1. What is Pipeline Blowing?
Pipeline blowing is a critical pre-commissioning process in chemical plants. It removes contaminants left during construction and installation to ensure safe and stable operation.
In industrial applications, this process is typically supported by:
2. Purpose of Pipeline Blowing
The process removes:
- Sand, dust, debris
- Welding slag and metal particles
- Rust and oxidation layers
- Oil and chemical residues
Key Objectives:
✔ Equipment Protection
Prevents damage to compressors, valves, pumps, and instruments.
✔ Product Quality Assurance
Ensures purity of gases such as nitrogen and oxygen.
✔ Safety Improvement
Reduces risks of explosion, blockage, and overpressure.
3. Common Pipeline Blowing Methods
3.1 Air / Nitrogen Blowing
Uses high-velocity compressed air or nitrogen.
Applications:
- Gas pipelines
- DN < 600 mm
Key Parameter:
- Velocity ≥ 20 m/s
Equipment:
3.2 Steam Blowing
Uses high-temperature steam for cleaning.
Features:
- Thermal expansion enhances cleaning
- Effective for stubborn deposits
3.3 Water Flushing
Uses pressurized water flow.
Key Parameter:
- Velocity ≥ 1.5 m/s
3.4 Advanced Cleaning Methods
- Oil flushing
- Pickling & passivation
- Degreasing (critical for oxygen systems)
4. Acceptance Criteria
Use a white cloth or target plate:
After 5 minutes:
- No dust
- No rust
- No moisture
- No oil
5. Operational Requirements
- System isolation
- Proper blowing sequence
- Safety control
- System restoration
6. Integration with Gas Equipment
Provide high-pressure airflow for effective cleaning.
Ensure safe inert gas cleaning, especially in hazardous environments.
Used in specialized cleaning systems.
7. Conclusion
Pipeline blowing is essential for:
- Equipment protection
- Product quality
- Operational safety
Combining proper methods with reliable gas generation and compression systems significantly improves efficiency and performance.