Slip On flange or SO flange are commonly lower in price than weld-neck flange, and to this effect are a popular choice for our customers. However, customers should bear in mind that this initial cost saving may be diminished by the additional cost of the two fillet welds required for proper installation. Moreover, weld-neck flanges have a higher life expectancy than slip-on flanges under duress.
Slip-on flange usually have a neck and have a straight bore that the pipe will pass completely through. The installer will slip the flange onto the pipe end and position the flange so that a fillet weld on the neck to the pipe, and a fillet weld inside the bore of the flange between the end of the pipe and the bore of the flange, will secure and seal the connection.The connection with the pipe is done with 2 fillet welds, as well at the outside as also at the inside of the flange.
A disadvantage of the flange is, that principle always firstly a pipe must be welded and then just a fitting. A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange.
| Flange Type | Slip-On; Welding Neck, Socket Welding, Blind, Thread, Lap-joint; Long Welding Neck; Orifice; All flanges in Raised Face, Flat face and RTJ; |
| Material | ASTM A105; A350 LF2; A694 F42, F46, F52, F56, A182 F12/F22/F5/F9/ F91; A182 F304/F304L/F316/F316L, etc. |
| Size | 1/2”~60”, as the clients’ requests; |
| Pressure | Class: 150 300 400 600 900 1500 2500; PN6,PN10,PN16,PN25,PN40;5K,10K,16K,20K,30K |
| Standard | ASME B16.5, ASME B16.47, MSS SP43, EN1092，DIN, JIS; |
