What is the purge pressure of compressed air in industrial pipelines

Analysis of Purge Pressure of Compressed Air in Industrial Pipeline and Adaptability of Grankering Air Compressor

1. The core purpose of industrial pipeline purging
industrial pipelines (such as process pipelines in chemical, food and pharmaceutical industries) shall be purged with compressed air to remove residual welding slag, dust, moisture or impurities after installation or maintenance to ensure the cleanliness of the pipeline and avoid equipment failure or product quality problems caused by pollutants in subsequent processes.

2. General principles and scope of purge pressure
purge pressure should take into account the cleaning effect and pipeline safety, usually follow the following principles:

• lower pressure limit: It should be higher than the normal operating pressure of the medium in the pipeline to ensure that the purging kinetic energy is sufficient to remove impurities;
• upper pressure limit: No more than 1.15 times of the design pressure of the pipeline (refer to the pipeline material, specifications and relevant standards for details) to avoid deformation or damage of the pipeline due to high pressure;
• common range of industry: The purge pressure of general industrial pipelines is mostly set at 0.4-0.8MPa(4-8kg/cm2), which shall be adjusted according to the length, diameter and impurity type of the pipeline (for example, the pressure shall be appropriately increased for long-distance pipelines or stubborn stains).

3. Technical Adaptation Advantages of Granklin Air Compressor
granklin water lubricated single screw air compressor can accurately match the purging requirements of industrial pipelines by virtue of its oil-free, stable and controllable pressure output characteristics:

• pure gas source guarantee: Water lubrication technology is used to replace lubricating oil, and the output air is free of oil pollution, so as to avoid secondary pollution in the pipeline during purging (such as oil pollution attached to the inner wall of the pipeline);
• stable pressure control: The continuous gas supply capacity can maintain the stability of the purge pressure and avoid uneven cleaning effect or pipeline stress changes caused by pressure fluctuations;
• flexible pressure regulation: Through frequency conversion control or pressure regulating valve, the purging pressure (e. g. 0.4-0.8MPa) can be accurately set to adapt to different pipe materials (e. g. stainless steel, carbon steel) and cleaning requirements.

4. Practical recommendations for purging pressure settings

• pipe material adaptation: Thin-walled pipes (such as small-diameter stainless steel) need to reduce the purge pressure to avoid deformation; thick-walled pipes (such as large-diameter carbon steel) can be appropriately increased pressure to enhance the cleaning effect;
• sectional Purging: It is recommended to purge the long-distance pipeline in sections, and the pressure of each section shall be adjusted according to the actual length (for example, the pressure of the pipeline shall increase by 0.1-0.2MPa every 50 meters) to ensure the end cleaning effect;
• pressure verification before purging, the pressure bearing capacity of the pipeline can be confirmed by pressure test (such as hydraulic test), and then the purging pressure can be set; after purging, the air cleanliness at the outlet of the pipeline can be checked by white cloth to verify the effect.

Conclusion
the purging pressure of industrial pipelines needs to balance the cleaning effect and pipeline safety. Granklin water-lubricated single-screw air compressor provides reliable air source support for pipeline purging in different scenarios through the technical characteristics of oil-free, stable and controllable pressure output, helping enterprises to efficiently complete pipeline cleaning and ensure the stable operation of subsequent processes.

(Note: The content of this article is based on technical characteristics and general standard descriptions, and does not involve specific models or third-party brand information.)