Bending a pipe stretches the outside of the bend and compresses the inside, and both of those have consequences that matter more on heavy engineering work than most bend specifications acknowledge. The outside wall thins as it stretches, which reduces the pressure rating exactly where the material is being asked to do the most work. The inside compresses and, if it isn’t supported, wrinkles. Meanwhile the round section flattens into an oval, changing the flow area and the pressure capability together. How much of each happens depends on the ratio of bend radius to pipe diameter and on the wall thickness relative to the diameter. A generous radius on a heavy-wall pipe bends predictably with modest thinning. A tight radius on a thin wall is where the trouble concentrates, and it’s the case that needs mandrel support, or induction bending with controlled heating, or an honest conversation about whether the radius on the drawing is achievable in that schedule at all. A Custom Pipe Bending Company in India working on heavy engineering should be running those numbers at enquiry stage. Sharma Technocast handles custom pipe bending with induction, mandrel, and rotary draw capability, plus heat treatment and NDE in-house. For pipe bending requirements, contact Sharma Technocast directly. contact@sharmatechnocast.com +91 9726666123