- Standard Dimensions Ratio ("SDR")
Standard Dimension Ratio (SDR) is a measurement used in the pipe industry to describe the ratio of the outside diameter of a pipe to its wall thickness. The formula for calculating SDR is:
![Standard Dimension Ratio Pipe Wall Thickness Equation Formula]()
This ratio is crucial for determining the pressure rating and structural integrity of the pipe. Pipes with a lower SDR have thicker walls relative to their diameter, making them capable of withstanding higher pressures. Conversely, pipes with a higher SDR have thinner walls and are generally used in lower pressure applications.
SDR is commonly used for plastic pipes, such as those made from polyethylene (PE) and polyvinyl chloride (PVC), in various industries including water supply, gas distribution, and sewage systems.
