As we all know, Φ and DN are generally used to represent the pipe diameter, so can Φ and DN be common？This article has sorted out the definition of Φ and DN and the difference between them:

The difference between Φ and DNFirst, different definitions

1. What is DN？

DN is a common specification unit in China and European systems, and it is also a specification for identifying pipes, valves, flanges, pipe fittings and pumps, such as DN250。

DN refers to the nominal diameter of the pipe, which is the average of the outside diameter and the inside diameter。 DN value =De value -0.5* pipe wall thickness。

Note: This is neither the outside diameter nor the inside diameter。

2. What is Φ？

Φ is a universal unit, refers to the pipe and or elbow, round steel and other materials diameter size, can also be said to be diameter, such as Φ609.6mm refers to the outside diameter of 609.6mm。

Φ represents the diameter of an ordinary circle;It can also represent the outside diameter of the pipe, but in this case it should be multiplied by the wall thickness。For example, Φ25×3 indicates a pipe with an outer diameter of 25mm and a wall thickness of 3mm。Seamless steel pipe or non-ferrous metal pipe should be marked "outer diameter × wall thickness"。

The difference between Φ and DN two, the scope of indication is different

1. Indication range of DN

Polyvinyl chloride (PVC) pipe, cast iron pipe, steel-plastic composite pipe, galvanized steel pipe nominal diameter

2. The indication range of Phi

Seamless steel pipe or non-ferrous metal pipe should be marked with "outer diameter × wall thickness", such as: Phi 108X4。For example Phi 108×4, Phi can be omitted。Some steel pipe standards in China, ISO and Japan use wall thickness dimensions to indicate the wall thickness series of steel pipes。The specification of such steel pipe is expressed as the outer diameter of the pipe × wall thickness。例如 ф60.5×3.8。

Above isAtlas Bolet compressorSmall collection of the difference between the pipe Φ and DN, I hope to help you limited!