Pipe & Duct Systems

Chain pipe segments with fittings and elevation changes. Outputs velocity, Reynolds number, flow regime, friction factor, and cumulative pressure drop per segment.

Build an air duct system resistance curve, overlay a fan H-Q curve to find the operating point. Supports round and rectangular ducts, fittings, and altitude/temperature density correction.

Plot your operating point on the Moody diagram — enter Re and ε/D to read friction factor. Includes flow regime shading, roughness curves, and hover crosshair.

API 520 Part I orifice area sizing for gas/vapour, steam, and liquid service. Selects the next standard API letter orifice designation.

Calculate Darcy friction factor using Moody chart correlations (laminar or turbulent).

Calculates thermal expansion ΔL = α·L·ΔT for pipes, sizes U/L/Z expansion loops from guided-cantilever beam theory, checks bending stress vs allowable, computes anchor force if fully restrained, and provides guide spacing. Covers CS, stainless steel, copper, aluminum, HDPE, PVC, CPVC, GRP. Two modes: size the loop or check stress for a given loop.

Calculate total head loss for pipes connected in series; same flow rate through each pipe.

Distribute flow across parallel pipe branches with equal head loss across each branch.

Calculate pressure surge from rapid valve closure using the Joukowsky equation.

Solve the implicit Colebrook-White equation iteratively for Darcy friction factor in turbulent pipe flow.

Calculate Darcy friction factor using the explicit Swamee-Jain approximation (error < 3%).

Calculate pipe flow velocity using the Hazen-Williams empirical formula for water supply systems.

Find the required pipe diameter to deliver a given flow rate within an allowable head loss budget.

Calculate the hydraulic gradient (head loss per unit length) for a pipe segment.

Heat loss per metre and total heat loss from bare or insulated pipes using the cylindrical resistance model. Covers mineral wool, PUR foam, aerogel and more.

Searchable ASME B36.10M/B36.19M pipe schedule table — OD, wall thickness, bore, flow area, and weight for carbon steel and stainless pipe from ⅛" to 12".

Darcy's law for permeable media (oil/gas/groundwater) and the Ergun equation for packed beds and granular filters. Computes pressure drop, flow rate, and flow regime.

LMTD and effectiveness-NTU sizing for counter-flow, parallel-flow, cross-flow, and 1-2 shell-and-tube exchangers. Solves for area, U-value, or achievable duty.

Searchable table of absolute roughness ε for 28 pipe and duct materials. Enter diameter and Reynolds number to compute ε/D and Darcy friction factor on the fly.

Nodal Newton-Raphson analysis (Hardy-Cross equivalent) for looped pipe networks. Solves flow distribution, HGL, and pressures at all nodes using Darcy-Weisbach / Colebrook-White.