Leidingdiameters

Leidingdiameters refers to the diameter of a conduit, pipe, or duct that transports liquids, gases, or electrical cables. The diameter is a central design parameter because it governs flow capacity, mechanical strength, and compatibility with fittings and components. In practice, several related measures are used to describe a conduit’s size.

For circular cross-sections, the outer diameter (OD) is the external width of a tube or pipe, while the inner diameter (ID) is the width of the hollow bore inside the wall. Nominal diameters (such as DN, NB, or NPS) provide standardized size designations that simplify specification and interoperability, even though the exact actual diameter may differ due to tolerances and wall thickness. In electrical conduit systems, the interior diameter and the intended fill determine how many cables can be installed.

The cross-sectional area A of a circular conduit is A = πD²/4, and the flow capacity depends on this area, the fluid velocity, and the fluid’s properties. For non-circular ducts, a hydraulic diameter Dh = 4A/P (where P is the wetted perimeter) is used to relate geometry to flow behavior. Diameters are commonly expressed in millimeters or inches, and the choice of diameter is guided by standards and practical requirements.

Standards bodies such as ISO, DIN, ANSI, and ASME define nominal sizes, tolerances, wall thicknesses, and compatibility guidelines for pipes, tubes, and conduits. Practical design also considers material strength, corrosion resistance, installation constraints, and regulatory codes. In summary, leidingdiameters connect the physical size of a conduit to its functional performance and fit within a broader system of standards and applications.