Can anyone tell me the formular for material length when bending conduit?

i am bending 20mm and 25mm conduit to 90 degree angles

Answer:
Impossible to answer unless we know the material and wall thicknesses of the conduits, sorry
DEVELOPED LENGTH Of A 90 degree BEND OF 1.5D RADIUS = 1/4 X 3.142 X 3 D where D is diameter of pipe.

so, pipe with 20 mm dia , bend length = 47.13mm
'' ,, 25 ,, ,, = 58.92 mm

FOR GRIPPING THE PIPE AT THE ENDS , STRAIGHT PORTION IS REQUIRED ABOUT 2D.

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