Volvo Penta TAMD42 - Engine Application Ratings

9
Engine application ratings
The engines covered by this manual are mainly used
for five different operating conditions, Rating 1 – Rat-
ing 5, as described below.
Even at a very early stage, the output requirements
and operating conditions for the installation concerned
should be carefully specified so that a suitable engine
with the right setting and convenient equipment can be
ordered. This can avoid time concerning modifications
at a later stage.
Rating 1
Heavy duty commercial
For commercial vessels with displacement hulls in
heavy operation. Unlimited number of running hours
per year.
Typical boats: Bigger trawlers, ferries, freighters, tug-
boats, passenger vessels with longer journeys.
Load and speed could be constant, and full power can
be used without interruption.
Rating 2
Medium Duty Commercial
For commercial vessels with semiplaning or displace-
ment hulls in cyclical operation. Running hours less
than 3000 h per year.
Typical boats: Most patrol and pilot boats, coastal
fishing boats in cyclical operation, (gillnetters, purse
seiners, light trawlers), passenger boats and costal
freighters with short trips.
Full power could be utilised max 4 h per 12 h operation
period. Between full load operation periods, engine
speed should be reduced at least 10% from the ob-
tained full load engine speed.
Rating 3
Light Duty Commercial
For commercial boats with high demands on speed
and acceleration, planing or semiplaning hulls in cycli-
cal operation. Running hours less than 2000 h per
year.
Typical boats: Fast patrol, rescue, police, light fishing,
fast passenger and taxi boats etc.
Full power could be utilised maximum 2 h per 12 h op-
eration period.
Between full load operation periods, engine speed
should be reduced at least 10% from the obtained full
load engine speed.
Rating 4
Special Light Duty Commercial
For light planing crafts in commercial operation. Run-
ning hours less than 800 h per year.
Typical boats: High speed patrol, rescue, navy, and
special high speed fishing boats. Recommended
speed at cruising = 25 knots.
Full power could be utilised max 1 h per 12 h opera-
tion period. Between full load operation periods, en-
gine speed should be reduced at least 10% from the
obtained full load engine speed.
Rating 5
Pleasure Duty
For pleasure craft applications only, which presumes
operation by the owner for his/ her recreation. Running
hours less than 300 h per year.
Full power could be utilised maximum 1 h per 12 h op-
eration period.
Between full load operation periods, engine speed
should be reduced at least 10% from the obtained full
load engine speed.