The LNG submarine pipeline technology solution developed by the Pipeline Bureau has obtained China’s first AIP certificate for LNG submarine pipelines

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On March 23, reporters learned from the Pipeline Bureau Design Institute that the LNG submarine pipeline technology plan developed by its Bohai Branch has been approved by the Marine Engineering Technology Center of the China Classification Society (CCS), earning it the country’s first AIP certificate for LNG submarine pipelines. This marks professional recognition of the Pipeline Bureau’s LNG submarine pipeline technical solution in terms of technical compliance, safety, and reliability. In response to the ultra-low temperature conditions associated with LNG and the complex environmental conditions in shallow offshore areas, the Bohai Branch of the Pipeline Bureau’s Design Institute carried out work on pipeline structure design, analysis of low-temperature mechanical properties, and operational safety assessment, ultimately developing a comprehensive and verifiable technical solution for LNG submarine pipelines. This solution adopts a double-layer steel pipe structure with separate inner and outer pipes, ensuring both the stable transportation of low-temperature media and the safety of the pipelines ； By combining vacuum insulation technology with aerogel materials, heat loss during LNG transportation is significantly reduced, ensuring the efficiency of ultra-low temperature transport ； Taking into account the special conditions in shallow and coastal waters, various technical solutions have been developed to address challenges such as external pressure and temperature fluctuations, thereby enabling the system to exhibit strong adaptability and long-term operational stability in complex marine environments. This provides technical support and a model for LNG transport projects off the coast of China. The AIP certificate represents the principle approval by the Marine Engineering Technology Center of the China Classification Society (CCS) for the conceptual design of innovative technologies, and it plays an irreplaceable and important role in promoting technological innovation, reducing technical risks, and accelerating the commercialization of new technologies.