flange
A blind flange (BL flange, blank flange) is simply a solid circular disc with bolt holes. It has no bore and no raised face—just a forged flat plate that is bolted between two flanges to shut off fluid flow, isolate a pipeline, or provide an access port for pressure testing. Because it is initially manufactured as a forged blind flange blank, with grain flow extending through the entire thickness, its pressure rating is fully compatible with the corresponding weld-neck or slip-on flange—except that, in this case, fluid flow has been completely stopped.
A plate flange (PL flange or flat flange) is a flat, circular forged component featuring a central bore and a ring of bolt holes. It can be simply slipped over the pipe and welded on both sides to achieve a secure seal—no raised face or neck is required; only a single flat flange is needed, making installation straightforward and cost-effective. Note: Plate flanges are perforated and used for connecting pipelines; blind flanges (BL) are solid and serve to shut off fluid flow. Use a PL flange when connection is required, and a BL flange when isolation is needed.
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