The pressure on the flange joint tends to increase as the pressure containment capacity and/or the diameter of the pipe increases.
A slip-on hub flange has an additional structure called “hub” in order to bear higher pressure. 
The slip-on hub flange is often used for higher pressure and/or larger diameter pipes than the slip-on flange without the hub.
    
  
    
                    
 
                DAERYUK FLANGE
Flange manufacturer, slip on flange, hub flange, welding neck flange, blind flange, socket welding flange and more
                | Name | Slip-on Hub Flanges | 
| Series | Flange Type | 
                        Product Description
                    
                    
                        Products of DAERYUK FLANGE
                    
                    - 
                                    Flange Type
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                                      Lab Joint FlangesFlange Type 
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                                      Slip-on FlangesFlange Type 
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                                      Welding Neck FlangesFlange Type 
- 
                                
                                      Blind FlangesFlange Type 
- 
                                
                                      Socket Welding FlangesFlange Type 
- 
                                
                                      Threaded/Screwed Flanges)Flange Type 
- 
                                
                                      Slip-on Hub FlangesFlange Type 
- 
                                    Surface Type
- 
                                
                                      Male and Female (M&F)Surface Type 
- 
                                
                                      Raised Face (RF)Surface Type 
- 
                                
                                      Ring Type Joint (RTJ)Surface Type 
- 
                                
                                      Flat Face (FF)Surface Type 
- 
                                
                                      Tongue and Groove (T&G)Surface Type 
 
                 
                