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Krill
S y s t e m s
M/V Walla Walla
Fuel Savings Analysis
Krill
S y s t e m s
M/V Walla Walla
Krill
S y s t e m s
Typical Day
 22 Crossings
 30 Minutes
each way
 Speed over Ground
 Total Fuel Flow
Krill
S y s t e m s
Morning Routine
 Idling
7 minutes
5.1 Gallons
 Dock Pushing
32 minutes
40.1 Gallons
 Eliminate Morning Dock Pushing
40 Gal x 365 days x $3.90 =
$56,940
Krill
S y s t e m s
Jack Rabbit Starts
 Apply throttle gradually
1.5 Gal x 22 crossings x 365 days x
$3.90 = $46,975
 Half Speed Commanded
 Full Speed Commanded
Krill
S y s t e m s
Dock Pushing
 Dock Pushing
60 Shaft RPM
29 Gallons
 Dock Pushing
50 Shaft RPM
22 Gallons
 Reduce Shaft RPM while pushing
7 Gal x 22 crossings x 365 days x $3.90
= $219,220
Krill
S y s t e m s
Positive Restraint System
 Engine Off while Docked
29 Gal x 22 crossings x 365 days x
$3.90 = $908,193
 Payoff in 3-4 months
$500,000 Cost / $908,193 x 2 Ferries
Krill
S y s t e m s
Summary
 Eliminate morning dock pushing $56,940
 Reduce Jack Rabbit Starts $46,975
 Reduce Shaft RPM while Docked $201,220
Total $305,135 annually per boat
 With Positive Restraint System $ 1,012,108 annually per boat
 With Speed reductions and schedule adjustments, even more
savings are possible

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WSF Walla WAlla fuel saving strategy analysis.

  • 1. Krill S y s t e m s M/V Walla Walla Fuel Savings Analysis
  • 2. Krill S y s t e m s M/V Walla Walla
  • 3. Krill S y s t e m s Typical Day  22 Crossings  30 Minutes each way  Speed over Ground  Total Fuel Flow
  • 4. Krill S y s t e m s Morning Routine  Idling 7 minutes 5.1 Gallons  Dock Pushing 32 minutes 40.1 Gallons  Eliminate Morning Dock Pushing 40 Gal x 365 days x $3.90 = $56,940
  • 5. Krill S y s t e m s Jack Rabbit Starts  Apply throttle gradually 1.5 Gal x 22 crossings x 365 days x $3.90 = $46,975  Half Speed Commanded  Full Speed Commanded
  • 6. Krill S y s t e m s Dock Pushing  Dock Pushing 60 Shaft RPM 29 Gallons  Dock Pushing 50 Shaft RPM 22 Gallons  Reduce Shaft RPM while pushing 7 Gal x 22 crossings x 365 days x $3.90 = $219,220
  • 7. Krill S y s t e m s Positive Restraint System  Engine Off while Docked 29 Gal x 22 crossings x 365 days x $3.90 = $908,193  Payoff in 3-4 months $500,000 Cost / $908,193 x 2 Ferries
  • 8. Krill S y s t e m s Summary  Eliminate morning dock pushing $56,940  Reduce Jack Rabbit Starts $46,975  Reduce Shaft RPM while Docked $201,220 Total $305,135 annually per boat  With Positive Restraint System $ 1,012,108 annually per boat  With Speed reductions and schedule adjustments, even more savings are possible