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The flange is a flanged part. Flanges can be separate, called flanges, or they can be combined, such as flanges on both ends of a valve, to facilitate bolting. First, the steel pipe flange China Machinery Industry Standard flange connection JB / T 74-1994 Pipe flange technology JB / T 75-1994 Pipe flange type JB / T 79.1-1994 convex overall cast pipe method Lan JB / T 79.2-1994 concave and convex overall cast steel flanges JB / T 79.3-1994 tongue and groove surface of the overall cast steel flange JB / T79.4-1994 ring connecting the overall cast steel flange JB / T 81 -1994 convex flat welded steel pipe flange JB / T 82.1-1994 convex butt welded steel pipe flange JB / T 82.2-1994 concave and convex face to be welded steel pipe flange JB / T 82.3-1994 mortise groove Faced with welded steel pipe flange JB / T 82.4-1994 ring welded steel pipe flange face JB / T 83-1994 flat ring plate loose tube steel pipe flange JB / T 84-1994 convex face Welding ring plate loose tube steel pipe flange JB / T 85-1994 Flange loose tube steel pipe flange JB / T 86.1-1994 convex steel pipe flange cover JB / T 86.2-1994 corrugated steel pipe Flange cover Second, the steel pipe flange China National Standard flange connection flange GB / T 9112 ~ GB / T 9124-2000 Steel pipe flanges, the flange of the overall steel pipe flange sealing surface in the form of plane, the sudden Surface, convex surface, tongue and groove surface and ring connection surface. GBT 9112-2000 steel pipe flange type and parameters GBT 9113.1-2000 plane, convex surface overall steel pipe flange GBT 9113.2-2000 convex surface of the whole steel pipe flange GBT 9113.3-2000 tongue and groove of the overall steel pipe method Flange GBT 9113.4-2000 ring connecting the overall steel pipe flange GBT 9114-2000 protruding face with a threaded pipe flange GBT 9115.1-2000 flat, butt welded steel pipe flange GBT 9115.2-2000 convex face Welded steel pipe flange GB / T 9115.3-2000 Facing butt welded steel pipe flange GB / T 9115.4-2000 Ring connecting face butt welded steel pipe flange GB / T 9116.1-2000 plane, convex surface with neck Flat welded steel pipe flange GB / T 9116.2-2000 concave and convex with neck flat welded steel pipe flange GB / T 9116.3-2000 tongue and groove surface with flat welded steel pipe flange GB / T 9116.4-2000 Ring connection Flange with flat neck steel pipe flange GB / T 9117.1-2000 Raised face with neck socket Welded steel pipe flange GB / T 9117.2-2000 concave and convex with neck socket welding steel pipe flange GB / T 9117.3 -2000 tongue and groove face with socket welding steel pipe flange GB / T 9117.4-2000 Ring connecting face with neck socket welding steel pipe flange B / T 9118.1-2000 Bucking face with neck loose steel Pipe flanges GB / T 9118.2-2000 Connecting the face of the welded ring neck loose tube steel pipe flange GB / T 9119-2000 flat, convex plate flat welded steel pipe flange GB / T 9120.1-2000 protruding face butt ring plate loose tube steel pipe method Flange GB / T 9120.2-2000 concave and convex facing the plate plate loose steel pipe flange GB / T 9120.3-2000 mortise facing the ring plate loose tube steel pipe flange GB / T 9121.1-2000 salient flat welding Ring plate loose tube steel pipe flange GB / T 9121.2-2000 concave and convex flat-plate ring loose steel pipe flange GB / T 9121.3-2000 tongue and groove flat plate ring loose steel pipe flange GB / T 9122-2000 flange ring plate loose pipe flange GB / T 9123.1-2000 flat and convex steel pipe flange cover GB / T 9123.2-2000 convex and concave steel pipe flange cover GB / T 9123.3- 2000 tongue and groove surface steel pipe flange cover GB / T 9123.4-2000 ring connecting surface steel pipe flange cover GB / T 9124-2000 steel pipe flange technical conditions Third, the steel pipe flange Chinese chemical industry valve connection Flange Standard European System Steel Pipe Flange HG Steel Pipe Flange Type, Parameter HG Flat Flange Steel Pipe Flange HG Flat Flange Steel HG 20595- 1997 neck welded steel pipe HG Integral steel pipe flange HG Socket Welded steel pipe flange HG Rebar steel pipe flange HG Bimetallic welded steel pipe flange HG 20600- 1997 Flat welded ring loose tube steel pipe flange HG Steel pipe flange cover HG Stainless steel liner flange cover HG Steel pipe flange technical conditions HG Steel pipe flange Pressure - Temperature Class HG Steel Pipe Flanges Welded Joints and Grooves Sizes Americas System Steel Pipe Flange Standard HG Steel Pipe Flange Type, Parameter HG Pipe with Flattened Steel, Flange HG Butt welded steel pipe flanges HG Whole steel pipe flanges HG Butt welded steel pipe flanges HG Rebar steel pipe flanges HG 20621- 1997 Butt welded ring loose tube steel pipe flange HG Steel pipe flange cover HG Large diameter steel pipe flange HG Steel pipe flange technical conditions HG Steel pipe Flange pressure - Temperature class HG Steel pipe flange welded joints and groove size Copper alloy and composite flange Standard GB / T 15530.1-1995 Copper alloy Body casting flange GB / T 15530.2-1995 Copper alloy butt welding flange GB / T 15530.3-1995 Copper alloy plate welding flange GB / T 15530.4-1995 Copper alloy neck welding flange GB / T 15530.5-1995 Copper Alloy flat welded ring loose plate steel flange GB / T 15530.6-1995 Copper alloy welded ring loose plate steel flange GB / T 15530.7-1995 Copper alloy flange cover GB / T 15530.8-1995 Copper alloy and composite flange Technical conditions Fittings for pipe flange connection HG Fasteners for steel pipe flanges (European system) HG Fasteners for steel pipe flanges (American system) SH 3404-1996 Pipe method Blue with fasteners Fourth, the steel pipe flange China Petrochemical Industry Standard flange valve connection flange nominal pressure grade nominal size size range flange connection and sealing surface form the nominal diameter DN ≤ 600mm flange connection nominal diameter DN ≥ 600mm flange structure and size loose flange nominal pressure PN5.0 ≥ MPA concave and convex surface, tongue and groove face flange sealing surface of the form and size of flange and carbon steel, low alloy steel and stainless steel connection size nominal Diameter DN> 60mm in the form of flange size flange bolt hole and the structure and size of the structure Lan takeover welded structure with dimensions: nominal diameter welded flange DN≤600mm