Contractors Unlimited

PipeSchedules

What is a Pipe Schedule?
Pipes are designed to carry fluid, therefore their internal diameter is their critical dimension. This critical dimension is referred to as the nominal bore, appreviated as NB. Obviously, for pipes containing pressurised fluids the wall thickness, and by implication the pipe's strength, is important. Wall thickness is expressed in "schedules", refered to as pipe schedules.
 
The wall thickness associated with a particular schedule depends on the pipe size as can be seen from the charts below for some of the more common sized carbon steel pipes encountered.
 
Abbreviations used: NB - nominal bore, STD - Standard, EH - Extra Heavy, DBL EH - Double Extra Heavy.
 
 2"NBOD = 2.375 inch (60.32 mm)
Schedule510203040
STD
6080
EH
100120140160DBL EH
ID (ins)2.2452.157------2.067---1.939---------1.6891.503
ID (mm)57.0254.79------52.5---49.25---------42.9 38.18

 
 3" NBOD = 3.5 inch (88.9 mm)
Schedule51020 3040
STD
6080
EH
100120140160DBL
EH
ID (ins)3.3343.260------3.068---2.900---------2.6242.300
ID (mm)84.6882.8------77.93---73.66---------66.65 58.42

 
 4" NBOD = 4.5 inch (114.3 mm)
Schedule51020 3040
STD
6080
EH
100120140160DBL EH
ID (ins)4.3344.260------4.026---3.826---3.624---3.4383.152
ID (mm)110.08108.2------102.26---97.18---92.05---87.33 80.06

 
 6" NBOD = 6.625 inch (168.275 mm)
Schedule510203040
STD
6080
EH
100120140160DBL EH
ID (ins)6.4076.357----6.065--5.761-- 5.501--5.1894.897
ID (mm)162.74161.47----154.05--146.33--139.73--131.8124.38

 
 8" NBOD = 8.625 inch (219.1 mm)
Schedule510203040
STD
6080
EH
100120140160DBL EH
ID (ins)8.4078.3298.1258.0717.9817.8137.6257.4397.1897.0016.8136.375
ID (mm)213.54211.56206.38205202.72198.45193.67188.95182.6177.83173.05161.93

 
 10" NBOD = 10.750 inch (273 mm)
Schedule510203040
STD
6080
EH
100120140160DBL EH
ID (ins)10.48210.4210.2510.13610.029.7509.5649.3149.0648.7508.500---
ID (mm)266.24264.67260.35257.45254.5247.65242.93236.58230.23222.25215.9---

 
 12" NBOD = 12.750 inch (323.85 mm)
Schedule51020 3040
STD
6080
EH
100120140160DBL EH
ID (ins)12.4212.3912.2512.0911.938
12.000
11.62611.376
11.750
11.06410.7510.5010.126---
ID (mm)315.47314.7311.15307.1303.22
304.8
295.3288.95
298.45
281.03273.05266.7257.2---


Piping Material Guide
 

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