Forged Steel Flange Application
Forged flanges are used as a connection component for pipes, valves, pumps and other equipment to form a pipework system. They provide easy access for cleaning, inspection, modification or repairs. Flanges are usually welded onto pipes or screwed onto a threaded pipe end and then joined with bolts to make the connection. The types of flanges are described and shown below:
Weld Neck Flange
Weld neck flanges are circumferential welded at the neck where the integrity of the butt welded area can be easily examined by radiography. The bores of both pipe and flange match, which reduces turbulence and erosion inside the pipeline. The weld neck is therefore durable in critical applications.
Slip-on flanges are fitted over the pipe and then fillet welded. Slip-on flanges are easy to use in fabricated applications.
Blind flanges are used to blank off pipelines, valves and pumps. They can also be used as an inspection cover. It is sometimes referred to as a blanking flange.
Socket Weld Flange
Socket weld flanges are counter-bored to accept the pipe before being fillet welded. The bore of the pipe and flange are both the same to provide good flow characteristics.
Threaded flange are referred to as either threaded or screwed. They are used to connect other threaded components in low pressure, non-critical applications. No welding is required.
Lap Joint Flange
Lap joint flanges are always used with either a stub end or taft which is butt welded to the pipe with the flange loose behind it. This means the stub end or taft always makes the face. A lap joint is used in low pressure applications because it is easily assembled and aligned. To reduce costs, these flanges are supplied without a hub.
Ring Type Joint Flange
Ring type joint flanges are used to ensure a leak proof flange connection at high pressures. A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal. This jointing method can be employed on Weld Neck, Slip-on and Blind Flanges.
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