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PROCESS PLANTS / INTERACTIVE 3D

Flare-system path concept

Trace six static relationships through an original connected scene with a liquid knock-out drum, separate seal-vessel illustration and hollow elevated stack.

The two vessel models and hollow stack are independently illustrated roles at invented scales. No pilot, purge, gas seal, relief capacity, working liquid seal, combustion result or operating procedure is established.

Static preview of the flare-system path concept schematic
Static preview · choose Load 3D to explore

All conceptual paths visible

Drag to orbit · Scroll or pinch to zoom · Select a visible part or use the parts list. Keyboard: focus the view and use arrow keys to orbit.

HOW TO READ THIS MODEL

The system, explained.

The U.S. EPA describes flare-system gas collection, removal of entrained liquid in a knock-out drum, a possible downstream liquid seal and an elevated stack and tip. This original scene places two independently authored vessel models beside a new hollow stack illustration at invented scales. Follow the separate gas and liquid boundaries, inspect the actual stack-side opening and notice where the picture ends above the tip. The visible lines are teaching relationships, not piping, a relief system or a designed Alberta flare.

Model scope and limits

Original static 3D scene reuses two separately authored vessels and adds a new hollow two-module stack with a real lateral bore, open tip location, pilot-position envelopes, four open scene boundaries and six route cues. The vessels are rescaled and placed at invented positions, not selected for a compatible system. No actual gas collection header, relief source, purge supply, gas seal, pilot burner, ignition, monitoring, working liquid head, flashback prevention, stack height, structural calculation, pressure drop, liquid-removal duty, flare efficiency, emissions reduction, atmospheric dispersion, safe operating state or regulatory compliance is established. No product CAD, source artwork or plant dimensions imported.

Further reading: U.S. EPA OAQPS Control Cost Manual: general flare-system process equipment roles; no drawing or dimensions copied ↗

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

CHECK YOUR UNDERSTANDING

What does the open boundary above the illustrated tip establish?

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. Begin at the open collection boundary

    The scene begins with an unresolved gas source. Real relief sources, header design and protection cannot be inferred from this marker.

  2. Follow gas toward liquid removal

    This static line connects two roles but is not fabricated piping or evidence of line size, capacity or pressure loss.

  3. Inspect the knock-out drum

    The separate original vessel has a hollow wall and named inlet, gas and liquid boundaries. It does not prove removal performance or upset capacity.

  4. Keep collected liquid separate

    The lower open collar leads only to an unresolved liquid-handling boundary. Storage, pumping, treatment and disposal are outside the scene.

  5. Compare a liquid-seal role

    The independent vessel illustrates an immersed inlet leg and static liquid plane. It is not a working seal or proof of flashback prevention.

  6. Find the real stack-side opening

    The original lower riser has an actual lateral bore adjacent to a hollow inlet. The open geometry does not specify a rated joint or hydraulic behaviour.

  7. Look through the elevated tip location

    The annular tip is open. Pilot-position envelopes are markers only; no burner, flame, ignition or combustion result is modeled.

  8. Stop above the tip

    The final open boundary marks where the illustration stops, before emissions, dispersion and regulatory claims can be assessed.

Additional primary references: U.S. EPA OAQPS Control Cost Manual, flare process description: collection header, knock-out drum, optional separate liquid seal, elevated stack and tip; no source geometry copied ↗

Inspect each vessel separately.

Open the detailed knock-out drum ↗Open the detailed liquid-seal illustration ↗

The two original vessel drawings were rescaled for this learning scene; their geometry does not establish a compatible or safe flare system.

CONNECTED PROCESS LESSON

Trace an illustrative flare-system path

Two independently authored vessels and a new original hollow stack/tip illustration at invented scales. Static routes and open boundaries show roles only; no engineered flare installation, protection or emissions result.

Color and static arrows identify declared relationships only. The model has no measured flow, live plant data or industry color standard. Treatment, pressure reduction, vapour handling, measurement, relief, shutdown, containment and disposal systems are outside this illustration.

Liquid removal before the stack

The separately authored drum offers a visible liquid-removal role. No sizing, removal result or upset capacity is established.

Open component explorer ↗

Separate liquid-seal illustration

The independent seal-drum model shows a static submerged-leg relationship. No liquid head, purge, flashback prevention or operating protection is proven.

Open component explorer ↗

Elevated stack and open tip location

A hollow riser leads to an open tip location. The marker envelopes do not represent a functional pilot, flame or validated stack design.

Process vent gas enters

Actual relief sources, collection header and upstream controls are not represented.

Knock-out liquid to further handling

Storage, treatment, levels, pumps and disposal are outside this scene.

Seal-vessel liquid to further handling

Storage, treatment, levels, pumps and disposal are outside this scene.

Open end beyond tip

Combustion, pilot status, plume and emissions are not represented.

Read each connection.

Start and end labels are backed by the same port registry used to generate the 3D routes. Ports and routes are invented; geometric agreement is not engineering validation.

GAS

Header reaches liquid knock-out role

Process vent gas enters → Liquid removal before the stack

GAS

Gas reaches separate liquid-seal role

Liquid removal before the stack → Separate liquid-seal illustration

LIQUID

Knock-out liquid reaches open handling boundary

Liquid removal before the stack → Knock-out liquid to further handling

GAS

Gas reaches elevated stack inlet

Separate liquid-seal illustration → Elevated stack and open tip location

LIQUID

Seal-vessel liquid reaches open handling boundary

Separate liquid-seal illustration → Seal-vessel liquid to further handling

GAS

Tip location reaches open atmospheric boundary

Elevated stack and open tip location → Open end beyond tip

Primary reading: U.S. EPA OAQPS Control Cost Manual, flare system process description; broad equipment roles only ↗

ACCESSIBLE COMPONENT REFERENCE

Every part, in plain language.

Search all components ↗Model provenance ↗
Base frame

Illustrative support frame; foundations and structural design vary.

Liquid knock-out drum / Dished closure 1

Generic double-surface dished closure. Shape and thickness are illustrative, with no code qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Dished closure -1

Generic double-surface dished closure. Shape and thickness are illustrative, with no code qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / External gas-path arrow head

Static reading arrow outside the vessel. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / External gas-path arrow shaft

Reading direction only; no actual velocity, combustion or gas flow. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Gas outlet bored end collar

Separate open collar without a rated face, gasket or matched pipe. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Gas outlet hollow neck

Open boundary at the drilled wall. No selected connection, instrument or destination. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Head seam marker 1

Illustrative junction location, without weld design. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Head seam marker -1

Illustrative junction location, without weld design. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Header inlet bored end collar

Separate open collar without a rated face, gasket or matched pipe. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Header inlet hollow neck

Open boundary at the drilled wall. No selected connection, instrument or destination. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Illustrative liquid-region plane

Static colour boundary only. It is not actual liquid, capacity or a live gauge. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Inlet impact plate

Independent splash/impact location. No selected baffle, strength or droplet-removal performance. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Inlet plate standoff 1

Geometric location marker without weld, load or material specification. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Inlet plate standoff 2

Geometric location marker without weld, load or material specification. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Inlet plate standoff 3

Geometric location marker without weld, load or material specification. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Knock-out drum hollow shell

Separate outer and inner cylindrical surfaces with real wall openings. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Liquid collection outlet bored end collar

Separate open collar without a rated face, gasket or matched pipe. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Liquid collection outlet hollow neck

Open boundary at the drilled wall. No selected connection, instrument or destination. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Lower level boundary bored end collar

Separate open collar without a rated face, gasket or matched pipe. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Lower level boundary hollow neck

Open boundary at the drilled wall. No selected connection, instrument or destination. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support 2.03 anchor 1 smooth rod

Location marker; no embedded anchor or clamp load. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support 2.03 anchor 1 washer

Independent annular washer location. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support 2.03 anchor 2 smooth rod

Location marker; no embedded anchor or clamp load. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support 2.03 anchor 2 washer

Independent annular washer location. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support -2.03 anchor 1 smooth rod

Location marker; no embedded anchor or clamp load. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support -2.03 anchor 1 washer

Independent annular washer location. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support -2.03 anchor 2 smooth rod

Location marker; no embedded anchor or clamp load. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support -2.03 anchor 2 washer

Independent annular washer location. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support foot 2.03

Base location with two true anchor openings. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Support foot -2.03

Base location with two true anchor openings. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Upper level boundary bored end collar

Separate open collar without a rated face, gasket or matched pipe. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Upper level boundary hollow neck

Open boundary at the drilled wall. No selected connection, instrument or destination. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Vessel support saddle 2.03

Separate support location without load or foundation design. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Liquid knock-out drum / Vessel support saddle -2.03

Separate support location without load or foundation design. Original invented teaching geometry; no design, rating, liquid-removal performance, flare safety or service qualification. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Illustrative liquid-seal drum / 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. Reused at an invented scale and location; no equipment matching, protection or field selection is implied.

Stack foundation marker

Visible base location only; foundations and loads are outside the lesson. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Hollow lower stack barrel

Open cylindrical lower wall with a real side inlet bore. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Hollow upper stack barrel

Separate open-ended upper wall; gas seal and internal hardware are omitted. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Header-side open stack inlet

Hollow side boundary meeting the lower wall bore. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Open stack collar 4.25

Annular open marker; no welded joint, pressure class or burner design. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Open stack collar 8.55

Annular open marker; no welded joint, pressure class or burner design. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Open tip location

Open elevated location only; no flame, combustion efficiency or plume is depicted. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Pilot-location envelope left

Open marker for a possible pilot position; no pilot burner, fuel, ignition, monitoring or operation. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Pilot-location support left

Schematic marker support, not a fabricated bracket. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Pilot-location envelope right

Open marker for a possible pilot position; no pilot burner, fuel, ignition, monitoring or operation. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Pilot-location support right

Schematic marker support, not a fabricated bracket. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Lower stack support marker -1

Schematic base marker without structural or anchor calculation. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Lower stack support marker 1

Schematic base marker without structural or anchor calculation. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Stack seam location 2.50

Visible seam marker; no weld, corrosion or inspection requirement is specified. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Stack seam location 5.15

Visible seam marker; no weld, corrosion or inspection requirement is specified. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Stack seam location 7.70

Visible seam marker; no weld, corrosion or inspection requirement is specified. Invented teaching geometry. No stack rating, hydraulic design, flame stability, pilot/ignition system, purge, gas seal, structural design, emissions result or operating instruction.

Process vent gas / open upstream boundary

Open upstream gas-collection boundary; sources and protections are outside the scene.

Knock-out liquid to further handling / open boundary

Open liquid-handling boundary. No drain system, destination or operation is designed.

Seal-vessel liquid to further handling / open boundary

Open liquid-handling boundary. No drain system, destination or operation is designed.

Above tip / open atmospheric boundary

Open teaching boundary; no actual flame, emission or atmospheric dispersion is calculated.

Route / Header reaches liquid knock-out role

Original static relationship; not actual process pipe, relief routing, gas flow or safe operation.

Direction / Header reaches liquid knock-out role

Fixed reading arrow, without measured quantity, pressure, velocity or operating state.

Route / Gas reaches separate liquid-seal role

Original static relationship; not actual process pipe, relief routing, gas flow or safe operation.

Direction / Gas reaches separate liquid-seal role

Fixed reading arrow, without measured quantity, pressure, velocity or operating state.

Route / Knock-out liquid reaches open handling boundary

Original static relationship; not actual process pipe, relief routing, gas flow or safe operation.

Direction / Knock-out liquid reaches open handling boundary

Fixed reading arrow, without measured quantity, pressure, velocity or operating state.

Route / Gas reaches elevated stack inlet

Original static relationship; not actual process pipe, relief routing, gas flow or safe operation.

Direction / Gas reaches elevated stack inlet

Fixed reading arrow, without measured quantity, pressure, velocity or operating state.

Route / Seal-vessel liquid reaches open handling boundary

Original static relationship; not actual process pipe, relief routing, gas flow or safe operation.

Direction / Seal-vessel liquid reaches open handling boundary

Fixed reading arrow, without measured quantity, pressure, velocity or operating state.

Route / Tip location reaches open atmospheric boundary

Original static relationship; not actual process pipe, relief routing, gas flow or safe operation.

Direction / Tip location reaches open atmospheric boundary

Fixed reading arrow, without measured quantity, pressure, velocity or operating state.