Exhaust Gas Economizer

high 18 / 18 models (Inspector)

An exhaust gas economizer sits in the main engine exhaust uptake and raises steam from waste heat alone, without its own burner, which is what separates it from an oil-fired auxiliary boiler that makes steam on demand regardless of engine load.

Read more — Exhaust Gas Economizer explained ▾

What sets this type apart

An exhaust gas economizer is a heat exchanger, not a combustion boiler: exhaust gas from the main engine passes over a bank of finned tubes, and the heat it would otherwise vent to atmosphere raises steam or heats thermal oil instead. It has no burner of its own, so its steam output tracks main engine load directly. At low load or manoeuvring, exhaust temperature and flow drop and steam production falls with them, which is why most installations still keep an oil-fired auxiliary boiler for port stays and low-load conditions.

Exhaust gas economizer flow — Flow schematic of an exhaust gas economizer, showing main engine exhaust gas passing over a tube bundle in red, and feed water entering the steam drum in blue and leaving as saturated steam.

Main components

Tube bank

Finned steel tubes arranged for cross-flow of exhaust gas, sized to recover heat without imposing excessive backpressure on the main engine.

Steam drum

Collects generated steam and separates it from circulating water in a forced-circulation design, feeding the ship's steam services.

Circulation pump

Forced-circulation economizers use a pump to move water through the tube bank rather than relying on natural convection, giving more even heat transfer and less risk of local dry-out.

Soot blowers

Steam or compressed-air lances that periodically clear soot deposits from the tube surfaces; deposits are the single biggest threat to this equipment.

Water washing arrangement

Fixed piping for periodic fresh water washing of the tube bank, used at low load or in port when soot fires would otherwise be more likely.

Selection and sizing

Sizing is driven by main engine exhaust flow and temperature at normal sea speed, the steam demand the vessel actually needs to cover (cargo heating on tankers, fuel oil heating, accommodation services), and the allowable exhaust backpressure the engine maker permits. Oversizing the tube bank for heat recovery without checking backpressure can quietly cost fuel efficiency on the main engine itself.

Regulations and class

Class rules require periodic internal and external inspection of the pressure parts as a boiler, including the tube bank, drum and safety valves, on the same survey cycle as other steam-generating equipment. Fire risk from soot accumulation is addressed through class guidance on soot blower and water washing frequency rather than a fixed statutory interval, and MARPOL Annex VI exhaust temperature and backpressure limits from the main engine maker constrain how much fouling can be tolerated before cleaning is mandatory.

Typical faults

Soot fire in the tube bank -- unburned fuel deposits accumulate and ignite from a hot spot; the consequence ranges from tube damage to a serious exhaust uptake fire if soot blowing has been skipped.
Tube fouling from irregular soot blowing -- deposits build steadily; the consequence is falling steam output and rising exhaust backpressure that eats into main engine efficiency.
Tube corrosion from sulphuric acid dew point -- running with cold feedwater below the acid dew point of the exhaust gas; the consequence is accelerated tube wall thinning and eventual leaks.
Circulation pump failure -- loss of forced flow through the tube bank; the consequence is local overheating and tube damage if the unit is not shut down promptly.

What to look for in a supplier

Tube bank material and fin design suited to the fuel sulphur content the vessel actually burns, not a generic low-sulphur assumption.
Soot blower and water washing systems sized for the tube geometry supplied, with accessible lances for maintenance.
Documented backpressure figures at the tube bank so the impact on main engine performance can be checked against the engine maker's limit.
Spare tube sections or repair sleeves available without a long lead time, since tube leaks are the most common failure needing replacement parts.

Keep feedwater temperature above the acid dew point whenever the engine is running on higher-sulphur fuel -- cold feedwater is the quiet cause behind most premature tube corrosion, long before soot fires get the blame.

8000h

Service Interval

25 yr

Typical Lifetime

Typical Manufacturers

Aalborg Kangrim Usui

Inspector Mode Show All 18 / 18 with inspector value

4 manufacturers · 18 models

Alfa Laval

AV-6N

2-8 t/h steam @ 7 bar · Exhaust Gas → Steam · Exhaust gas economizer (water‑tube boiler)

Medium

Exhaust Gas → Steam

Type

Finned Tube EGE

Technical Specifications

Betriebsdruck (typisch): 5-30 bar(g), max. 65 bar(g)
Design-Druck XS-TC7A: 10 bar(g)
Pinch Point: 10-20°C (Minimum 5°C)
Rohrbauart: Rauchrohr (XS-Serie), Wasserrohr (AV-6N, XW), mit Rippen (gilled tubes)
Zirkulation: Natürlich (AV-6N Standard), Erzwungen (XW, Forced Circulation Optionen)
Größe: XS-TC7A: Kompakteste Rauchrohr-Economizer am Markt
Materialien/fouling: Helix-Rohre, vertikales Design mit hoher Gasgeschwindigkeit minimiert Verschlammung

Product Lines

Aalborg XS-TC7A (Smoke-Tube Economizer)
Aalborg AV-6N (Water-Tube Boiler, Natural Circulation)
Aalborg XW / XW-TG (Water-Tube Economizer, Forced Circulation)
Aalborg XS-2V / XS-7V (Smoke-Tube Economizers)
Aalborg Micro (Compact Waste Heat Recovery)
Aalborg H/HW (Waste Heat Recovery after Gas/Diesel Engines)

Boiler Type

Alfa Laval Aalborg Exhaust Gas Boiler / Economizer (Abgaskessel / Abgaswärmetauscher)

Common Failures & Inspection Points

Area: Rohrverschlammung / Rußabbrand-Gefahr (Soot Fouling)
Check: Visual inspection of gas side for soot buildup, exhaust temperature measurement: >10-20°C above setpoint indicates sludging; perform water flushing kit application (50 l/min, 0.4-0.6 MPa pressure); operate Soot-Blower daily 3x (caution: In case of uptake fire DO NOT blow down with steam due to H₂ fire hazard)
Area: Rohrleckage / Korrosion / Erosion (Tube Leakage)
Check: Internal inspection test (opening of sight glasses/hand ports): inspect tubes for wear, pitting, thinning; external inspection for soot deposits, blistering, sag; perform hydraulic pressure test at 1.25 × operating pressure for maximum 10 minutes
Area: Druckbehälter-Klassbesichtigung / Periodische Inspektion
Check: Class surveyor: Inspect all boilers >3.5 bar working pressure and >4.65 m² heating surface. Frequency: DNV/LLOYDS every 2 years up to 8 years old, then annually; 2 comprehensive internal inspections per 5-year period, interval maximum 36 months. Inspect internal surfaces (drums, headers) for sludging, corrosion, cracks.
Area: Sicherheitsventile / Überdruckschutz
Check: Safety valve test: opening at ≤3% above working pressure; test pressure 15% above working pressure for maximum 10 minutes (feedwater only for water level safety); pressure rise during test maximum 10% above design pressure at full load firing with stop valves closed.
Area: Wasserspiegel-Schauglas / Schutzeinrichtungen
Check: Sight glass visual inspection for highest, lowest, normal water level markings; protective devices without sight obstruction; test water cushion safety ball valve for function; check drain line for safety.
Area: Refractory / furnace room (only for fired boilers); tube bundle cleaning (XS-TC7A helix tubes)
Check: For Aalborg OL/D and similar burner boilers: inspect refractory material (membrane walls, furnace floor) for cracks, deformation, separation; remove carbon deposits. For XS-TC7A: clean helix tube bundle with water flush kit (7–8 hours on similar ships), if necessary add cleaning chemicals before discharge to slop tank.

Type-universal inspection points for Alfa Laval Aalborg Exhaust Gas Boiler / Economizer (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Service: SOOT FIRE RISK — monitor exhaust gas temperature differential. Soot blow regularly. Annual tube inspection. CO₂ smothering system mandatory.

Spare Parts: Aalborg Industries (Alfa Laval): Keep burner nozzle set, photocell and gaskets onboard. Lead time: 3–8 weeks for tubes.

Strengths

Compact design – one of the smallest smoke‑tube economizers on the market
Helix‑type tubes and high gas velocity minimise soot fouling
Natural circulation eliminates the need for pumps or forced‑circulation systems
Wide operating pressure range (5–30 bar, max 65 bar) suitable for many ship steam demands
Low pinch point (10‑20 °C) improves overall heat‑recovery efficiency

Weaknesses

Maximum design pressure of 65 bar limits use on very high‑pressure steam systems
Natural circulation may restrict maximum steam output compared with forced‑circulation models
Requires diligent soot‑blowing and periodic tube cleaning to avoid fouling
Less flexible for retrofits where space constraints are extreme (larger than micro‑WHR units)
No built‑in fuel‑oil firing – solely dependent on exhaust gas availability

Typical Vessels: Container shipBulk carrierCrude oil tankerProduct tankerCruise liner (auxiliary steam generation)

Decision Guide: Choose if you need a space‑efficient waste‑heat recovery unit for medium‑pressure steam with simple operation and natural circulation. Avoid if the vessel requires steam pressures above 65 bar, very high steam outputs, or prefers forced‑circulation designs to maximise heat transfer.

Use Cases: Installed on ships with medium‑speed diesel engines to recover exhaust heat for auxiliary boiler feedwater heating, cargo heating, or domestic steam generation. Commonly fitted during newbuilds of large tankers and container vessels where deck space is at a premium.

Manufacturer Datasheet

Datasheet

KBE

3-6 t/h steam · Exhaust Gas + Oil → Steam · Composite exhaust‑gas economizer

Medium

Exhaust Gas + Oil → Steam

Type

Composite EGE

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Service: Dual heat source — EG section operates at sea, oil section in port. Soot blowing critical. Water treatment essential.

Spare Parts: Aalborg Industries (Alfa Laval): Keep burner nozzle set, photocell and gaskets onboard. Lead time: 3–8 weeks for tubes.

Strengths

Dual heat source allows continuous steam generation at sea (exhaust gas) and in port (oil firing).
High steam output range (12.5–120 t/h) covers most auxiliary needs of tankers and bulk carriers.
Compact D‑type water‑tube construction with membrane walls provides good thermal efficiency and low refractory mass.
Integrated BOG (boil‑off gas) management for LNG/LPG carriers reduces fuel loss.
Design pressure options (9 bar or 18 bar) give flexibility for different vessel power systems.

Weaknesses

Complex control system for switching between exhaust‑gas and oil firing requires skilled operators.
Soot buildup in the economizer tubes demands regular soot‑blowing and thorough water treatment.
Tube bundle corrosion or pitting can lead to leaks; inspection and hydrostatic testing are intensive.
Higher capital cost compared with single‑fuel fire‑tube boilers.
Space requirements for the dual‑source arrangement may be limiting on smaller vessels.

Typical Vessels: Crude Oil TankerProduct TankerLNG/LPG Carrier (BOG recovery)Bulk CarrierContainer Ship

Certifications: ABSDNV GLLRUSCG Type Approval

Decision Guide: Choose the KBE when a vessel needs high auxiliary steam, wants to recover energy from exhaust gases, and operates with both BOG or oil fuel (e.g., tankers, LNG carriers). Avoid it on ships with low steam demand, limited crew expertise, or where space and budget constraints favor simpler fire‑tube boilers.

Use Cases: Main‑engine auxiliary boiler on tankers for cargo heating and deck washing, BOG recovery on LNG/LPG carriers, port fuel‑oil heating on bulk carriers, secondary boiler on container ships to supplement steam during high‑load periods.

Manufacturer Datasheet

Datasheet

Alfa Laval Aalborg OC-TCi 0100

100 kW thermal

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Thermal output (kW)

100

Heating surface m2

Pressure (bar)

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Manufacturer Datasheet

Datasheet

Alfa Laval Aalborg OC-TCi 0200

200 kW thermal

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Thermal output (kW)

200

Heating surface m2

Pressure (bar)

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Manufacturer Datasheet

Datasheet

Alfa Laval Aalborg OC-TCi 0500

500 kW thermal

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Thermal output (kW)

500

Heating surface m2

Pressure (bar)

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Manufacturer Datasheet

Datasheet

Alfa Laval Aalborg OC-TCi 1000

1000 kW thermal

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Thermal output (kW)

1000

Heating surface m2

Pressure (bar)

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Manufacturer Datasheet

Datasheet

Alfa Laval Aalborg OC-TCi 1500

1500 kW thermal

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Thermal output (kW)

1500

Heating surface m2

140

Pressure (bar)

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Manufacturer Datasheet

Datasheet

Alfa Laval Aalborg OS-TCi 0200

200 kW thermal

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Thermal output (kW)

200

Heating surface m2

Pressure (bar)

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Manufacturer Datasheet

Datasheet

Alfa Laval Aalborg OS-TCi 0500

500 kW thermal

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Thermal output (kW)

500

Heating surface m2

Pressure (bar)

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Manufacturer Datasheet

Datasheet

Alfa Laval Aalborg OS-TCi 1000

1000 kW thermal

Boiler Type

Alfa Laval Aalborg Ölgefeuerte Schiffsdampfkessel (Water Tube / D-Type)

Thermal output (kW)

1000

Heating surface m2

100

Pressure (bar)

Technical Specifications

Dampfkapazität OL: 12.500–55.000 kg/h (mit BOG-Management)
Dampfkapazität D: 25–120 t/h (Tanker-Hauptkessel)
Designdrücke: 9 or 18 bar(g)
Konstruktion: Zweritrommel (Dampftrommel/Wassertrommel), Membranwände, Generatorröhrenbank
Rohrsystem: Gerade Pin-Tubes mit Schwenk-Pins, externe Fallrohre (Aalborg D)
Brenner-typ: Oelgefeuert (Standard), Dual-Fuel optional, KBSD/Aalborg-Brenner
Refraktär: Minimal im Feuerraum, Isolations- + Formrefraktär an Rohrplatte

Product Lines

Aalborg OL (12.5-55 t/h, 9/18 bar)
Aalborg D (25-120 t/h, 18 bar, Tanker-Design)
Aalborg OM (8-45 t/h, Mittelkapazität)
Mission OS (bis 6 t/h, Vertical Auxiliary)

Common Failures & Inspection Points

Area: Tube body leakage due to corrosion, pitting, deposits (scale/sludge) or wear
Check: Internal visual inspection of all steam/water tubes; perform pressure test if suspected; seal leaking tube with conical stop valve after steel wire brush cleaning of tube ends. Leaking tubes must be renewed.
Area: Water level regulation: failure of differential pressure transmitter or feedwater control valve leads to flooding/drying out
Check: Check DP transmitter unit (external reference/variable leg, 4–20 mA output); feedwater control valve functional test; sight glass for cracks, contamination; test alarm function in control unit
Area: Safety valve failure or incorrect opening/closing pressures — overpressure or inadequate emergency steam relief
Check: Test two safety valves under full-load steam: pressure build-up 7 min. max. +6% working pressure permissible (water tubes); pop-point of each valve max. ±3% from set pressure; class notation: perform opening + accumulation test under classifier supervision
Area: Furnace refractory damage (cracks, spalling) or soot/corrosion → heat leaks, furnace instability, drum overheating
Check: Inspect furnace walls and refractory lining visually (min. 2x/year); check for cracks, moisture, soot deposits. Check lower tube plate (insulation + form refractory). After 3–4 weeks operation: perform blow-down, inspect/clean boiler, remove sludge
Area: Loss of pressure integrity due to corrosion, cracks, rivets or welds → leakage, operating loss, safety risk
Check: Hydrostatic test: fill boiler with water 21–65 °C (water tubes max. 71 °C). Pressure: 1.5× MAWP (non-entry) or 1.25× MAWP (entry). Secure safety valves with clamps. Check all seal surfaces, rivets, welds for leaks. Class notation: every 2 years (up to 8 years), then annually
Area: Internal corrosion (water side), scale deposits or fire side soot/flocking → tube wear, heat loss, contamination
Check: Class survey: water side (steam drum, water drum, all tubes) check for corrosion/cracks/deposits; fire side (furnace, flue gas path) check for soot/flocking (min. 2x/year). Man holes (top/bottom) permit access. If necessary use ultrasonic/endoscope for deeper defects

Type-universal inspection points for Alfa Laval Aalborg oil-fired marine steam boiler (Water Tube / D-Type) (Aalborg + Class/eCFR, 2026-06). Per-model specs not auto-populated.

Manufacturer Datasheet

Datasheet

Kangrim

KGE-200

1200 kg/h steam · Exhaust gas / Steam · exhaust gas economizer

Common Failures & Inspection Points

Soot fire risk
Fin tube erosion
Bypass damper malfunction

Service: Monitor exhaust gas temp differential; soot-blow every watch.

Spare Parts: Kangrim: Keep burner nozzle set, photocell and gaskets on board. Lead time: 3–8 weeks for pipes.

Strengths

High thermal recovery efficiency compared with conventional seawater‑cooled boilers
Compact footprint suitable for vessels with limited space
Direct integration with existing steam generation systems
Reduces fuel consumption by offsetting auxiliary boiler load

Weaknesses

Soot fire risk if exhaust gas temperature differential is not closely monitored
Fin‑tube erosion in high‑velocity or high‑sulphur exhaust streams
Bypass damper can malfunction, leading to pressure and flow instability
Requires routine soot‑blowing each watch, increasing crew workload

Typical Vessels: TankerBulk CarrierContainer ShipGeneral Cargo Vessel

Decision Guide: Choose the KGE-200 when a vessel needs efficient waste‑heat recovery, has space constraints, and can maintain continuous exhaust temperature monitoring and regular soot‑blowing. Avoid it on ships where crew cannot guarantee daily soot‑blow cycles or where high sulphur fuel leads to accelerated fin‑tube erosion.

Use Cases: Installed in the exhaust line of large marine diesel engines to supply steam for cargo heating, fuel treatment, and auxiliary boiler feedwater, especially on long‑haul tankers and bulk carriers seeking fuel savings through heat recovery.

Datasheet

KEH Series

2-10 t/h steam · Exhaust Gas → Steam · Finned tube Exhaust Gas Economizer

Medium

Exhaust Gas → Steam

Type

Finned Tube EGE

Common Failures & Inspection Points

Soot accumulation and fire risk
Tube erosion
Casing cracking from thermal stress

Service: Common on HHI/DSME/SHI-built vessels. Same soot fire prevention as Aalborg. Annual tube thickness measurement.

Spare Parts: Kangrim: Keep burner nozzle set, photocell and gaskets on board. Lead time: 3–8 weeks for pipes.

Strengths

High heat recovery efficiency, delivering measurable fuel savings
Compact finned‑tube design reduces installation footprint
Proven on HHI, DSME and SHI newbuilds, giving a solid service record
Compatible with low‑sulfur fuels and exhaust gas cleaning systems
Modular casing allows relatively easy inspection and tube replacement

Weaknesses

Soot buildup risk; requires strict fire‑prevention procedures similar to Aalborg units
Tube erosion accelerated by high sulfur or particulate content in exhaust gases
Casing can develop thermal‑stress cracks if temperature gradients are not well managed
Maintenance intensive: annual tube thickness measurements and periodic cleaning required
Less tolerant of wide exhaust gas temperature swings compared with some HRSG designs

Typical Vessels: Container ShipTanker (VLCC, ULCC)Bulk Carrier

Decision Guide: Choose if you need a compact, high‑efficiency heat recovery solution on large new‑build tankers or container ships and can commit to regular soot removal and tube inspection. Avoid if your vessel operates with highly variable exhaust temperatures, uses very dirty fuel, or cannot accommodate the required maintenance schedule.

Use Cases: Typically installed on large ocean‑going vessels such as VLCCs, ULCCs, Panamax/Post‑Panamax container ships, and bulk carriers built by Korean shipyards to supply steam for cargo heating, fuel pre‑heating, or auxiliary boilers.

Datasheet

Kangrim KRE-100 unverified

100 kW thermal

Boiler Type

exhaust_gas_economizer

Thermal output (kW)

100

Heating surface m2

Common Failures & Inspection Points

Heat-source or burner failure caused by fuel, ignition, exhaust-flow or control faults, noticed as failed start, trip or reduced heat production
Low or unstable water/fluid circulation caused by pump, level-control or valve faults, noticed as alarms, local overheating or loss of output
Heating-surface fouling caused by soot, scale or deposits, noticed as reduced efficiency, higher exhaust temperature or increased pressure drop
Tube, coil or pressure-part leakage caused by corrosion, erosion, scale or thermal stress, noticed as water/fluid loss, steam leakage or contamination of the gas side
Safety/control instrumentation failure caused by sensor, valve, actuator or interlock faults, noticed as unstable operation, nuisance trips or failed functional tests

Service: Inspect pressure parts or heater coils, heat-source/burner and refractory where applicable, gas-side cleanliness, circulation/feed systems and water or thermal-fluid condition. Verify level, pressure, temperature, flow, safety valves and shutdown/interlock functions applicable to the design. Review treatment, blowdown, soot-cleaning and operating records and use manufacturer/class procedures for pressure tests.

Spare Parts: Carry approved gaskets, valve service parts, relevant pump seals/bearings, temperature/pressure/level sensors and heat-source-specific spares such as burner ignition/flame components or soot-cleaning parts. Pressure-part repair materials should only be used under approved manufacturer and class procedures.

Use Cases: Used on merchant, tanker, offshore and passenger vessels for steam or thermal heating, including fuel/cargo heating, domestic services and waste-heat recovery.

Datasheet

Kangrim KRE-300 unverified

300 kW thermal

Boiler Type

exhaust_gas_economizer

Thermal output (kW)

300

Heating surface m2

Common Failures & Inspection Points

Heat-source or burner failure caused by fuel, ignition, exhaust-flow or control faults, noticed as failed start, trip or reduced heat production
Low or unstable water/fluid circulation caused by pump, level-control or valve faults, noticed as alarms, local overheating or loss of output
Heating-surface fouling caused by soot, scale or deposits, noticed as reduced efficiency, higher exhaust temperature or increased pressure drop
Tube, coil or pressure-part leakage caused by corrosion, erosion, scale or thermal stress, noticed as water/fluid loss, steam leakage or contamination of the gas side
Safety/control instrumentation failure caused by sensor, valve, actuator or interlock faults, noticed as unstable operation, nuisance trips or failed functional tests

Use Cases: Used on merchant, tanker, offshore and passenger vessels for steam or thermal heating, including fuel/cargo heating, domestic services and waste-heat recovery.

Datasheet

Kangrim KRE-500 unverified

500 kW thermal

Boiler Type

exhaust_gas_economizer

Thermal output (kW)

500

Heating surface m2

Common Failures & Inspection Points

Heat-source or burner failure caused by fuel, ignition, exhaust-flow or control faults, noticed as failed start, trip or reduced heat production
Low or unstable water/fluid circulation caused by pump, level-control or valve faults, noticed as alarms, local overheating or loss of output
Heating-surface fouling caused by soot, scale or deposits, noticed as reduced efficiency, higher exhaust temperature or increased pressure drop
Tube, coil or pressure-part leakage caused by corrosion, erosion, scale or thermal stress, noticed as water/fluid loss, steam leakage or contamination of the gas side
Safety/control instrumentation failure caused by sensor, valve, actuator or interlock faults, noticed as unstable operation, nuisance trips or failed functional tests

Use Cases: Used on merchant, tanker, offshore and passenger vessels for steam or thermal heating, including fuel/cargo heating, domestic services and waste-heat recovery.

Datasheet

Kangrim KRE-1000 unverified

1000 kW thermal

Boiler Type

exhaust_gas_economizer

Thermal output (kW)

1000

Heating surface m2

Common Failures & Inspection Points

Heat-source or burner failure caused by fuel, ignition, exhaust-flow or control faults, noticed as failed start, trip or reduced heat production
Low or unstable water/fluid circulation caused by pump, level-control or valve faults, noticed as alarms, local overheating or loss of output
Heating-surface fouling caused by soot, scale or deposits, noticed as reduced efficiency, higher exhaust temperature or increased pressure drop
Tube, coil or pressure-part leakage caused by corrosion, erosion, scale or thermal stress, noticed as water/fluid loss, steam leakage or contamination of the gas side
Safety/control instrumentation failure caused by sensor, valve, actuator or interlock faults, noticed as unstable operation, nuisance trips or failed functional tests

Use Cases: Used on merchant, tanker, offshore and passenger vessels for steam or thermal heating, including fuel/cargo heating, domestic services and waste-heat recovery.

Datasheet

Aalborg

AV-6N

1500 kg/h steam · Exhaust gas / Steam · exhaust gas economizer

Common Failures & Inspection Points

Soot fire (most dangerous!)
Tube leakage from corrosion
Soot accumulation
Water hammer

Service: CRITICAL: soot-blow regularly; never let water level drop below minimum.

Spare Parts: Aalborg: Keep burner nozzle set, photocell and gaskets on board. Lead time: 3–8 weeks for pipes.

Strengths

High thermal efficiency (≈80% of exhaust heat recovered)
Compact footprint suitable for space‑constrained vessels
Integrated automatic soot‑blowing reduces fire risk when maintained properly
Robust steel tube construction tolerates high soot loads
Compatible with medium‑speed diesel engines across a wide power range

Weaknesses

Requires strict water‑level monitoring; low level can cause overheating
Soot accumulation can lead to fires if blow schedule is missed
Tube corrosion possible in acidic condensate environments, demanding regular inspection
Water hammer incidents reported if sudden flow changes occur
Higher capital cost compared with simple economizers lacking soot‑blow systems

Typical Vessels: TankerBulk CarrierContainer ShipGeneral Cargo VesselRo‑Ro / Ferry

Certifications: DNVABSIMO D-2

Decision Guide: Choose if: you need high exhaust heat recovery on a medium‑speed diesel engine, have limited boiler room space, and can commit to regular soot‑blow maintenance. Avoid if: water‑level control cannot be guaranteed, the vessel operates with very low‑temperature exhaust (insufficient for efficient heat capture), or budget constraints preclude the higher upfront cost.

Use Cases: The AV-6N is typically installed on tankers and bulk carriers to supply steam for fuel heating, cargo heating, and auxiliary boilers, improving overall plant efficiency while meeting class requirements for emissions control. It is also used on container ships where space savings are critical.

Datasheet

Usui

UVG-300

1000 kg/h steam · Exhaust gas / Steam · Marine exhaust gas economizer

Common Failures & Inspection Points

Soot fire
Tube fin damage
Condensation corrosion at low load

Service: Japanese manufacturer; avoid prolonged low-load operation.

Spare Parts: Usui: Burner nozzle set, photocell and seals to be kept on board. Lead time: 3–8 weeks for tubes.

Strengths

High heat recovery efficiency (up to ~90% of available exhaust heat)
Compact footprint suitable for retrofits on existing vessels
Robust Japanese manufacturing quality with proven long‑term reliability at steady loads
Quick start‑up and integration with low‑speed diesel engine exhaust systems

Weaknesses

Susceptible to condensation corrosion when operated at prolonged low loads
Risk of soot fire if exhaust filtration is inadequate
Tube fin damage can occur under fluctuating load conditions, requiring regular inspection
Maintenance intensity increases with frequent start‑stop cycles

Typical Vessels: Product TankerBulk CarrierContainer ShipGeneral Cargo Vessel

Decision Guide: Choose if the vessel runs at medium to high load (>70% rated power) for extended periods and seeks fuel savings and CO₂ emission reductions. Avoid if the ship frequently operates at low load, has highly variable engine speeds, or lacks adequate exhaust gas cleaning systems.

Use Cases: Installed downstream of a main diesel engine to preheat feedwater for the boiler plant, the UVG-300 is used on newbuilds and retrofits to meet IMO fuel‑efficiency targets, reduce bunker consumption, and support compliance with emission control area (ECA) regulations.

Datasheet