SH/T 0302-1992 Test method for ammonia resistance of ammonia-resistant turbine oils

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Card type: Test method

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

• Standard number: SH/T 0302—92
• Full title: Test method for ammonia resistance of ammonia-resistant turbine oils
• English name: not provided in the available source
• Replacement relationship: replaces SY 2687—83
• Approval/implementation: approved by China Petrochemical Corporation 1992-05-20, implemented on 1992-05-20

2. Scope of application and non-applicability

• This standard specifies the test method for determining the ammonia resistance of ammonia-resistant turbine oils (Chapter 1).
• This standard applies to ammonia-resistant turbine oils (Chapter 1).
• Not applicable: not provided in the available source.

3. Method principle

• Continuously pass 12 h ammonia gas into a 800 mL sample (ammonia gas flow rate is 115 mL/min ± 2 mL/min), then let stand for 12 h, shake the sample, and visually inspect whether precipitate separates out (3.1).
• Under the specified test conditions, the sample fully contacts ammonia gas, acidic substances in the oil react chemically with ammonia, and after settling, the sample is shaken to observe whether precipitate separates out; separation of precipitate indicates failure in ammonia resistance, and absence of precipitate separation indicates pass in ammonia resistance (3.2).

4. Reagents and materials (purity / preparation)

• Aviation washing gasoline: meets the specification requirements of SH 0114 (4.2.1).
• Ammonia gas: purity not lower than 99.9% (4.2.2).
• Benzene: analytical reagent (5.1).
• Anhydrous ethanol: chemical reagent (5.2).
• Appendix A reagents:
  • Mixed indicator solution: 2 g/L methyl red indicator solution and 2 g/L methylene blue indicator solution are mixed in a volume ratio of 1:1 (A3.1).
  • c(HCl)=0.1 mol/L hydrochloric acid standard titration solution (A3.2).

5. Instruments and equipment

• Gas absorption bottle: diameter 65 mm ± 2 mm, height 400 mm ± 2 mm, volume 1000 mL (with a ring-shaped graduation line at 800 mL) (4.1.1).
• Constant-temperature water bath: 300 mm × 500 mm (4.1.2).
• Thermometer: 0~100 ℃, scale division value 1 ℃ (4.1.3).
• Ammonia gas pressure regulator: type LK-01 or another type of carrier gas pressure regulator (4.1.4).
• Pressure gauge: 0–245 kPa (0–2.5 kgf/cm²) (4.1.5).
• Float flowmeter: 0~120 scale or differential-pressure flowmeter (4.1.6).
• Foam head: permeability 3000~6000 mL/min, pore diameter not greater than 80 μm (4.1.7).
• Narrow-mouth bottle: 1000 mL (4.1.8).
• Schematic diagram of instrument installation (Chapter 6): 1— calcium oxide drying tube; 2— pressure-regulating valve; 3— pressure gauge; 4— stopcock; 5— float flowmeter (or differential-pressure flowmeter); 6— foam head; 7— absorption bottle; 8— water bath.
• Appendix A instruments:
  • Absorption bottle: 250 mL (A2.1).
  • Thermometer: 0~100 ℃, scale division value 1 ℃ (A2.2).
  • Barometer (A2.3).
  • Stopwatch (A2.4).
  • Magnetic stirrer (A2.5).

6. Recommended operating conditions

• Ammonia gas flow rate: 115 mL/min ± 2 mL/min (3.1, 7.2).
• Ammonia passage time: continuous 12 h (3.1, 7.2).
• Standing time: 12 h (3.1, 7.3).
• Water bath temperature: 65 ℃ ± 2 ℃ (7.1, the source text reads “65°CC2 seven”, requires confirmation against the source standard (source-text extraction)).
• Foam head position: 10 mm from the bottom of the absorption bottle (7.1).
• Sample amount: 800 mL (3.1, 7.1).

7. Sampling and sample preparation

• Filter the sample with industrial filter paper (to remove water and impurities), take 800 mL of the filtered sample, and pour it into a clean, dry absorption bottle (7.1).
• Cleaning of the absorption bottle: first clean with aviation washing gasoline, then wash with benzene, and finally wash with anhydrous ethanol, then air-dry for later use (6.3).

8. Analytical procedure

• Install the test apparatus according to the diagram (6.1).
• After the apparatus is installed, perform a system leak test to ensure the system does not leak (6.2).
• Filter the sample with industrial filter paper (to remove water and impurities), take 800 mL of the filtered sample, pour it into a clean, dry absorption bottle, then place the foam head so that it is 10 mm from the bottom of the absorption bottle, and then place the absorption bottle into a 65 ℃ ± 2 ℃ constant-temperature water bath (7.1).
• Connect the ammonia gas rubber tube, open the ammonia gas valve, adjust the ammonia gas flow rate to 115 mL/min ± 2 mL/min, and continuously pass ammonia gas for 12 h (7.2).
• After passing ammonia gas for 12 h, close the ammonia gas valve and take out the absorption bottle, wipe dry the water on the outside and at the bottle mouth with filter paper to prevent external moisture from entering the sample, pour the sample into a 1000 mL narrow-mouth bottle and let stand for 12 h, then first observe whether there is obvious precipitate at the bottom of the bottle; if not obvious, shake the narrow-mouth bottle by hand to observe whether the sample has suspended precipitate (7.3).
• Note: Before ammonia gas enters the absorption bottle, it must be dried with a calcium oxide drying tube; otherwise, trace moisture will affect the ammonia resistance test result and cause a qualified sample to become unqualified (Chapter 8 note).

9. Qualitative and quantitative determination and calculation formulas

• Result judgment: visually inspect whether precipitate separates out from the sample; absence indicates the sample passes ammonia resistance; presence indicates the sample fails ammonia resistance (8.1).
• The determination result is taken as the two results of repeated determination being consistent; if one of them is unqualified, the test is redone (8.2).
• Appendix A calculation of the ammonia gas flowmeter calibration method:
  • Ammonia gas flow rate X (mL/min) is calculated according to formula (1): X = R T / (P t) (the source formula is typeset as “X= R T / Pt”, requires confirmation against the source standard (source-text extraction)).
  • The number of moles of ammonia gas n is calculated according to formula (2): the source formula is “7=g2%6”, requires confirmation against the source standard (source-text extraction).
  • Where: c— actual concentration of the hydrochloric acid standard titration solution, mol/L; V— volume of the hydrochloric acid standard titration solution, mL; T— absolute temperature, K; P— atmospheric pressure, kPa (atm); t— time, min; R— gas constant, 82.05 × 101.3 mL (kPa/mol·K) [or 82.05 mL (atm/mol·K)] (A5).

10. Precision

• The determination result is taken as the two results of repeated determination being consistent; if one of them is unqualified, the test is redone (8.2).
• Other precision indicators: not provided in the available source.

11. Report

• Not provided in the available source.

12. Referenced documents

• SH 0114 Aviation washing gasoline (Chapter 2, 4.2.1).

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