How would you report to the Engineer Superintendent, by e-mail, the inspections, findings and repair suggestions for a significant rise in fuel consumption after dry-docking?

flowchart TD
  A["Higher fuel consumption after dry-docking"] --> B["Baseline: shaft power, RPM, speed and SFOC against pre-dock figures, corrected"]
  B --> C{"Where is the cause?"}
  C -->|External| D["Hull coating roughness, propeller condition and refit, trim"]
  C -->|Internal| E["Indicator cards, injectors, fuel-pump timing and VIT, turbochargers, air coolers"]
  D --> F["In-water hull cleaning, propeller polishing, yard guarantee claim"]
  E --> G["Overhaul injectors, correct timing, water-wash turbochargers, clean coolers"]

• A dry-docking should reduce hull resistance, so a rise points to a dock defect or a coincident engine problem.
• First correct the baseline for draught, trim, weather, current and the fuel’s calorific value. A lower-CV bunker alone can raise consumption.
• External causes: a rough or poorly applied coating, early re-fouling, or a rough, damaged or wrongly refitted propeller.
• Internal causes: low or uneven Pmax and Pcomp, worn injectors, wrong timing or VIT, fouled turbochargers or air coolers.
• Also check the fuel-flow-meter calibration and the fuel treatment.
• Engine faults are corrected on board. Hull and propeller issues are raised with the yard under the docking guarantee.