A process simulator that runs in your browser: steady-state, pressure-driven and dynamic flowsheets, rigorous thermodynamics, and an AI copilot that builds and explains them. There is nothing to install.

Does the AI calculate the results?

No. The copilot proposes a flowsheet or a change and explains it; the deterministic solver computes every temperature, duty and composition you see. A flowsheet from the copilot that does not validate is not applied.

Will it feel familiar if I have used Aspen Plus or HYSYS?

That is the intent. The workbench has a ribbon, an All Items tree, a form for each block and the three run modes — steady state, pressure driven and dynamics — so the habits carry over.

Can it open my Aspen or HYSYS cases?

Aspen Plus .bkp and .apw, HYSYS .hsc and DWSIM files import with deterministic parsing and a report of what was recovered. A HYSYS .hsc import is partial — unit names and types, not connectivity — and the report says so.

Which thermodynamic models are included?

Peng-Robinson and SRK (including Gᴱ mixing rules), NRTL, UNIQUAC, UNIFAC, PC-SAFT, CPA, GERG-2008, electrolyte NRTL, Pitzer and the IAPWS steam tables — more than 30 property packages in all.

Yes. The Python SDK (pip install flowsim-sdk) creates, runs and reads simulations, and its results are the same objects the canvas shows.

How much does it cost?

It is free to start, with no credit card. Paid plans add higher limits and team features; the pricing page has the details.

A process simulator that runs in your browser: steady-state, pressure-driven and dynamic flowsheets, rigorous thermodynamics, and an AI copilot that builds and explains them. There is nothing to install.

Does the AI calculate the results?

No. The copilot proposes a flowsheet or a change and explains it; the deterministic solver computes every temperature, duty and composition you see. A flowsheet from the copilot that does not validate is not applied.

Will it feel familiar if I have used Aspen Plus or HYSYS?

That is the intent. The workbench has a ribbon, an All Items tree, a form for each block and the three run modes — steady state, pressure driven and dynamics — so the habits carry over.

Can it open my Aspen or HYSYS cases?

Aspen Plus .bkp and .apw, HYSYS .hsc and DWSIM files import with deterministic parsing and a report of what was recovered. A HYSYS .hsc import is partial — unit names and types, not connectivity — and the report says so.

Which thermodynamic models are included?

Peng-Robinson and SRK (including Gᴱ mixing rules), NRTL, UNIQUAC, UNIFAC, PC-SAFT, CPA, GERG-2008, electrolyte NRTL, Pitzer and the IAPWS steam tables — more than 30 property packages in all.

Yes. The Python SDK (pip install flowsim-sdk) creates, runs and reads simulations, and its results are the same objects the canvas shows.

How much does it cost?

It is free to start, with no credit card. Paid plans add higher limits and team features; the pricing page has the details.

Engineering analysis toolkit

Every calculator you keep in a spreadsheet, built in

78 standalone process-engineering calculators live next to your flowsheet — relief and flare sizing, psychrometrics, pumps and compressors, gas-pipeline flow, cooling towers and fired heaters. Each on a cited method. No install, no add-on license.

Open the workspace See the math

Reach for the right tool without leaving the browser

Open the Engineering Analysis panel from the workspace and pick a calculator. Property-dependent tools share the solver's property packages, so your hand checks and your full runs never disagree.

Separation & columns

18 tools

Short-cut and screening sizing for columns, drums, reboilers and batch operations — the back-of-envelope checks you run before committing a rigorous MESH solve.

Shortcut column

Fenske-Underwood-Gilliland minimum stages / reflux

Separator sizing (KO drum)

Souders-Brown / GPSA droplet settling

Batch recipe scheduling

Equipment occupancy, cycle time, bottleneck, campaign Gantt

mRNA / LNP / oligonucleotide

IVT kinetics with PPi inhibition, N/P formulation, stepwise coupling yield

Freeze drying (lyophilization)

Pikal primary drying, collapse margin, QbD design space

Viral clearance

ICH Q5A: low-pH inactivation kinetics, Vmax virus filtration, LRV budget

Protein A capture

Bohart-Adams breakthrough, dynamic binding capacity, cycle design

TFF / UF-DF (biologics)

Film-theory polarization + virial osmotic flux; diafiltration

Fed-batch cell culture

Multi-substrate Monod with byproduct inhibition, Pirt maintenance, Luedeking-Piret titre

Adherent / microcarrier expansion

Contact-inhibited logistic growth, attachment kinetics, population doublings

Gradient elution (ion exchange)

Steric mass-action isotherm on the rigorous packed bed

Decanter / settler sizing

Schiller-Naumann droplet settling + interface area

Reboiler boiling rating

Mostinski film coefficient + Zuber CHF margin

Batch distillation

differential Rayleigh distillation

Batch reactor

constant-volume Arrhenius kinetics + adiabatic ΔT

Packed-column flood

GPDC / Kister-Gill flood-gradient correlation

Peak resolution

Purnell resolution Rs + implied cut purity

PSA cycle

Skarstrom swing working capacity, light-product purity

Fluid & gas properties

16 tools

Point-property and gas-quality calculators off the same validated property packages the solver uses — psychrometrics, combustion, fuel-quality and petroleum-assay work.

Speed of sound

isentropic dP/dρ from the property package

Critical / choke flow

isentropic nozzle critical-pressure ratio

Joule-Thomson

isenthalpic μ_JT + inversion from package enthalpy

Gas viscosity & conductivity

Chung / kinetic-theory correlations

Liquid transport (σ, λ, μ)

surface tension, conductivity, viscosity

Vapor pressure / RVP

Reid vapor pressure from the package

Combustion / Wobbe

ISO 6976 calorific value + Wobbe index

Psychrometrics (humid air)

ASHRAE moist-air state (the HYSYS 'Air' utility)

Evaporative cooler

adiabatic saturation air-washer along the wet-bulb line

Air mixing (AHU mixing box)

adiabatic mass + enthalpy balance, fog check

Steam tables

IAPWS-95 water/steam property lookup

Acid dew point

Verhoff-Banchero sulfuric-acid flue-gas dew point

Flash point

Le Chatelier / Liaw closed-cup mixture flash point

Hydrates & water content

hydrate formation T/P + saturated water content

Petroleum assay

TBP cut / pseudo-component characterization

Cetane index

ASTM D976 calculated cetane index

Piping & rotating equipment

12 tools

Line sizing, metering, pumps and compressors — the daily hydraulics and machinery checks, each on a published correlation.

Multiphase pipe

Beggs-Brill two-phase pressure drop / holdup

Line sizing

API RP 14E erosional velocity + line ΔP

Orifice meter

ISO 5167 orifice-plate flow metering

Control valve (Cv)

ISA/IEC valve sizing, choked-flow aware

NPSH

available-NPSH pump cavitation margin

Pump / system curve

head-curve ∩ system-curve operating point

Pump affinity laws

speed / impeller scaling (Q∝N, H∝N², P∝N³)

Compressor sizing

polytropic / isentropic head + power

Multistage compression

N-stage intercooled train + per-stage duty

Thermowell

ASME PTC 19.3 shedding-frequency-ratio screen

Gas pipeline

Weymouth / Panhandle A-B / AGA transmission flow

Well IPR

Vogel inflow performance / deliverability

Relief, flare & depressuring

14 tools

Pressure-relief and flare-system sizing to the API/DIERS standards — from a single PRV to a converging flare-header network.

Relief / flare sizing

API 520 vapor / liquid PRV orifice sizing

PRV sizing (correction factors)

API 520 Part I Kd/Kb/Kc/Kv/Kw + valve-type check

Two-phase relief

DIERS Leung ω-method flashing relief

Relief reaction force

API 520 Part II open-discharge reaction force

Thermal relief

API 521 blocked-in thermal-expansion relief

Fire-case relief

API 521 external-fire wetted-area heat input

Tube rupture

API 521 two-thirds exemption + guillotine discharge

Relief study (governing case)

API 521 governing-case ranking + single-cause combination

Flare radiation

API 521 point-source radiant flux + exclusion radius

Flare network

multi-branch converging relief-header back-pressure solver

Depressuring / blowdown

API 521 choked-orifice blowdown + auto-refrigeration

Relief inlet 3%

API 520 §7.3.2 PRV inlet-line chatter check

Dust explosion vent

NFPA 68 deflagration venting + K_St cubic law

Hopper / silo discharge

Beverloo flow rate + Jenike arching diameter

Storage & emissions

1 tools

Tank breathing and venting to the storage standards.

Tank venting

API 2000 in/out-breathing + working/breathing losses

Energy, heat & data

17 tools

Heat-transfer rating, heat integration, and the plant-data tools — cooling towers, fired heaters, pinch analysis and data reconciliation.

HX rating (ε-NTU)

effectiveness-NTU off-design exchanger rating

Fired heater (radiant)

Lobo-Evans radiant-box bridgewall-temperature balance

Air cooler (fin-fan ACHE)

Briggs-Young finned-tube air-side + ε-NTU rating

Plate HX (gasketed)

Kumar chevron-plate correlations + counter-current ε-NTU

Desuperheater (spray water)

IAPWS-95 steam-table mixing energy balance

Condensate flash tank

flash-steam lever rule + Souders-Brown vessel sizing

Insulation heat loss

ASTM C680 radial conduction + radiation/convection film

Agitator / mixing

power-number law + Chilton-Drew-Jebens jacket coefficient

Batch heat-up / cool-down

Kern batch-thermal closed forms (jacket / coil)

Refrigeration / heat pump

vapour-compression cycle COP vs the Carnot limit

Multi-effect evaporator

equal-area ΔT distribution + steam economy

Cooling tower

Merkel KaV/L demand + fill-characteristic adequacy

Heat integration

Linnhoff pinch composite curves + energy targets

Data reconciliation

least-squares mass-balance closure

Anomaly detection

PCA / autoencoder residual scoring

Breakthrough (bed PDE)

packed-bed adsorption breakthrough curve

State-space ID / MPC

ERA realization + state-space MPC move

Frequently asked questions

What engineering calculators are built into MaximaLabs?

MaximaLabs ships 78 standalone analysis tools alongside the flowsheet simulator: relief-valve and flare-network sizing to API 520/521 and DIERS, psychrometrics, combustion and Wobbe index, pump and compressor curves, gas-pipeline flow (Weymouth), cooling-tower (Merkel) and fired-heater rating, pinch heat integration, and more.

Do the calculators use the same physics as the simulator?

Yes. Property-dependent tools (psychrometrics, vapor pressure, combustion, flash point) call the same validated property packages the flowsheet solver uses, so a hand check and a full run agree. Every tool is a cited published method or industry standard.

Are these relief and flare calculators standards-compliant?

The relief and flare tools implement the API 520/521, API 2000 and DIERS ω-method procedures directly, including a multi-branch converging flare-header back-pressure network solver. They are screening-grade engineering tools, not a substitute for a stamped relief study.

One workspace, the whole engineering desk

The same browser tab that runs your rigorous flowsheet runs 78 screening calculators, shows you the governing equations, and connects to live plant data. No per-tool license, no context switch.

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