Plate type flat welding flange, also known as flat plate flange or lap welding flange, is a flange that inserts a pipeline into a flange hole and connects it to equipment or pipeline through a fillet weld. The connecting surface is usually flat or protruding. During installation, the two flanges are fixed with bolts and nuts, and a gasket is placed in the middle to achieve sealing.

Execution standard

Common implementation standards include chemical standard HG20592, national standard GB/T9119, mechanical standard JB/T81, etc.

Pressure rating

There are pressure levels available PN6（0.6MPa）、PN10（1.0MPa）、PN16（1.6MPa）、PN25（2.5MPa）、PN40（4.0MPa） Wait, the highest can reach PN250 (25.0MPa).

Material

Mainly including carbon steel (such as Q235B, 20 #, etc.), stainless steel (such as 304, 316L, etc.), and alloy steel (such as 12Cr1MoV, 15CrMo, etc.).

Feature

Advantages: Convenient material selection, simple manufacturing, low cost, relatively easy installation and disassembly, good comprehensive performance, and wide application.

Scope of application

Widely used in basic engineering such as chemical, construction, water supply, drainage, petroleum, light and heavy industries, refrigeration, sanitation, plumbing, fire protection, electricity, aerospace, shipbuilding, etc.

Welding form

The welding method is single-sided welding with double-sided nut connection, which involves inserting the pipe into the flange and welding it on the outside of the flange.