After passing the strength test and before the air pressure tightness test, steel pipelines should be flushed and purged as required.
Over the years, water flushing, air blowing, steam blowing and other techniques are mainly used for flushing and blowing. For small diameter pipelines this is more effective, for larger diameter pipelines often due to the flow rate of the blowing medium does not meet the requirements of the provisions and does not achieve the ideal blowing effect. As pipeline accessories and instruments are becoming more and more advanced, the technical requirements of the production process continue to improve, some construction techniques can no longer meet the construction requirements. In the construction of large diameter steel pipeline blowing and flushing, blasting blowing method is replacing the other construction methods used in the past.
Blast blowing is to be blown at one end of the pipe with a much lower strength than the pipe rupture disc closed, the other end into the compressed air. The pressure of the air in the system gradually rises, and when it exceeds the limit pressure that the rupture disc can withstand, the rupture disc suddenly ruptures and the compressed air in the system instantaneously and rapidly expands from the rupture mouth at a very high rate. At the same time, the welding slag and other debris in the pipeline in the role of vibration caused by the blast and the impact of high-speed airflow is also discharged, repeated several times, you can achieve the requirements of blowing.
DEAR air separation production small air separation unit, large air separation unit and liquid air separation plant and oxygen piping are strictly enforced process specifications, pipeline production and installation to ensure that the overall small air separation unit, large air separation unit and liquid air separation plant high quality requirements.
