Schedule Terminology

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For all pipe sizes the outside diameter (O.D.) remains relatively constant. The variations in wall thickness affects only the inside diameter (I.D.).

A schedule number indicates the approximate value of

Sch. = 1000 P/S

where

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 Pipe

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 Pipe

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)

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Related Topics

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

Related Documents

• ASTM A106, API 5L and ASTM A53 Seamless Carbon Steel Pipes - Pressure and Temperature Ratings - Pressure (kPa) and temperature (^oC) ratings of ASTM A106, API 5L and ASTM A53 Seamless Carbon Steel Pipes - temperatures ranging -29 ^oC - 450 ^oC
• ASTM A53 B Carbon Steel Pipes - Working Pressure - Maximum working pressure of carbon steel pipe at temperature 400^oF
• Calculating Pipes Weight - A weight calculating formula for steel pipes
• Carbon, Alloy and Stainless Steel Pipes - ASME/ANSI B36.10/19 - Pipe sizes, inside and outside diameters, wall thickness, schedules, moment of inertia, transverse area, weight of pipe filled with water - U.S. Customary Units
• Nominal Wall Thickness Pipe - Nominal wall thickness seamless and welded carbon and alloy steel pipes
• Steel Pipes Dimensions - ANSI Schedule 80 - Internal and external diameters, areas, weights, volumes and number of threads for schedule 80 steel pipes