Mission Series (Composite Boiler)

Take oil samples and check acid number (TAN), viscosity, colour; check temperature exceedances in dataset; monitor electronic controllers for setpoint drift (±1°C target exceeded = oil degradation risk)

Visually inspect coils through removable cover for coating, fly ash, corrosion spots; perform differential pressure measurement inlet/outlet (elevated pressure = contamination); measure tube diameter ultrasonic wall thickness if suspected

Visual inspection of furnace inner walls for cracks in refractory brickwork, particularly front/burner area; check quarls and air registers for slagging/scale; cracks with dark closure (not closed during operation) must be repaired

Visually inspect burner condition (mounted/swingable); observe flame shape (stable, no soot discharge); check nozzle holes for contamination; excessive soot deposits opposite burner indicate need for adjustment

Perform hydropneumatic pressure test after maintenance (no stress >90% yield strength); coordinate inspection progress & certificate with classification society (DNV, ABS, LR); accumulator test on new installation (pressure build-up <10% nominal value during 15-min continuous operation)

Safety valves must open at max. 3% above operating pressure, settle at 5% below operating pressure; annual inspections required; perform water level indicator blowdown to verify correct water level indication; minimum 2 independent water level measuring instruments required (SOLAS)