As the core carrier of oil and gas transportation, petroleum pipelines are prone to residual rust, welding slag, water vapor and flammable gases inside the pipeline before installation, maintenance or commissioning

As the core carrier of oil and gas transportation, petroleum pipelines are prone to residual rust, welding slag, water vapor and flammable gases inside the pipeline before installation, maintenance or commissioning. If not cleaned in time, it will lead to pipeline corrosion, blockage, and even ignition and explosion accidents. With the core advantages of inertness, no residue and no pollution, nitrogen purging of petroleum pipelines has become a universal pipeline pretreatment process in the petroleum industry. It is a key link to ensure the safety of oil and gas transportation and extend the service life of pipelines, widely used in the whole scenario of crude oil and natural gas pipeline construction and operation and maintenance.

The core role of petroleum pipeline nitrogen purging is the dual empowerment of "cleaning + protection". On the one hand, high-pressure air flow of high-purity nitrogen is used to comprehensively purge the inside of the pipeline, thoroughly remove residual impurities, welding slag and moisture, avoid pipeline blockage and valve wear caused by impurities, and eliminate pipeline inner wall corrosion caused by water vapor, clearing obstacles for oil and gas transportation. On the other hand, as an inert gas, nitrogen can effectively replace the air and flammable gases in the pipeline, reduce the oxygen concentration in the pipeline, and eliminate the safety hazards caused by flammable gases encountering open flames during construction and commissioning, building a solid safety barrier for pipeline construction and later operation.

During the construction process, it is necessary to strictly follow GB 50235-2010 "Code for Construction of Industrial Metal Piping Engineering" to ensure compliant and efficient purging. Select high-purity nitrogen with a purity of more than 99.99%, accurately control the purging pressure and flow according to the pipeline diameter and length, avoid damage to pipeline interfaces due to excessive pressure; adopt the method of segmented purging and step-by-step detection to ensure that impurities and water vapor in the pipeline are completely removed. After qualified purging, seal the pipeline port in time to prevent secondary pollution. At the same time, construction personnel must hold certificates to work, do a good job in safety protection, monitor nitrogen concentration throughout the process, and eliminate the risk of asphyxiation caused by nitrogen leakage.

The core value of nitrogen purging lies not only in ensuring the safe commissioning of pipelines, but also in reducing later operation and maintenance costs. Petroleum pipelines that have been standardized purged can reduce pipeline corrosion, blockage and other faults, reduce the frequency of shutdown maintenance, and extend the service life of pipelines by 5-10 years. At the same time, nitrogen has no residue and no pollution, no need for subsequent treatment, which conforms to the green, safe and efficient development requirements of the petroleum industry, and helps enterprises meet the requirements of safe production compliance.