A slip on flange and a weld neck flange are two of the most common types of flanges used in piping systems. While they may seem similar, they actually have many differences that make them better suited for different tasks.
1. Connecting Method:
The primary difference between a slip on flange and a weld neck flange is how they are connected to the pipe. A slip on flange is connected to the pipe by sliding the flange onto the pipe and then welding it in place. A weld neck flange, on the other hand, is connected to the pipe by welding the neck of the flange directly to the pipe.
2. Pressure Rating:
The pressure rating of a slip on flange is typically lower than that of a weld neck flange. This is because the slip on flange does not create as strong of a connection as the weld neck flange. As a result, it is not able to withstand as much pressure as the weld neck flange.
3. Cost:
Slip on flanges are typically less expensive than weld neck flanges. This is because they require less welding and are often easier to install. The cost of a weld neck flange is typically higher due to the time and effort it takes to weld the neck of the flange to the pipe.
4. Leakage:
Slip on flanges are more prone to leakage than weld neck flanges. This is because the slip on flange does not create as strong of a connection as the weld neck flange. As a result, it is more likely that the slip on flange will leak.
5. Installation:
Slip on flanges are typically easier to install than weld neck flanges. This is because the slip on flange simply slides onto the pipe and is then welded in place. A weld neck flange requires more time and effort to install as it must be welded directly to the pipe.
6. Location:
Slip on flanges are typically used in low pressure applications, while weld neck flanges are used in high pressure applications. This is because the weld neck flange creates a stronger connection and is better able to withstand high pressure.
7. Usage:
Slip on flanges are typically used in applications where the flange is not subject to a lot of stress or vibration. This is because the slip on flange does not create as strong of a connection as the weld neck flange. Weld neck flanges, on the other hand, are used in applications where the flange is subject to a lot of stress or vibration. This is because the weld neck flange creates a stronger connection and is better able to withstand the stress and vibration.
In conclusion, slip on and weld neck flanges are two of the most common types of flanges used in piping systems. While they may seem similar, they actually have many differences that make them better suited for different tasks. Slip on flanges are typically less expensive and easier to install, but they are not as strong as weld neck flanges and are more prone to leakage. Weld neck flanges are typically more expensive and more difficult to install, but they are stronger and more suitable for applications involving stress or vibration.
Weld Neck and slip on Flange Common characteristics
Size
Weld neck flange:1/4″-160″
DN8-DN4000
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.
Flange Facing Types
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)
Material
Carbon steel: ASTM A105,ASTM A105N,GB 20,C22.8.
Alloy steel: ASTM/ASME A182 F1-F12-F11-F22- F5-F9- F91
Stainless steel: ASTM/ASME A182 F304-304L-304H-304LN-304N
ASTM/ASME A182 F316-316L-316H-316LN-316N-316Ti
ASTM/ASME A182 F321-321H, F347-347H
Low temperature steel: ASTM/ASME A350 LF2.
High performance steel: ASTM/ASME A694 F42 , F52, F56, F60, F65, F70
