About

Piping engineers and logistics managers rarely think in raw diameters; they think in "Schedule" and "Nominal Pipe Size" (NPS). A 4-inch Schedule 40 pipe does not have a 4-inch outer diameter (it is actually 4.500 inches). Manually looking up these dimensions in ASME B36.10 tables for every weight calculation is tedious and prone to look-up errors.

This tool integrates the complete standard pipe schedule database. By simply selecting the NPS and Schedule, the system retrieves the correct Outer Diameter (OD) and Wall Thickness (t), calculates the steel volume, and applies the standard density of carbon steel (7850 kg/m³) to provide weight per meter and total run weight. Essential for crane lifting plans and shipping manifests.

Formulas

The calculation is based on the volume of the hollow cylinder (annulus) derived from standard ASTM dimensions.

1. Annulus Area (A):

OD : Outer Diameter

ID = OD − 2t

A = π × (OD² − ID²4)

2. Linear Weight:

W_m = A × ρ_steel

Standard Carbon Steel Density (ρ) is taken as 7850 kg/m³.

Reference Data

NPS (inch)	OD (mm)	Sch 40 Wall (mm)	Sch 80 Wall (mm)	Weight Sch 40 (kg/m)
1/2	21.3	2.77	3.73	1.27
1	33.4	3.38	4.55	2.50
2	60.3	3.91	5.54	5.44
4	114.3	6.02	8.56	16.07
8	219.1	8.18	12.70	42.55
12	323.8	10.31	17.48	79.70

Frequently Asked Questions

The dimensions (OD/Thickness) for Stainless Steel (ASME B36.19) often match Carbon Steel (ASME B36.10) for Schedules 10S, 40S, and 80S. However, Stainless Steel density is slightly higher (~7900 kg/m³ vs 7850 kg/m³), so results will be conservative (underestimated by ~0.6%).

For most sizes, STD matches Schedule 40, and XS matches Schedule 80. The tool uses the specific numbered schedules (10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXS) for precision.

The database uses the exact millimeter values from the ASME B36.10M standard.