Engineering Library
Calculators
Interactive sizing and rating calculators for process, mechanical, and electrical engineering. Each tool runs entirely in the browser and cites the standard or method it is based on.
- Ammonia Synloop Heat DutyHaber–Bosch loop reactor duty, compressor power, and specific energy.
- Bolted Flange Assembly TorqueASME PCC-1 target bolt load and torque from nut factor and gasket seating stress.
- Cable Tray Fill CalculatorNEC 392 cable tray fill percentage by tray size and cable mix.
- Catalyst Deactivation TrackerWABT deactivation rate and end-of-run prediction for fixed-bed catalyst cycles.
- Catalyst Loading CalculatorReactor bed volume and catalyst weight for dense or sock loading.
- Cathodic Protection CurrentNACE SP0169 impressed-current system sizing from coating resistance and current density.
- Centrifugal Compressor SizingPolytropic head and power from suction conditions, pressure ratio, and efficiency.
- Compressor Anti-Surge MarginSurge margin and trip-line check for centrifugal compressors per API 617 / 670.
- Compressor Performance (Polytropic)Polytropic head, GHP, BHP, and discharge temperature via the Schultz method.
- Control Valve Cv — ISA 75Required Cv for liquid, gas, and two-phase service per ISA–75.01.
- Control Valve Noise — IEC 60534Aerodynamic noise SPL at 1 m and OSHA 90 dBA check per IEC 60534-8-3.
- Cooling Tower Thermal RatingRange, approach, and tower characteristic KaV/L for a given duty.
- Cooling Water MakeupEvaporation, drift, blowdown, and total makeup water for a cooling tower per CTI ATC-105.
- Crude Cut YieldTBP cut yields, density by cut, and total volume recovery from an assay curve.
- Deaerator SizingPressurized deaerator vessel size, vent rate, and storage time for boiler feedwater service.
- Distillation Shortcut (FUG)Fenske–Underwood–Gilliland minimum stages, minimum reflux, and actual stages.
- Electrical Heater SizingkW duty from fluid mass flow, specific heat, and temperature rise with design margin.
- Electrical Load & Motor SizingFull-load amps, input kW, and kVA for a 3-phase motor per NEC Article 430.
- Electrical Load SummaryConnected, running, and demand loads for plant MCC sizing.
- Electrolyzer Stack Energy BalanceStack power, H2 output, efficiency, and thermal load for PEM or alkaline stacks.
- Emergency DepressuringAPI 521 vessel blowdown time via choked orifice against the 15-minute guideline.
- Emissions Estimation (AP-42)Annual NOx, CO, VOC, PM, SO2, and CO2 from fired equipment.
- Expansion Loop CalculatorPipe thermal growth and U-loop leg length per ASME B31.3 flexibility rules.
- FCC Process CalculatorFCC feed conversion, product yields, and total furnace duty.
- Fired Heater DutyProcess and fuel-side duty, efficiency, and firing rate for a fired heater.
- Fired Heater Stack DesignNatural-draft stack diameter and height per API 560 / Wimpress method.
- Fischer–Tropsch Mass BalanceSyngas conversion, selectivity, and product distribution for an FT reactor.
- Flare Header SizingAPI 521 header sizing from design release rate and Mach number limits.
- Gas Turbine Heat Rate CorrectionSite-condition correction of ISO output and heat rate per ISO 2314 / ISO 3977-2.
- Grounding Grid — IEEE 80Ground grid resistance, touch and step voltage screening per IEEE Std 80-2013.
- HCU Cycle Data ReviewHydroprocessing cycle health screen: WABT, H2 pressure, sulfur, and conversion.
- Heat Exchanger DutyDuty, LMTD, corrected LMTD, and required UA for a shell-and-tube exchanger.
- Heat Tracing DesignHeat loss per foot and tracer wattage for pipe freeze protection and process maintain.
- Heat Exchanger Fouling MonitorBack-calculated U and Rf from process data vs design clean/dirty values.
- Hydroprocessing Mass BalanceOverall mass balance closure, H2 consumption, and swell for a hydrotreater or hydrocracker.
- Hydrotreater WABT CalculatorCatalyst-weighted bed WABT and deactivation rate per API 932–A.
- Hydraulic GradientLine hydraulic gradient and available head along a process pipe run.
- Insulation ThicknessEconomic and personnel-protection insulation thickness per ASTM C680.
- Liquid Line SizingLine velocity, friction pressure drop, and recommended pipe size for liquid service.
- Methanation / Sabatier Reactor SizingAdiabatic fixed-bed reactor size, ΔT, and pressure drop for CO2 + 4H2 → CH4.
- Motor Efficiency EconomicsIE2 vs IE3/IE4 motor upgrade economics: payback, NPV, and CO2 avoided.
- Motor Feeder — NEC 430Branch ampacity, overload, SCGF, and disconnect sizing per NEC Article 430.
- Motor Starting Voltage DropBus voltage dip during across-the-line motor start from system impedances.
- MOV Actuator Torque / ThrustRising-stem and quarter-turn actuator sizing with packing and seat torque.
- Noise Prediction & AttenuationOSHA 29 CFR 1910.95 SPL at distance, combined sources, and exposure time.
- Orifice Plate SizingISO 5167 orifice bore for a given differential pressure and flow rate.
- Pipe Line SizingRecommended pipe size and velocity check for gas and liquid service.
- Pipe Stress Quick CheckASME B31.3 longitudinal stress and expansion flexibility quick screen.
- Piping Material Class ReferenceMaterial class lookup for service, temperature, and pressure class.
- Pressure Drop CalculatorDarcy–Weisbach frictional pressure drop with fittings and elevation.
- Pressure Test CalculatorHydrostatic and pneumatic test pressure per ASME B31.3 and Section VIII Div. 1.
- PSV / Relief Valve SizingAPI 520 effective orifice area for gas, liquid, and two-phase relief.
- Pump Hydraulic PowerHydraulic, shaft, and motor power from flow, head, and efficiencies.
- Pump NPSH AvailableNPSHa from suction elevation, line losses, and vapor pressure.
- Reactor Heat RemovalJacket or coil duty, area, and coolant flow for an exothermic CSTR with runaway check.
- Reactor TI Baseline AnalysisReactor skin thermocouple deviation versus baseline with yellow/red alerts.
- SAF Blending EconomicsSustainable aviation fuel blend cost, LCFS credit, and after-tax margin.
- Shell & Tube HX LMTD RatingCounter-current LMTD with Bowman Ft correction for 1-shell / 2N-tube TEMA E exchangers.
- Short Circuit & Arc Flash ScreeningBolted fault current and IEEE 1584 incident energy screening.
- Solar PV System SizingDC array size, year-1 and lifetime AC energy per NREL PVWatts methodology.
- Steam Line SizingSaturated-steam pipe sizing per Crane TP-410 with velocity and ΔP/100 ft limits.
- Steam Turbine PerformanceIsentropic and actual power from inlet and exhaust conditions with condition-line efficiency.
- Sulfiding Balance CalculatorCatalyst activation sulfur balance and DMDS/TNPS injection schedule.
- Tank Mixing / Agitator SizingImpeller power, tip speed, and blend time for a top-entry agitator.
- Tank Sizing & InspectionAPI 650/653 tank capacity and 1-foot-method minimum shell thickness.
- Transformer SizingThree-phase kVA sizing per IEEE C57.12.00 and NEC Article 450 with short-circuit estimate.
- Two-Phase Flow Pressure DropLockhart-Martinelli with Chisholm C correlation for two-phase ΔP and regime classification.
- UPS Battery SizingIEEE 485 battery Ah for a multi-period DC load profile with aging and temperature correction.
- Vessel Holdup & Residence TimeWorking volume, holdup time, and liquid level for horizontal and vertical vessels.
- Vessel Wall Thickness — ASME VIIIRequired shell and head thickness per ASME Section VIII Div 1.
- V-L Separator / KO Drum SizingAPI 12J / GPSA horizontal or vertical separator size using Souders–Brown k.
- Wind Turbine Power Curve / AEPAnnual energy production from a power curve and Weibull wind distribution per IEC 61400-12-1.
- Yield Recut CalculatorTBP-curve cut-point yield analysis for crude, vacuum, FCC, and hydrocracker feeds.
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Disclaimer. This material is provided for informational and educational purposes only and does not constitute professional engineering advice. Calculations, reference data, and methodologies are based on published standards and accepted engineering practice but are not a substitute for engineering judgment, site-specific analysis, or review by a licensed Professional Engineer. Inflection Point Engineering, LLC makes no warranties, express or implied, regarding the accuracy, completeness, or fitness for a particular purpose of any content presented here, and shall not be liable for any direct, indirect, incidental, or consequential damages arising from its use. Users assume all risk associated with applying this content to real-world design, operations, or decisions.
© 2026 Inflection Point Engineering, LLC. All rights reserved.