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  1. BW 90 degree elbow is formed by hot forming and connects steel pipes or other pipe fittings through butt welding process. Its function is to change the direction of the fluid by 90 degrees, so it is also called vertical elbow.
    www.zzpipefittings.com/90-deg-elbow-butt-weld-b…
    Butt weld long radius 90 degree elbow is used for 90 degree turn on piping in butt weld piping system. The long radius elbows have a center to end distance that is 1.5 times the NPS in inches (R=1.5D). Long radius elbows are preferred when space is available and flow is more critical.
    steelfittings-flange.com/long-radius-90-degree-elbo…
     
  2. Butt-Weld Pipe Elbows | McMaster-Carr

     
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      Weld Elbow, 90 Long Radius, Butt Weld, SCH40 Carbon Steel

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      Weld Elbows Steel On eBay | Get Weld Elbows Steel On eBay