SA/R Series Rating Definitions

Propulsion

Heavy Duty(HD)

Typical Operation:	Allowable Load Factor is less than 100% of Rated Power.
	Allowable Cruising Speed is less than 100% of Rated Speed.
	Operating hours is unlimited per year.
Typical Vessel Application:	Fishing Boats, Cargo Boats, Pusher Boats

Medium Duty(MD)

Typical Operation:	Allowable Load Factor is up to 83% of Rated Power.
	Allowable Cruising Speed is up to 94% of Rated Speed.
	100% of Rated Power is available intermittently for 8Hr per every 24Hr operation.
	Operating hours is less than 6000Hr per year.
Typical Vessel Application:	Bay Area Tug Boats, Working Boats, Passenger Boats, Ferry Boats

Light Duty(LD)

Typical Operation:	Allowable Load Factor is up to 75% of Rated Power.
	Allowable Cruising Speed is up to 91% of Rated Speed.
	100% of Rated Power is available intermittently for 1Hr per every 6Hr operation.
	Operating hours is less than 3000Hr per year.
Typical Vessel Application:	Pleasure Boats, Yachts, Patrol Boats, Fire Fighting Boats

Auxiliary and Generator Set

Prime - Limited Running Time

Definition:	Prime-Limited Running Time is applicable for supplying continuous power paralleled with the utility for the limited short-time period.
Typical Operation:	Allowable Average Load Factor for 24Hr is 100% of Rated Power.
	Over-Load of 110% can be used for less than 25Hr per year on emergency.
	Yearly Average Load Factor is less than 100%.
	Operating Hour is less than 500Hr per year.
Typical Application:	Seasonal Peak Cut, Stand-by Power Source

Prime - Unlimited Running Time

Definition:	Prime-Unlimited Running Time is applicable for supplying power with varying load instead of the utility for an unlimited time.
Typical Operation:	Allowable Average Load Factor for 24Hr is 80% of Rated Power.
	100% of Rated Power is available intermittently for 3Hr per every 24Hr operation.
	Over-Load of 110% can be used for less than 25Hr per year on emergency.
	Yearly Average Load Factor is less than 60%.
	Operating Hour is unlimited.
Typical Application:	Stand alone Power Source, Daily Peak Cut, Power Source for Construction

In some cases with special condition or application, engines will not comply with the definition above.

For more information, please contact your local MHI international offices.