Pneumatic fluid power. Compressed-air lubricators. Test methods to determine the main characteristics to be included in supplier's literature
1Key Takeaways
What is ISO 6301 ‑ 2 about? ISO 6301 is a series of international standards on compressed-air lubricators that discusses the characteristics and specifications of compressed-air lubricators useful for pneumatic fluid power systems . ISO 6301 ‑ 2 is the second part of a series of documents…
2Expert Interpretation
An in-depth analysis of the test methods for compressed air lubricators in BS ISO 6301-2:2018, including the professional testing procedures and technical requirements for core indicators such as rated pressure verification, air flow testing, and minimum operating flow determination.
Standard Technical Evolution and Background
As the second part of the ISO 6301 series of standards, the 2018 edition replaces the 1997 edition, primarily updating normative references and technically revising test methods. This standard forms a complementary framework with ISO 6301-1, "Requirements for supplier documentation characteristics of compressed air lubricators."
Analysis of Core Test Methods
| Test Items | Test Conditions | Key Parameters | Judgment Criteria |
|---|---|---|---|
| Rated Pressure Verification | 1.5~5 times rated pressure | 23±5°C, ISO VG 32 lubricating oil | No leakage/structural failure |
| Air Flow Test | 250/630/1000kPa | Pressure Differential ≤80kPa or 20% of inlet pressure | Flow-Pressure Drop Curve |
| Minimum Operating Flow | 630kPa constant pressure | Oil drop rate ≥ 1 drop/5dm³/s | 60mg/m³ oil mist density |
Key points of the key test process
1. Structural strength verification
Adopt stepped pressurization method:
- Initial pressurization to 1.5 times the rated pressure and hold for 2 minutes
- Increase by 0.5 times the rated pressure each time until 4-5 times (depending on the material)
- Judgment standard is that the pressure vessel shell has no leakage, cracks or structural separation
2. Flow characteristic test
Establish a test circuit in accordance with ISO 6358-1, paying special attention to:
Implementation Recommendations
Test Sample Management
The standard requires at least 3 random samples for each test. It is recommended that:
- Sampling from different production batches
- Perform 24-hour environmental acclimatization before testing
- Record the sample serial number and material certificate
Data Recording Specifications
The test report should include:
- Test environment temperature and humidity records
- Calibration certificate number of the pressure sensor
- Oil viscosity test report (must comply with ISO 3448 VG32)
- Visual documentation of failure mode (if it occurs)