Abstract: This paper mainly introduce the LNG piping flange joint installation technology and management requirements, in order to function modules operating in the later production, maintenance, and any modification work can manage the flange node data maintenance and ensure the integrity of the flange joint . The leakage accident of flange connection system will cause inestimable great economic loss, so the effective management of flange installation is an important link to avoid leakage in the use process. Flange integrity management is for all fixed flange joints and should not be damaged intentionally during construction. This paper mainly introduce how the pipe system in the precast construction joint of flange management right, from the applicable scope, process principle, construction process, operating key points, main equipment and materials, quality control and so on several parts is introduced, to guide the construction process of flange connection.