ASME B16.5 RF Socket Weld Flange
ASME B16.5 RF Socket Weld Flange
Followings are the definition, information and application of various types of flanges:
Socket weld flanges were initially developed for use on small-size high pressure piping.Their static strength is equal to Slip On flanges,but their fatigue strength 50% greater than double-welded slip on flanges.
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Type |
Weld Neck,Slip On,Socket Weld,Threaded,Lap Joint,Blind etc |
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Size |
1/2”-96” |
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Face |
America Series:Flat face(FF),Raised face(RF),Tongue(T),Groove(G),Female(F),Male(M),Ring type joints face(RJ/RTJ) Europe Series:Type A(Flat Face),Type B(Raised Face),Type C(Tongue),Type D(Groove),Type E(Spigot),Type F(Recess),Type G(O-Ring Spigot),Type H(O-Ring Groove) |
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Pressure |
America Series: Class 150 ,Class 300, Class 600, Class 900A ,Class 1500,Class 2500. Europe Series: PN2.5,PN6,PN10,PN16,PN25,PN40,PN63,PN100,PN160,PN250,PN320,PN400. |
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Standard |
ASME/ANSI B16.5,ASME B16.47,ASME B16.36,AWWA C207.DIN 2527,2573,2576,2631,2632,2633,2634,2635,2566,2642.EN 1092,BS 4504,JIS B2220,GOST 10820,10821 etc. |
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Material |
Carbon Steel:ASTM A105,A350 LF2,SS400,P235GH,P250GH,C22.8,Q235,20#,16Mn. |
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Stainless Steel:ASTM A182 F304,F304L,F316,F316L,F321,F347,F310,F44,F51 etc. |
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Alloy Steel:ASTM A694 F42,F46,F52,F56,F60,F65,F70,A182 F5,F9,F91,F12,F11,F22 etc |
Advantages of Socket Weld Flange :
Socket welding flange, a popular type of pipe flange, was initially developed for use on small-sized high- pressure piping. The fabrication of this type of flange is similar to that of a slip-on flange. However, the internal pocket of a socket weld flange allows for a smooth bore and better fluid flow. When provided with an internal weld, the static strength of this flange is equal to slip-on flange, but the fatigue strength is 50% greater than double welding slip-on flanges. Smooth bore conditions in such a flange can easily be attained without having to bevel the flange face and, after welding, to reface the socket weld flange as would be required with slip-on flanges. For this reason, the internally welded flange is popular in chemical process piping.
ASME B16.5 RF Socket Weld Flange
Socket weld flanges are similar to slip-on flanges, however, socket welds have an internal recess on the inside diameter to allow for a smoother flow of the process fluid. The positive of this is that is creates a smooth bore with the proper welding and grinding. The negative of this type of flange is that it can be more expensive than a slip-on due to more intricate machining, and they can be less readily available than slip-ons due to the fact that the bottom half of the inside diameter must be made to the same schedule as the pipe that is being used. (you must specify the schedule needed) These socket weld flanges were initially developed for use on smaller sizes of pipe at higher pressure ratings. They are more used on lower pressure temperature as well today.