Tools
Practical calculators and utilities for engineering teams
25 tools found
Separator Preliminary Sizing
Process Engineering · Oil & Gas
Screening calculation for preliminary vessel dimensions and operating checks.
Project information
Service
Operating conditions
Gas flow and properties
Density priority: manual ρ wins; else ρ from P/T/Z/MW. >3% mismatch warns.
If both standard flow and actual flow are entered, they are cross-checked (>5% warns).
Standards reference (API 12J / GPSA Section 7 — Separation Equipment): conventional separator with mist extractor ≈ 150 µm; bulk knock-out (KOD) without fine mist removal ≈ 250–500 µm; scrubber upstream of rotating equipment ≤ 100 µm. Mist extractor removes droplets down to ~10 µm. Verify against project criteria / vendor.
Informational only — does not change the calculation (edit K directly).
Liquid data
Design constraints
Informational only — does not change the calculation (edit K directly).
Typical K screening defaults (not project criteria)
| horizontal | no mist | 0.2 ft/s | 0.15–0.25 |
| horizontal | mist | 0.32 ft/s | 0.25–0.40 |
| vertical | no mist | 0.15 ft/s | 0.10–0.20 |
| vertical | mist | 0.27 ft/s | 0.20–0.35 |
Recommended preliminary separator
Internal diameter (in)
54.0
Tangent-to-tangent length (ft)
19.0
L/D
4.22
Gross vessel volume (ft³)
302.2
Gas disengagement area (ft²)
7.95
Gas velocity (ft/s)
1.706
% of allowable: 82.6%
Allowable gas velocity (ft/s)
2.066
Required liquid volume (ft³)
139.0
Available liquid volume: 151.1 ft³
Calculated retention time (min)
7.75
3D preview
Parametric preview from sizing results — not a fabrication model.
Checks
Warnings
- L-L settling: Not calculated — verify Stokes/project criteria / vendor.
- This tool does not size inlet devices, mist extractors, level controls, relief devices, nozzles, internals, wall thickness, supports, or ASME mechanical design.
Preliminary screening tool only. Results must be verified against the applicable project design basis, fluid characterization, process simulation, applicable codes and standards, and vendor/manufacturer requirements. This tool is not suitable for final mechanical, safety, relief, internals, nozzle, control valve, or guaranteed separation design.
Souders–Brown screening consistent with common oil & gas practice; not a certified API 12J / GPSA compliance calculator.
Calculation details
Method: Souders–Brown gas-capacity screening + liquid retention holdup. Preliminary, deterministic. US Customary units (engine works in canonical SI).
V_max = K · √((ρL − ρg)/ρg) = 0.6298 m/s (ρL=768.886 kg/m³, ρg=18.0076 kg/m³)
ρg source: calc from P/T/Z/MW (calc=18.0076 kg/m³)
Method (horizontal): vapor area A_vap = A_total − A_liquid_segment (fill=50% of D); gas capacity = A_vap · V_max
Horizontal gas capacity uses vapor cross-section only (length-independent); length is set by liquid holdup.
Liquid holdup V_req = Q_liq · t_ret · surge = 3.936 m³; L_tt = V_req / A_liquid_segment
Three-phase holdups: V_cond = 1.905 m³, V_water = 2.032 m³ (separate)
Rounded: D = 1.372 m, L_tt = 5.791 m (margin 5% applied to holdup length)
Final: A_diseng = 0.7388 m², V_gas = 0.5199 m/s = 82.6% of allowable
Liquid retention: required 3.936 m³ vs available 4.278 m³ → 7.75 min
Candidate scan (first 5): D=0.61m, D=0.76m, D=0.91m, D=1.07m, D=1.22m
Horizontal and vertical use distinct area/volume equations (vapor segment vs full cross-section). Three-phase holdups are computed separately; liquid–liquid settling is not resolved here.
Illustrative only — verify against project criteria.
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Estimate terminal block count, DIN rail utilization, and cable gland schedule for junction box sizing.
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Instrument Cable Voltage Drop
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Voltage Drop Calculator
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Estimate full load amps for AC motors based on HP/kW and voltage.
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Restriction Orifice Sizing
Preliminary restriction orifice (RO) sizing for gas and single-phase liquid services using differential-pressure & compressible-flow equations. Critical/subcritical detection via critical pressure ratio, multi-stage equal-ratio distribution, cavitation/flashing screening. Steam and two-phase flashing are not certified methods here. SI & US Customary.
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Orifice Plate Sizing Calculator
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Control Valve Cv Calculator
Calculate required valve flow coefficient (Cv) for liquid and gas services using ISA/IEC 60534-2-1 equations.
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Control Valve Sizing Calculator
Preliminary control-valve sizing for liquid, gas and steam per IEC 60534-2-1 / ISA-75.01.01. Required Cv/Kv, recommended nominal size, choked/cavitation/flashing checks, multi-case (min/normal/max), lead & printable report. Preliminary — not for final procurement or safety-critical design.
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Pipe Sizing Tool
Verifies line hydraulics (liquid/gas/multiphase): velocity, frictional ΔP/L and API 14E erosion via Darcy–Weisbach/Colebrook and Beggs & Brill. Editable acceptance criteria and batch line sizing, with auto-size and exports. Preliminary — not a certified calculation.
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Convert between PSI, bar, kPa, MPa, kg/cm², and inH₂O.
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Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine.
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Gas Flow Unit Converter
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Flare Radiation Calculation
Preliminary flare thermal-radiation calculation per API 521 (simple point-source method): heat release, flame length, wind-relative flame geometry, atmospheric transmissivity, optional solar baseline, exclusion radii, receiver flux, and required stack height. Not a substitute for Brzustowski-Sommer, solid-flame, or CFD siting.
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Separator Preliminary Sizing
Preliminary screening of horizontal/vertical two-phase and three-phase oil & gas separators (Souders–Brown gas capacity + liquid retention holdup). ID, L/H, L/D, gas velocity vs allowable, retention checks, bilingual, unit systems, traceable calculation details. Screening only — not certified API 12J / GPSA or mechanical design.
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Pressure Safety Valve (PSV) Sizing
Preliminary PSV sizing per API RP 520 Part I for gas/vapor, liquid and steam services. Multi-case relief scenarios, API 526 orifice selection (D-T), choked-flow detection and oversize-margin check. Lead-gated PDF datasheet for procurement. Preliminary — not for final procurement or safety-critical design.
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Commissioning Punch List
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FAT Checklist Generator
Factory Acceptance Test checklist based on system type.
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SAT Checklist
Site Acceptance Test checklist for instrumentation and control systems.