# What does SDR 26 mean?

**SDR**- The ratio of pipe diameter to wall thickness (

**SDR**= D / s) D = pipe outside diameter (mm, in) s = pipe wall thickness (mm, in)

**SDR 26**(Diameter - D - is

**26**times the wall thickness - s ) Thus rated pressure is higher for low

**SDR**ratios and lowwer for higher

**SDR**ratios.

Also know, what is the difference between SDR 26 and SDR 35?

term **SDR 35**, from a strength classification requirement for PVC pipe, requires a minimum pipe stiffness of 46 psi at 5% deflection, for **SDR 26** - 115 psi, and for **SDR** 23.5 - 153 psi. The key to requiring a particular **SDR** for plastic pipe is no **different** than for other pipe products such as (rigid) concrete pipe.

Likewise, what is the difference between SDR 11 and SDR 17? For a specific outside diameter pipe, the thicker the wall thickness, the lower the **SDR** value, which means a **SDR 11** pipe has a higher wall thickness than a **SDR 17** pipe of the similar outside diameters. The allowable ring deflection value varies from one **SDR** to another and is generally reported by pipe manufacturers.

Also, what SDR means in pipes?

Standard dimension ratio (**SDR**) is a method of rating a **pipe's** durability against pressure. The standard dimension ratio describes the correlation between the **pipe** dimension and the thickness of the **pipe** wall. Common nominations are SDR11, SDR17 and SDR35. **Pipes** with a lower **SDR** can withstand higher pressures.

What is SDR 11 pipe used for?

Many PE **pipe** manufacturers **use** the **SDR** method of rating pressure **piping**. An **SDR**-**11** means that the outside diameter (OD) of the **pipe** is **eleven** times the thickness of the wall. With a high **SDR** ratio, the **pipe** wall is thin compared to the **pipe** diameter.