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Pipe Weight & Section Properties

Pipe weight, fluid weight, moment of inertia, section modulus & radius of gyration per ASME B36.10 (carbon steel, NPS ⅛–80) & B36.19 (stainless steel, NPS ⅛–30) / Nayyar 7th Ed.

Pipe weight & section properties
Piping Handbook 7th Ed. (Nayyar) formulas
Select pipe size (ASME B36.10)
Select NPS and schedule above
Auto-filled (read only)
—
From ASME B36.10
—
From ASME B36.10
Your inputs
Water=1.0 · Crude oil≈0.85
Section properties
Inside diameter ID
—
inches
Metal area Am
—
in²
Flow area Ai
—
in²
Moment of inertia I
—
in⁴
Section modulus Z
—
in³
Radius of gyration r
—
inches
Weight
Pipe weight/ft
—
lb/ft
Fluid weight/ft
—
lb/ft
Total weight/ft
—
lb/ft
Pipe total
—
lb
Fluid total
—
lb
Grand total
—
lb
Piping Handbook 7th Ed. — Nayyar:
ID=OD−2t · Am=0.7854(OD²−ID²) · I=0.0491(OD⁴−ID⁴)
Z=0.0982(OD⁴−ID⁴)/OD · Pipe wt/ft=10.69×t×(OD−t)
Fluid wt/ft=0.3405×ID²×SG
Verify pipe dimensions against ASME B36.10 or B36.19 before use in design.
Pipe weight & section properties — Stainless Steel
ASME B36.19M · Piping Handbook 7th Ed. (Nayyar) formulas
Select pipe size (ASME B36.19)
Select NPS and schedule above
Auto-filled (read only)
—
From ASME B36.19
—
From ASME B36.19
Your inputs
Water=1.0 · Crude oil≈0.85
Section properties
Inside diameter ID
—
inches
Metal area Am
—
in²
Flow area Ai
—
in²
Moment of inertia I
—
in⁴
Section modulus Z
—
in³
Radius of gyration r
—
inches
Weight
Pipe weight/ft
—
lb/ft
Fluid weight/ft
—
lb/ft
Total weight/ft
—
lb/ft
Pipe total
—
lb
Fluid total
—
lb
Grand total
—
lb
Stainless Steel density = 0.2900 lb/in³ (≈ 7,900 kg/m³)
ID=OD−2t · Am=0.7854(OD²−ID²) · I=0.0491(OD⁴−ID⁴)
Z=0.0982(OD⁴−ID⁴)/OD · Pipe wt/ft=Am×12×0.2900
Fluid wt/ft=0.3405×ID²×SG
OD and wall thickness per ASME B36.19M. SS density 0.2900 lb/in³ vs 0.2833 lb/in³ for carbon steel — ensure correct standard is selected for your material.
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Formula Basis — ASME B36.10 / Nayyar 7th Edition
Pipe Metal Area: A = π/4 × (OD² − ID²)  [in²]
Pipe Weight (steel): wpipe = A × 12 × 0.2833  [lb/ft]  (ρsteel = 0.2833 lb/in³)
Fluid Weight: wfluid = π/4 × ID² × 12 × (ρfluid/1728)  [lb/ft]
Moment of Inertia: I = π/64 × (OD⁴ − ID⁴)  [in⁴]
Section Modulus: Z = I / (OD/2) = π/32 × (OD⁴ − ID⁴) / OD  [in³]
Radius of Gyration: r = √(I/A)  [in]
Wall thickness and OD values per ASME B36.10M (carbon steel) and B36.19M (stainless steel). Carbon/low-alloy steel density = 0.2833 lb/in³ (490 lb/ft³). Stainless steel density = 0.2900 lb/in³ — use the B36.19 tab for SS schedules 5S, 10S, 40S, 80S.
Reference Standards
StandardTitleRelevance
ASME B36.10MWelded and Seamless Wrought Steel PipeOD and wall thickness for NPS ⅛" to 80" (all schedules)
ASME B36.19MStainless Steel PipeOD and wall thickness for NPS ⅛" to 30" (Sch 5S/10S/40S/80S)
Nayyar, 7th Ed.Piping HandbookSection properties reference tables