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 Pipe Pressure Loss Calculator Wall drag and changes in height lead to pressure drops in pipe fluid flow. To calculate the pressure drop and flowrates in a section of uniform pipe running from Point A to Point B, enter the parameters below. The pipe is assumed to be relatively straight (no sharp bends), such that changes in pressure are due mostly to elevation changes and wall friction. (The default calculation is for a smooth horizontal pipe carrying water, with answers rounded to 3 significant figures.) Note that a positive Dz means that B is higher than A, whereas a negative Dz means that B is lower than A.
Inputs
 Pressure at A (absolute): Pa psi atm inHg inH2O ftH2O kPa Mpa mmHg Average fluid velocity in pipe, V: m/s cm/s ft/s mph in/s Pipe diameter, D: m in ft cm Pipe relative roughness, e/D: m/m in/in Pipe length from A to B, L: m in ft cm km mi Elevation gain from A to B, Dz: m in ft cm Fluid density, r: kg/m^3 lb/in^3 kg/l Fluid viscosity (dynamic), m: cP Pa-s kg/m-s slug/ft-s
 Reynolds Number, R: 1.00 × 105 Friction Factor, f: 0.0180 Pressure at B: 95.5  kPa Pa psi atm inHg inH2O ftH2O kPa Mpa mmHg Pressure Drop: 4.50  kPa Volume Flowrate: 7.85  l/s m^3/s l/s ft^3/s in^3/s cm^3/s gal/s qt/s gpm Mass Flowrate: 7.85  kg/s kg/s slug/s lbm/s

Hint: To Calculate a Flowrate

You can solve for flowrate from a known pressure drop using this calculator (instead of solving for a pressure drop from a known flowrate or velocity).

Proceed by guessing the velocity and inspecting the calculated pressure drop. Refine your velocity guess until the calculated pressure drop matches your data.

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Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.