8D Seamless Pipe Bend

8D Seamless Pipe Bend

What is an 8D seamless pipe bend?

An 8D bend is a pipe bend that has a bending radius that is 8 times the outer diameter of the bend. The bends can come in different bending radii and different makes such as welded and seamless bends. The 8D Seamless Pipe Bend is made as a seamless bend with a bending radius of 8 times the outer diameter of the bend. For applications that have thick liquids flowing inside the pipeline, shorter and sudden turns will obstruct the fluid flow. To avoid this, larger radius bends such as the 8D Bend are used. This allows a smooth flow, yet makes the directional change.

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What is the hot forming method of 8D pipe bend?

8D Pipe Bend can be made by different methods of production. One such method is hot forming. The hot forming is applied on larger diameter pipes because they cannot be bent with equal thickness through cold forming methods. The hot forming involves heating up the Fabricated 8D Bending through an induction coil. The pipe piece is placed on the hydrostatic draw and in between two levers to maintain the correct length. An arm pushes the pipe forward while the pipe has reached a sufficient temperature is reached. This allows for equal thickness over the bent surface of the pipe.

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How to calculate a large diameter 8D pipe bend radius?

Depending on the outside diameter of the pipe, the 8D radius changes. The calculation is to simply multiply the outside diameter by 8 times and that will yield the 8D Pipe Bend radius. However, there are formulas to apply according to standards. The calculation charts provide the different sizes according to the ASME standards. The Large Diameter 8D Pipe Bend radius also depends on the thickness of the pipe. If the thickness is also larger then the bending radius differs as well.

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Minimum thickness requirement of hot induction 8D bends

The minimum thickness of the bend is defined as per ASME B31.5 §504.2.1 specifications. For regular pipes, the minimum thickness for Long Radius 8D Bend and short radius ones for hot forming is 30mm. It changes according to the material composition and the standards. The minimum thickness standard is to make sure that the pipe is not destroyed or deformed during the hot forming process.

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Which test is a non-destructive test of carbon steel 8D pipe bend?

ASME B16.9 8D SMLS Bend has to be tested for quality. There are destructive and non-destructive methods. The non-destructive methods do not damage the product after testing. Ultrasonic sonic and hydrostatic tests are non-destructive tests that can be performed on an 8D Short Radius Bend or long radius bend.

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Commercial benefits of stainless steel 45 deg 8D bend

A 180° bend turns the flow in the opposite direction. The 8D 90 Degree Bends turn the direction perpendicular. So these two bends have more potential for clogging. Slag accumulation and drag are less in a Buttweld 8D Pipeline Bend that is only 45° in bending angle. This allows for smoother drain discharge and the transition of fluids inside the pipes.