Daughter craft are small vessels that remain with the SOV during on-site activities and ferry personnel from the SOV to the site for maintenance. Unlike a CTV, a daughter craft does not return to port.
Add a daughter craft
Note: A daughter craft requires a mother vessel. Add an SOV to your case before you add a daughter craft.
- Open a Shoreline Design case.
- Click on the Build tab.
- Click on the Logistics tab.
- Click + Add.
- Click on the Daughter craft vessel tab.
- Select a vessel instance.
- Complete the required logistic information.
- Click Next.
- Edit the logistic inputs as required.
- Click Add.
Edit a daughter craft
Click on a daughter craft in your Design case to view and edit the inputs.
Daughter craft inputs
Logistic information
| Input | Description |
|---|---|
| Name | An easily identifiable name for the vessel. This is filled by default, but you can edit it as required. |
| Number of units to add | How many vessel instances you want to add to your case. |
| Port | The home base of the vessel. By default, this is the same as the mother vessel SOV's port. |
| Mother vessel | The SOV to which the craft is assigned. |
| Spot chartered | Enable lead time for the vessel. |
| Availability | Determine if the vessel is always available or only during shift hours. |
| Alter vessel settings | Select whether the shift time is constant or variable. By date and the settings will repeat annually: The vessel is only available within the period selected. Periodically and specify durations by number of days: Assign the number of days the vessel is available and unavailable. The pattern repeats for the duration of the simulation. |
| Wind farms | Check the wind farms the vessel services. |
Logistic inputs
Members
The Members tab displays a list of asset names and locations.
Click on an instance name in the list to edit the location.
Add additional instances by clicking + Add instances.
Parameters
These general parameters control high-level aspects of the logistic.
| Parameter | Required | Description |
|---|---|---|
| Charter length | Logistic availability period | |
| Countries | The countries in which the vessel operates. | |
| Crew size | Number of personnel required to operate the logistic. | |
| Remarks | Option comments related to the logistic. |
Capacity
These inputs determine how many personnel the logistic can carry.
| Parameter | Required | Description |
|---|---|---|
| Technician capacity | x | The number of seats available on the logistic for technicians. |
Performance
These inputs determine the vessel speed in different configurations as well as weight restrictions.
| Parameter | Required | Description |
|---|---|---|
| Cruising speed | x | Logistic speed at cruise. |
| Reliability | Currently not included when running the simulation, as it is only a visual representation. |
Weather criteria
Define operations and access limits based on weather conditions.
| Parameter | Required | Description |
|---|---|---|
| Significant wave height access limit | x | Maximum wave height at which the logistic can access an asset. Create a matrix for more detailed criteria. See the weather matrix page to learn more. |
| Wind speed access limit | x | The maximum wind speed at which a logistic can access a WTG or substation. |
| Wind speed limitation reference height | x | The height at which the Wind speed access limit applies. |
| Visibility access limit | Note: Construction only. The minimum visibility at which the logistic can access a WTG or substation. | |
| Lowest tide | Tidal limit for logistic operation. If you are using MSL data, the input must be negative; for LAT data, positive. |
Fuel consumption
There are a variety of inputs here for determining fuel consumption during different logistics configurations, such as when in transit, idle, and jacked up.
These inputs do not affect your simulation outputs and are only for your own reference.
Cost
Here, you can set a wide variety of costs related to the logistic, such as fuel, mobilization, and harbor fees. These are for your own reference and do not affect simulation outputs.
Enter an amount, currency unit, cost index, and year for any costs you are interested in tracking.
You can also create a time series to track costs at different rates cross different years. Click the Open Data Time Series (calendar) icon on the right side of a row, enter a year range, click Update, enter the cost for each year, and click Save.
Synchronize the currency across all costs by selecting a currency from the Synchronize cost currencies dropdown and clicking Change all currencies.
Activity durations
Configure the timings of key logistic activities. Enter an amount and a unit, either days (d), minutes (m), hours (h), or seconds (s). For example, 3m.
| Parameter | Required | Description |
|---|---|---|
| Lead time | The amount of time required to prepare the vessel for departure following a failure. | |
| Connection time | x | Time required to align and prepare access to asset upon arrival. |
| Disconnection time | x | Time required to disconnect and move away from the asset. |
| Personnel transfer time per technician | x | Time required for each person to access the asset from the vessel. |
| Equipment transfer time | x | Time between personnel accessing the asset and equipment being transferred/work commencing. |
| Mobilising time per port visit | x | Time required to prepare the logistic and board personnel before leaving port. |
| Demobilising time per port visit | x | Time required for the vessel to demobilize at port. |