Attention

This module is an extension exclusive to the container module.

Note

For the implementation of the lashing results a software development kit from DNV called Stowlash is used, fully integrated in LOCOPIAS. The forces and accelerations are calculated according to the DNV compliance rules. The Stowlash 3D approach uses a 3D finite element calculation model, where each stack is treated separately without interaction.

Layout

The lashing "mode" can be activated by pressing the [Lash on/off] on the top right of the container module. You can switch off the lashing mode by clicking on the button again. When the button is pressed, you can click on a 20' or 40' bay on a hatch. Such a bay can be fully or partially filled, whether only by 20', 40' or a mix of both. When clicking on a loaded bay, you enter the lashing module window. A typical layout of the lashing module is shown below. Its elements are labeled with a number and described underneath.

1 Menu bar

Basic functionalities are accessible through the menu bar.

2 Module-buttons

This button navigates back to the [Container]-module.

3 Function buttons

Main functions of the Lashing module.

4 2D View

This is the main working window of the lashing module. All the functions happen through this window.

5 3D View

3D view of the selected baystack.

6 Results window

The acceleration results are shown here. You can double-click on a container to see them. They are automatically updated. If the accelerations do not comply, they will be highlighted in red.

General approach

The basic entity of the lashing module is the "baystack", which is a set of any one type of container, or a combination of types, depending on their positioning in the bay on a hatch. The accepted container types are:

• For length : 20', 23', 30', 35', 40', 43', 45', 48', 49', 53' or '2', 'B', '3', '4', 'H', 'L', 'M', 'N', 'P' first digit ISO code.
• For height : 8', 8'6'', 9', 9'6'' or '0', '1', '2', '3', '4', '5' second digit ISO code.

The 2D window 4 is for all the functions - make new lashing connections, remove existing ones, copy/paste, create or remove equalizing devices and so on. By default, the synchronized lashing front and aft is enabled. The synchronized side is completely identical to the mastering side for all the functions described below. Any action on one side is automatically applied to the other one. Synchronized lashing can be disabled in the Settings in 1. If synchronized lashing is disabled, you can easily switch through aft and fore view to work independently.

The forces and accelerations are calculated automatically after each function (new/remove/copy/paste) for every container and its lashing connections. You can view the results either in the [Output] in the menubar in 1 for all the containers in the baystack, or separately for each container by selecting it. The module has pre-programmed maximum values provided by DNV. These values cannot be modified. The only modifiable values are the safe working loads (SWL) for the castings and the twistlocks, which can be found in the Settings in 1.

If any the forces does not comply with the aforementioned limits, the container will be drawn red in the 3D view in 5. When the non-complying container is selected, then the results window 6 will highlight in red the exceeding values. The 2D window in 4 will show a few more details, as shown below:

• if a lashing force in a lashing device doesn't comply, the lashing connection will be red.
• if a lashing force on a casting doesn't comply, the casting will be red.
• if the racking force doesn't comply, a red arrow will be drawn pointing right for PS wind, left for SB wind or both ways for both cases.
• if the lifting force doesn't comply, a red arrow will be drawn pointing upwards.
  

  Non-compliance for racking and lashing forces.

Main functions

	Use this function to switch between front and aft view. The 3D window rotates accordingly. The current viewing side is the mastering side and is noted on the top left of the window 4.
	Use this function to create a new lash. Left-click and hold on or around a casting corner. The new lash will immediately appear connected to the closest lashing plate. You can move the mouse pointer to the desired lashing plate and then release left-click mouse button. The new lashing is now established.
	Use this function to delete an existing lashing connection. Hover over and highlight the candidate connection, then left-click to remove it.
	Use this function to create a new equalizing device. Move the cursor close to the desired connection plate and left-click to raise an equalizing device. Two new connection plates are now generated from a single plate, allowing for two lashings to be connect to a single point. The equalizing device will automatically rotate according to the lashing angles.
	Use this function to remove an existing equalizing device. Any lashings that are connected to it will be automatically removed.

Additional functions

Route specific reduction factors

The lashing module allows for route specific reduction factors of transverse accelerations for the calculations. The user can set a specific route, or a custom reduction factor in the [Settings] in 1.

Select

• You can select a lashing connection by left-clicking on or around the lashing's casting corner. The selected lashing will turn green.
• You can select a container and see its resulting forces and accelerations in 6 by clicking the left mouse button. The selected container will turn gray. If you want to deselect, click anywhere outside the baystack.

Edit lash properties

You can right-click on a selected lashing connection and select "Edit lash properties" in the Lashing options the menu. In this window you can choose any from the available lash types. You can also change its diameter or elastic (Young's) modulus. The length and the angle are automatically calculated and cannot be edited.

Copy/Paste lashing connection

You can right-click on a selected lashing connection and select "Copy lashing" in the Lashing options menu. This will create a copy of the selected lashing, mainly its orientation and properties. Then you can right-click on or around the new casting corner, right-click and select "Paste lashing" or "Paste mirrored". The new lashing connection will be adjusted to the paste selection. In case there are insufficient connection plates to complete the paste, a message will pop up.

Note

You only have to copy once. You can then paste (or paste mirrored) any number of times.

Output

There are two types of output :

• A list of all the lashing forces, together with checks for the transverse acceleration and stack weight and their verification can be generated through [Output]→[List of lashing forces].
• A lashing plan can be generated through [Output]→[Lashing plan]. It is an alternative to a lashing manual; there are no computation results, but the lashing patterns are clearly visible, with indications which lashing devices are to be used.

Blind frames

The lashing module allows for the use of blind frames as long as they are 1-tier high. More than that is not currently supported. Please see below examples of acceptable or not acceptable loads for the blind frames. If you encounter a scenario where the lashing module produces an error caused by the blind frames, you can try to evaluate the separate parts independently.