1. Continuous Duty (CON) or P1,    unrestricted Coutinuous with full load,  80%-100% load,  Running time from 5000 to7000 hours per year.
    Applied for Offshore anr river tug, Ro-Ro, Ferries, Barge, Cargo, Passenger vessel.including MCD

2. Heavy Duty (HD) or P2 , Continuous with load variations  8 hours out of 12 with full load, 30%-80% load, Running time from 3000-5000 hours per year.
   Applied for Harbour turboats, mid-water trawler.

3.  intermittent Duty (INT) or P3, intermittent use in variable load application.2 hours out of 12 with full load, 50% load, Running time from 1000-3000 hours         per year.
    Applied for Crew boat, police and Miliary vessel. charter motor yacht.

4.  High Output Duty (HO) or P4,   High performance with load variations,  1 hour out of 12 with full load, 30% load factor, less than 1000 hours per year.
   Applied for  Patrol boat, motoryacht, cruiser.

1.  Working cycle:  Two stoke marine diesel engine, and four stoke marine diesel engine
2.  Intake mode:   Natural intake engine, turbocharged or turbocharged aftercooled engine 
3. Speed:  Low speed engine (<500RPM)  medium speed engine (500-1500RPM) High speed engine (>1500RPM)
4.Arrangement:  In-line,  V type,
5. irreversible or reversible marine diesel engine 
6.  Rotationary,    Left engine and right engine. 
7. Fuel types,   light fuel oil,  Heavy fuel oil, LNG,  Doul fuel marine diesel engines.