A flange connects pipes and equipment, facilitating easy assembly and disassembly. Types include weld neck, slip-on, threaded, socket weld, lap joint, and blind, available in round, square, and rectangular shapes. Sizes follow standard diameters and pressure ratings. Common materials are stainless steel, carbon steel, alloy steel, and copper alloy.
Introduction to Flanges
A flange is a mechanical component used to connect pipes, valves, pumps, and other equipment to form a piping system. Flanges provide convenient points for assembly and disassembly, ensuring efficient operation of the piping system. Below is a detailed introduction to flanges in terms of types, shapes, and sizes.
Main Types of Flanges
Weld Neck Flange:Designed for butt welding to pipes, featuring a long tapered neck, suitable for high-pressure and high-temperature environments.
Slip-on Flange:This flange slides over the pipe and is then welded in place, offering easy installation but lower pressure handling.
Threaded Flange:Features threads, allowing it to connect with threaded pipes, ideal for low-pressure and small-diameter piping systems.
Socket Weld Flange:The pipe is inserted into the socket end and then welded in place, suitable for small diameter and high-pressure pipes.
Lap Joint Flange:Used with a lap joint stub end, ideal for systems requiring frequent disassembly.
Blind Flange:Used to close off the end of a piping system or a pressure vessel opening, with no opening for flow.
Flange Shapes
Round Flange:The most common shape, suitable for most piping systems.
Square Flange:Mainly used for special requirements and customized piping systems.
Rectangular Flange:Often used in specific industrial applications, such as heat exchangers and piping bridges.
Common Flange Sizes
Flange sizes include nominal diameter, pressure rating, thickness, and bore size. They mainly follow these standards:
Nominal Diameter (DN):Refers to the nominal bore of the pipe, commonly ranging from DN10 to DN2000.
Pressure Rating:The maximum pressure a flange can withstand, with common ratings including PN6, PN10, PN16, PN25, and PN40.
Thickness and Bore Size:Defined according to standards such as ANSI, ASME, DIN, and JIS to ensure compatibility with pipes and equipment.
Materials
Stainless Steel:Examples include 304 and 316, suitable for corrosive environments.
Carbon Steel:Examples include A105, suitable for high-strength and high-temperature environments.
Alloy Steel:Examples include Cr-Mo alloy steel, suitable for high-pressure and high-temperature environments.
Copper Alloy:Examples include brass and bronze, used for specific industrial applications.
