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VESSELS / INTERACTIVE 3D

Flare liquid-seal vessel cutaway

Trace an open bent inlet into a separate vertical seal vessel and compare its liquid and gas boundaries with the upstream knock-out drum.

Static preview of the flare liquid-seal vessel cutaway schematic
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HOW TO READ THIS MODEL

The system, explained.

The U.S. EPA describes a liquid seal as a possible stage between a flare knock-out drum and the flare stack. This generic cutaway gives that stage its own vessel: an open header-side inlet turns downward, a blue plane marks an illustrative liquid surface, and a separate upper outlet marks the downstream gas boundary. The inlet leg, outlet, drain and two level-connection locations can be selected individually. The knock-out drum removes entrained liquid; this lesson instead helps readers locate a possible liquid-seal stage. The drawn immersion and static arrow do not demonstrate gas movement, a maintained seal, flashback protection or a functioning flare system.

Model scope and limits

Generic static cutaway with separate hollow vessel wall, open inlet leg, upper gas outlet, lower drain, two level boundaries and a flat liquid-surface marker. The surface has no measured level or liquid head, and no pressure, flow, bubble, purge or backflow behaviour is calculated. The model does not establish a qualified flame barrier, flare operation, permitted installation, structural design, connection rating, level control or liquid handling route. Consult qualified engineering and current regulatory requirements for real equipment.

Further reading: U.S. EPA Air Pollution Control Cost Manual, Chapter 1: flare-system component roles ↗

Source links support further study; no affiliation or endorsement is implied.

CHECK YOUR UNDERSTANDING

What can the blue plane and immersed inlet leg establish here?

Choose an answer

GUIDED COMPONENT STUDY

Trace the system.

Read each explanation, then focus its component in the explorer. This is a learning route through the model, with no operating or maintenance sequence.

  1. Find the header-side boundary

    This open collar marks a possible connection from the upstream header. It is not a designed connection to the separate knock-out drum model.

  2. Trace the bend and downleg

    The single hollow tube turns downward through the vessel. Its shape helps locate the concept without specifying a gas rate or installed pipe.

  3. Look below the marked surface

    The separate open-end marker lies below the blue plane. Geometric immersion alone proves no liquid seal or flashback protection.

  4. Interpret the blue plane

    The blue surface has an arbitrary height. It is not an inventory reading, required liquid head or operating level.

  5. Read the complete enclosure

    The full 3D vessel wall surrounds the leg and has actual side openings. Its dimensions and construction do not define a pressure vessel.

  6. Follow the upper boundary

    The open neck marks a possible downstream direction. No flare stack, purge arrangement or combustion component is attached.

  7. Find liquid removal

    This lower opening marks a separate liquid boundary. Pumping, treatment, disposal and control are beyond this model.

  8. Separate the level connections

    The two side openings sit at different heights. No instrument, alarm, control logic or protective setpoint is depicted.

  9. End at the model boundary

    The bored collar remains open. It supplies no rated flange, compatible pipe, safe discharge route or proof of operation.

Additional primary references: U.S. EPA flare chapter: distinct knock-out, liquid-seal and downstream flare roles ↗ · Alberta Energy Regulator Directive 060: upstream flaring, incinerating and venting requirements ↗

Compare flare-system roles.

Inspect the upstream knock-out drum ↗Trace the connected flare-system lesson ↗

The connected scene reuses these two independent drawings at invented scales and adds a hollow stack and static route cues. It is not a matched installation and does not establish protective or combustion performance.

ACCESSIBLE COMPONENT REFERENCE

Every part, in plain language.

Search all components ↗Model provenance ↗
Seal-vessel hollow wall

Vertical open-ended shell with actual side passages. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Upper vessel closure

Upper enclosing plate with a real outlet opening. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Lower vessel closure

Lower enclosing plate with a real drain opening. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Lower shell seam marker

Visible junction marker, not a weld or inspection record. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Upper shell seam marker

Visible junction marker, not a weld or inspection record. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Bent inlet and submerged leg

One open tube enters from the header side and turns downward below the static blue surface. The illustrated immersion does not establish a functioning seal. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Header-side inlet collar

Open connection boundary; upstream knock-out drum and header are outside this model. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Submerged leg outlet ring

Separate open end marker inside the liquid region; no bubble, backflow or pressure behaviour is simulated. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Illustrative liquid surface

Static reading plane. It is not water inventory, a measured level, calculated liquid head or proof of a protective seal. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Liquid surface edge marker

Circular level-reading marker at an arbitrary height. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Downstream gas outlet neck

Open upper destination toward downstream flare equipment, which is not modeled. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Downstream outlet collar

Unrated open boundary marker; no connected stack, purge or flare tip. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Lower liquid drain neck

Open liquid-removal boundary. Storage, treatment and controls are outside the model. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Drain outlet collar

Unrated annular drain boundary; no disposal or closed valve is shown. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Lower level boundary neck

Open instrument connection location without a gauge, control logic or setpoint. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Lower level boundary collar

Separate bored connection marker, without a rated joint. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Upper level boundary neck

Open instrument connection location without a gauge, control logic or setpoint. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Upper level boundary collar

Separate bored connection marker, without a rated joint. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Support leg -0.68 -0.68

Independent support position without structural or foundation design. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Support foot -0.68 -0.68

Foot with a geometric anchor opening; no fastener specification. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Support leg -0.68 +0.68

Independent support position without structural or foundation design. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Support foot -0.68 +0.68

Foot with a geometric anchor opening; no fastener specification. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Support leg +0.68 -0.68

Independent support position without structural or foundation design. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Support foot +0.68 -0.68

Foot with a geometric anchor opening; no fastener specification. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Support leg +0.68 +0.68

Independent support position without structural or foundation design. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

Support foot +0.68 +0.68

Foot with a geometric anchor opening; no fastener specification. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

External reading arrow shaft

Static reading direction outside the vessel; not a gas velocity or operating state. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.

External reading arrow head

Static downstream-direction marker outside the vessel. Invented educational geometry only; no selected liquid head, gas duty, pressure rating, flashback protection or operating instruction.