Emissions Management & Auditing for Tankers
28 September, 2010Satoru Ueno
TFMS Seminar in London 2010
CONTENTS
- Virtual Arrival + Oceanrouteing Service.
- Enhancement / Challenges with Optimum Ship Routeing Service.
- And further advantages for Tankers.
TFMS Seminar in London 2010
1,597.19(Feb 2009 - Jul 2010)
69.44
Virtual Arrival + Oceanrouteing saved
Outputs
mt / voyagemt / 23 voyage
(1) Decision of Virtual Arrival
Voyage Charterer authorizes Owner (Operator) + WNI with;(a) Full speed / consumption(b) Eco speed / consumption
Simulate ETA / Consumption with;(a) Full speed / consumption (b) Eco speed / consumption
with route recommendation.
Charterer WNI
(2) Slow steaming to destination
Voyage Charterer updates, if needed, Owner (Operator) + WNI with;(a) ETA
Oceanrouteing update with;- Route recommendation- Weather / sea / currents
Charterer WNI
(3) Post Voyage Evaluation
(a) Demurrage payment
(b) Split saved bunker (and Carbon) between Owner and Charterer.
Calculation of Audit Report on;
(a) ETA at full speed(b) Consumption at full
speed and saved bunker
Charterer WNI
1. Voyage Planning (Before Voyage) (a) Calculation Algorithm of Speed Reduction & Consumption(b) Speed and Consumption figures
2. En route performance monitoring (En route)Speed, RPM, Consumption, ETA monitoring vs weather/currents.
3. Evaluation / Auditing (Post Voyage) (a) ETA and Consumption calculation based on OSR (b) If no full speed periods, if no ECO speed periods. (c) Cargo heating in Virtual Arrival?(d) Virtual Arrival vs Charter Party compliance.(e) Consumption Audit - Warranted vs unwarranted.
2. Enhancement / Challenges
Enhanced method: OSR engine
ETA / Consumption taking into account;
- Varying RPM / Performance
- Varying Consumption
in accordance with ship behavior in weather / sea conditions expected.
Conventional method
Simulate ETA / Consumption at; - Constant RPM - Constant Fuel Consumption
(a) Calculation Algorithm
Enhanced method
Speed and Consumption figures can be calculated backward based on target (revised) ETA taking into account expected weather/sea conditions and ship performance analyzed.
Conventional method
Speed and Consumption are given by Charterer to WNI.
(b) Speed & Consumption figures
2. En route Monitoring
65
70
75
5
10
15
0
2
4
6
10/24 10/29 11/3 11/8 11/13 11/18 11/23 11/28
Wave Height [m]
Speed [kno
ts]
RPM
Heavy Conditions
Speed reducedas RPM reduced
Monitoring RPM, Speed, Weather during voyage
(a) ETA and Consumption calculation based on OSR (b) If no full speed periods, if no ECO speed periods.
3. Post Voyage Evaluation
5
10
15
20
80 85 90 95 100 105 110
Ship Spe
ed [kno
ts]
RPM
Basing ship performance Speed and Consumption based on RPM-based Performance Model (OSR engine) with historical data.
◇Wave Height < 2[m], Long.Wind > 0 [knots]
◇ 2[m] < Wave Height < 3[m] ,‐10 [knots] < Long.Wind < 0 [knots]
◇Wave Height > 3[m] , Long.Wind < ‐10 [knots]
Suggestion
(c) How Cargo Heating should be taken into account in Virtual Arrival evaluation?
• Daily cargo heating consumption constant throughout voyage?
• Extrapolating actual daily average cargo heating consumption during FULL speed to entire voyage?
(d) Virtual Arrival vs Charter Party compliance
WNI suggested Speed & Consumption figures to meet (revised) ETA maintaining constant and low RPM for fuel saving.
"Ordered Speed &
Consumption"
WNI monitor them real-time.
vs
(e) Consumption - Warranted vs Unwarranted.
Daily BROB
Daily consumption includes warranted and unwarranted
Warranted Others
Consumption Breakdown needed!
LActual track
Recommended Routeallowing 10.4 hours earlier arrival
To Avoid Missing Lay/Can
The vessel (using no Oceanrouteing service) missed Lay/Can due to heavy weather. 10.4 hours earlier arrival could have been possible if Oceanrouteing service had been applied.
An additional cost of one trip time charter vessel was incurred in order to make up for the delay. However, it was later revealed that the vessel would have missed it, even by navigating at her full speed with Oceanrouteing service.
L
Missing Lay/Can
Time chartered vessel to make up
To Avoid Missing Laytime
Recommended RPM and route to realize the least FO consumption meeting the RTA (Required Time of Arrival). Alternate RPM/routes compared with expected weather/sea conditions.
Calculated Total FOC
(MT)
RPM
(RPM of Main Engine)
RTA (Required Time of Arrival)
Eco
EcoSSS
Max15 kts
21
RPM
SPEED
WAVE
CURRENT
WIND FOC
Jeddah to Singapore
RPM rangeMAX 88
Eco 61
SSS MAX 48
SSS MIN 40
Multiple stage RPM suggestion based on operator's procedural requirements