Slip On Flanges

Slip On Flanges


Slip on flanges is also called SO flanges, slip-one flanges or flat welding flange. Compared with weld neck flanges, it has easier structure, and consume less materials, but its hardness and tightness is not good. It is widely used in low and middle pressure pipeline connection.


Slip On Flanges Specification Table

Alternative name SO flange, Flat welding flange
Production Method Forged SO flange, Centrifugal Casting SO flange, Slicing SO flange 1.Casting SO flange advantage is in low cost and making complex form, but get casting defects 2. Forged SO flange advantage inner structure even, with no blowhole and harmful material, but in low production efficiency and slight higher cost 3.Slicing SO flange size is under the width of jobbing sheet. 4.Rolling up SO flange is mainly used for production of big size flange
Standard ASME B16.5, ANSI B16.5, ANSI B16.47, API 605, DIN 2576
Pressure ANSI Class 150-2500Lb
Size DN10-2000mm
Materials Carbon steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42,F46,F48,F50,F52,F56,F60,F65,F70
  Stainless steel: 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8, ASTM A182 F304、304L, F316, 316L,
  Alloy steel:Cr5Mo, 12Cr1MoV, 15CrMo, ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11,16MnR, 12Cr2Mo1, A335P22, St45.8/Ⅲ;
Flange face RF (Raised Face), FF (flat face)
Surface Treatment Anti-rust oil, yellow or black painting, hot dipped galvanized
Packing In wood crate, Seaworthy Carton Packing
Usage Low and middle pressure pipeline connection
Advantage 1. Easy to centering install 2. Cost is low 3. Both inside and outside of the flange is welded to increase strength and keep out of leakage 4. Has low hub, because the pipe slip into the flange before weld.
In different standards, the dimensions of the Slip On flange and sealing face have a different technical data, it is necessary to confirm all the details to make sure the flange can match the joint with the pipe or another flange. Attention: Slip on flange can not be welded directly to elbow, tee and other pipe fittings, but need to add pipe between them.

The measurement of slip on flanges

OD: Outside Diameter of flange
ID: Inside Diameter of flange
BC: Bolt Circle
HD: Hole Diameter

Slip On Flanges Picture