Volume-vs-height gauge table from tank geometry — shell courses, bottom shape, deadwood, and floating roof displacement
◉ GEOMETRIC ENGINEERING MODEL · NOT A CERTIFIED CALIBRATION TABLE
⚠ Not a substitute for a certified tank calibration. This is a geometric model, not sourced from a specific standard the way the other calculators in this app are — custody-transfer-grade strapping tables are normally produced by physical tank calibration per API MPMS Chapter 2.2A (or equivalent), which accounts for as-built deviations this geometric model can't capture. Use measured (not nominal) circumferences per course for better accuracy if you have them. The bottom-shape and cone-volume math is exact for the two shapes offered (flat, and a uniformly-sloped center-sump cone) and has been independently verified against numerical integration. Floating roof displacement and non-cylindrical deadwood items are necessarily simplified — see the hints on those cards.
Identification
Research entries stay private to you for practice/testing. Switch to Official once this is a real table your company should see.
Shell Courses
Diameter can be nominal (design) or a measured circumference (real strapping practice). If you give a measured circumference and plate thickness, the tool converts to internal diameter: ID = Circumference/π − 2×thickness.
Course
Height ft
Diameter Source
Nominal ID ft
Measured Circumference ft
Plate Thickness in
Effective ID ft
Bottom Shape
Edge-sump (cone-up) bottoms and knuckle/dished bottoms aren't modeled — genuinely less common, and the liquid-pooling geometry is materially more complex to derive correctly.
Deadwood (Internal Obstructions)
Cylindrical items (columns, coil bundles approximated as a cylinder) deduct their exact cross-sectional volume over their submerged height range. "Fixed volume" items deduct a user-supplied total volume, spread linearly across their elevation range as a simplification.
Description
Type
Diameter in
Fixed Volume ft³
Qty
Bottom Elev ft
Top Elev ft
Floating Roof (optional)
Roof buoyancy/displacement is genuinely roof-design-specific engineering (pontoon vs. double-deck, ballast, etc.) — not something this tool derives from geometry alone. Enter the displacement volume from the roof's own design drawings/flotation calc if you have it; it's applied as a constant deduction once the liquid level is at or above the roof's landed height.
Generate Table
Summary
Total shell height—
Gross capacity (full height)—
Capacity at safe fill height—
Height (ft)
Volume (ft³)
Volume (bbl)
Volume (US gal)
Save Record
Saves the input geometry and summary capacity figures. The full row-by-row table stays local to this session — use Download CSV to keep a copy.