1. What are the standard hydrotest procedures for boiler tubes?
Test pressure typically 1.5x design pressure. Water temperature above 15°C to avoid brittleness. Gradual pressure increase (≤70 bar/min). Minimum 30 minute hold time. Visual inspection during test.
2. How does pneumatic testing differ from hydrotesting?
Uses compressed gas instead of water. Higher risk due to stored energy. Required when water cannot be removed. Stricter safety precautions apply. Limited to lower pressure systems.
3. What are the advantages of automated pressure testing systems?
Precise pressure control and monitoring. Digital recording of test parameters. Automatic leak detection capabilities. Reduced human error. Data integration with quality systems.
4. How should test pressure be determined for aged tubes?
Based on current thickness measurements. Reduced factors for material degradation. May require strain gauging for verification. Engineering assessment for remaining strength. Often 1.25x MAWP rather than 1.5x.
5. What safety precautions are essential for pressure testing?
Barricaded test area with warning signs. Remote pressure monitoring. Proper venting arrangements. Pressure relief devices installed. Trained personnel only present.
