Simple Engineering Calculators
Quick, honest engineering estimates that run entirely in your browser. No accounts, no waiting on a server — pick a tool and start.
Screw Compressor — Natural Gas Throughput
Estimate MMSCFD, mass flow, brake horsepower and discharge temperature for Frick TDS and Kobelco KS rotary-screw compressors on natural gas. Real-gas density via Sutton + Dranchuk-Abou-Kassem.
Open calculator →CompressionCompression Temperature Rise
Find the discharge (final) temperature when a gas is compressed in one stage. Pick the gas and efficiency; works for air, natural gas and refrigerants. Enter a measured discharge temp to back out the real efficiency.
Open calculator →PumpsCentrifugal Pump Turn-Down & Selection
Slow a pump (VFD) or trim its impeller with the affinity laws and find the real operating point on your system curve — flow, head, efficiency, brake HP, NPSH margin, minimum speed before dead-head, and VFD-vs-throttle energy savings. Grundfos CRN and common ANSI pumps built in, plus custom curves.
Open calculator →Water DisposalTank Spillover — Gooseneck Cascade Flow
Steady-state flow through gooseneck (inverted-U) spillover pipes between oilfield water-disposal tanks. Darcy–Weisbach + Colebrook–White with a weir-crest limit, a bisection level solver, settling and storage-to-alarm times, and a live tank schematic.
Open calculator →Pressure VesselsVessel Wall Thickness — ASME VIII (Approximate)
First-pass wall thickness for a pressure vessel on internal pressure: UG-27 shell and UG-32 head formulas worked in the corroded condition, allowable stress by material and design temperature, Table UW-12 joint efficiency, corrosion allowance, rounding up to a standard plate, and the MAWP that plate will hold. Preliminary sizing only — not a design calculation.
Open calculator →SeparatorsSeparator Sizing — Two/Three-Phase, Horizontal/Vertical
Size a new separator or rate an existing one. Gas capacity by the Souders-Brown K-factor and by design-droplet settling, liquid capacity by retention time, standard diameters with seam-to-seam length and L/D — then switch on the optional checks: inlet pipe momentum and erosional velocity, droplet-distribution carry-over, and mist extractor efficiency. Export the case to PDF and Excel. Runs in your browser.
Open calculator →More calculators coming soon.