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Mitsubishi

MAC-B Series (MAC-20B through MAC-110B)

Mitsubishi MAC-B Series (MAC-20B through MAC-110B) — Auxiliary steam generation for COPT-driven systems and inert gas applications on tankers, containerships, bulk carriers.

Components & Design

Component data being added…

Technical Data

Type Two-drum water-tube
Design Pressure 17.7 bar (1.77 MPa)
Evaporation Capacity 20-110 t/h (designation number = capacity)
Thermal Efficiency 80.5-82.5%
Fuel Types HFO (Heavy Fuel Oil), MGO (Marine Gas Oil), LSHFO (Low Sulfur Heavy Fuel Oil)
Fuel Burner Variable/configurable options with high efficiency
Production History Since 1983; 2,275+ units installed

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Common failures & inspection points

External examination of boiler casing, seams, and structural integrity

Visual inspection for cracks, corrosion, deformation, and water leakage; verify water-wall tube condition and tube thickness

Exhaust gas economizer condition and tube integrity (for composite/exhaust gas boilers)

Direct visual examination of headers and tubes; remote viewing (endoscope), Ultrasonic Testing (UT), or hydraulic pressure testing if visual access not possible; inspect supports, rolling stays, and uptakes

Safety valves, pressure relief devices, and protective system functionality

Annual safety valve testing; pressure gauge calibration; verify lift pressure and flow capacity; test protective devices including flame failure safeguards and fuel shutoff systems

Furnace refractory condition and combustion chamber integrity (oil-fired models)

Visual inspection of refractory lining for cracks, erosion, or spalling; verify burner alignment and flame pattern; check for soot accumulation and corrosion on combustion chamber walls

Fuel system and burner condition (oil-fired and multi-fuel models)

Inspect fuel filters and strainers for contamination; verify fuel pump operation and pressure; check atomizer condition; test fuel heater thermostat and temperature control; inspect fuel piping for leaks and corrosion

Type-general inspection and maintenance points for this equipment category — not model-specific.

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Equipment Model #147506 · ✓ still in production