 96.1℃±2.8℃
  • Intake air temperature: 123.9℃±2.8℃
  • Exhaust temperature: 573℃±28℃
  • Fuel pressure: 137.9 kPa±13.8 kPa
  • Exhaust pressure: 106.7 kPa±1.7 kPa
  • Oil nozzle pressure: 165.5 kPa±13.8 kPa
  • Oil pressure: 220.6 kPa (maximum)
  • Intake air pressure (absolute): 179.0 kPa±1.0 kPa
  • Crankcase vacuum: 0.25 kPa±0.12 kPa
  • Coolant flow rate: 57.9 L/min±3.8 L/min
• Table 4 Maximum allowable constant time: speed 3.0 s, fuel flow rate 73.0 s, coolant outlet 3.0 s, coolant inlet 3.0 s, oil temperature 3.0 s, intake air temperature 3.0 s, exhaust temperature 3.0 s, oil pressure 3.0 s, oil nozzle pressure 3.0 s, intake air pressure 3.0 s, exhaust pressure 3.0 s, fuel pressure 3.0 s, crankcase vacuum 3.0 s (some values source-text extraction doubtful and requires confirmation against the source standard (source-text extraction)).
• Table 2 Calibration deviation: speed absolute error ≤0.125%, fuel flow rate 0.25, coolant outlet temperature 0.25, coolant inlet temperature 0.5, oil temperature 0.5, intake air temperature 1.0, exhaust temperature 0.7, oil pressure 0.7, oil nozzle pressure 0.3, intake air pressure 0.3, exhaust pressure 0.7, fuel pressure 0.02, crankcase vacuum (value requires confirmation against the source standard (source-text extraction)).

7. Sampling and specimen preparation

• 10.1 Engine break-in: add 4.80 kg±0.11 kg test oil; for non-reference oil tests, take 240 mL oil samples to measure 40℃ viscosity and report; break-in 1 h; after break-in, while the engine is hot, drain the test oil completely from the crankcase, governor chamber, oil cooler, and oil filter; drain time 30 min.
• Table 7 Break-in conditions: step 1 (1000 r/min, 0 kW, 5 min), step 2 (1000 r/min, 1.36 kW, 5 min), step 3 (1600 r/min, 7.5 kW, 10 min), step 4 (1600 r/min, 17.1 kW, 20 min), step 5 (1800 r/min±10 r/min, 31.3 kW, 20 min); Note: measure blow-by during the last 15 min of the break-in conditions.
• 9.11 Piston cleaning: before installing new pistons with piston rings and mounting them in the engine, spray-wash with aviation washing gasoline, blow dry with compressed air, scrub with a thick cloth dipped in n-pentane solvent (pay special attention to ring grooves and ring lands), blow dry with instrument air, and coat the pistons with test oil before installation.
• 9.12 Cylinder head: requirements for valve guide replacement, reaming, grinding, etc. (9.12.1.1~9.12.1.8); the prechamber passage hole diameter should be 7.620 mm±0.025 mm (9.12.2).
• 9.13 Fuel injector: check the injector tip for carbon deposits and damage, replace problematic injectors, and check the injector valve operating pressure before each test.
• 9.14 Measurements: measure the piston, piston rings, cylinder liner, and fuel injection advance angle before and after the test; use new pistons, piston rings, and cylinder liners for each test; measure and record the compression ratio before each test.
  • 9.14.1 Cylinder liner measurement: out-of-roundness not exceeding 0.038 mm; cylindricity measured at 25.4 mm and 229 mm; inner diameter difference should not exceed 0.051 mm.
  • 9.14.2 Post-test cylinder liner wear measurement: measure at two locations, 20 mm and 25 mm, downward from the top of the cylinder liner.
  • 9.14.3 Piston ring gap: piston ring gauge inner diameter 130.2 mm.
  • 9.14.4 Piston ring side clearance measurement: allowable side clearance for new top ring specimens 0.114 mm–0.185 mm, for the two middle rings 0.038 mm–0.076 mm, for the oil ring (value requires confirmation against the source standard (source-text extraction)).
  • 9.14.5 Compression ratio measurement: use lead balls or fuse wire with 4 particle diameter 2.467 mm; the average value should be within the range 0.300 mm±0.127 mm (the original text "300mm" is suspected to be source-text extraction noise, requires confirmation against the source standard (source-text extraction)).
  • 9.14.6 Piston ring gap positions: use 1Y3589 piston and 1Y3588 ring set, see Appendix B Figure B.26.

8. Analysis procedure

• 10.2 Preparation before the formal test: add 4.80 kg±0.11 kg test oil to the engine and perform the warm-up procedure.
• 10.3 Warm-up procedure: complete the warm-up procedure according to Table 8 steps 1~5; after completing the warm-up conditions, turn off the heating elements and switch to the test conditions (Table 9).
• Table 9 Test conditions: speed 1800 r/min±10 r/min, fuel flow rate 8.13 kg/h±0.07 kg/h, coolant outlet temperature 87.8℃±2.8℃, coolant flow rate 57.9 L/min±3.8 L/min, oil temperature 96.1℃±2.8℃, intake air temperature 123.9℃±2.8℃, exhaust temperature 573℃±28℃, fuel pressure 0.25 MPa±0.12 MPa (the original unit is suspected to be kPa, requires confirmation against the source standard (source-text extraction)), exhaust pressure (absolute) 17.8 kPa±1.7 kPa, oil nozzle pressure 165.5 kPa±13.8 kPa, oil pressure 220.6 kPa (maximum), intake air pressure (absolute) 179.0 kPa±1.0 kPa, crankcase vacuum 0.25 kPa±0.12 kPa, humidity 17.8 g/kg±1.7 g/kg, intake air flow rate (approximately) 3 m³/min (some values source-text extraction doubtful and requires confirmation against the source standard (source-text extraction)).
• 10.5 Periodic measurements: except for engine air flow rate, record test data every hour; record crankcase blow-by every 12 h; the time to switch from the normal operating system to the blow-by measurement system shall not exceed 4 min; record engine load (approximately 31.3 kW), oil addition and drain weights, and test parameters (see Appendix D).
• 10.6 Test oil level measurement: use the lower insertion-type dipstick; pull it out, wipe it clean, insert it with the graduated side facing the operator, count 5 s, pull it out and read.
• 10.7 Test oil filling procedure: after break-in, drain the test oil 30 min and add 4.80 kg±0.11 kg new oil; during the 1 h of the test, when the oil temperature reaches 96.0℃±2.8℃, record the dipstick level as the full mark; the drain level is 2 unit graduations below the full mark, the low level is 2.5 unit graduations, and the safe level is 3 unit graduations; check the level every 12 h and handle according to 10.7.4.1~10.7.4.4; if the level is below the safe level, immediately add 0.80 kg±0.22 kg new oil.
• 10.8 Cooling shutdown procedure: see Table 10; stop the test timing when the shutdown procedure begins, turn off the heating elements and allow the air temperature to cool naturally.
• Table 10 Cooling shutdown: step 1 (1600 r/min, 17.1 kW, 5 min), step 2 (1000 r/min, 7.5 kW, 5 min), step 3 (1000 r/min, 1.36 kW, 5 min).
• 10.9 Emergency shutdown: record the time and interval of each emergency shutdown; maintain 2 h shutdown time for cooling before restarting; the total shutdown time during each test should not exceed 125 h; during shutdown, turn the flywheel to top dead center of the compression stroke.
• 10.10 Fuel system: before each test, after draining fuel from the fuel system, remove air from the fuel.
• 10.11 Calculation of brake-specific oil consumption rate (BSOC): according to formula (3) BSOC = (a-b)/(120×N), where N is the average power (kW), a is the total oil added (kg), and b is the total oil drained (kg); Note: if BSOC exceeds 1.216 g/kW·h, the test is invalid.
• 11 Check after the test: 11.1 Wipe the solvent off the test piece with a clean soft dry cloth and wipe the oil film off the piston; 11.2 Inspect the piston and cylinder liner and photograph the piston, and write a complete inspection description; before photographing, remove all piston rings from the piston, confirm and record the wear amounts of the cylinder liner and rings; inspect the piston and piston rings according to CRC manual N20 (2001).
  • 11.2.1 Lighting: diameter 200 mm, 20 W cool white ring-shaped lamp tube, part number #FC87-CW-RS23.
  • 11.2.4 It is recommended to use a 20 equally divided deposit dividing mesh cover, each equal division being an area of 5%.
  • 11.2.5 Piston ring groove carbon deposits are divided into three grades: heavy carbon, medium carbon, and light carbon (definitions see 11.2.5.1~11.2.5.3).
  • 11.2.6 Piston ring land carbon deposits are divided into two grades: heavy carbon and light carbon (definitions see 11.2.6.1~11.2.6.2).
  • 11.2.7 Rating environment: carried out in a standard rating box, using a new piston as the clean standard for comparative rating.
• 11.3 Rating: align area number 1 of the rating cover with the front of the piston.
  • 11.3.1 Carbon deposit coefficient: for deposit types and property coefficients see Table 11 (coefficients corresponding to heavy carbon, medium carbon, and light carbon; specific values source-text extraction unclear in the source text, requires confirmation against the source standard (source-text extraction)).
  • 11.3.2 Varnish deposit grades: according to CRC manual N20 (2001), divided into grades 9, 8, 7, 6, 5, 4, 3, 2, 1.
  • 11.3.3 Area weighting coefficients: see Table 12 (area weighting coefficients for first ring groove, second ring groove, third ring groove, fourth ring groove, second ring land, fourth ring land, etc.; specific values source-text extraction unclear in the source text, requires confirmation against the source standard (source-text extraction)).
  • 11.3.4 Rating calculation: according to formula (4) weighted total rating = Σ(ai × bi × ci), where ai is the area of varnish or carbon deposit in the area (%), bi is the varnish grade or carbon deposit thickness coefficient for each area, and ci is the weighting coefficient for each area; Note 1: the percentage of deposit coverage area is counted as an integer; Note 2: when calculating the sum of area weighted ratings, retain two digits after the decimal point, round the third digit after the decimal point according to the "numerical rounding rules", and after rounding the total weighted rating retain only one digit after the decimal point.

9. Qualitative and Quantitative and Calculation Formulas

• Formula (1): G = Max₁ - Max₂ (piston ring side clearance loss, Max₁ is the maximum piston ring clearance before the test, Max₂ is the maximum piston ring clearance after the test).
• Formula (2): G = Min₁ - Min₂ (Min₁ is the minimum piston ring clearance before the test, Min₂ is the minimum piston ring clearance after the test).
• Formula (3): BSOC = (a - b) / (120 × N), N is the average power (kW), a is the total amount of oil added (kg), b is the total amount of oil discharged (kg).
• Formula (4): weighted total rating = Σ(ai × bi × ci).
• Formula (5): calculation of out-of-limit percentage (specific expression source-text extraction unclear in the source text, requires confirmation against the source standard (source-text extraction)), involving parameters: rounded measured parameter, specified mid-range value, mid-range length, 60 hour conversion coefficient, 100 percentage unit conversion coefficient, 120 hours.
• Formula (6): N = (x - S₁) / S × 100, N is the mid-range percentage (%), x is the average value of the measured parameter during the entire test period, S₁ is a single measurement value, S is the specification upper limit minus the specification lower limit.
• 12.3 Calculation of parameter out-of-limit percentage and mid-range percentage: 12.3.1 Record data in the international units given in Table 4; 12.3.2 Use the international unit test specifications and deviations given in Table 4 for percentage calculations; 12.3.3 When recording data, calculate using the same units, and do not convert units before calculating percentages; 12.3.4 The recording frequency is determined by the laboratory itself, but at minimum should be recorded once every 1 h; 12.3.9 Use the ASTM rounding provisions.
• Table 13 Allowable limits for parameter out-of-limit and mid-range percentages: rotational speed (out-of-limit 5%, mid-range 20%), fuel flow rate (10%, 25%), coolant flow rate (5%, 25%), coolant outlet temperature (5%, 20%), oil temperature (20%, 5%), intake air temperature (5%, 25%), oil nozzle pressure (10%, 10%), intake air pressure (absolute) (10%, 10%), exhaust pressure (absolute) (values require confirmation against the source standard (source-text extraction)), fuel pressure (values require confirmation against the source standard (source-text extraction)), crankcase vacuum (values require confirmation against the source standard (source-text extraction)).

10. Precision

• 13 Precision: judge the reliability of test results according to the following provisions (95% confidence level).
• 13.1 Precision: based on reference oil test results (valid operation tests), test results are supervised and approved by the ASTM test monitoring center, see Table 14.
  • 13.1.1 Intermediate precision (IP): the difference between results obtained consecutively for the same sample in the same laboratory under constant operating conditions.
  • 13.1.2 Reproducibility (R): the difference between two test results obtained by different operators, different instruments, and the same method on the same sample shall not exceed the value in Table 14.
• 13.2 Bias: determined from the results of a stable reference oil; once a valid bias is determined, strict adjustment of test results for non-reference oils is permitted (refer to ASTM TMC memorandum 94-200).
• Table 14 1M-PC Reference Oil Precision:
  • Top ring groove carbon filling (%): intermediate precision SᵢP = 17, reproducibility R = 49.8
  • Weighted rating: intermediate precision SᵢP = 43.3, reproducibility R = 47.6 (the original numerical arrangement is suspected to have source-text extraction misalignment, requires confirmation against the source standard (source-text extraction))
  • Note 1: The above data are made based on ASTM test monitoring reference oils 873 and 873-1.
  • Note 2: Sr is the intermediate precision standard deviation.
  • Note 3: SR is the reproducibility standard deviation.

11. Report

• 14 Report: The test result report content includes bench reference oil test results and test oil piston rating, auxiliary part rating, test conditions, test oil consumption, wear conditions, piston photographs, shutdown conditions, etc. For the report format see Appendix D.
• Appendix D (informative appendix): Diesel engine oil detergency evaluation method (Caterpillar 1M-PC method) result report.
• 12.2 For the test report format see Appendix D.
• 12.3.7 For recording new data and descriptions see Appendix D; Table D.9 in Appendix D records the percentage calculation during each test.

12. Referenced Documents

• GB/T 253 Kerosene for lamps
• GB/T 260 Determination of water in petroleum products
• GB/T 261 Determination of flash point of petroleum products (closed cup method) (GB/T 261—1983, ISO 2719—1973, REF)
• GB/T 265 Determination of kinematic viscosity of petroleum products and calculation of dynamic viscosity
• GB/T 268 Determination of carbon residue of petroleum products (Conradson method) (GB/T 268—1987, ISO 6615—1983, EOV)
• GB/T 380 Determination of sulfur content in petroleum products (lamp method)
• GB/T 386 Determination of ignition quality of diesel fuel (cetane number method)
• GB/T 508 Determination of ash in petroleum products (GB/T 508—1985 (91), ISO 6245—1982, REF)
• GB/T 511 Determination of mechanical impurities in petroleum products and additives (gravimetric method)
• GB/T 1884 Laboratory determination of density of crude oil and liquid petroleum products (hydrometer method) (GB/T 1884—2000, ISO 3675—1998 EOV)
• GB 1922—1980 Solvent naphtha
• GB/T 3535 Determination of pour point of petroleum (GB/T 3535—1998, ISO 3016—1997, REF)
• GB/T 5096 Copper strip corrosion test method for petroleum products
• GB/T 6531 Determination of sediment in crude oil and fuel oil (extraction method) (GB/T 6531—1986, ISO 3735—1975, EOV)
• GB/T 6536 Determination of distillation of petroleum products
• GB/T 6986 Determination of cloud point of petroleum (GB/T 6986—1986 (91), ISO 3015—1974, EOV)
• GB/T 7304 Determination of acid number of petroleum products and lubricants (potentiometric titration method)
• GB/T 11132 Determination of hydrocarbon types in liquid petroleum products (fluorescent indicator adsorption method)
• SH/T 0042 Calcium petroleum sulfonate detergent
• SH/T 0606 Determination of hydrocarbon composition of middle distillates (mass spectrometry method)
• Note: Some standard numbers in the original text source-text extraction are unclear in the source text (e.g., "GB/1 253" should be GB/T 253, "CB/T" should be GB/T, etc.), requires confirmation against the source standard (source-text extraction).

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