Severe continuous application with little or no
engine load/speed variations. Displacement hull.
b Engine average load factor: 80% to 100%
b Annual duration of use: more than 5,000 hours
b Use under full load: unlimited
Application examples: trawlers, deep-sea vessels, shrimp
boats, high sea or river tug boats, towboats, cargo ships,
dredgers, LCTs, ferries.
Continuous application with frequent variations
in engine speed and load. Displacement or semi-
displacement hull.
b Engine average load factor: 30% to 80%
b Annual duration of use: 3,000 to 5,000 hours.
b Use under full load: 8 hours in a 12-hour period.
Application examples: passenger vessels, port tugs, self-
propellers, coasters, yachts and cruising sailboats, fast
shing boats such as tuna boats, seiners, pot vessels or
liners, buoying vessels, oceanographic research vessels.
Intermittent application with signicant variations in
engine speed and load. Planing or semi-planing hull.
b Engine average load factor: 50%
b Cruising speed y 90% of the engine nominal speed.
b Annual duration of use: 1,000 to 3,000 hours.
b Use under full load: 2 hours in a 12-hour period.
Application examples: seasonal passenger vessels, shing
launches, pilot boats, commercial pleasure boats, pump
boats, displacement sailboats, trawlers, bow thrusters.
Light application with signicant variations in
engine speed and load. Planing hull.
b Engine average load factor: 30 %
b Cruising speed y 80% of the engine nominal speed
b Annual duration of use: less than 1,000 hours
b Use under full load: 1 hour in a 12-hour period.
Application examples: private pleasure craft, fast vessels
for sea rescue or surveillance, multi-hull pleasure craft.
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