skypefacebook twitter linkedin flickr youtube

Forged Flange and Forged Fittings Carbon Steel Pipe Fittings Industrial Valve seamless steel pipe Grooved Fitting


    Hot Induction Bends: 3D Elbow and 5D Elbow

    1. What are hot induction pipe bends?

    Distinguished from off-the-shelf 1D(Short Radius / SR) and 1.5D(Long Radius/LR) regular elbows or returns which are made to ASME B16.9 code and other international standards (such as EN, BS, DIN, and JIS, etc), pipe bends refer to custom bends fabricated through electric hot induction bending process with much larger center line radius(CLR). The pipe bends can be fabricated either with or without tangent lengths depending on the client's specific requirements.

    2. What are 3D bends or 5D bends?

    3D Bends and 5D Bends are the most widely utilized hot induction bends. They are also called 3D Elbow or 5D ElbowThe digit number before "D" indicates the CLR(Center Line Radius) value. Take 5D bends for NPS 6" pipes for example, the CLR value can be caculated by: 5 x 6"(NPS) = 30" = 762mm. The tangent length of each end should be specified by the client while placing an order. 

    3. Hot induction manufacture process

    The manufacture process utilizes mid-frequency induction heating to heat a narrow band 360 degrees around pipe at the point of bending as the pipe is being pushed through the inductor coil at a constant velocity. After the material passes through the coil it may be cooled by forced air or water spray, or it may be allowed to cool in still air. Bends in any producible wall thickness and diameter can be produced from seamless pipes, welded pipes, or cylinders, etc.
    Stainless Steel 3D and 5D Bends
    Carbon Steel 3D Elbow and 5D Elbow

    4. Advantages of hot induction pipe bends(custom design)?

    1) Large radius for smooth flow of fluids.
    2) Cost effective due to less field welding and quick installation.
    3) Less X-Ray(RT) inspection on site.
    4) Different angles to fit the job at site.
    5) Fewer welds means less potential for leakage.
    6) Uniformity of material of pipes and bends.
    7) Precise dimension control during production.
    8) Less need for on site coating or shrink sleeves in the field.
    9) Minimal changes in ovality, wall thickness and micro structure due to hot bending vs. cold bending.


    Views: 12027  Author:METALS INDUSTRIAL  Date:2015/02/09