HESUPIPE
Overview of SDR
SDR is the abbreviation of Standard Dimension Ratio, which means standard dimension ratio. It is an important geometric dimension term for pipes. It represents the ratio between the nominal outer diameter (de) and the nominal wall thickness (en) of the pipe. This ratio is very important for plastic pipes because it is directly related to the pressure bearing capacity and application range of the pipe.
Specific meaning of SDR
The calculation formula of SDR is SDR = de / en. The larger the ratio, the thinner the pipe wall is relative to the outer diameter, and the smaller the pressure it usually bears; on the contrary, the smaller the SDR value, the thicker the pipe wall is relative to the outer diameter, and the greater the pressure it can withstand. For example, SDR11 means that the ratio of outer diameter to wall thickness is 11, and SDR17 means that the ratio of outer diameter to wall thickness is 17, which means that the wall thickness of the pipe with SDR11 will be thinner than that of the pipe with SDR17.
Application of SDR in Pipeline Engineering
In pipeline engineering, the selection of SDR value directly affects the design and material selection of pipeline system. Different SDR values correspond to different pressure levels, and are therefore suitable for different pressure and environmental conditions. For example, SDR11 is usually used in lower pressure applications, such as water supply systems; while SDR17 may be used in environments that require higher pressures, such as some industrial pipelines.
How to determine the SDR value
To determine the SDR value, you need to know the outer diameter and wall thickness of the pipe. These two parameters are usually given on the product label of the pipe. For example, a PE pipe with an outer diameter of 110mm and a wall thickness of 10mm can be calculated using the above formula SDR = 110 / 10 = 11.