§ 18
How many hours does the ship lie at the dock?
Answer: When a container ship arrives, the planner needs to know how long it stays at the quay so crew, cranes and next call can be planned. Dock time is time for the lifts plus the fixed time for mooring, lashing, paperwork and inspection. Lift time is number of lifts divided by the cranes' combined pace. Use your own net crane rate, i.e. lifts per crane-hour whilst the crane is working. The calculator works out the time itself and shows what an extra crane means.
Løftetid = løft ÷ (kraner × løft pr. kran-time)
Liggetid = løftetid + fast tid
Kran-timer = løft ÷ løft pr. kran-time (de timer, der skal bemandes på kranerne)
Eksempel: 1.200 løft ÷ (2 × 25) = 24 timer + 3 timer = 27 timer
| Symbol | Meaning | Unit |
|---|---|---|
| loeft | Total lifts (unloading + loading + shifting) | løft |
| kraner | Cranes on the ship | kraner |
| net_rate | Lift per crane-hour, net (your own measurement) | løft/time |
| fast_tid | Fixed time (moorage, lashing, paperwork) | timer |
| = | Dock time at quay | timer |
| = | Heraf loftetid | timer |
| = | Crane hours in total | timer |
| = | Dock time with one more crane | timer |
Does not apply when
The calculator's own default values inserted. The figures are calculated with exactly the formula the tool uses.
Substituted
Giver
Members only
Create a free user account to unlock all articles, calculators, templates and range — and get access to quizzes and classes. It takes less than a minute: name, email and a password. No payment card.
Want to try something first? See what you can use without an account — the junior zone, the encyclopedia, the videos and more.
Du bruger den, når et anløb skal planlægges: hvor mange kraner og hold skal der på, og hvornår er skibet færdigt. Den viser også, hvad en kran mere sparer.
Et feederskib skal have 1.200 løft. To kraner laver 25 løft pr. kran-time, og den faste tid er 3 timer.
It means: Skibet ligger 27 hours, heraf 24 hours løft. Der skal bemandes 48 hours på kranerne. Med en kran mere ligger det 19 hours.
Et skib skal have 3.400 løft med fire kraner à 28 løft pr. kran-time og 4 timers fast tid.
It means: Liggetiden er 34.4 hours. En femte kran giver 28.3 hours, hvis løftene kan fordeles.
1.000 løft med to kraner à 25 tager 20 timer.
Løftetid × kraner skal give kran-timer.