Welding-Neck Flanges

WELDING NECK FLANGES are distinguished from other types by their long tapered hub and gentle transition of thickness in the region of the butt weld joining them to the pipe. The long tapered hub provides an important reinforcement of the flange proper from the standpoint of strength and resistance to dishing. The smooth transition from flange thickness to pipe wall thickness effected by the taper is extremely beneficial under conditions of repeated bending, caused by line expansion or other variable forces and produces an endurance strength of welding neck flanged assemblies equivalent to that of a butt welded joint between pipes, which, in practice, is the same as that of unwelded pipe. Thus this type of flange is preferred for every severe service condition, whether this results from high pressure or from sub-zero or elevated temperature, and whether loading conditions are substantially constant or fluctuate between wide limits.

Slip-On Flanges

SLIP-ON FLANGES continue to be preferred to welding neck flanges by many users on account of their initially lower cost, the reduced accuracy required in cutting the pipe to length, and the somewhat greater ease of alignment of the assembly; however their final installed cost is probably not much, if any, less than that of welding neck flanges. Their calculated strength under internal pressure is approximately two-thirds that of welding neck flanges, and their life under fatigue is about one-third that of the latter. For these reasons, slip-on flanges are limited to sizes ½" to 2 ½" in the 1500 lb standard and are not shown in the 2500lb standard.

Orifice Flanges

ORIFICE FLANGES are widely used in conjunction with orifice meters for measuring the rate of flow of liquids and gases. They are basically the same as standard welding neck and slip-on flanges except for the provision of radial, tapped holes in the flange ring for meter connections and additional bolts to act as jack screws to facilitate separating the flanges for inspection or replacement of the orifice plate. In choosing the type of orifice flange, the considerations affecting the choice of welding neck and slip-on standard flanges apply with equal force.


Forged Parts and Tooling – A Victim of Supply Chain “Disintegration”

As a new weapon system is created, all participants in the supply chain are brought together to design and procure components, and to manufacture the final product.

However, as weapon systems go out of production, the information flow between the US Department of Defense (DoD) and the Forge Shop “disintegrates”.


Stainless Steel Flange 

Features:
Dimensions:
1) DN: 10-600
2) OD: 1/2 - 24"
3) 150 - 2,500lbs





   
  Welding-Neck Flanges  
  Slip-On Flanges  
  Blind Flanges  
  Lap-Joint Flanges  
  Threaded Flanges  
  Socket Weld Flanges  
  Orifice Flanges  
Forged Parts and Tooling  
Stainless Steel Flange