Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

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Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more

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Absolute, Dynamic and Kinematic Viscosity

Dynamic, absolute and kinematic viscosities - convert between CentiStokes (cSt), centipoises (cP), Saybolt Universal Seconds (SSU) and degree Engler

Alternating Pumps

Securing a system and achieve equal wear by alternating pumps in parallel

BEP - Best Efficiency Point - Pump

Pump efficiency design

Boiling Fluids - Max Suction Flow Velocity

Recommended max suction flow velocity when pumping boiling fluids

Boiling Liquids - Max Pumping Flow Velocity

Recommended max flow velocity on the delivery (pressure) side when pumping boiling liquids


Cavitation occurs in fluid flow systems where the local static pressure is below vapor pressure

Centrifugal Pump Standards

Centrifugal pump design and dimension standards

Centrifugal Pumps

An introduction to Centrifugal Pumps

Centrifugal Pumps - Minimum Flow

Minimum continuous flow to prevent flashing in centrifugal pumps

Centrifugal Pumps - Speed Torque Curve

Centrifugal pumps and the characteristic speed torque curve

Centrifugal Pumps and Influence from Viscosity

When a liquid flow through a pump, hydrodynamic losses depends on fluid viscosity

Centrifugal Pumps and Shut-Off Head

Centrifugal pumps and maximum (shut-off) head

Centrifugal Pumps Modulated Capacity

Adapting pump capacity to variable process demand

Classifications of Pumps

Selecting between Centrifugal Pumps and Positive Displacement Pumps

Condensate Pumping

High temperatures and danger of impeller cavitation is the major challenge of condensate pumping

Converting Pump Head to Pressure and Vice Versa

Converting head (ft or m) to pressure (psi or bar, kg/cm2) and vice versa

Flow Units Converter

Convert between volume flow units - gpm, liter/sec, cfm, m3/h - an online flow unit calculator

Head Rise and the Energy Equation - for Pump or Fan

The energy equation can be used to calculate head rise in pumps or fans

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Light Oil Pumping Flow Velocity

Max light oil flow velocity on pump delivery side

Light Oil Suction Flow Velocity

Recommended suction flow velocity when pumping light oils

Mechanical Energy and the Bernoulli Equation

The mechanical energy equation related to energy per unit mass, energy per unit volume and energy per unit weight involving head

NEMA Frame Assignments

NEMA Frame Assignments

NPSH - Net Positive Suction Head

An introduction to pumps Net Positive Suction Head - NPSH

Positive Displacement Pumps

Introduction tutorial to positive displacement pumps basic operating principles

Power Gained by Fluid from Pump or Fan

The power gained by fluid from an operating pump or fan

Pressure to Head - Unit Converter

Convert between pressure and head units - like lb/in2, atm, inches mercury, bars, Pa and more ..

Pressure Units - Online Converter

Convert between pressure units like Pa,  bar, atmosphere, pound square feet, psi and more

Pump - Volume Flow and Temperature Rise

Calculate temperature rise in pumps

Pump Affinity Laws

Turbo machines affinity laws can be used to calculate volume capacity, head or power consumption in centrifugal pumps with changing speed or wheel diameters

Pump and Fan Efficiency

Overall pump and fan efficiency is the ratio power actually gained by the fluid to the shaft power supplied

Pump Power Calculator

Calculate pump hydraulic and shaft power

Pump Suction Head vs. Altitude

The suction heads of pumps are affected by altitude

Pumping Water - Energy Cost Calculator

The energy costs of pumping water

Pumping Water - Required Horsepower

Horsepower required to pump water

Pumps - Suction Specific Speed

Suction Specific Speed can be used to determine stable and reliable operations for pumps with max efficiency without cavitation

Pumps in Parallel or Serial

For pumps connected in serial - add head, for pumps connected in parallel - add flowrates

Pumps, Compressors, Blowers and Fans

Comparing pumps, compressors, blowers and fans

Pumps, Fans and Turbines - Horsepower

British Horse Power in pumps, fans and turbines - and how to convert to other units

Specific Speed Pumps

Characterize the type of impeller in pump in a unique and coherent manner

Specific Work done by Turbo Machines - Pumps, Compressors and Fans

Specific work from pumps, fans, compressors and turbines

Stable and Unstable Centrifugal Pumps

Characteristics of stable and unstable centrifugal pumps

Static Pressure vs. Head

Static pressure and pressure head in fluids

System Curve and Pump Performance Curve

Utilize the system curve and the pump performance curve to select the proper pump for a particular application

Vapor Pressures common Liquids

Vapor and saturation pressure for some common liquids

Viscosity Converting Chart

Convert between the viscosity units Centiposes, milliPascal, CentiStokes and SSU

Viscous Fluids - Recommended Suction Flow Velocity

Recommended pump suction flow velocity for viscous fluids

Viscous Liquids - Recommended Delivery Flow Velocity

Flow velocities on delivery sides of pumps in viscous systems

Water - Suction Flow Velocity

Recommended water flow velocities on suction sides of pumps

Water Flow - Delivery Velocity

Required maximum flow velocity in water systems - delivery side of the pump

Water Pump Calculator

Calculate Pressure Head, Total Dynamic Head, Bowl Horsepower, Total Trust acting on Driver Thrust Bearing, Field Head, Power Loss due to Shafting, Power Loss in Thrust Bearings, Motor Load, Field Efficiency, Input Horsepower (Power Supplied to Driver) and Shaft Elongation


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Unit Converters



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naut miles

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us gal

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Pa (N/m2)
mm H2O
inches H2O

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US gpm

Load Calculator!

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