Tests and sea trials are carried out as relevant for the various class notations according to the classification request and the scope of work agreed with the yard.
- Bollard pull (BOL)
Bollard Pull forcing test verification.
Additional test and trial service.
- Cargo securing load (CSL)
Cargo Securing Load measurements at sea for establishing appropriate lashing guidelines.
Additional test and trial service.
- Hot spot detection (HSD)
Hot Spot Detection survey to identify any hot surfaces that can start a fire in the engine room.
Additional test and trial service.
Additional test and trial service.
- Hull girder modes (HGM)
Hull Securing Modes identification by full scale monitoring including wave height recording to identify harmonic vibrations due to loads at sea.
Additional test and trial service.
- Hydro-acoustics noise (HAN)
Prediction and measurements of the Hydro-Acoustics Noise radiated from the hull and propellers are carried out for seismic, fishing, research and military vessels.
Additional test and trial service.
- Measurements of rotating machinery (MCM)
For ships in service, vibration Measurements of Rotating Machinery may be offered as a pre-docking service or as a part of predictive maintance. Failure conditions may be detected and possible causes described. In additon to standard measuring equipment, an expert program may be utilised.
Additional test and trial service.
- Noise and vibration (NVA)
Noise and Vibration response is measured during sea trials for verification purposes in accordance with agreed criteria (Comfort Class, ISO, NMD etc.).
For newbuildings or ships in service experiencing noise or vibration problems, DNV may offer a troubleshooting service. In addition to experience within a wide range of such problems, DNV has advanced measuring and data processing equipment used in analysing complicated noise and vibration problems.
For newbuildings or ships in service experiencing noise or vibration problems, DNV may offer a troubleshooting service. In addition to experience within a wide range of such problems, DNV has advanced measuring and data processing equipment used in analysing complicated noise and vibration problems.
Additional test and trial service.
- Shaft alignment calculations (SHAFT)
Early stage alignment calculations are important to avoid damage to bearings and shaft.
Additional test and trial service.