Introduction to Large Diameter Flanged Welding Flanges

Large Diameter Flanged Flat Welding Fittings, as the name implies, are flanged flat welding fittings used on pipelines with larger diameters.

Large diameter flanged socket weld flanges are mainly manufactured by CNC lathes, semi-automatic lathes, and drilling machines.

Model and Specifications

DN15-DN1000

Pressure Grade

PN6-PN100

Sealing Surface Type

Rounded Face (RF), Flat Face (FF), Milled Face (MFM), Concave Face (FM), Milled (M), Tongue and Groove (TG)

The concavo-convex flanged flat weld (MFM) is for matching use.

Large-diameter flanged socket weld flange material

Carbon steel, stainless steel, alloy steel

Compliance Standards

Flat Flanged Welding Steel Pipe Fitting - GB9116

Oval Flanged Flat-Welded Steel Pipe Flanges - GB9116

Chemical Industry Standard: HG/T20592-2009

National Standard: GB/T 9116-2010

Connection Type

Single-sided welding, double-sided bolted, similar to the connection form of flat welding flanges.

Production Process

Overall forging or rolling; for particularly large flanged flat welds, only the rolling process can be used for production.

Large Diameter Flanged Welding Flange Applications

Chemical, power, wastewater treatment, wind power, municipal, aerospace, and nuclear industries all utilize large diameter flat welding flanges where extensive pipelines or large pressure vessels are present.

Procurement Recommendations

1: It's recommended to purchase from a regular necked flat welding flange manufacturer, which should have a certain production scale.

2: Manufacturers of flanges need to provide material inspection reports and other relevant documents for flange plates.

3: Flange plates must have corresponding specification model embossed and marked.