5D Bend is bend radius 5 times of the pipe outside diameter, for example in a 6'' pipelines 5D bend means the radius at 30''.
As we know steel pipe bend plays the same function with elbow, used to change pipeline direction. Differently elbow radius normally at 1.5D Long Radius Elbow, and 1D Short Radius Elbow, when radius increase it will provide more smooth flow rate and could compatible with higher flow pressure.
As a matter of fact, small radius like elbow used in small and short pipelines, and 3D, 5D, 6D, 8D, 10D, 12D bend used in long pipelines, on safety purpose and install the pipeline net.
But same with elbow, other radius bend like 3D and 5D bend also ranges different degrees like 45 degree, 60 Degree and 90 Degree.
How to different 5D pipe bend from other radius bends like 3D, 8D, 10D
Bending radius is defined by the intersection of two lines from the bend end, (Ending with straight pipe part, the shape is like one quater of a circle). Between two ends is the centralized radius, shorten as CRL. So CRL value is the bend radius value to differ 1.5D, 3D, 5D, 8D, 10D, which CRL is calculated as a multiple of pipe diameter.
5D Bend Dimensions and Bend Length
5D bend length is related to radius and the degrees, similar like elbow, 90° bend/elbow length is double length than 45° bend/elbow length, and is half of 180° bend length. Based on the same radius bend.
Manufacturing process for 5D pipe bend
3D, 5D, 8D bend all manufactured by bending machine with heating the pipes to a certain temperature and transform the pipe by a mechanical force. Making different radius bend is to adjust the circle center of the bending machine.
As below pictures: Insert the straight pipe into pipe bending machine, heat the pipe and use lever (installed with different dimension of mould) to bend the pipe.
Steel pipe bend could be manufactured by hot form and cold form, hot forming is usually for big diameter bend above 3 inch, and cold forming usually refers to the small pipe bend diameter below than 2 inch.
5D Pipe Bend Supply Range:
We supply 5D pipe bend as below standards and material grades:
Manufacturing standard: AISI B16.9
Carbon steel pipe bend: API 5L Grade B, X42, X46, X52, X56, X60, X65, X70, X80 PSL1 & PSL2 & SOUR; ASTM A860 WHPY 42, 46, 52, 56, 60, 65, 70, 80; ASTM A234 WPB, WPC.
Low temperature steel pipe bend: ASTM A333 Grade 6, ASTM A420 WPL6
Alloy steel pipe bend: ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91; ASTM A355 P1, P5, P9, P11, P22, P91
Stainless steel pipe bend: ASTM A403 304/304L, 316/316L.
Outer Diameters: 1/2'' to 60''. DN15 to DN1500
Radius range: R=2D, 2.5D, 3D bend, 5D bend, 6D, 8D, 10D, 12D bend
Degree range: 45 degree, 60 degree, 90 degree and customized degree
Wall thickness: SCH 10, SCH 40, SCH STD, SCH80, SCH XS, SCH160, SCH XXS
Coatings: Black paint, galvanized, epoxy coated, 3PE, FBE, glass fiber