Flange, also known as flange plate or flaunching, is used to connect pipes on the end of the pipes. Two pipes, fittings or equipment are mounted with a flange apiece. A flange pad will be put between these two flanges, which are fastened together with bolts. There are also pipes and equipment which come with flanges originally, thus leading to easy connection. Pipes connected with flanges can be disassembled again.
Generally, flange can be easily installed and it can work under high pressure. Hence, it is extensively used for connection in pipeline construction. It is widely applied in many areas such as power generation plant, petroleum industry, natural gas system, chemical industry, shipbuilding industry, heating system, paper-making industry, metallurgy industry, etc.
Flange is often divided into many kinds, which include integral flange, welding neck flange, hubbed slip-on-welding flange, slip-on-welding plate flange, threaded flange, socket welding flange, blind flange, loose flange, orifice flange and spectacle flange, etc.
Major Raw Materials
Carbon steel: ASTM/ASME A234 WPB-WPC
Alloy steel: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP 911
Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H
Low-temperature steel: ASTM/ASME A402 WPL 3-WPL 6
High-performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70
Plate flange features high accessibility of its raw materials, easy manufacturing, low cost and good comprehensive performance.
Threaded flange has its inner bore surface designed as tubular thread, which matches with threaded pipe to achieve connection. Therefore, no welding is required.
Our socket welding flange is designed for pipelines with small diameter and high working pressure. Generally, the diameter is not greater than 40mm and the working pressure shouldn’t exceed 10.0Mpa.
The flange is widely used in many areas such as power generation plant, petroleum industry, natural gas system, chemical industry, shipbuilding industry, heating system, paper-making industry, metallurgy industry, etc.
In terms of connection mode between flange and pipe, flanges falls into five basic categories which are slip-on welding flange, welding neck flange, threaded flange, socket welding flange and loose flange. Loose flange is a combination of two kinds of flanges.
Installed in a closed pipeline, orifice flange is used to test the flow rate of fluid, gas and steam just like a throttling gear. Standard orifice plate is a metal plate with a round hole. Round-hole wall is perpendicular to the front face of orifice plate.
Spectacle flange is made up with two metal discs which are attached to each other by a small section of steel. Its shape is similar to a pair of glasses or "spectacles".
Lap joint flange is similar to hubbed slip-on welding flange, while the difference is that it has a stud end at the intersection between the inner bore and the flange facing, which is used to accommodate the flange pad.