Wall Factor (WF) = the outside diameter OD / thickness of the walls WT. Generally we can say that tubes with a relative WT below 10 are considered to be strong walled (thick walled) and conversely with a relative WT higher than 40 are thin walled. The resulting value then determines whether it is a thin-walled or a thick-walled tube.
This is the relationship of the outside diameter and the thickness of the walls of the tubes. Wall Factor (WF) - the relative thickness of the wall. The following table gives recommended minimum bending radii for pipes at 20☌.Using a variety of parameters, we can judge the difficulty of the bend and suggest the best set of tools for a given application. The allowable radius of curvature depends on the temperature of the pipe and the SDR. For curves of smaller radius, post formed bends or moulded fittings shall be used. During installation, the minimum allowable bending radius, as shown below, should be observed. Where mechanical joints are used, any joint deflection limitations must be observed. Care must be exercised during construction to prevent over stressing of joints and fittings. Large diameter PE pipes (450mm and above) must be joined together, and then drawn evenly to the desired radius. Instead, the pipe should be progressively supported with backfill material as the curve is formed. Pegs or stakes are not permitted to achieve the pipeline curvature as these can result in highly localised stresses. This can lead to kinking in small diameter, and/or thin wall pipes. This flexibility enables PE pipes to accommodate uneven site conditions, and, by reducing the number of bends required, cuts down total job costs.Īll PE pipes installed on a curved alignment must be drawn evenly over the entire curve length, and not over a short section. Vinidex PE pipes are flexible in behaviour and can be readily bent in the field.
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