Browse our comprehensive collection of professional engineering calculators organized by discipline.
Essential calculations for pipeline design, hydraulics, and integrity
Comprehensive pipeline flow calculations including pressure drop, flow rate, and velocity analysis.
Optimize pipeline diameter based on flow rate, pressure drop, and economic considerations.
Calculate optimal pipe size for liquid service using Darcy-Weisbach and Swamee-Jain equations.
Analyze surge pressure from valve closure and pump trip using Joukowski equation and wave speed.
Calculate Darcy friction factor using Colebrook-White, Swamee-Jain, and Churchill with Moody diagram.
Calculate pressure profile and HGL along a liquid pipeline with elevation changes and slack flow detection.
Optimize multi-diameter pipeline segments to reduce material cost while maintaining hydraulic capacity.
Optimize pipe grade selection along a pipeline to reduce material cost and weight per ASME B31.4 and API 5L.
Calculate pressure drop, flow capacity, or required diameter using Darcy-Weisbach or Hazen-Williams equations.
Determine optimal pump station locations, spacing, horsepower, and costs for liquid pipelines with elevation profiles.
Analyze hydraulic effects of liquid injection or stripping at pipeline midpoints with mixed property calculations.
Size surge tanks, gas-charged accumulators, and relief valves for liquid pipeline transient protection per API 520/521.
Calculate density, viscosity (ASTM D341), bulk modulus, vapor pressure, and thermal expansion at operating conditions.
Calculate Maximum Allowable Operating Pressure per ASME B31.8 and B31.4 design codes.
Calculate circumferential stress in pipe walls from internal pressure using Barlow's formula.
Calculate operating stress as percentage of Specified Minimum Yield Strength.
Analyze stress in unsupported pipe spans and determine maximum allowable span lengths.
Highway and railroad pipeline crossing analysis per API RP 1102 with cyclic stress and weld fatigue checks.
Calculate buoyancy forces for floating objects and vessels in liquids.
Calculate buoyancy forces and anchoring requirements for submerged pipelines.
Calculate physical pipe volume and gas line pack with compressibility factor analysis per AGA-8.
Calculate cross-sectional flow area from pipe size and schedule.
Calculate pipe weight including contents, insulation, and coating for structural design.
Calculate average operating pressure in pipelines for flow and capacity analysis.
Size finger-type and vessel-type slug catchers for terrain, pigging, and ramp-up slug scenarios.
Corroded pipeline assessment per ASME B31G-2012 with safe pressure vs MAOP comparison
Calculate required pipe wall thickness per ASME B31.3 (process piping), B31.4 (liquid transportation), and B31.8 (gas...
Professional expansion loop calculator for piping flexibility analysis.
Professional HDD pullback force calculator per ASTM F1962.
Professional pipe support span calculator per ASME B31.1, B31.3, MSS SP-69 and AISC.
Professional pipeline crossing and casing design calculator per API 1102 and 49 CFR 192.
Professional pipeline longitudinal stress calculator per ASME B31.8 and B31.4.
Professional sand/erosion velocity calculator for pipeline design.
Professional pipeline seismic design calculator per ASCE 7 and ALA Guidelines.
Professional spring hanger calculator for variable and constant pipe supports.
Flow meters, custody transfer, gas quality analysis, and AGA compliance tools — View Complete Suite →
AGA 3 / ISO 5167 orifice meter flow calculation and sizing with Reader-Harris/Gallagher equation.
AGA 7 turbine meter sizing for gas and liquid custody transfer with velocity and rangeability analysis.
AGA 9 ultrasonic meter flow calculation with multipath diagnostics and SOS validation.
AGA 11 Coriolis mass flow and density measurement with zero stability analysis.
Rotary and diaphragm positive displacement meter sizing for distribution measurement.
Gas chromatograph composition analysis per GPA 2261 — heating value, SG, MW, Wobbe Index.
Spot and composite gas sampling per GPA 2166 — cylinder sizing, purge volume, JT cooling.
Upstream/downstream straight-run requirements and flow conditioner specifications per AGA standards.
RSS uncertainty budget for gas metering systems with pulsation error and custody transfer compliance.
Custody transfer measurement uncertainty, allocation, and imbalance analysis.
Prover volume corrections with CTPL, CTSP, and meter factor calculations.
Size displacement provers for meter proving — pipe, small volume, bidirectional.
Tank gauging volume calculations with temperature corrections per API MPMS.
Gross and net heating values, Wobbe Index, and gas interchangeability parameters.
Supercompressibility factor for gas measurement flow corrections per AGA 8.
ISO 5167-4 Venturi flow measurement with high pressure recovery for surge control.
NGL custody transfer meter station design with turbine, Coriolis, or PD configurations.
Natural gas treating, sweetening, dehydration, and processing calculations
Design amine sweetening systems for H2S and CO2 removal from natural gas streams.
Design TEG dehydration systems including contactor sizing and regeneration requirements.
Design molecular sieve dehydration systems for deep gas drying applications.
Design membrane systems for gas separation, CO2 removal, and nitrogen rejection.
Design sulfur recovery units for converting H2S to elemental sulfur.
Design stabilizer columns for condensate vapor pressure control and light ends removal.
Graphical distillation column design method for tray requirements and reflux ratio.
Calculate water dewpoint depression achievable with TEG dehydration systems.
Calculate water content in natural gas at saturation using empirical correlations.
Calculate fuel gas consumption and hydrocarbon losses from dehydration units.
Glycol loss estimate, flash tank sizing, and heat exchanger duty calculations.
Calculate blended gas properties including heating value, specific gravity, and composition.
Perform vapor-liquid equilibrium flash calculations for phase separation.
Size activated carbon beds for H₂S, mercury, BTEX, and VOC removal with breakthrough time estimation.
Size mechanical filters and activated carbon beds for amine solution particulate and contaminant removal.
Design SCOT tail gas treating units with hydrogenation reactor, quench, and MDEA absorber sizing.
Professional boil-off gas calculator for LNG and NGL cryogenic storage tanks.
Free gas dewatering calculator.
Check gas stream composition against pipeline tariff specifications per GPA 2261 and FERC quality standards.
Pinch analysis calculator for heat integration and energy optimization.
Professional vapor recovery unit sizing calculator for tank batteries and loading operations.
Professional Wobbe Index calculator for gas interchangeability.
Size and design process equipment for midstream facilities
Size two-phase and three-phase separators using API and GPSA methods.
Calculate pressure vessel dimensions, wall thickness, and weight per ASME Section VIII.
Size centrifugal pumps per API 610 including NPSH and efficiency calculations.
Rate shell and tube heat exchangers using LMTD and effectiveness-NTU methods.
Design refrigeration systems including propane and mixed refrigerant cycles.
Calculate turbo-expander performance including efficiency and power recovery.
Design steam and gas ejectors for vacuum systems and gas compression.
Calculate storage tank volumes for cylindrical, spherical, and horizontal vessels.
Calculate tank and pipe heating requirements using industry-standard methodology.
Design NGL custody transfer meter stations per Enterprise Products methodology.
Size control valves using Cv calculations per Industry standards.
Analyze distillation tray performance including flooding, weeping, and pressure drop.
Size cyclone separators for gas-solid separation including cut diameter, efficiency curves, and pressure drop.
Design CycloSep inline separators for compact gas-liquid separation with high efficiency.
Size filter-separator vessels for liquid and solid removal from natural gas streams.
Size fired heaters with radiant and convection sections per API 560, including tube design and efficiency.
Size fuel gas filtration systems for compressor and heater fuel conditioning.
Design separator internal components including inlet devices, mist eliminators, and vortex breakers.
Size kettle, thermosiphon, and forced-circulation reboilers with LMTD and Zuber CHF checks.
Size gas scrubbers for liquid knockout using Souders-Brown methodology and mist eliminator selection.
Compare horizontal, vertical, and spherical separator configurations for optimal selection.
Select optimal separator type based on operating conditions, space constraints, and separation requirements.
Design three-phase separators for simultaneous gas, oil, and water separation with retention time sizing.
Professional air cooler sizing calculator for fin-fan heat exchangers.
Professional API 650 tank wall thickness calculator for atmospheric storage tanks.
Professional cooling tower sizing calculator.
Professional electric motor sizing calculator for pumps, compressors, fans, and conveyors.
Professional flange leakage check calculator per ASME PCC-1, B16.5, and ASME VIII Appendix 2.
Professional gas turbine sizing calculator with altitude and temperature derating, heat rate estimation, fuel consump...
Professional tank blanketing gas calculator per API 2000.
Professional tank settling and foundation evaluation calculator per API 653 and API 650 Appendix B.
Predict control valve aerodynamic noise per IEC 60534-8-3 and ISA 75.17.
Sizing, performance, and analysis tools for centrifugal and reciprocating compressors
Size centrifugal and reciprocating compressors including stage selection.
Calculate compressor horsepower requirements using thermodynamic methods.
Compare centrifugal vs reciprocating compressors for your application.
Convert between ACFM, SCFM, ICFM, and MMSCFD at compressor conditions.
Calculate Z-factor, k-value, molecular weight, and density at compressor conditions.
Preliminary sizing for reciprocating compressors using industry-standard methodology.
Calculate stage compression ratios and optimize multi-stage configurations.
Predict discharge temperature from suction conditions and compression ratio.
Calculate horsepower requirements per MMSCFD for reciprocating compressors.
Calculate volumetric efficiency considering clearance, valve losses, and gas properties.
Calculate rod loads in tension and compression for cylinder loading analysis.
Generate pressure-volume diagrams for cylinder performance analysis.
Analyze acoustic pulsations and design pulsation dampeners per API 618.
Design pulsation dampener bottles with Helmholtz analysis, choke tubes, and orifice plates.
Analyze reciprocating compressor capacity control methods and power savings.
Calculate and convert between polytropic and isentropic efficiency.
Calculate polytropic head from pressure ratio, gas properties, and compressibility.
Predict discharge temperature from suction conditions and efficiency.
Calculate surge margin and operating point relative to surge line.
Analyze compressor performance curves and operating envelope.
Size tuyere nozzles for centrifugal compressor anti-surge systems.
Size concrete foundation blocks for compressor vibration isolation.
Calculate foundation-to-machine mass ratios for vibration control.
Size anchor bolts for compressor foundations per ACI 318.
Calculate allowable soil bearing pressure for foundation design.
Determine minimum foundation embedment depth for stability.
Calculate grout volume requirements for compressor foundation installation and leveling.
Determine natural frequency of compressor foundations to avoid resonance with operating speeds.
Calculate vibration amplitude at compressor foundation to verify acceptable displacement limits.
Calculate fuel gas consumption for gas engine and gas turbine compressor drivers.
Professional screw compressor sizing calculator for oil-flooded and dry types per API 619 and CAGI.
Professional vibration analysis calculator per ISO 10816, ISO 7919, API 618, API 617, and API 684.
Calculate air/fuel ratio, excess air, and combustion efficiency for natural gas engines.
Predict compressor flow rates using fan laws and performance curve corrections.
Calculate air-fuel ratio, equivalence ratio (phi), lambda, and excess air percentage for natural gas engines.
Size compressed air systems for compressor stations: air compressor capacity, receiver tank volume, and distribution piping.
Analyze reciprocating compressor rod loads, frame loading, cylinder pressures, and capacity at varying operating conditions.
Assess compressor station noise levels, sound propagation to property boundaries, and regulatory compliance.
Calculate engine horsepower derating for emissions compliance, altitude, and temperature on natural gas engines.
Predict exhaust gas temperatures for natural gas engines based on operating conditions, air-fuel ratio, and load.
Estimate silencer performance with octave-band DIL analysis for engine exhaust and inlet noise, with A-weighted results.
Pressure relief, flare systems, and safety analysis calculations
Size relief valves and PSVs per API 520/521 for gas, liquid, and two-phase service.
Calculate relief requirements for vessels exposed to external fire per API 521.
Size emergency relief systems for runaway chemical reactions and thermal events.
Design PSV discharge headers including backpressure and reaction force analysis.
Design flare and vent systems including sizing, dispersion, and radiation analysis.
Calculate thermal radiation from flares to determine safe separation distances.
Analyze flare header backpressure for multiple relief scenario combinations.
Design emergency depressurization systems for process vessels and piping.
Calculate pipeline and vessel blowdown times, rates, and temperature drops.
Calculate thrust loads, concrete support block sizing, and anchor bolts for blow-off valve venting.
Model fire, explosion, and toxic dispersion consequences for risk assessment.
Hazard and Operability study tools for systematic process hazard identification.
Size atmospheric tank vents for thermal breathing, blow-by gas, and fire cases per API 2000.
Layer of Protection Analysis for determining Safety Integrity Level requirements.
Calculate LEL/UEL limits, stoichiometric air requirements, and combustion products for gas mixtures.
Professional BLEVE fireball calculator for consequence analysis.
Professional ESD valve sizing calculator for emergency shutdown systems.
Professional fire water demand calculator for deluge and equipment cooling systems.
Professional fugitive emissions calculator using EPA average emission factors for oil and gas equipment.
Professional GHG emissions estimator for midstream oil and gas operations.
Professional jet fire radiation calculator for consequence analysis.
Calculate methane and VOC emissions from pneumatic controllers and pumps at gas facilities.
Professional pool fire modeling calculator for consequence analysis.
Calculate PSV inlet piping pressure loss per API 520 Part II.
Professional SIL verification calculator for Safety Instrumented Functions.
Professional stack height and atmospheric dispersion calculator.
Operational calculations for pipeline maintenance and integrity
Calculate pipeline pig travel speed and estimated arrival times for pigging operations.
Determine safe operating pressure for hot tapping and welding on in-service pipelines.
Calculate minimum flow requirements for hot tapping, welding, and coating operations.
Basic drying calculations for equipment and systems.
Calculate methanol and MEG requirements for pipeline dewatering and drying.
Calculate nitrogen requirements for pneumatic pressure testing of pipelines.
Calculate corrosion rates, remaining life, and fitness-for-service assessment.
Calculate tape wrap coating material requirements for pipeline corrosion protection.
Calculate odorant injection rates to meet regulatory odorization requirements.
Calibrate YZ bypass odorizers for natural gas odorization systems.
Calculate gas loss during drip pot blowing operations for emissions reporting.
Professional CO2 corrosion rate calculator using de Waard-Milliams model (1975/1991/1993).
Professional CP anode sizing calculator for buried pipeline cathodic protection.
Professional CP rectifier sizing calculator for impressed current cathodic protection systems per NACE SP0169.
Professional CP survey analysis calculator for cathodic protection data.
Professional leak detection sensitivity calculator for pipeline SCADA systems per API 1130 and API 1160.
Professional welding preheat calculator for pipeline welding per API 1104, AWS D1.1, ASME B31.3, and EN 1011-2.
Fundamental thermodynamic calculations and property predictions
Calculate gas density using real gas equations of state (AGA-8, BWRS, Peng-Robinson).
Solve ideal gas law equations for pressure, volume, temperature, or moles.
Calculate gas velocity in pipelines from flow rate, pressure, and temperature.
Calculate Joule-Thomson temperature drop across pressure reduction valves and orifices.
Calculate vapor pressure of hydrocarbons using Antoine and other correlations.
Generate phase envelopes and determine cricondentherm, cricondenbar points.
Predict gas hydrate formation conditions using K-factor and statistical methods.
Calculate hydrate formation temperature at specified pressure and gas composition.
Calculate heat transfer coefficients, U-values, and thermal resistance.
Calculate thermal expansion and contraction of materials and piping systems.
Convert between API gravity, specific gravity, and density for crude oil and liquids.
Calculate atmospheric pressure at different elevations for equipment design.
Gas compressibility factor using DAK and Hall-Yarborough correlations with sour gas correction
Two-phase flow pressure drop calculations for oil and gas systems
Two-phase flow correlation for horizontal and inclined pipelines (oil-gas systems).
Vertical multiphase flow correlation widely used for oil well tubing calculations.
Mechanistic two-phase flow model for horizontal and slightly inclined pipelines.
Two-phase vertical flow correlation modified from Hagedorn-Brown for wet gas.
Metric conversion, temperature conversion, and engineering unit calculators
Convert between gas volume units (SCF, MCF, BCF) and energy units (BTU, therms).
Convert natural gas volume to energy content based on heating value.
Convert between Fahrenheit, Celsius, Kelvin, and Rankine temperature scales.
Convert between BTU, kWh, joules, calories, and other energy units.
Convert between metric and imperial units for pressure, temperature, flow, and length.
Convert H2S concentration between ppm, mol%, mg/m³, and grains/100 SCF.
Interpolate values between data points for property estimation.
Extrapolate values beyond known data range using linear trends.
Convert between horsepower and torque for rotating equipment.
Calculate gas flow rate through orifice meters per AGA-3 and ISO 5167.
ISO 5167-4 venturi meter sizing with low permanent pressure loss.
Calculate pressure base correction factors for gas measurement.
K-factors for elbows, valves, tees, and straight pipe. Crane TP-410, Hooper 2-K, Darby 3-K methods.
Size district regulators for intermediate pressure reduction in gas distribution systems.
Select proper EFV size for gas service lines per 49 CFR 192.383.
Size instrument air systems for gas plants and compressor stations per ISA 7.0.01.
Size pressure regulators for gas distribution stations per AGA guidelines and 49 CFR 192.
Size gas service lines for residential and commercial buildings using Weymouth and Spitzglass formulas per AGA, 49 CF...
Design town border stations for gas distribution entry points.
Material selection, mechanical properties, and design specifications
Select appropriate materials based on service conditions, temperature, and corrosivity.
ANSI flange pressure-temperature ratings for various materials and classes.
Analyze weld test coupons and calculate tensile strength and elongation.
Calculate welding rod and filler metal requirements for pipeline construction.
Determine flange stud bolt size, quantity, and torque requirements.
Calculate required thickness for skillet blind flanges and spectacle blinds.
Size drain orifices for vessels to prevent blockage and ensure adequate drainage.
Calculate concrete volume for footings, pads, and pipeline supports.
Calculate water volume for hydrostatic testing and system filling.
Calculate CNG, LNG, and liquid transport truck capacities and weights.
Economic evaluation and process optimization calculations
Calculate Net Present Value for project economic evaluation and decision making.
Calculate simple and discounted payback periods and return on investment.
Combined Net Present Value and Internal Rate of Return calculator for comprehensive project evaluation.
Calculate pipeline transportation tariff rates using FERC cost-of-service methodology with WACC analysis.
Estimate annual operating costs for facilities including labor, utilities, and maintenance.
Compare operating costs for natural gas and diesel engines for compressors and generators.
Calculate thermal efficiency, recovery rates, and process performance metrics.
Optimize process operating conditions for maximum efficiency and throughput.
Calculate leak rates and gas loss through pipeline ruptures and holes.
Calculate blowdown rates, purge times, and gas consumption for operations.
Advanced calculations for NGL recovery, fractionation, and cryogenic processing
Calculate turboexpander performance, efficiency, power recovery, and temperature drop for cryogenic NGL recovery.
Calculate lean oil circulation rates, NGL recovery efficiency, and absorber design for oil absorption plants.
Size fractionation columns for deethanizer, depropanizer, debutanizer, and butane splitter applications.
Calculate nitrogen removal efficiency, methane recovery, and refrigeration requirements for cryogenic NRU.
Calculate methanol and glycol injection rates for hydrate prevention in gas processing and pipelines.
Calculate split-vapor process design and demethanizer reflux for enhanced ethane recovery in cryogenic plants.
Calculate mercury removal bed sizing, adsorbent capacity, and regeneration cycles for gas processing protection.
Optimize ethane and propane recovery modes, calculate economics, and compare operating scenarios.
Calculate packed tower sizing, pressure drop, and packing selection for absorption and distillation applications.
Calculate Joule-Thomson temperature drop across valves and assess hydrate formation risk in gas expansion.
Design silica gel dehydration systems including bed sizing, regeneration cycles, and dewpoint specifications.
Cryogenic NGL recovery, refrigeration systems, and lean oil absorption plant equipment
Design cryogenic ethane recovery with GSP, CRR, and ISS process configurations and demethanizer sizing.
Calculate C₃+ NGL recovery with turboexpander, JT, or refrigeration processes and ethane rejection.
Size multi-stage cascaded refrigeration systems with optimal interstage temperatures and COP analysis.
Size gas chiller heat exchangers for refrigeration service with LMTD, fouling, and area calculation.
Design flash gas economizers for refrigeration loops with power savings and COP improvement analysis.
Size rich-oil demethanizer columns for lean oil absorption plants with FUG shortcut method.
Calculate hot rich-oil flash tank sizing with Rachford-Rice VLE and vapor-liquid separation.
Size oil purification stills for NGL stripping from lean oil with optional steam stripping.
Calculate boiling and freezing points for pure components and mixtures using Clausius-Clapeyron.
Column sizing for deethanizer, depropanizer, debutanizer, and butane splitter applications
Size deethanizer columns with FUG shortcut method, 6-component feed, and Wilson K-values.
Size depropanizer columns for C₃/iC₄ separation with HD-5 propane product specification.
Size debutanizer columns for nC₄/iC₅ separation at typical 100 psig operating pressure.
Size deisobutanizer for close-boiling iC₄/nC₄ separation requiring 60-120 tray counts.
Area classification, emissions calculations, equipment spacing, and regulatory compliance
Calculate barrel, kicker, and valve dimensions for pig traps per industry standards.
Calculate minimum distances between buildings, tanks, and vents per DOT CFR 192 requirements.
Calculate Division 1 and Division 2 boundary distances from release sources per API RP 500.
Calculate maximum test pressure based on pipe size, wall thickness, and SMYS per ASME B31.8.
Determine reinforcement pad requirements for branch connections per ASME B31.8 Section 831.4.
Calculate Ldn at property line from compressor station sources for FERC 55 dBA compliance.
Calculate annual emissions (NOx, CO, VOC) from engines and turbines for air permitting.
Determine if facility emissions exceed Title V or PSD major source thresholds.
Cable sizing per NEC (NFPA 70) — ampacity tables, voltage drop, and derating calculations.
PID controller tuning via Ziegler-Nichols, Cohen-Coon, IMC, and Lambda methods.
Structural load calculations for pipe racks per ASCE 7 and PIP STC01015.
Calculate pressure drop using Darcy-Weisbach with iterative Colebrook-White friction factor.