Distinguishing Between Flanges and Blind Flanges

Pipes are typically joined using a component known as a flange. However, while flanges are commonly heard, specific knowledge differentiating them from blind flanges may be lacking. Hence, we've curated relevant information for you. Let's explore together!

The Distinction Between Flanges and Blind Flanges

They possess distinct characteristics:

The standard term for a flanged blind pipe is a flange cover, also known as a blind flange or occluded pipe. It's a flange devoid of a central hole primarily used to seal the pipe's end. Functionally, it serves the same purpose as a sealing head or tube cap. Blind hole seals are detachable closures where the seal cannot be readily opened again.

Flange blind pipes can be crafted from various materials, including carbon steel, alloy, stainless steel, and plastic. The performance of blind flanges varies depending on the material used.

Plastic blind pipe flanges offer good corrosion resistance but exhibit poor strength. Stainless steel flange blind pipes present notable advantages in systems that require complete separation for isolation.

The flanged blind pipe consists of a solid body with a handle, typically used conveniently in its default state within isolation systems. During flange connections, bolts secure the flanges in place. Flanges are sealed with gaskets or serve temporarily in testing procedures. Commonly found in plumbing engineering, flanges are disk-shaped components typically used in pairs, depending on the connection method. They are further categorized into threaded, welded, and clamp flanges.

The two have different applications:

• Flange due to its good performance characteristics. Widely used in pipeline, chemical, sanitary, petroleum, construction, fire protection, and other basic projects.

• In the piping strength test or sealing test, the blind pipe in the original start-up preparation stage cannot be used with the connecting equipment (such as turbine, compressor, gasifier, reactor, etc.). Blind pipes must be installed at the connection between equipment and piping. When the equipment is stopped, please set a dead pipe on the shut-off valve.

There is a big difference between flanges and flanged blind pipes in the actual use process. These two flanges are suitable for different use environments and should not be confused. I hope these contents can help you better understand flanges so that you can fully use them during construction to avoid leakage.

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