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Workshop on regulations for anchor handlers

Posted on November 21, 2019

Different regulations are used for vessels with designation Anchor Handling:

  1. Norwegian Maritime Directorate (NMD) from 2007: Guidelines for immediate measures on supply ships and tugs that are used for anchor handling.
  2. Bureau Veritas (BV) amendments January 2014, Pt. D Ch. 14 Sec. 2 Reg. 5: Additional requirements for anchor handling vessels.
  3. Intact Stability Code (IS) 2020, part B, section 2.7.
  4. GL rules I-6, 2012 edition, Section 27 Anchor Handling and Towing Ships
  5. Other?

These rules, though sharing a similar purpose, prescribe different formulae for the forces and moments to be taken into account when assessing stability for anchor handling vessels. The results of these calculations can be expressed in tables of allowable anchor chain forces, or in a polar plot of maximum allowable anchor chain forces for a given loading condition.

SARC has implemented both polar plots of allowable anchor chain forces (for a given loading condition) and the tables of allowable anchor chain forces for the first 3 of the requirements listed above. Still, many questions are asked because results may sometimes conflict with users’ expectations. Additionally, some of these rules include some formulae of which the purpose and background are obscure.

Just as for other complex stability calculations, SARC will offer a workshop/training on the ins and outs of above rules.

The following subjects will be presented:

  • Overview of listed requirements:
    • Calculation of moments and forces included
    • Background of specific presumptions
    • Required input data
  • Procedural approach for:
    • Tables of allowable anchor chain forces
    • Polar plots of allowable anchor chain forces
  • Examples in PIAS and LOCOPIAS
  • How to verify of results (example).
  • Q&A

If you are interested, please contact SARC for further details. The first workshop is planned on December 13 2019, from 10:00 to 16:00 in Bussum, the Netherlands.

PIAS thread monitoring interface

Posted on October 28, 2019

To speed up time consuming calculations (more specific, parts of the probabilistic damage stability calculations), PIAS uses parallelization of the calculation process where possible. For example the generation of damage cases and the calculation of damage boundaries is multithreaded.

Multithreading in PIAS is available as dual-threading (up to 2 cores), Octo-threading (up to 8 cores) and will be available soon in Viginty-threading (up to 20 cores).

Up till now, the feedback of the application during the calculation progress was limited. To improve this feedback, PIAS has been extended with a thread monitoring interface, which gives detailed information on the status of the available, and working threads. A print screen of this interface is shown in the picture below.

New tool bar buttons in Fairway

Posted on October 22, 2019

A select set of frequently used functions in Fairway are now just one click away, directly accessible from the new tool bars. Tool bars in Fairway can be rearranged by dragging them to a different location around the drawing area, or floating anywhere on top of the drawing area. Individual tool bars can be hidden and shown by right-clicking on the tool bar area or from the [Window -> Tool Bars] menu. Users that prefer to activate functions using <Alt> key combinations instead may be interested to switch all tool bars off, which will give them a bigger drawing area.

New feature in Layout: weight and Centers of Gravity of planes

Posted on September 17, 2019

It will be well known that for the definition of spaces and compartments in PIAS, the ‘physical planes’ provide a very efficient modelling tool. Obviously, these planes will in practice be used to model bulkheads and decks.

Recently, the data storage of the physical planes has been enhanced to include a specific weight (which is the average weight of the plane in ton/m2). This is used in a new feature, labelled ‘Area table’, which includes for each plane its area, CoG and weight. At the end of the table total weight and CoG is listed.

Although this table provides only a rough approximation of the internal steel  hull weight, it is still a useful tool in the early design stage, because it is so tightly integrated with the design model of the internal geometry. At present, the shell weight is not included in this list, although the weight and CoG of the shell plates can be computed with the shell plate expansion function of Fairway.

IMDG amendment 39-18 update in LOCOPIAS

Posted on September 3, 2019

IMDG amendment 39-18 is now published, may be used from 1/1/2019 and becomes mandatory on 1/1/2020 when amdt 38-16 is no longer valid. The overview of changes has been published by Hazcheck:

Last year we released the IMDG module for the first time. Now SARC has integrated the IMDG Amendment 39-18 into the LOCOPIAS IMDG module. The updated module is available and ready to be delivered. If you would like to request the updated LOCOPIAS IMDG module (IMDG Amendment 39-18) now, please send us a message. 

Implementation of Intact Stability Code 2020 allowable anchor handling forces

Posted on August 27, 2019

IMO Intact Stability Code is in its 2020 version extended to include a section 2.7, “Ships engaged in anchor handling operations”.  These have now been added to the rule set of  PIAS’ Maxchain module, as well as in the polar plots of LOCOPIAS.

Polar plot of maximum allowable anchor chain force, according to intact Stability Code 2020

Computations without the Compart detour

Posted on August 19, 2019

Those who followed the newsletters of the past years will have noticed that PIAS has seriously been revised and modernized.

An important topic in this process has been the replacement of Compart with the Layout module. However, PIAS modules using compartment data were still based on the Compart data format, so Layout stored the compartment data both in native Layout format, as well as in Compart format. For the user this was invisible, so as such it was no real objection, but this duality obstructs further software developments. For this reason, all modules of PIAS have been adapted to native Layout format. This new software has been in use within SARC for some time, and has been intensively tested, so we consider it now to be the time for a general release. Actually, you will not see any change in operation of PIAS, although compart-related computations (such as damage stability) might occasionally give marginally different results with the new software. Please be assured that, thanks to the enhanced compartment definition method of Layout, differences — if they occur at all — will be in the direction of increased accuracy.

Compart has been removed from the set of PIAS modules. An act that we will perform with some melancholy because this piece of software has since 1985 served thousands of PIAS users with modelling and computations of an estimated million tanks, holds and spaces.

PIAS’ Probdam module updated with SOLAS 2020 requirements

Posted on June 13, 2019

On June 15, 2018 IMO adopted resolution MSC.421(98), titled “Amendments to the International Convention for the Safety of Life at Sea”. With respect to probabilistic damage stability, this encompasses:

  • A change of the required subdivision index for passenger vessels.
  • Changes in the formula for the probability of survival, applicable to damage cases that involve a ro-ro space.

PIAS module Probdam has been extended with these changes and is currently being tested. From July 1, 2019 this functionality is available for all users of Probdam.

Direct computation of tank volume during definition of tank geometry

Posted on April 23, 2019

When designing or defining a ship for some tanks or compartments target capacities apply. In those cases it will be convenient to have permanent feedback on the actual volume of a compartment. This feature is now available in PIAS’  Layout module.

New damage stability summary

Posted on March 27, 2019

The output of damage stability (summary) has been given a makeover and has become much shorter than before. This output can also be imported into Microsoft Word or Excel to edit it yourself. For each damage case it is now possible to see briefly and clearly whether this case is complies or not. The complete output has remained unchanged and everything can be found there down to the last detail.

Example of new summary output damage stability

Update October 2019:

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