# What does dr11 mean?

## What does dr11 mean?

This means that two pipes with the same OD but different DR numbers would have different wall thicknesses. For example, a 14” OD pipe with a wall thickness of 1.273 inches would have a DR of 11, while a 14” pipe with a wall thickness of 0.824 would have a DR of 17.

## What is SDR 17 pipe used for?

This pipe is an outer-diameter- and wall-thickness-controlled product. SDR 17 provides for an inside diameter that is very close to the inside diameter of PVC and cast iron sewer piping of the same size.

What is SDR17 pipe?

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 the difference between DR14 and DR18 pipe?

DR18 pipe shall have a pressure class of 1,620 kPa (235 psi). DR14 pipe shall have a pressure class of 2,100 kPa (305 psi).

### What is SDR HDPE?

So, what is SDR for HDPE pipe? SDR stands for “standard dimension ratio”, and is used to rate pressure piping. It’s an inverse relationship, though. The higher the SDR, the lower the pressure rating. SDR indicates the amount of pressure (in PSI) a HDPE pipe can withstand.

What should the pressure be on a PE4710 Dr 17 pipe?

The manufacturer’s published pressure class for a PE4710 DR 17 pipe is 125 psi. The allowable total pressure during surge is 187.5 psi ( 1.5 X PC =1.5 X 125 psi). The allowable surge allowance is 62.5 psi ( 187.5 psi – 125 psi).

#### How much pressure is allowed in a HDPE pipe?

The allowable total pressure during surge is 187.5 psi ( 1.5 X PC =1.5 X 125 psi). The allowable surge allowance is 62.5 psi ( 187.5 psi – 125 psi). Stopping a flow that had a velocity of 5 fps will cause a pressure surge of 56 psi in a 12” DR 17 HDPE pipe.

#### What does a higher Dr mean for PVC pipe?

A PVC pipe with a higher DR has a thinner wall. This means that as DR increases, the pipe will have less pressure capacity and lower pipe stiffness. By definition, DR is applicable only to solid-wall pipe and has no relevance for profile-wall products. The bottom line: DR and SDR are identical.

What’s the difference between a high and low SDR pipe?

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. With a low SDR ratio, the pipe wall is thick compared to the pipe diameter. So a high SDR pipe has a low-pressure rating, and low SDR pipe has a high- pressure rating.

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