Most scientific calculators (and even the calculators built into smart phones) have these functions. The relatively simple math formulas of sine, cosine, and tangent can be used to determine the angles of the triangle, and, therefore, the necessary angles of your pipe bend(s). No matter how the tube is bent in this configuration (or how the triangle is oriented), one of the angles of the triangle will be 90° the other angle will depend on the first angle (d), and can be calculated as (90 – d).
The “d” represents the angle at which the pipe is bent.
The lengths/sides of the triangle are labeled “a,” “b,” and “c”. The black line represents an offset bend in a tube the red triangle represents the triangular geometry this offset creates. Most bends other than 90° can be calculated using the geometry of a triangle. Then, use this formula:įor example, if your die creates a 2.2” radius, and you need to create a 35° bend, your calculations would look something like this:
Using the same variables as above, the standard dimension ratio (SDR) of a pipe can be calculated thusly:Ĭalculating CLR (Center Line Radius) for Bend AngleĪfter you’ve selected the appropriate die for bending your pipe, based on the pipe’s outside diameter and wall thickness, you should be able to find the radius of the bend.Ī simple way to determine the center line radius of a bend of a specific angle is calculate a full circle, then divide that number by 360 to find the measurement of one degree.
S = wall thickness (mm) | S = pipe serial (-) Σ s = hoop stress (N/mm 2) | PN = normal pressure (bar) | da = external pipe diameter (mm) (pi) 3.1416 For example, if your die creates a 2.2 radius, and you need to create a 35° bend, your calculations would look something like this: to calculate one degree of bend 3.1416 (2x2.2) 13.823/360 0.0384 to calculate CLR of 35° bend 0.0384 x 35 1.
ISO 161-1 uses the following formula to calculate the wall thickness of pipe: It is important to understand the different elements of a bend in order to make accurate calculations. This radius will vary depending on the outside diameter of the tube, the wall thickness, and the angle at which the tube is to be bent. When calculating bend allowances to determine the cut length of HDPE conduit or PVC pipe, one must calculate from the center line radius (CLR) of the finished, bent pipe. An inexpensive scientific calculator and an angle finder are the only additional tools required. This calculator will generate optimal mandrel. Using just a few mathematical formulas allows you to properly calculate a bend of nearly any angle. Directions: Input tube and bend specifications into the boxes shown below. Formulas for Calculating Conduit & Pipe Bendsįormulas for Calculating Conduit & Pipe Bends.The authors compare the results obtained with data from the literature, discuss the advantages and disadvantages of the methods, and present recommendations for their practical application.
To verify the analytical solution and its applicability limits, two numerical procedures were developed, which are based on the finite difference method and the reduction to the Kochi problem by the expansion of the unknowns in the Fourier series over the circumferential coordinate. For the flexibility factor, analytical solutions are presented in the case where a bend is approximated by a rigid restraint on both ends. Boundary conditions are formulated in terms of the tangential and longitudinal displacements and axial and shearing stress resultant. An approximate analytical solution, which has a trapezoidal structure and is written in terms of Krylov’s functions, has been obtained. The method is based on the use of simplifying hypotheses and is reduced to the solution of a system of fourth-order differential equations along the axial coordinate with respect to unknown coefficients in the expansion for tangential displacements. Nominal Pipe Size (A) (SEE MATERIAL CHART). The authors proposed an analytical method for the analysis of the end effect in a pipe bend loaded by a bending moment with consideration for the action of internal pressure. Calculators Bend Weight & Length calculator allows you to determine the approximate weight of your bend.