Views: 102 Author: Good Du Publish Time: 2023-03-28 Origin: Site
Socket elbow is a high-pressure elbow pipe connection fitting, which is formed by die-forged billet of round steel or steel ingot and then processed by lathe. It is one of the forged socket series fittings. Socket elbow is composed of socket, bell end, bending part and socket slot. It is characterized by socket slot on the socket, which is located at both ends of the bending part. Socket elbows are mainly used in petrochemical, medical and health, electric power, aerospace, military, fire control, metallurgy, shipbuilding, gas, nuclear power, environmental protection and other departments and fields requiring high pressure and precise dimensions.
|DN||Nom.Pipe Size||Center to Bottom of Socket-A||Socket Bore Dia.-B||Bore Dia.Of Fitting-D||Socket Wall Thickness(2)-C||Body Wall Thickness-G||Depth of Socket Min.J|
|90°Elbows ||Class Designation||Class Designation|
|Class Designation||Class Designation||3000||3000|
Material of 90 Degree Socket Elbow
|Carbon Steel||ASTM A105 / A105N, ASTM A350 LF2/LF3, A694 F42 / 46 / 56 / 60 / 65|
|Alloy Steel||ASTM A182 F11 / F12 / F5 / F9 / F91 / F92 / F22|
|Stainless Steel||ASTM A182 F304/304L/304H, F316/316L, F310S, F317, F347, F904L|
Difference Between SW Elbow and BW Elbow
Small diameter pipes mostly use socket weld elbows, which are generally suitable for pipes under the size DN50. Butt weld elbows are usually used for large diameter pipes.
Socket weld elbows are joined by fillet welds, butt weld elbows are joined by welds. According to the analysis results of welding compressive strength and support conditions, butt-welded joints are superior to socket joints, so butt-welded joints should be selected where working pressure is usually high. Grooves are required for butt weld elbow connections and socket welds do not require grooves and can be welded horizontally directly with the elbow.
After welding elbows, 100% flaw detection test shall be carried out to ensure no leakage. Socket welding is not required. X-ray inspection shall be done for butt welding and penetration inspection shall be done for socket welding. If the requirement of fluid mechanics in pipeline for electric welding is not high, socket welding elbow is recommended for convenient inspection.
Socket elbows cost more than butt weld elbows, but butt weld elbows cost more on labor costs for welding.
How to Select SW Elbow or BW Elbow for the Connecting?
Piping diameters in your system.
Type of fluid in the system.
Wall thickness to determine whether beveling is possible or not.