Metal pipe bending

Metal pipe bending :In laying metal conduit should be to minimize the elbow , elbow each metal tube should not more than three , not more than two right angle bend , S bend should not occur , for larger cable cross-section allowed to have elbow , can be larger diameter pipe or additional cable box . Bending radius shall meet the following requirements: Ming Hydraulic tube fittings, generally not less than 6 times the tube diameter ; just a bend , from time to less than 4 times the diameter pipe ; whole row of steel pipe in the corner , should be bent into the shape of concentric circles . Ming piping, generally not less than six times the tube diameter , laid in the ground or inside the concrete floor , it should be not less than 10 times the tube diameter . Conduit bends should not wrinkle , depression and cracks , and the degree of bend flat tube diameter should not exceed 10% .