What Is a Flange Plate?

A flange is simply referred to as a flange, but it is a collective name. Generally, it refers to opening several fixing holes on the periphery of a disk-like metal body for connecting other things. This thing is widely used in machinery, so it looks strange, as long as it looks like a flange, its name is derived from English flange.

Flange

The flange is also called flange or flange plate.

The part that connects the pipe to the pipe is connected to the pipe end. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets.

Depending on the level of stress,

Several systems of international pipe flange standards

1. Flange connection or flange joint refers to the detachable connection of flange, gasket and bolt connected to each other as a group of combined sealing structures. Pipe flange refers to the flange used for piping in pipeline installations. On the equipment is the inlet and outlet flanges of the equipment.

2. Several systems of international pipe flange standards

1.DIN standard

1) Common pressure levels: PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250

2) Flange sealing surface: raised face DIN2526C

Plate type flat welding flange

Flat neck welding flange

With neck butt welding flange

Socket welding flange

Threaded flange

Flange cover

Blind plate

With neck

Flange connection is to fix two pipes, pipe fittings or equipment respectively on a flange plate, and add flange pads between the two flange plates, and fasten them with bolts to complete the connection. . Some pipe fittings and equipment already have flanges, which are also flange connections. Flange connection is an important connection method for pipeline construction.

The flange connection is easy to use and can withstand large pressures. The flange connection is widely used in industrial pipelines. In the home, the pipe diameter is small and the pressure is low, so the flange connection is not visible. If in a boiler room or production site, flanged pipes and equipment are everywhere.

National standard: GB / T9112-2000 (GB9113 · 1-2000 GB9123 · 4-2000)

American Standard: ANSI B16.5 Class150, 300, 600, 900, 1500, 2500 (WN, SO, BL, TH, LJ, SW) ANSI B16.47, ANSI B16.48

Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW)

German standard: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634, 2545 (PL, SO, WN, BL, TH)

Standards of the Ministry of Chemical Industry: HG5010-52 HG5028-58, HGJ44-91 HGJ65-91, HG20592-97 series, HG20615-97 series

Machinery Department Standards: JB81-59 JB86-59, JB / T79-94 JB / T86-94, JB / T74-1994

The materials of the flange are: stainless steel plate, carbon steel plate, alloy plate, aluminized zinc plate, stainless steel rod, stainless steel forging, stainless steel profile, etc.

Material: Forged steel, WCB carbon steel, stainless steel, 316L, 316, 304L, 304, 321, chromium molybdenum steel, alloy steel, chromium molybdenum vanadium steel, molybdenum titanium, rubber lining, fluorine lining.

It consists of a pair of flanges, a gasket and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After tightening the nut, the specific pressure on the gasket surface will deform when it reaches a certain value, and fill up the unevenness on the sealing surface to make the connection tight. The flange connection is a detachable connection. According to the connected components can be divided into container flanges and pipe flanges.

The flanges are divided according to the structure type, including integral flanges, looper flanges and threaded flanges. Common integral flanges include flat welding flanges and butt welding flanges. The flat welding flange has poor rigidity and is suitable for the occasion of pressure p4MPa. Butt welding flanges are also called high neck flanges. They are divided into flat welding with neck and butt welding with neck. High rigidity, suitable for occasions with high pressure and temperature. There are three types of flange sealing surface: flat sealing surface, suitable for occasions with low pressure and non-toxic medium; concave and convex sealing surface, suitable for occasions with slightly higher pressure; tongue and groove sealing surface, suitable for flammable and explosive , Toxic media and high pressure occasions.

High pressure flange

Butt welded steel pipe flange

Flanges on CNC Gantry Milling Machines

Plate type flat welded steel pipe flange

Blind plate

Flanges on small gantry milling machines

Large flange

Threaded flange

Flat welding flange with neck

Rolled flange semi-finished products