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21 CALCULATORS / 3 ANALYSES & GUIDES

Calculators and Engineering Tools

Practical engineering tools and analyses to help you size slurry and dredging systems and keep operating costs under control. Use our interactive calculators to work through the numbers, then turn to our cost and lifecycle analyses to make decisions based on system behavior, not assumptions — so you can evaluate performance, reduce operational costs, and improve efficiency across applications.

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Find the calculation you need

Compare the tool summaries, then open a calculator. Expand a card to see its best use, required inputs and outputs before you start.

01 / FLOW & HEAD

Total Dynamic Head (TDH) Calculator

Estimate the head your pump needs to overcome, from flow rate and pipe run to elevation change and fittings, in US or metric units. It breaks out static lift, pipe friction, fitting losses, and velocity head, with an optional suction-line calculation, so you get a defensible number in seconds instead of waiting on a quote.

Calculate TDH

Inputs, outputs & best fit

Best for

A fast, first-pass TDH estimate when scoping discharge lines and preparing to discuss pump sizing with an engineer.

Inputs

Flow rate · discharge ID & pipe material · line length · net elevation change · fittings (elbows, valves, check valves) · optional suction line.

Output

Total dynamic head, with static lift, pipe friction, fitting and velocity-head breakdown.

02 / FLOW & HEAD

Flow Rate & Pipe Velocity Calculator

Calculate flow rate, average pipe velocity, or the actual inside diameter needed for a selected velocity.

Calculate pipe flow

Inputs, outputs & best fit

Best for

Checking full-pipe flow duties, comparing pipe or hose sizes, and documenting slurry-mixture velocity.

Inputs

Calculation mode, actual pipe inside diameter, flow rate, average or target velocity, and US or metric units.

Output

Solved flow rate, average velocity, or inside diameter, plus cross-sectional area and equivalent units.

03 / FLOW & HEAD

Pipe Friction Loss & Pressure Drop Calculator

Estimate straight-pipe and fitting losses with Darcy–Weisbach, including head loss, pressure drop, and flow regime.

Calculate friction

Inputs, outputs & best fit

Best for

Establishing a Newtonian-liquid pipeline-loss reference before building total system head.

Inputs

Actual ID, pipe length, operating flow, roughness, viscosity, specific gravity, fitting-loss coefficient, and head-loss unit.

Output

Total, straight-pipe, and fitting head loss; pressure drop; velocity; Reynolds number; flow regime; and friction factor.

04 / VOLUME & WEIGHT

Pipe Volume Calculator

Calculate the internal capacity of a full circular pipe from its actual inside diameter and length.

Calculate pipe volume

Inputs, outputs & best fit

Best for

Estimating line-fill, flushing, hydrotest, drainage, and transfer volumes.

Inputs

Actual pipe inside diameter, pipe length, US or metric units, and selected output-volume unit.

Output

Internal pipe volume, equivalent volume units, and cross-sectional area.

05 / FLOW & HEAD

Pressure Head Converter

Convert pressure to feet or meters of liquid head—or head back to pressure—while accounting for liquid specific gravity.

Convert pressure/head

Inputs, outputs & best fit

Best for

Translating pressure readings and equipment requirements into pump-curve head units.

Inputs

Conversion direction, pressure difference and unit, liquid head and unit, liquid specific gravity, and result unit.

Output

Equivalent pressure or liquid head in selected and equivalent units.

06 / SLURRY & PRODUCTION

Slurry Density & Solids Concentration Calculator

Convert solids concentration by mass or volume into usable slurry density, specific gravity, and the equivalent concentration basis.

Calculate slurry density

Inputs, outputs & best fit

Best for

Characterizing slurry samples and preparing material data for pump or pipeline reviews.

Inputs

Known concentration basis, solids concentration, dry particle density, carrier-liquid density, and primary density unit.

Output

Slurry density, specific gravity, equivalent mass- or volume-based solids concentration, and solids and liquid quantities per cubic meter.

07 / VOLUME & WEIGHT

Tank Volume & Pump Down Time Calculator

Find current volume, total tank capacity, and volume between liquid levels; estimate pump-down time using discharge flow and continuous inflow.

Calculate pump-down

Inputs, outputs & best fit

Best for

Planning storage, transfer, and pump-down operations for horizontal cylindrical, vertical cylindrical, and rectangular tanks.

Inputs

Tank geometry, internal dimensions, current and target liquid depth, pump discharge flow, continuous inflow, and selected volume unit.

Output

Current volume, total capacity, removable volume, remaining volume, net removal rate, and ideal pump-down time.

08 / PUMP PERFORMANCE

Pump Power & Electric Motor Load Calculator

Calculate pump power from hydraulic output through motor electrical input.

Calculate pump power

Inputs, outputs & best fit

Best for

Estimating hydraulic power, pump shaft demand, motor sizing, and expected electrical loading for a defined mixture duty point.

Inputs

Delivered mixture flow · total pump head · mixture specific gravity · pump efficiency · mechanical-drive efficiency · motor efficiency · optional motor rated shaft output.

Output

Hydraulic power · pump shaft power · motor shaft output needed · electrical input power · motor load percentage.

Electricity to Liquid
Ph = ρgQH
Pshaft = Ph ÷ ηpump
Pmotor = Pshaft ÷ ηdrive
Pelectric = Pmotor ÷ ηmotor

09 / PUMP PERFORMANCE

NPSH Available Calculator & Suction Margin

Calculate NPSH available and compare it with pump NPSH required to review cavitation margin.

Calculate NPSH

Inputs, outputs & best fit

Best for

Screening suction conditions, reviewing available suction margin, and identifying potential cavitation concerns before detailed pump selection.

Inputs

Liquid temperature and vapor-pressure conditions · atmospheric or vessel pressure · static suction lift or head · suction-line losses · pump NPSH required.

Output

NPSH available and the comparison against NPSH required, making the available suction margin visible.

Adequate margin helps reduce cavitation risk. Check results across the full operating range, not only at one duty point.

10 / PUMP PERFORMANCE

Pump Affinity Laws Calculator

Compare a known pump operating point with the corresponding point at a new rotational speed.

Compare pump speeds

Inputs, outputs & best fit

Best for

Quick speed-change comparisons, preliminary variable-speed-pump estimates, and scaled flow, head, and power checks.

Inputs

Reference RPM · proposed RPM · reference flow · reference head · actual absorbed pump shaft power.

Output

r = N₂/N₁
Q₂ = Q₁ × r
H₂ = H₁ × r²
P₂ = P₁ × r³

This estimates a corresponding point on a scaled pump curve; actual operation depends on the system curve.

11 / HYDRAULIC EQUIPMENT

Hydraulic Motor Torque & Speed Calculator

Estimate hydraulic motor running speed, shaft torque, power output, and estimated motor loss.

Calculate motor output

Inputs, outputs & best fit

Best for

Preliminary hydraulic motor sizing, checking expected speed and torque, and translating hydraulic input conditions into shaft output.

Inputs

Motor inlet oil flow · pressure drop · displacement per revolution · volumetric efficiency · mechanical efficiency · torque units · power units.

Output

n = 60Qηv/D
T = ΔpDηm/(2π)
Pin = ΔpQ
Pout = Pin × ηv × ηm

Flow sets speed and pressure differential sets torque. Confirm manufacturer limits before applying the estimate.

12 / VOLUME & WEIGHT

Pipe Weight Calculator

Estimate empty and filled pipe weight for steel, HDPE, PVC and other materials.

Calculate pipe weight

Inputs, outputs & best fit

Best for

Preparing line-weight estimates for handling and planning, with pipe contents and additional allowances kept visible.

Inputs

Pipe outside diameter and wall thickness or inside diameter; material density; length and quantity; fill density; fittings and other allowances.

Output

Pipe mass per unit length, empty pipe mass, contained-fluid mass and combined line weight.

13 / FLOW & HEAD

Open Channel Flow Calculator

Calculate open-channel flow or normal depth using Manning’s equation for three channel shapes.

Calculate channel flow

Inputs, outputs & best fit

Best for

Comparing rectangular, trapezoidal and triangular channels under a steady, uniform-flow assumption.

Inputs

Channel shape and dimensions, bed slope, Manning roughness, known depth or target flow, and bank depth for a freeboard check.

Output

Flow or normal depth, velocity, wetted area, hydraulic radius and the freeboard comparison.

14 / HYDRAULIC EQUIPMENT

Nozzle Flow Rate Calculator

Calculate nozzle flow, required pressure or bore size from the liquid duty.

Calculate nozzle flow

Inputs, outputs & best fit

Best for

Estimating nozzle demand and comparing the effect of pressure, bore size, quantity and nozzle wear.

Inputs

Calculation mode, bore diameter, differential pressure or target flow, discharge coefficient, liquid density and nozzle quantity.

Output

Flow per nozzle and total demand, required differential pressure or bore size, plus a nozzle-wear comparison.

15 / HYDRAULIC EQUIPMENT

Hydraulic Cylinder Calculator

Estimate cylinder force, movement speed and cycle time in both directions.

Calculate cylinder duty

Inputs, outputs & best fit

Best for

Comparing extension and retraction duty while keeping backpressure and return flow visible.

Inputs

Bore and rod diameter, stroke, supply and return pressure, supplied flow and the stated efficiency assumptions.

Output

Extension and retraction force, speed, travel time and return flow, with a cycle-time estimate.

16 / HYDRAULIC EQUIPMENT

Valve Cv Calculator

Find liquid valve Cv, flow or pressure drop and convert between Cv and Kv.

Calculate valve Cv

Inputs, outputs & best fit

Best for

Checking a preliminary liquid-flow coefficient or comparing pressure loss at different flows.

Inputs

Known flow, valve coefficient or differential pressure; liquid specific gravity; selected Cv or Kv basis and units.

Output

Required coefficient, solved flow or pressure drop, equivalent Cv/Kv and flow-sensitivity comparisons.

17 / PUMP PERFORMANCE

Pump Operating Point Calculator

Find the intersection of a supplied pump curve and a calculated system curve.

Find operating point

Inputs, outputs & best fit

Best for

Comparing one pump configuration with a defined system and testing changes in flow-dependent resistance.

Inputs

Two to thirty pump flow/head pairs, static head, a reference flow and the system loss at that reference flow.

Output

Operating flow and head within the entered curve range, an intersection plot, friction head and resistance comparisons.

18 / FLUID PROPERTIES

Viscosity Converter

Convert dynamic and kinematic viscosity using density at the same fluid condition.

Convert viscosity

Inputs, outputs & best fit

Best for

Converting data-sheet units without losing the density, temperature or test-condition basis.

Inputs

Known dynamic or kinematic viscosity, its unit, fluid density and an optional temperature or test-condition note.

Output

Equivalent cP, cSt, SI and US viscosity units, plus sensitivity to the entered density. The note does not apply a temperature correction.

19 / FLOW & HEAD

Water Hammer Calculator

Estimate the pressure-rise benchmark for a rapid reduction in liquid velocity.

Estimate water hammer

Inputs, outputs & best fit

Best for

Screening a deceleration event and comparing its duration with the pressure-wave reflection time.

Inputs

Initial flow and inside diameter or velocity; final velocity; liquid density; wave speed; reflection-path length; change time and initial gauge pressure.

Output

Joukowsky pressure-rise benchmark, head rise, reflection time and wave-speed sensitivity. Slower events are identified without predicting a transient peak.

20 / SLURRY & PRODUCTION

Slurry Dilution Calculator

Calculate the solids-free liquid addition needed to reach a lower slurry concentration.

Calculate dilution

Inputs, outputs & best fit

Best for

Planning dilution while preserving dry solids throughput and exposing the increase in total flow.

Inputs

Feed slurry flow, concentration by mass or volume, target concentration, solids particle density and carrier-liquid density.

Output

Required liquid addition, final slurry flow and density, equivalent concentrations and a mass-balance check.

21 / SLURRY & PRODUCTION

Dredging Production Calculator

Estimate dry solids throughput, in-situ production and working days for a target quantity.

Estimate production

Inputs, outputs & best fit

Best for

Building a production scenario from productive pumping conditions, deposit properties and available operating time.

Inputs

Productive slurry flow and concentration, particle and carrier density, in-situ dry bulk density, scheduled hours, productive-time share and optional target volume.

Output

Dry solids and in-situ production per hour and working day, effective pumping time, implied porosity and target-volume duration.

HOW TO USE THESE TOOLS

Suggested order for sizing a pumping system

The calculators work best as a sequence, because each result feeds the next. This is a common order for a first-pass duty.

1Material→2Flow & pipe→3Losses→4Duty head→5Suction→6Drive

Describe the material

Turn a solids percentage into a mixture density and specific gravity.

YOU GET

Specific gravity Mixture density

↳ Feeds steps 4 & 6

CALCULATOR

Slurry Density & Solids Concentration

Set the flow and pipe

Check velocity for your actual inside diameter, and the fill volume of the line.

YOU GET

Velocity Line volume

↳ Feeds step 3

CALCULATORS

Flow Rate & Pipe Velocity

Pipe Volume

Estimate the losses

Get friction and fitting losses for each pipe section.

YOU GET

Friction head Pressure drop

↳ Feeds step 4

CALCULATOR

Pipe Friction Loss & Pressure Drop

Build the duty head

Add static lift and velocity head, and convert any pressure requirement into head.

YOU GET

Total dynamic head

↳ Feeds steps 5 & 6

CALCULATORS

TDH Calculator

Pressure Head Converter

Check suction

Compare the available suction margin with the pump's NPSH required.

YOU GET

NPSH available Cavitation margin

↳ Compare with the pump's NPSHr

CALCULATOR

NPSH Available

Size the drive

Find shaft and electrical power, test a speed change, or match a hydraulic motor.

YOU GET

Shaft power Motor size Speed

↳ Completes the first-pass duty

CALCULATORS

Pump Power & Motor Load

Pump Affinity Laws

Hydraulic Motor Torque & Speed

These are clear-liquid, first-pass estimates. Confirm your duty point, slurry correction and NPSH with EDDY Pump engineering before purchasing or installing equipment.

Request a pump duty review →

COST / LIFECYCLE / PIPELINE REFERENCE

Engineering Analyses & Guides

In-depth analyses and reference guides — not calculators — to inform cost, lifecycle, and pipeline decisions.

Dredge Production Cost Analysis

Evaluate the cost of dredging operations based on production rates, material handling, and system efficiency. Estimate operational expenses and identify cost drivers across dredging projects.

Read the analysis

Pump Total Cost of Ownership Analysis

Understand the full lifecycle cost of a pump system, including energy usage, maintenance, and wear — a clearer picture of long-term operating costs beyond initial equipment investment.

Read the analysis

HDPE Pipe & Bauer Fittings Guide

See how Bauer fittings are used with HDPE pipelines for faster connection and disconnection in industrial systems — guidance for pipeline setup where flexibility and installation efficiency are critical.

View the guide

CONNECT THE CALCULATIONS

Start with the question. Follow the quantities.

These three routes show how to use related tools together while keeping their assumptions visible.

01 / DEFINE A PIPELINE DUTY

Build the duty before comparing pumps.

Flow and velocity establish the flow basis. Add pipe friction and elevation through the TDH calculation. Then compare the supplied pump curve with the system operating point.

Carry the same flow, actual inside diameter and fluid basis through each calculation.

02 / PLAN A SOLIDS TARGET

Separate dry solids from added water.

Slurry density makes the concentration basis explicit. Use dilution to test water addition and dredging production to translate productive pumping into dry solids and in-situ output.

Mixture volume, true-particle volume and in-situ deposit volume are different quantities.

03 / CHECK THE OPERATING CONDITIONS

Look beyond a single head-and-flow result.

NPSH available reviews the suction side. Pump power estimates the power chain. The water hammer tool gives a stated rapid-change benchmark for a velocity reduction.

A steady operating point does not describe every suction, starting, stopping or transient condition.

BEFORE YOU CALCULATE

Better inputs make a useful comparison.

A quick estimate becomes easier to review when the dimensions, material data and operating conditions have a clear source.

Record the physical basis

Use actual pipe inside diameter, measured or specified lengths, and the relevant elevation change. State whether pressure is gauge or absolute where the calculator asks for that distinction.

For slurry, record whether concentration is by mass or volume. Keep particle density, carrier-liquid density and dry bulk density separate; they serve different parts of a material balance.

Keep the operating assumptions

Retain the pump curve, speed, fluid condition, efficiency assumptions and source of the flow estimate. For production planning, distinguish productive pumping time from scheduled time.

Where a tool provides a report, keep it with the project inputs. For a pump review, add the material description, particle information, suction conditions and full discharge route.

Request a custom pump curve

PRACTICAL QUESTIONS

Frequently Asked Questions

Who are these calculators and analyses for?

Engineers, project managers, and operators specifying or running slurry and dredging systems. They're built for quick, defensible scoping — whether you're planning a new installation, comparing options, or getting ready to talk to a pump specialist.

Do I need an account, and is there a cost?

No. Every calculator, analysis, and guide on this page is free to use, with no login or download required.

Do these tools replace a formal pump selection?

No. They're designed for fast, first-pass estimates and planning, not final selection. Confirm your duty point, slurry correction, and NPSH with EDDY Pump engineering before purchasing or installing equipment.

Can I use them for high-solids slurry?

Use the calculator whose model matches the question. Slurry density, dilution and production tools use solids concentration and material balances; several pipe-loss and liquid-flow tools use stated Newtonian-liquid assumptions. A clear-liquid loss calculation does not establish slurry transport performance. EDDY Pump equipment is designed for high-solids service, but the suitable concentration and pump duty depend on the material and system. Request a custom pump curve and engineering review for the application.

Which tool should I use first?

For a pipeline duty, begin with flow and actual pipe inside diameter, then estimate friction and total dynamic head. For a solids-production target, establish the concentration basis and densities first. The workflow section above links the relevant tools in those sequences.

Can I use US customary and metric units?

The calculators provide unit controls appropriate to their inputs and outputs. Check each displayed unit before entering a value. Where mass output is offered, distinguish metric tonnes from US short tons; do not treat them as the same quantity.

Can I use one result for every operating condition?

No. Flow, liquid level, material concentration, temperature, pump speed and the discharge route can change during operation. Calculate the relevant scenarios separately and keep their inputs with each result. A single calculated point does not describe the complete operating range.

Are the analyses and guides interactive calculators?

No. The three resources in the Engineering Analyses & Guides section are reading resources covering dredging cost, pump lifecycle cost and HDPE/Bauer connections. The calculator cards link to the interactive engineering tools.