Pipe Weight Calculator
Calculate the weight of steel pipes per unit length or total length based on outer diameter, wall thickness and material density.
Introduction
Calculate pipe weight for steel, stainless steel, and alloy pipes. Uses the standard hollow cylinder formula: W = π × (OD − WT) × WT × ρ × L.
How This Calculator Works
Pipe weight = π × (OD − WT) × WT × ρ × L. The engine converts all dimensions to SI base units (meters). Density in kg/m³, length in meters, result in kg.
Step-by-step process:
- Enter your input values in the calculator above
- The engine converts all inputs to SI base units (meters, kg, Pa)
- The formula is evaluated:
pi * (od - wt) * wt * density * length - Result is formatted with the appropriate unit and precision
Calculation Example
Schedule 40 & 80 Pipe Weight Reference (Carbon Steel)
Approximate weight per meter for carbon steel pipe (density 7850 kg/m3):
NPS 1/2 in Sch 40 (21.3 mm OD, 2.77 mm WT): 1.27 kg/m | NPS 3/4 in (26.7, 2.87): 1.69 kg/m | NPS 1 in (33.4, 3.38): 2.50 kg/m | NPS 1.5 in (48.3, 3.68): 4.05 kg/m | NPS 2 in (60.3, 3.91): 5.44 kg/m | NPS 3 in (88.9, 5.49): 11.3 kg/m | NPS 4 in (114.3, 6.02): 16.1 kg/m | NPS 6 in (168.3, 7.11): 28.3 kg/m | NPS 8 in (219.1, 8.18): 42.5 kg/m | NPS 10 in (273.0, 9.27): 60.3 kg/m | NPS 12 in (323.9, 9.53): 73.9 kg/m.
Schedule 80 (heavier wall): NPS 2 in (60.3, 5.54): 7.48 kg/m | NPS 4 in (114.3, 8.56): 22.3 kg/m | NPS 6 in (168.3, 10.97): 42.6 kg/m.
Formula: W (kg/m) = pi x (OD - WT) x WT x rho / 1,000,000 with OD and WT in mm.
Worked Example: 6-inch Schedule 40
Calculate the weight of a 6 m length of 6-inch Schedule 40 carbon steel pipe (OD 168.3 mm, WT 7.11 mm).
Step 1 - metal area: A = pi x (OD - WT) x WT = pi x 161.19 x 7.11 = 3600 mm2 = 3.600 x 10^-3 m2.
Step 2 - volume: V = A x L = 3.600 x 10^-3 x 6 = 0.0216 m3.
Step 3 - weight: W = V x rho = 0.0216 x 7850 = 169.6 kg.
Check: 28.3 kg/m x 6 m = 169.6 kg. The pipe weighs approximately 170 kg.
Unit Conversion Guide
Weight per meter: 1 kg/m = 0.67197 lb/ft; 1 lb/ft = 1.488 kg/m.
Weight: 1 kg = 2.20462 lb; 1 tonne = 2204.6 lb.
Dimensions: 1 mm = 0.03937 in; 1 in = 25.4 mm.
Example: 16.07 kg/m = 16.07 x 0.67197 = 10.8 lb/ft for 4-inch Schedule 40.
Note: pipe weight is the metal only - it does not include the weight of the fluid inside or any insulation/coating.
Pipe Weight vs Total Installed Weight
The pipe weight formula gives the metal wall weight only. For structural loading and shipping you need the total installed weight:
Total per meter = pipe wall weight + fluid weight + insulation/coating weight.
Fluid weight per meter = pi x (ID/2)^2 x fluid density, where ID = OD - 2 x WT. For a 4-inch Schedule 40 pipe (ID 102.3 mm) full of water: pi x 0.0511^2 x 1000 = 8.2 kg/m. Add this to the 16.1 kg/m pipe weight to get 24.3 kg/m full of water. Insulation adds roughly 1-3 kg/m depending on thickness and density. Always use the total weight for pipe support spacing, hanger design and crane lifts.
Engineering Applications
- •Piping design
- •Structural support calculation
- •Transportation and rigging
- •Cost estimation
Frequently Asked Questions
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