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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

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