Multicalci exposes 9 process engineering calculation engines as MCP tools, so AI assistants call real standards-referenced code instead of estimating the arithmetic. All results are computed with iterative numerical methods (Newton-Raphson, quadrature) rather than approximations.
Tools include: pipe pressure drop (Darcy-Weisbach/Colebrook-White), control valve sizing for liquid and gas (IEC 60534-2-1), orifice flow (ISO 5167-2, Reader-Harris/Gallagher), gas Z-factor (Peng-Robinson), NPSH availa
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control_valve_size_gasInspectSize a control valve for gas or vapour service per IEC 60534-2-1 using the mass-flow form. Returns required Kv and Cv, pressure-drop ratio x, expansion factor Y and a choked-flow check against Fgamma*xT. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| xT | No | Pressure differential ratio factor xT (globe 0.72, ball 0.15) | |
| mass_flow_kgh | Yes | Gas mass flow rate, kg/h | |
| molecular_weight | No | Gas molecular weight, g/mol | |
| compressibility_Z | No | Compressibility factor Z at inlet | |
| inlet_pressure_bara | Yes | Upstream pressure P1, bar absolute | |
| inlet_temperature_k | No | Inlet temperature, K | |
| specific_heat_ratio | No | Ratio of specific heats gamma (Cp/Cv) | |
| outlet_pressure_bara | Yes | Downstream pressure P2, bar absolute |
control_valve_size_liquidInspectSize a control valve for liquid service per IEC 60534-2-1 / ISA 75.01. Returns required Kv and Cv, choked-flow check (FF, dP limit) and cavitation index sigma with an assessment. Pressures in bar absolute. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| FL | No | Liquid pressure recovery factor (globe 0.9, ball 0.6, butterfly 0.7) | |
| flow_m3h | Yes | Liquid flow rate, m3/h | |
| density_kgm3 | No | Liquid density at flowing temperature, kg/m3 | |
| inlet_pressure_bara | Yes | Upstream pressure P1, bar absolute | |
| outlet_pressure_bara | Yes | Downstream pressure P2, bar absolute | |
| vapour_pressure_bara | No | Vapour pressure at flowing temperature, bar a | |
| critical_pressure_bara | No | Thermodynamic critical pressure, bar a |
gas_z_factor_prInspectReal-gas compressibility factor Z, molar volume, density and fugacity coefficient from the Peng-Robinson equation of state. When two roots exist the stable phase is chosen by minimum fugacity, not by root count. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| pressure_bara | Yes | Pressure, bar absolute | |
| temperature_c | Yes | Temperature, degC | |
| acentric_factor | Yes | Acentric factor omega | |
| molecular_weight | No | Molecular weight, g/mol | |
| critical_pressure_bara | Yes | Critical pressure Pc, bar absolute | |
| critical_temperature_k | Yes | Critical temperature Tc, K |
npsh_availableInspectNet Positive Suction Head available for a centrifugal pump, broken down by component. Optionally compares against NPSHr and reports the margin with a Hydraulic Institute style assessment. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| density_kgm3 | No | Liquid density, kg/m3 | |
| static_head_m | Yes | Liquid level above pump centreline, m (negative for lift) | |
| friction_loss_m | No | Suction line friction and fitting losses, m | |
| npsh_required_m | No | Pump NPSHr from the curve, m (optional) | |
| vapour_pressure_bara | No | Vapour pressure at pumping temperature, bar a | |
| suction_pressure_bara | No | Absolute pressure on suction vessel surface, bar a |
orifice_flow_iso5167InspectCalculate mass flow through an orifice plate per ISO 5167-2 using the Reader-Harris/Gallagher discharge coefficient equation, solved iteratively against pipe Reynolds number. Supports corner, flange and D&D/2 taps, gas expansibility and permanent pressure loss. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| tap_type | No | Pressure tap arrangement | flange |
| pipe_id_mm | Yes | Pipe internal diameter D, mm | |
| fluid_state | No | Fluid state; gas/steam applies expansibility | liquid |
| density_kgm3 | No | Upstream fluid density, kg/m3 | |
| viscosity_cp | No | Dynamic viscosity, cP | |
| orifice_bore_mm | Yes | Orifice bore diameter d at flowing temperature, mm | |
| isentropic_exponent | No | Isentropic exponent kappa (gas/steam only) | |
| upstream_pressure_bara | No | Upstream static pressure, bar a (gas/steam only) | |
| differential_pressure_pa | Yes | Measured differential pressure, Pa | |
| downstream_pressure_bara | No | Downstream static pressure, bar a (gas/steam only) |
pipe_pressure_dropInspectCalculate friction pressure drop in a pipe using Darcy-Weisbach with the Colebrook-White friction factor. Handles laminar and turbulent flow, fitting losses by the K-method, and elevation change. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| flow_m3h | Yes | Volumetric flow rate, m3/h | |
| length_m | Yes | Straight pipe length, m | |
| diameter_mm | Yes | Pipe internal diameter, mm | |
| density_kgm3 | No | Fluid density, kg/m3 | |
| roughness_mm | No | Absolute pipe roughness, mm (CS 0.045, SS 0.015) | |
| viscosity_cp | No | Dynamic viscosity, cP | |
| fitting_k_total | No | Sum of fitting K factors | |
| elevation_change_m | No | Rise from inlet to outlet, m (negative if falling) |
pump_powerInspectPump hydraulic, shaft (brake) and motor input power from duty point, with the next standard IEC motor frame size at a 15 percent margin. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| head_m | Yes | Total differential head, m | |
| flow_m3h | Yes | Flow rate, m3/h | |
| density_kgm3 | No | Liquid density, kg/m3 | |
| pump_efficiency | No | Pump efficiency, percent | |
| motor_efficiency | No | Motor efficiency, percent |
steam_saturation_if97InspectWater and steam saturation properties from the IAPWS-IF97 Region 4 equation. Give either temperature_c to get saturation pressure, or pressure_bara to get saturation temperature. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| pressure_bara | No | Saturation pressure, bar absolute (0.0061 to 220.64) | |
| temperature_c | No | Saturation temperature, degC (0.01 to 373.946) |
tank_volumeInspectTotal and partial-fill volume of a cylindrical tank or pressure vessel with flat, hemispherical, 2:1 ellipsoidal, torispherical (ASME F&D) or conical heads. Horizontal or vertical. The torispherical head is integrated over the exact crown and knuckle profile rather than the usual approximation. Powered by multicalci.com.
| Name | Required | Description | Default |
|---|---|---|---|
| head_type | No | Head type on both ends | ellipsoidal_2_1 |
| diameter_m | Yes | Inside shell diameter, m | |
| orientation | No | Vessel orientation | vertical |
| density_kgm3 | No | Liquid density for mass output, kg/m3 (optional) | |
| cone_height_m | No | Conical head height, m (default = D/2) | |
| crown_radius_m | No | Torispherical crown radius L, m (ASME F&D default = D) | |
| liquid_level_m | No | Liquid level from the lowest inside point, m (optional) | |
| knuckle_radius_m | No | Torispherical knuckle radius r, m (ASME F&D default = 0.06 D) | |
| straight_length_m | Yes | Straight shell length, tangent to tangent, m |
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