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.
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:
Note that many of the schedules are identical in certain sizes.
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.
Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more.
Internal and external diameters, areas, weights, volumes and number of threads for schedule 80 steel pipes.
Pipe sizes, inside and outside diameters, wall thickness, schedules, moment of inertia, transverse area, weight of pipe filled with water - U.S. Customary Units.
Maximum working pressure of carbon steel pipe at temperature 400oF.
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.
Dimensions and weights of steel tubes according BS EN 10255.
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'.
Pressure numbers (PN) vs. flange class designations.
Weight calculating equation for steel pipes.
Nominal wall thickness of seamless and welded carbon and alloy steel pipes
Bundling schedules for standard weight and extra strong steel pipes.
Pressure classes, schedules and weights of pipes for threaded & socket welded fittings.
Nominal weights of welded steel pipes ranging 26 - 60 inches.
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