T&T: Volvo Duty Ratings

[Dave Legrow]

Marine Commercial Ratings
RATING 1 (Heavy Duty Commercial)
For commercial vessels with displacement hulls in heavy operation.
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 displacement hulls in
cyclical operation. Full power could be utilized max 4 h per 12 h
operation period. Between full load operation periods, engine
speed should be reduced at least 10% from the obtained full load
engine speed.
RATING 3 (Light Duty Commercial)
(Light Duty Commercial) For commercial vessels or craft with high
demands on speed and acceleration, planing or semi-planing hulls
in cyclical operation. Full power could be utilized maximum 2 h per
12 h operation period. Between full load 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 craft in commercial operation. Recommended
speed at cruising = 25 knots. Full power could be utilized max 1h
per 12 operation period. Between full load operation periods,
engine speed should be reduced at least 10 % from the obtained
full load engine speed.
* RATING 5 This power is intendend for pleasure craft applications,
and can be used for high speed planing crafts in commercial
applications with special limited warranty, see warranty and service book.
 
The above taken from:
 
www.volvopenta.com
 
Dave Legrow