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Once-through steam generator cutaway

Open 15 separate tube runs, 13 hollow return bends and the boundaries of an illustrative SAGD steam-generation unit.

Static preview of the once-through steam generator cutaway schematic
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HOW TO READ THIS MODEL

The system, explained.

A once-through steam generator heats water as it travels through tubes. This original open-front cutaway separates an incoming feedwater boundary, seven convection-section runs, a transition and eight radiant-section runs, then ends at an open wet-steam boundary. A separate burner-side opening and open stack help distinguish heating and exhaust roles from the water-side path. An Alberta public project description illustrates convection before radiant heating and a downstream steam separator, but this teaching model copies no project layout. Colour, size, route and component count are invented. No water treatment system, separator, injection network or verified plant is attached.

Model scope and limits

Original generic 63-part cutaway with open-front enclosure, seven hollow convection runs, eight hollow radiant runs, thirteen separate hollow return bends, a hollow transition, actual enclosure and roof bores, open burner-side and stack boundaries, and static heat markers. It has no recirculation loop. Tube and casing proportions, paths, colours and openings are invented. No specific boiler, fired-heater design, steam quality, heat duty, pressure, fuel-air ratio, flame, draft, emissions, water chemistry, fouling, materials, tube support, controls, relief, shutdown, integrity, construction, regulatory suitability or qualified operation is represented.

Further reading: Government of Alberta oil-sands glossary: once-through steam generator definition ↗

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

CHECK YOUR UNDERSTANDING

What does the open outlet of this teaching generator 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. Start at the treated-water boundary

    This open connection represents water supplied to a generator. Treatment, source, pumps and water quality remain separate questions.

  2. Trace a convection run

    One of seven separately hollow tube runs in the first heating section. Its blue colour is a reading aid, not a measured fluid state.

  3. Inspect an open return

    The U shape is separately hollow and open. It helps trace the imagined one-way path but supplies no bending radius or fabrication detail.

  4. Follow the section change

    The open bridge moves the visual teaching path from the convection bank to the lower radiant bank. It is not a selected pipe or field routing.

  5. Open a radiant tube

    The gold run belongs to the second heating section. Tube metal temperature, heat transfer and steam quality are not calculated.

  6. Identify the heating boundary

    This hollow side opening marks where a generic heating role is shown. No burner, flame, fuel train or protection logic is designed.

  7. Separate exhaust from steam

    The open stack is on the gas side, distinct from the water-side tube outlet. No emissions or draft result follows from its shape.

  8. Find the next process boundary

    The open outlet ends this generator scene. Compare the separate separator model for a possible next role; the two are not connected, conditioned or qualified as a plant.

  9. Read the shell as a cutaway

    The front has been deliberately omitted to show internals. The enclosure is a teaching shape, not a complete casing or heat-loss specification.

Additional primary references: Government of Alberta oil-sands glossary: once-through steam generator definition; checked September 27, 2026 ↗ · Imperial Oil Cold Lake Expansion public project description, section 3.2.2.7: example convection, radiant and downstream separator roles; not a source of model art or dimensions ↗

Explore the SAGD steam-side roles.

Follow the connected teaching scene ↗Inspect the steam and liquid separator ↗Inspect the injector and producer well pair ↗

The connected scene places three separate original models beside five illustrative paths. It is not a matched plant; water treatment, piping, steam quality, pressure control, blowdown handling and operating conditions remain unverified.

ACCESSIBLE COMPONENT REFERENCE

Every part, in plain language.

Search all components ↗Model provenance ↗
Generator skid base

Visual support footprint, not a foundation or transportable skid design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant rear enclosure

Open-front enclosure section; insulation, casing joints and access are omitted. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant left enclosure

Open-front enclosure section; insulation, casing joints and access are omitted. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant right enclosure

Open-front enclosure section; insulation, casing joints and access are omitted. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant roof

Open-front enclosure section; insulation, casing joints and access are omitted. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant floor

Open-front enclosure section; insulation, casing joints and access are omitted. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection rear enclosure

Open-front enclosure section; insulation, casing joints and access are omitted. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection right enclosure

Open-front enclosure section; insulation, casing joints and access are omitted. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection lower transition

Open-front enclosure section; insulation, casing joints and access are omitted. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection roof

Roof with a true stack opening; draft and flue-gas performance are not modeled. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection tube run 1

Hollow open tube segment in the conceptual feedwater heating path. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection return bend 1

Separate hollow U return between adjacent teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection tube run 2

Hollow open tube segment in the conceptual feedwater heating path. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection return bend 2

Separate hollow U return between adjacent teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection tube run 3

Hollow open tube segment in the conceptual feedwater heating path. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection return bend 3

Separate hollow U return between adjacent teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection tube run 4

Hollow open tube segment in the conceptual feedwater heating path. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection return bend 4

Separate hollow U return between adjacent teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection tube run 5

Hollow open tube segment in the conceptual feedwater heating path. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection return bend 5

Separate hollow U return between adjacent teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection tube run 6

Hollow open tube segment in the conceptual feedwater heating path. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection return bend 6

Separate hollow U return between adjacent teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection tube run 7

Hollow open tube segment in the conceptual feedwater heating path. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Open feedwater inlet

Open feedwater boundary. Treatment, pumps and water quality are outside this model.

Feedwater inlet collar

Unrated, open boundary marker, not a selected flange.

Convection bank support 1

Schematic tube-location bar, not structural or thermal support design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection bank support 2

Schematic tube-location bar, not structural or thermal support design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection bank support 3

Schematic tube-location bar, not structural or thermal support design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection bank support 4

Schematic tube-location bar, not structural or thermal support design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection-to-radiant transition

Static path from the lower convection-bank role toward the first radiant run. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil run 1

Separate hollow radiant-section tube. The colour only distinguishes the study path.

Radiant return bend 1

Separate hollow U return between radiant-section teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil run 2

Separate hollow radiant-section tube. The colour only distinguishes the study path.

Radiant return bend 2

Separate hollow U return between radiant-section teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil run 3

Separate hollow radiant-section tube. The colour only distinguishes the study path.

Radiant return bend 3

Separate hollow U return between radiant-section teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil run 4

Separate hollow radiant-section tube. The colour only distinguishes the study path.

Radiant return bend 4

Separate hollow U return between radiant-section teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil run 5

Separate hollow radiant-section tube. The colour only distinguishes the study path.

Radiant return bend 5

Separate hollow U return between radiant-section teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil run 6

Separate hollow radiant-section tube. The colour only distinguishes the study path.

Radiant return bend 6

Separate hollow U return between radiant-section teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil run 7

Separate hollow radiant-section tube. The colour only distinguishes the study path.

Radiant return bend 7

Separate hollow U return between radiant-section teaching runs. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil run 8

Separate hollow radiant-section tube. The colour only distinguishes the study path.

Open wet-steam outlet path

Open outlet toward a separate steam/liquid separation role. It does not state steam quality. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Wet-steam outlet collar

Unrated open outlet boundary; separator and injection well remain outside the model. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil support 1

Illustrative coil-position bar, not a high-temperature support design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil support 2

Illustrative coil-position bar, not a high-temperature support design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil support 3

Illustrative coil-position bar, not a high-temperature support design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Radiant coil support 4

Illustrative coil-position bar, not a high-temperature support design. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Open burner register

Hollow boundary marking a generic fuel-air heating role; no burner specification or flame stability.

Burner outer marker

Schematic register ring; not a certified burner opening. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Burner-side housing

Simple casing on the heating side, without controls, trip devices or fuel train. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Illustrative heat marker 1

Static visual heat marker, not a burner flame or temperature field. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Illustrative heat marker 2

Static visual heat marker, not a burner flame or temperature field. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Illustrative heat marker 3

Static visual heat marker, not a burner flame or temperature field. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Open exhaust stack

Hollow open exhaust boundary. No draft, emissions rate, treatment or stack design is established.

Stack base ring

Separate open stack base marker with no structural or joint rating. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Stack upper rim

Open exhaust rim, without cap, arrestor or emissions-control claim. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection gas-side marker 1

Static transverse marker distinguishes gas-side space from the water-side tubes; not a calculated baffle. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection gas-side marker 2

Static transverse marker distinguishes gas-side space from the water-side tubes; not a calculated baffle. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.

Convection gas-side marker 3

Static transverse marker distinguishes gas-side space from the water-side tubes; not a calculated baffle. Invented schematic geometry only. No tube schedule, fired-heater design, steam quality, heat duty, pressure, combustion, emissions, materials, controls or safe-service qualification.