What does PE pipe sdr mean?

In the selection and application of PE pipes, we often encounter the term "SDR". For non-professionals, SDR may seem a little unfamiliar. So, what exactly does the SDR of PE pipes mean? What is its significance? This article will explain it in detail for you and explain it in combination with the PE pipe products of AD pipes.

SDR, the full name is Standard Dimension Ratio, which is translated into Chinese as "standard size ratio". It is an important technical parameter of PE pipes. It specifically refers to the ratio of the nominal outer diameter (dn) to the nominal wall thickness (en) of the pipe. It is expressed by the formula: SDR = dn/en.

From this definition, we can see that SDR actually reflects a proportional relationship between the outer diameter and wall thickness of PE pipes. So, what is the practical significance of this ratio? Generally speaking, the larger the SDR value, the thinner the nominal wall thickness of the pipeline under the same nominal outer diameter. The thinning of the wall thickness directly affects the pressure-bearing capacity of the pipeline. Therefore, the larger the SDR value of the PE pipe, the lower the internal pressure it can withstand; conversely, the smaller the SDR value, the thicker the wall thickness of the pipeline, the stronger its pressure-bearing capacity.

In practical applications, professional manufacturers like AD Pipe will produce a series of PE pipe products that cover a variety of different SDR specifications, such as the common SDR11, SDR17.6, SDR21, SDR26, etc. These different SDR grades correspond to different pressure grades. Engineering designers will choose PE pipes with suitable SDR specifications according to various factors such as the specific conveying medium, working pressure, laying environment and project cost.

For example, if it is a main pipe for conveying tap water with high pressure, PE pipes with smaller SDR value, thicker wall thickness and stronger pressure bearing capacity are usually selected; for some drainage, sewage or farmland irrigation scenarios that do not require high pressure, PE pipes with larger SDR value and relatively more economical can be selected. During the production process of AD pipes, relevant standards will be strictly followed to ensure that the SDR value of each PE pipe product meets the design requirements, so as to ensure the safe and reliable operation of the product under various working conditions.

Understanding the meaning of SDR of PE pipe will help us choose and use PE pipe more scientifically and reasonably to ensure engineering quality and use effect. If you have doubts about the choice of SDR when selecting PE pipe, it is recommended to consult professional technicians or regular production companies like AD Pipe to get the most suitable solution for your project needs.