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.
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.
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 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.
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.
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.
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.
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.
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.
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.
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.
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.
Related Fundamentals: Compressor Station Layout · ESD System Design · Electrical Area Classification · Air Permitting