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# SDR (Standard Dimension Ratio) and S Pipe Series

### Standard Dimensions Ratio - SDR

Many plastic pipe manufacturers use the "Standard Dimension Ratio" - SDR - method of rating pressure piping. The SDR is the ratio of pipe diameter to wall thickness and the SDR can be expressed as

SDR = D / s                                 (1)

where

D = pipe outside diameter (mm, in)

s = pipe wall thickness (mm, in)

#### Example - SDR

SDR for a 10 inches ASTM D2241 - PVC Pipe with outside diameter 10.750 inches and wall thickness 0.168 inches can be calculated as

SDR = (10.750 in) / (0.168 in)

= 64

A SDR 64 means that the outside diameter - D - of the pipe is 64 times the thickness - s - 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

As a consequence a high SDR pipe has a low-pressure rating and low SDR pipe has a high-pressure rating.

### Pipe Series - S

Pipe series - S - is a dimensionless number related to the nominal outside diameter and wall thickness of a pipe. The pipe series - S - can be calculated as

S = (SDR - 1) / 2                        (2)

where

S = pipe series

## Related Topics

### • Dimensions

Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more.

### • Fluid Flow and Pressure Loss

Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more.

### • Pressure Ratings

Pressure ratings of pipes and tubes and their fittings - carbon steel , stainless steel, plastic, copper and more.

## Related Documents

### ASTM D2241 - Poly(Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series) - Dimensions

Dimensions of PVC pipe SDR series.

### ASTM D2513 - Thermoplastic Gas Pipes - Dimensions

Dimensions of thermoplastic pressure pipes.

### ASTM D3035 - Polyethylene PE pipes - dimensions

Dimensions of PE pipes based on controlled outside diameter.

### Bending PE Pipes

Bending PE pipe calculator.

### EN 12201 - Polyethylene (PE) Pipes for Water Supply, and for Drainage and Sewerage under Pressure - Dimensions

Dimensions of PE pipes according EN 12201.

### EN 1452 - Unplasticized Poly Vinyl Chloride (PVC-U) - Dimensions

Dimensions of PVC-U pipe according EN 1452.

### ISO 11922 - Thermoplastics Pipes for the Conveyance of Fluids - Dimensions

Dimensions of plastic pipes according ISO 11922 - metric and imperial units.

### ISO 161 - Thermoplastics Pipes - Dimensions

Dimensions of thermoplastic pipes according ISO 161.

### ISO 4427 - PE Pipes for Water Supply - Dimensions

Polyethylene pipe dimensions according European Standards.

### ISO 4437 - PE Pipes for Gaseous Fuels Supply - Dimensions

Dimmensions of PE pipes for gaseous supply according ISO 4437.

### PE (PolyEthylene) Pipes - PN Pressure Grades

Polyethylene - PE - pipes and pressure classes.

### PE (PolyEthylene) Pipes - Pressure Loss vs. Water Flow

Water flow in SDR pressure rated PE-pipes - pressure loss and velocities - Imperial and SI units.

### PE (PolyEthylene) Pipes - Pressure Ratings vs. Size

Water pressure ratings for schedule 40 and schedule 80 Polyethylene plastic pipes

### PE (PolyEthylene) Pipes - Pressure vs. Temperature Ratings

Polyethylene pipe temperature and maximum operating pressure.

### PE - Polyethylene High Density Pipes - Weights

Weight of polyethylene pipes - metric units.

### PE Polyethylene - Chemical Resistance

Chemical resistance of Polyethylene - PEH - to common products.

### PE, PEH and PVC Pipes - Pressure Loss vs. Water Flow Diagram

Pressure loss (bar/100 m) and velocy in PE, PEH or PVC pipes with water flow.

### Pipes - Nominal Wall Thickness

Nominal wall thickness of seamless and welded carbon and alloy steel pipes

### Pipes and Tubes - Imperial vs. Metric Sizes

SI vs. Imperial pipe sizes.

### Plastic Pipes - Friction Head Loss vs. Water Flow

Friction head loss (ft/100 ft) vs. water flow in plastic pipes like PVC, PP, PE or PEH.

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