Socket Weld flange
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.
The connection with the pipe is done with 1 fillet weld, at the outside of the flange. But before welding, a space must be created between flange or fitting and pipe.
ASME B31.1 1998 127.3 Preparation for Welding (E) Socket Weld Assembly says:
In assembly of the joint before welding, the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 1/16" (1.6 mm) away from contact between the end of the pipe and the shoulder of the socket.
The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal. The image shows you the X measure for the expansion gap.
The disadvantage of this flange is right the gap, that must be made. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion.
Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting.
Materials Carbon Steel: ASTM A105. ASTM A350 LF1. LF2, CL1/CL2, A234, S235JRG2, P245GH P250GH, P280GHM 16MN, 20MN ,20# Stainless Steel: ASTM A182, F304/304L, F316/316L Types Slip On Plate Flange/Plate Flange , Slip On Hub Flange/Bossed Welding Neck Flange/WN flange/ Loose Flange/Lapped Flange /Backing Flange Blind Flange/Blank flange, Lap Joint Flange /LJ Flange Socket Weld Flange/SW Flange Threaded Flange/Screwed Flange Loose Flange/Lapped Flange Backing Flange RTJ /o-Ring Custom Flange/Special Flange Hot/Cold/Electro Gavanized Flange Standards ANSI/ASME/ASA B16.5 FLANGES, ANSI B16.47 A/B FLANGES JIS B 2220 FLANGES, KS B 1503, DIN SERIES, UNI, EN1092-1, BS4504 BS 10 TABLE D/E/F FLANGES, SANS 1123 FLANGES/SABS 1123 GOST12820-80/GOST12821-80, NFE29203/NS/AS/ISO/AWWA FLANGES Pressure &Ratings 150LBS, 300,600,900,1500,2500 ANSI, ASA B16.5 PN6 PN10 PN16 PN25 PN40 PN64-DIN/UNI PN6 PN10 PN16 PN25 PN40 PN63-EN1092-1/BS4504 PN0.6Pa, PN1.0Pa, PN1.6. PN2.5,PN4.0-GOST12820-80 PN0.6Pa, PN1.0Pa, PN1.6. PN2.5,PN4.0, PN6.3. -GOST12821-80 600kPa, 1000.1600.2500.4000.-SANS 1123 5KG, 10KG, 16KG, 20KG, 30KG, 40KG-JIS B2220/KS B1503 TABLE D, TABLE E ,TABLE F-BS 10, AS2129 CLASS D, CLASS E, CALSS F, AWWA C207 Surface Treatment Rust Prevention , Black Paint Coating or Phosphating Treatment with Black Color Varnish Paint Coating, Varnish Oil Coating, Electro Galvanizing Coating (Cold Galvanizing, Color Golden or silvery white, Coating thickness 20~30(um) Hot Dip Galvanizing Coating (Coating Thickness 200um around) Technical Forging Application Water works, Shipbuilding industry, Petrochemical & Gas industry, Power industry, Valve industry and general pipes connecting projects etc. Inspection Quality Control System-Well Equipments and Machinery-Well Workers and Engineers Packing Wooden Pallets or Wooden Cases or As Customers' Requirements Payment Terms L/C Or 30 % Advance By T/T and The balance Will be Paid After the copy of B/L Delivery Time 30 Days \after the Advance or the L/C After-Sales Service Orders and Products Tracking System
