Blind Flange is also called BL flange. There is no hole in the center, and the function is to close or isolate the pipeline. Mainly used for pipe ends or as heads. Blind flange can be used in an existing operation flow, or for future expansion requirements. It also permits easy access to the interior of a line or vessel, once it has been sealed and must be reopened. RF blind flange normally use for PN0.25 to PN25.0, RTJ blind flange normally use for high pressure pipeline which from PN6.3 to PN25.0;