![]() For example, Φ25×3, which means a pipe with an outer diameter of 25mm and a wall thickness of 3mm. The outer diameter of PPR, PE pipe, and polypropylene pipe is generally marked with De, and all need to be marked in the form of outer diameter * wall thickness, for example, De25×3.ģ, D generally refers to the inner diameter of the pipe.Ĥ, Φ represents the diameter of an ordinary circle it can also represent the outer diameter of the pipe, but in this case, it should be multiplied by the wall thickness. Water and gas transportation steel pipes (galvanized steel pipes or non-galvanized steel pipes), cast iron pipes, steel-plastic composite pipes, and polyvinyl chloride (PVC) pipes shall be marked with a nominal diameter “DN” (such as DN15, DN50).Ģ, De mainly refers to the outer diameter of the pipe. Note: This is neither the outer diameter nor the inner diameter. The value of DN=the value of De-0.5*tube wall thickness. DN refers to the nominal diameter of the pipe, which is the average of the outer diameter and the inner diameter. ![]() The diameter of PVC pipe and fitting can be divided into outer diameter (De), inner diameter (D), and nominal diameter (DN).ġ. Pvc pipe and fitting size chart includes the national standards, sizes, Imperial and Metric, symbols, etc The meaning of De, DN, D, Φ
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