Flange, also called flange plate or flange

Flange is a part that connects shafts to each other, and is used for the connection between pipe ends; it is also used as a flanges on the inlet and outlet of equipment for the connection between two equipment, such as a reducer flanges.
Flange connection or flange joint refers to a detachable connection in which flanges, gaskets and bolts are connected to each other as a set of combined sealing structures. Pipe flange refers to the flange used for piping in the pipeline device, and when used on equipment, refers to the inlet and outlet flange of the equipment. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets. Flanges are divided into threaded connection (threaded connection) flange, welding flange and clamping flange. Flanges are always used in pairs, low-pressure pipelines can use wire flanges, and welding flanges can be used with pressures above four kilograms. And a sealing gasket between the two flanges and tighten them with bolts. Flanges of different pressures have different thicknesses and use different bolts. When water pumps and valves are connected to pipelines, some parts of these equipment are also made into corresponding flange shapes, also called flange connection. Any connecting parts that are closed together by bolts on the two planes at the periphery are generally called “flanges”, such as the joints of ventilation ducts. This kind of parts can be called “flange parts”.

Chinese name: Flange
Alias: flange flange disk or flange
Material: carbon steel, low alloy steel, stainless steel, etc.
Category: Mechanical parts
Scope of application: construction, light and heavy industry, plumbing, electricity, etc.
Category level: International Domestic
Classification: Classified according to HG, SH, JB and GB standards

Flange Classification:

1. According to chemical (HG) industry standards: integral flange (IF), threaded flange (Th), plate flat welding flange (PL), neck butt welding flange (WN), neck flat welding flange (SO), socket welding flange (SW), butt welding ring loose flange (PJ/SE), flat welding ring loose flange (PJ/RJ), lined flange cover (BL(S)), Flange cover (BL)
2. According to petrochemical (SH) industry standards: threaded flange (PT), butt welding flange (WN), flat welding flange (SO), socket welding flange (SW), loose collar flange (LJ) , flange cover.
3. According to machinery (JB) industry standards: integral flange, butt welding flange, plate flat welding flange, butt welding ring plate loose flange, flat welding ring plate loose flange, flanged ring plate loose flange Flange, flange cover.
4. According to national (GB) standards: integral flange, threaded flange, butt welding flange, neck flat welding flange, neck socket welding flange, butt welding ring neck loose sleeve flange, plate flat flange Welding flange, butt welding ring plate loose flange, flat welding ring plate loose flange, flanged ring plate loose flange, flange cover.

Material：

WCB (carbon steel), LCB (low temperature carbon steel), LC3 (3.5% nickel steel), WC5 (1.25% chromium 0.5% molybdenum steel), WC9 (2.25% chromium), C5 (5% chromium 0.5% molybdenum), C12 (9% chromium 1% molybdenum), CA6NM (4 (12% chromium steel), CA15(4) (12% chromium), CF8M (316 stainless steel), CF8C (347 stainless steel), CF8 (304 stainless steel), CF3 (304L Stainless steel), CF3M (316L stainless steel), CN7M (alloy steel), M35-1 (Monel), N7M (Hastel B), CW6M (Hastel C), CY40 (Inconel) wait.

Stainless Steel Flanges	ASTM A 182, ASTM A240 304, 304L, 304H, 309, 310, 310S, 316, 316Ti, 316 S33, 316L, 317, 317L, 321, 347, 347H, 409, 410, 410S, 420, 430
Duplex Steel Flanges	Duplex F51 2205 UNS S31803, Super Duplex 2507 (UNS S32750), F55 (UNS S32760)
Carbon Steel Flanges	ASTM A234, ASTM A105, ASTM A106
Monel Flanges	UNS 4400 (Monel 400), Monel 500
Inconel Flanges	UNS 6600 (Inconel 600), UNS 6601 (Inconel 601), UNS 6625 (Inconel 625), Incolloy 800,  UNS 8825 INCONEL (Incolloy 825)
Others Grades Flanges	ASTM / ASME SB 564 UNS 2200 ( NICKEL 200 ) Hastelloy 904, NICKEL 200

Connection Method

Flange connection is to fix two pipes, pipe fittings or equipment on a flange plate first, add flange pads between the two flange plates, and fasten them together with bolts to complete the connection. Some pipe fittings and equipment already come with flanges, which are also flange connections. Flange connection is an important connection method in pipeline construction. Flange connections are easy to use and can withstand greater pressure. In industrial piping, as well as in homes, the pipe diameter is small and low pressure, with no visible flange connections. If you are in a boiler room or production site, there are flange-connected pipes and equipment everywhere.

According to the Connection Method

flange connection types can be divided into: plate flat welding flange, neck flat welding flange, neck butt welding flange, socket welding flange, threaded flange, flange cover, neck butt welding ring Loose sleeve flange, flat welding ring loose sleeve flange, ring grooved surface flange and flange cover, large diameter flat flange, large diameter high neck flange, eight-shaped blind plate, butt welding ring loose sleeve flange, etc.

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