Evaluate tank loads, soil pressure, stability, settlement, concrete reinforcement, anchors, piles, quantities, costs, and design warnings within one comprehensive workflow.
The calculator converts all entered values into an internal SI model. It calculates operating, maximum, hydrotest, and empty tank conditions separately.
This linear pressure model is suitable for preliminary sizing. Contact loss requires nonlinear soil or compression-only support analysis.
Passive resistance should be excluded when soil confinement, maintenance excavation, drainage trenches, or displacement compatibility make it unreliable.
The settlement equation is an elastic screening estimate. Layered soils, consolidation, creep, and circumferential shell settlement require geotechnical analysis.
Recommended spacing is preliminary. Final design must check crack control, development, lap splices, anchorage zones, openings, and construction joints.
These expressions assume regular circular layouts and simplified elastic distribution. Stiffness compatibility and concrete anchorage checks remain necessary.
Do not proceed directly from this preliminary output to construction. Reconcile the results with certified tank reactions, geotechnical recommendations, current codes, detailed drawings, and project specifications.
Configure project identity, design standard, unit system, risk category, revision data, calculation precision, strength or allowable design basis, and custom safety factors.
Design note: Record the exact governing code edition and local amendments. Keep design assumptions visible in the report.
Define tank diameter, shell height, roof geometry, bottom slope, liquid levels, overflow level, shell-course data, annular plate information, and centerline coordinates.
Design note: Geometry drives liquid weight, environmental projected area, lever arms, and foundation footprint checks.
Choose welded, bolted, ground-supported, standpipe, roofed, open-top, anchored, or unanchored behavior.
Design note: Manufacturer reaction data should govern whenever certified reactions are available.
Combine shell, roof, bottom, columns, appurtenances, insulation, ladders, platforms, maintenance loading, and stored liquid.
Design note: Review every component against current fabrication drawings before issue for construction.
Enter certified dead load, operating load, hydrotest load, base shear, overturning moment, torsion, anchor tension, and nozzle reactions.
Design note: Avoid adding automatic loads twice when manufacturer reactions already include them.
Specify specific gravity, operating depth, maximum depth, hydrotest depth, sediment depth, sediment density, overfill, and temperature range.
Design note: Sediment may govern long-term vertical load even when it is neglected during early sizing.
Evaluate granular pads, ringwalls, ringwalls with slabs, full mats, pile-supported systems, and pedestal arrangements.
Design note: The least expensive geometry is not always the lowest-risk foundation system.
Set inner and outer diameters, depth, embedment, above-grade projection, fill elevation, shoulder width, and ring centering.
Design note: Confirm that shell load enters the ringwall without unsupported eccentric bearing.
Set mat diameter, thickness, edge thickening, local pedestals, construction joints, sumps, penetrations, and drainage details.
Design note: Large mats often need refined soil-spring or finite-element analysis.
Choose concrete strength, density, modulus assumptions, durability exposure, cover, aggregate size, and environmental service requirements.
Design note: Water-retaining and environmental exposure may require stricter crack control than ordinary building work.
Choose reinforcing yield strength, bar diameter, metric or US bar systems, welded wire reinforcement, coating, and corrosion protection.
Design note: Check congestion at anchor chairs, pipe penetrations, and ringwall construction joints.
Enter allowable and ultimate bearing values, soil modulus, subgrade modulus, friction, cohesion, friction angle, and passive pressure coefficient.
Design note: These parameters should come from a site-specific geotechnical report.
Document multiple soil layers, groundwater, collapsible zones, expansive materials, liquefiable layers, and competent bearing strata.
Design note: A single modulus cannot represent every layered soil profile reliably.
Check uplift from groundwater beneath embedded foundations and evaluate empty-tank stability.
Design note: Construction dewatering can conceal permanent buoyancy risk after the site is placed in service.
Compare embedment against frost depth and account for heave-prone or moisture-sensitive materials.
Design note: Provide drainage and nonfrost-susceptible fill where required.
Calculate wind pressure, shell force, roof contribution, base shear, overturning moment, directionality, exposure, and topographic effects.
Design note: Empty-tank wind commonly governs anchorage and overturning.
Estimate impulsive and convective liquid components, seismic shear, moment, sloshing contribution, importance, response factor, and site effects.
Design note: Detailed tank seismic design should follow the selected tank standard and project criteria.
Add hydrostatic flood effects, current drag, wave demand, scour concerns, and buoyancy.
Design note: Flood loads may act concurrently with reduced tank contents.
Add roof environmental loads and consider eccentric accumulation or maintenance conditions.
Design note: Roof reactions can increase shell or column loads transferred to the foundation.
Record thermal change, differential temperature, foundation restraint, joint movement, and piping expansion reactions.
Design note: Tank shell growth should not be restrained unintentionally by grout or concrete projections.
Evaluate empty, operating, maximum level, hydrotest, wind, seismic, flood, construction, and accidental cases.
Design note: Clearly distinguish service, strength, uplift, and settlement combinations.
Calculate average, maximum, minimum, gross, net, eccentric, and partially uplifted contact pressure indicators.
Design note: Linear pressure is a preliminary assumption when soil contact is lost.
Combine interface friction, passive resistance, shear keys, anchor shear, and applied horizontal forces.
Design note: Use passive resistance only when permanent soil confinement and displacement compatibility are justified.
Compare overturning moments with stabilizing tank weight, foundation weight, soil cover, and effective lever arms.
Design note: Do not count the same resistance in both stability and structural anchorage checks without justification.
Estimate immediate, consolidation, total, differential, edge, center, and tilt-related settlement indicators.
Design note: Tank shells can be sensitive to circumferential settlement even when average settlement is acceptable.
Estimate vertical and circumferential reinforcement demands from local pressure and shell bearing effects.
Design note: Refined ring analysis may be required for large tanks or irregular reactions.
Estimate radial and circumferential bending, one-way shear, punching shear, and reinforcement spacing.
Design note: Opening and sump reinforcement should be designed separately.
Check minimum reinforcement, bar spacing, cover, shrinkage, temperature effects, and environmental exposure.
Design note: Crack control can govern before flexural strength does.
Check effective bolt area, corrosion allowance, tensile strength, combined demand, and maximum anchor tension.
Design note: Threaded root area and actual material certification should be used for final design.
Consider breakout, pullout, pryout, side-face blowout, edge distance, group effects, and reinforcement transfer.
Design note: The simplified steel check does not replace a complete anchorage design.
Design chair plates, stiffeners, shell attachments, welds, grout bearing, and local concrete reinforcement.
Design note: Chair flexibility can redistribute anchor forces.
Estimate uplift length, contact reduction, toe compression, rocking, annular plate demand, and empty-tank behavior.
Design note: A nonlinear shell-bottom-foundation model may be necessary for critical facilities.
Estimate average, maximum compression, tension, and lateral pile reactions from vertical load and overturning.
Design note: Pile stiffness and group interaction influence actual load distribution.
Set pile count, diameter, spacing, circle diameter, capacity, stiffness, and cap connection.
Design note: Avoid placing piles where anchor sleeves, sumps, or piping will conflict.
Record replacement fill, stone columns, rigid inclusions, deep mixing, compaction, or preload assumptions.
Design note: Improvement verification testing should be part of the construction quality plan.
Define pad crown, apron slope, perimeter drains, underdrains, leak detection, capillary breaks, and erosion protection.
Design note: Poor drainage can undermine settlement assumptions and corrosion protection.
Address sulfate, chloride, freeze-thaw, corrosion, coatings, waterproofing, joint sealants, and cathodic protection isolation.
Design note: Detail grounding and cathodic systems to avoid unintended electrical paths.
Lay out joints, keys, waterstops, dowels, pour sequencing, and temporary stability.
Design note: Joint locations should avoid peak shell and anchor demands.
Estimate concrete, reinforcement, excavation, fill, anchors, piles, drainage aggregate, and formwork.
Design note: Quantities are conceptual and should be reconciled with drawings and specifications.
Apply editable regional unit costs for concrete, reinforcement, excavation, fill, anchors, and piles.
Design note: Exclude taxes, contractor overhead, mobilization, testing, and escalation unless entered separately.
Estimate concrete and reinforcing emissions using editable project factors.
Design note: Use supplier environmental product declarations for procurement decisions.
Search candidate diameters and identify options meeting bearing, sliding, and overturning criteria.
Design note: Optimization does not replace constructability, settlement, or detailed concrete checks.
Flag missing values, inconsistent heights, negative dimensions, excessive friction, shallow embedment, and contact loss.
Design note: Warnings must be reviewed rather than hidden before report issue.
Generate a printable summary, detailed load-case table, formulas, assumptions, warnings, quantities, and design status.
Design note: Keep revision history and engineer review fields in the final calculation package.
Use the application for preliminary sizing, coordination, and independent checking.
Design note: Final design requires site-specific information and professional engineering judgment.
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Checked by: ___________________________________ Date: __________________
Approved by: __________________________________ Date: __________________
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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.