Design Hub IndiaOIL & GAS ENGINEERING

V-100 · THREE-PHASE SEPARATOR · LIVE MODEL

See inside the equipment you design.

Courses, calculators and video series for process & mechanical engineers.

STATIC VIEW · 3D is switched off on this device to save data and battery.

Interactive 3D model of a horizontal three-phase separator. Well fluid enters at the left through an inlet diverter; gas rises through a mist extractor to the top outlet; oil spills over a weir into its own bay; water settles below the oil–water interface. Use the chapter steps and the part buttons to explore.

V-100 · THREE-PHASE SEPARATOR · LIVE MODEL

See inside the equipment you design.

Courses, calculators and video series for process & mechanical engineers.

Explore courses Try free calculators

STATIC VIEW · 3D is switched off on this device to save data and battery.

1/4

Reduced motion is on, so the animation starts paused. Use the steps, or press play.

Reduced motion is on, so the animation starts paused.

HOW A THREE-PHASE SEPARATOR WORKS · 4 STEPS

Reduced motion is on, so the animation starts paused. Tap a step, or press play.

01 · CALCULATORS

Calculators that show you the answer.

Every tool shows its inputs, method and governing code — so you can check the number, not just copy it.

All calculators →

FEATURED · SEPARATOR SIZINGFREE

Size the shell. Watch the vessel answer.

Open full calculator →

Inside diameter1,500 mm

6003,600 mm

Length / diameter (L/D)3.5

2.06.0 · seam to seam

Liquid level50 % of ID

20 %80 %

Liquid flow rate60 m³/h

5400 m³/h · oil + water

SEAM-TO-SEAM LENGTH mL = D × L/D

VESSEL VOLUME m³πD²L/4 + 2 × πD³/24

LIQUID AREA FRACTION %(θ − sin θ) / 2π, θ = 2·acos(1 − 2h/D)

LIQUID HOLD-UP · SHELL m³f × πD²/4 × L

RETENTION TIME minhold-up ÷ liquid flow

GAS FLOW AREA m²(1 − f) × πD²/4

PRELIMINARYGeometry and retention only: hold-up uses the shell, not the heads. Gas capacity (Souders–Brown), slenderness and API 12J retention guidance are in the full calculator. Verify before design use.

API RP 14EFREE

Line SizingErosional velocity and pressure drop for process lines.IN flow, ρ, μ, ID · OUT v, ΔP, VeOpen calculator →

API 12JFREE

Separator SizingGas capacity and liquid retention for two- and three-phase separators.IN Qg, QL, ρ, K · OUT D, L, tOpen calculator →

API 520 / 521FREE

PSV SizingRequired relief orifice area and the next standard orifice letter.IN W, P1, T, Z, M · OUT A, orificeOpen calculator →

ASME B31.3 · MOREFREE

All free calculatorsPipe wall, pump NPSH, LMTD, control valve, unit converter and more.ONE PAGE · METHOD SHOWN ON EVERY RESULTSee all →

ASME VIII DIV. 1PAID

Pressure Vessel CalculatorShell, heads, nozzles and flanges in your browser. One-time purchase.IN P, T, D, material, CA · OUT t, MAWPSee the calculator →

API 12J · 3-PHASEPAID

HSEP-Designer+Three-phase horizontal separator sizing tool.IN Qg, Qo, Qw, ρ · OUT D, L, levelsSee the tool →

02 · COURSES

Seven courses. One plant, end to end.

Video lessons built around real equipment. Watch the first lessons free.

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03 · LEARNING PATH

Your path, drawn as a network.

Lines show the recommended order. Start with the free lessons, then follow the lines.

04 · VIDEO SERIES

Free on YouTube.

74.6K subscribers and 650+ free videos — start with a series.

Subscribe on YouTube

SERIES · 10 PARTSHow to Read a P&IDSymbols, lines, tags and loops — one drawing at a time.

SERIES · API 520 / 521PSV SeriesRelief scenarios, orifice sizing and back pressure, explained.

SERIES · 8 PARTS · ASME VIII-1Pressure Vessel DesignOne separator designed end to end: shell, heads, nozzles and supports.

05 · FAILURE LAB

Break it here, so you never break it on site.

Flip a fault and watch what the equipment does. Then learn why.

BEFORE · PSV IN SERVICEPressure rises to the set point, the PSV lifts and relieves to flare, and pressure is held.

Illustrative teaching scenario. In service, PSV isolation valves are locked or car-sealed open for exactly this reason.

Learn relief in the PSV course

BEFORE · PSV IN SERVICEAFTER · PSV ISOLATED

06 · HOW YOU PAY

Free to start. Pay once per course.

Watch the first lessons and use the calculators free. Unlock a full course with one payment.

Free access and full course compared
WHAT YOU GET	Free$0	Full courseOne payment
Free calculators — separator, PSV, line sizing and more	Included	Included
Method and code reference on every result	Included	Included
YouTube video series	Included	Included
First lessons of every course, and the full Instrumentation course	Included	Included
Every lesson of the course	Not included	Included
Certificate of completion	Not included	Included
Lifetime access and a 7-day refund	Not included	Included
	Start free	See courses