Table of Content
- Methods And Benifits
- Pipe Bends
- Radius Chart
- Hybrid CNC
While routing materials through complex piping systems, pipe bending minimizes pressure changes.
Due to the fact that bent pipes do not alter the ends, pipe bends can often be incorporated into a processing system using standard welding processes, flanges, or other connections.
Pipe bends come in a wide variety of sizes and materials, so they can be used for routing everything from hot or caustic liquids to maintaining pressure and movement in liquids with high viscosity or suspended solids, such as the silica sand in Oil Sands slurry lines.
Additionally, as most pipe bending methods are quite cost-effective, using bent pipes and tubes with the ideal length and sizing will have a minimal impact on the overall design budget.
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COMMON PIPE BENDING METHODS AND THEIR BENEFITS
Most pipe-bending methods fall into one of two categories:
- Cold bending
- Hot bending
In cold bending, the pipe is bent using sheer physical force, while in hot bending, heat is used to reduce the force needed.
The degree of bending possible and the final shape of the pipe are determined by the method.
COLD BENDING METHODS
Rotary Draw Bending:
Rotary draw bending involves the use of dies and other various components that work together to bend pipes or tubes in a rotary motion. This action draws the pipe or tube forward, creating the desired bend.
In tubes and pipes with thinner walls, a mandrel is placed inside the bend to prevent defects such as rippling, flattening, and collapse from occurring.
A stationary die bends a pipe or tube while a counter die bends the material around it.
To achieve large radius bends or curves, this method passes a piece of pipe or tube through three rollers in a pyramid configuration.
HOT BENDING OR INDUCTION BENDING
Almost all hot pipe bending methods are induction-based, although there are slight differences.
The pipe is precisely heated using an induction heating coil before pressure is applied to bend it.
It requires much less physical force than cold bending methods and produces bends of similar or higher quality without using filler materials, mandrils, or other additives.
Despite minimizing diameter reduction at the bend site, induction bending alters pipe thickness in some ways.
Intrados — or the inner section of the bend — will typically become thicker while extrados — or the outer section of the bend — will become thinner.
Large-diameter piping and tubing, along with long-radius bends, are the most common applications for this method.
However, it also has uses in smaller piping diameters and short radius bends.
PIPE BEND SIZING
In most cases, pipe bends are measured in relation to the nominal pipe size or diameter (D).
A long radius elbow, for example, has an end-to-center dimension 1.5 times the diameter (sometimes referred to as >1.5D).
Short-radius elbows feature an end-to-center dimension equal to the pipe diameter.
By multiplying the diameter of the pipe by the D designation, you can determine the radius of the centerline of bent pipes and tubes.
For example, a 5D pipe with a 10-inch D will have a centerline radius of 50 inches.
For 180-degree Pipe Bends, the center-to-center measurement is used to determine the space required and how the pipe bends will fit into the system.
The center-to-center dimension of 180-degree pipe bends can be calculated by multiplying the diameter by the D designation.
Short-radius 180-degree pipe bends are 2D while long-radius pipe bends are 3D.
A 4-inch pipe with a short radius bend would have a center-to-center dimension of 8 inches, whereas the same 4-inch pipe with a long radius bend would have a center-to-center dimension of 12 inches.
Whether its elbows or 180-degree bends, the tangent ends of induction bent pipe can be matched to existing piping by diameter, flange, valve, or fitting specifications.
Even though fitting and sizing bent pipes might seem complex at first, a basic understanding of the measurements used makes integrating them into a new design straightforward.
POPULAR MATERIALS USED FOR PIPE BENDING
Pipe bending methods will vary based on the metals used.
Due to the reduced force required to obtain common angles, induction bending is compatible with a wide range of ferrous and non-ferrous materials, including
- Steel & steel alloy pipes
- Stainless steel pipes
- Aluminum pipes
- Copper pipes
- Nickel pipes,
Long Radius Pipe Bends & Return Dimensions
|NPS||Outside Diameter||Back to Face||Center to Center|
|All dimensions are in mm|
Pipe Bend Radius Chart
|Standard pipes||Spec||. Bauart 5||2,5D|
Pipe Fittings Dimensions Tolerance
|NPS||ALL FITTINGS||ALL FITTINGS||ALL FITTINGS||180 DEG RETURN BENDS||CAPS||ELBOWS AND TEES||REDUCERS||180 DEG RETURN BENDS||180 DEG RETURN BENDS|
I.D. at End
(1), (3), (4)
|O.D. at Bevel (1), (2)||Wall Thickness (3)||Centre-to-Centre O||Overall Length E||Centre-to-End Dimension A,B,C,M||Overall Length H||Alignment of Ends U||Back-to-Face K|
|½ to 2½||0.03||
|Not less than 87.5% of nominal thickness||0.25||0.12||0.06||0.06||0.03||0.25|
|3 to 3 ½||0.06||0.06||0.25||0.12||0.06||0.06||0.03||0.25|
|5 to 8||0.06||
|10 to 18||0.12||
|20 to 24||0.19||
|26 to 30||0.19||
|32 to 48||0.19||
Short Radius Bends Standard Radius
|Nominal Piping Size (NPS)||Outside Diameter at Bevel D||Center-to-End 90 Deg Elbows A|
Radius Table of Long Radius Bends
|Nominal Piping Size (NPS)||Outside Diameter at Bevel D||Center-to-End|
|90 Deg Elbows A||45 Deg Elbows B|
Hybrid CNC Tube Bending Radius Chart
|1.25”, 31.75mm, 1 ¼-inches||2”, 50.8mm, 2-inches||Stainless steel and Inconel|
|0.25”, 6.35mm, ¼-inch||.5”, 12.7mm, ½-inch||Stainless steel||.5625”, 14.28mm, 9/16-inch|
|1”, 25.4mm, 1-inch||1.5”, 38mm, 1 ½-inches||Stainless steel and Aluminum|
|.375”, 9.52mm, ⅜-inch||.9375”, 23.8mm, 15/16-inch||Stainless steel and Copper|
|1.5”, 38mm, 1 ½-inches||2.25”, 57.15mm, 2 ¼-inches||Stainless steel|
|.5”, 12.7mm, ½-inch||.5”, 12.7mm, ½-inch||Stainless steel||1.5”, 38mm, 1 ½-inches|
|.75”, 19mm, ¾-inch||1.125”, 28.5mm, 1 -⅛” inches||Stainless steel and Aluminum|
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