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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 calculator 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.
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.
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.
Flow Rate & Pipe Velocity Calculator
Calculate flow rate, average pipe velocity, or the actual inside diameter needed for a selected velocity.
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.
Pipe Friction Loss & Pressure Drop Calculator
Estimate straight-pipe and fitting losses with Darcy–Weisbach, including head loss, pressure drop, and flow regime.
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.
Pipe Volume Calculator
Calculate the internal capacity of a full circular pipe from its actual inside diameter and length.
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.
Pressure Head Converter
Convert pressure to feet or meters of liquid head—or head back to pressure—while accounting for liquid specific gravity.
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.
Slurry Density & Solids Concentration Calculator
Convert solids concentration by mass or volume into usable slurry density, specific gravity, and the equivalent concentration basis.
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.
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.
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.
Pump Power & Electric Motor Load Calculator
Calculate pump power from hydraulic output through motor electrical input.
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
NPSH Available Calculator & Suction Margin
Calculate NPSH available and compare it with pump NPSH required to review cavitation margin.
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.
Pump Affinity Laws Calculator
Compare a known pump operating point with the corresponding point at a new rotational speed.
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.
Hydraulic Motor Torque & Speed Calculator
Estimate hydraulic motor running speed, shaft torque, power output, and estimated motor loss.
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.
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.
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.
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.
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?
The calculators give a clear-liquid baseline, and solids raise density and friction, so a slurry correction is needed for high-solids service. EDDY Pump's non-clog pumps are built specifically to move 40–70% solids — request a quote or a custom pump curve to size the right one for your application.