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# Schedule - Terminology

## Introduction to the schedule terminology of pipes.

For pipes of all dimensions the outside diameter (O.D.) remains relatively constant. The variation in wall thickness affects only the inside diameters (I.D.).

A schedule number indicates the approximate value of

Sch = 1000 P / S                                    (1)

where

Sch = schedule

P = service pressure (psi)

S = allowable stress (psi)

The higher the schedule number is, the thicker the pipe is. Since the outside diameter of each pipe size is standardized, a particular nominal pipe size will have different inside pipe diameter depending on the schedule specified.

### Welded and Seamless Wrought Steel Pipes

To distinguish different weights of pipe it is common to use the Schedule terminology from ANSI/ASME B36.10 Welded and Seamless Wrought Steel Pipe:

• Light Wall
• Schedule 10 (Sch/10, S/10)
• Schedule 20 (Sch/20, S/20)
• Schedule 30 (Sch/30, S/30)
• Schedule 40 (Sch/40, S/40)
• Standard Weight (ST, Std, STD)
• Schedule 60 (Sch/60, S/60)
• Extra Strong (Extra Heavy, EH, XH, XS)
• Schedule 80 (Sch/80, S/80)
• Schedule 100 (Sch/100, S/100)
• Schedule 120 (Sch/120, S/120)
• Schedule 140 (Sch/140, S/140)
• Schedule 160 (Sch/160, S/160)
• Double Extra Strong (Double extra heavy, XXH, XXS)

Note that many of the schedules are identical in certain sizes.

### Stainless Steel Pipes

For stainless steel pipes thru 12-inch schedule numbers from Schedule 5S to schedule 80S are used as published in ANSI/ASME 36.19M Stainless Steel Pipe.

• Schedule 5S (Sch/5S, S/5S)
• Schedule 10S (Sch/10S, S/10S)
• Schedule 40S (Sch/40S, S/40S)
• Schedule 80S (Sch/80S, S/80S)

## Related Topics

• ### Dimensions of Pipes and Tubes

Pipe, tube and fittings sizes and dimensions. Inside and outside diameters, weights and more.

## Related Documents

• ### ANSI Schedule 80 Steel Pipes - Dimensions

Internal and external diameters, areas, weights, volumes and number of threads for schedule 80 steel pipes.
• ### ASME/ANSI B36.10/19 - Carbon, Alloy and Stainless Steel Pipes - Dimensions

Pipe sizes, inside and outside diameters, wall thickness, schedules, moment of inertia, transverse area, weight of pipe filled with water - U.S. Customary Units.
• ### ASTM A53 B Carbon Steel Pipes - Allowable Pressure vs. Schedule and Size

Maximum working pressure of carbon steel pipe at temperature 400oF.
• ### Carbon Steel Pipes - Pressure and Temperature Ratings, Metric Units

Pressure (kPa)> and temperature (degC) ratings of ASTM A-106, API 5L and ASTM A-53 Seamless Carbon Steel Pipes - temperatures ranging -29 degC - 450 degC.
• ### EN 10255 - Non-alloy Steel Tubes for Welding and Threading - Dimensions

Dimensions and weights of steel tubes according BS EN 10255.
• ### NPS - 'Nominal Pipe Size' and DN - 'Diametre Nominal'

The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - 'Diametre Nominal'.
• ### Pipe Class Ratings vs. Pressure Numbers (PN)

Pressure numbers (PN) vs. flange class designations.
• ### Pipe Weight Calculator

Weight calculating equation for steel pipes.
• ### Pipes - Nominal Wall Thickness

Nominal wall thickness of seamless and welded carbon and alloy steel pipes
• ### Steel Pipes - Bundling Schedules Length and Weight

Bundling schedules for standard weight and extra strong steel pipes.
• ### Threaded & Socket Welded Steel Fittings - Pressure Classes vs. Schedules

Pressure classes, schedules and weights of pipes for threaded & socket welded fittings.
• ### Welded Steel Pipes - Weights

Nominal weights of welded steel pipes ranging 26 - 60 inches.

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## Citation

• The Engineering ToolBox (2003). Schedule - Terminology. [online] Available at: https://www.engineeringtoolbox.com/pipe-schedules-d_557.html [Accessed Day Month Year].

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6.3.17

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