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Ship construction - Vessel launching process

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That little girl in pink jacket is my sweat daughter Emily
https://www.youtube.com/watch?v=spVSv3VelOA

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under progress

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Production
A lot of time is spend on reading materials on welding.
GA sketch is in then end drawn by hand in order to define section plan though main power plant is not yet configured.
Production manufaturing is decribed where yard layout and POSlist shall be referred to together.
Midship section is refined according to new design.

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Similar or not?
Due to short of data on vessel displacement, a delay is caused on finding a simlary vessel for seagoing tug to determine the requied power on the main engines. Suitable azipods thrusters are to be figured out.

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Ship construction - work preparation and manufacturing

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Ship construction - slipway assembly sequence

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Capture propullsion configuration and load balance

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use HTS handleiding

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Can be improved

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Room of improvement

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Understanding Seagoing Tug and revision of design

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Understanding Seagoing Tug and revision of design

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To be able to give input to PIAS loading module, standard loading conditions are defined in Chapter 5.2. PIAS loading module is then explored and Intact stability is checked. Results are address in Chapter 5.3. It is understood that in this phase of study only basic intact stability requirements will be explored, so that other conditions relating to free surface effect, weather critieron, ice allowance, towing heeling moment etc. are out of the scope of study.

It is however concluded that the tug boat is very stable and will not topple even at maximum allowable heeling angle of 85 degree. But it is hard to say what will happen when towing deduced heeling moment is also introduced.
Besides, it is possible to consider to reduce the beam of the vessel, detailes see Chapter 5.3. This is noted as attension point in the coming period of time.

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When the main dimensions are defined,  a rough hydrostatic analysis is done on excel sheet to elaborate the main dimensions, displacement and deadweight.

Afterwards, three times lines plan are input to PIAS Hulldef module due to the following reasons:

Original lines plan is input (Week 1)

Lines plan is scaled according to 1st Design  (Week 2)

Lines plan are scaled according to adjusted main dimensions of 2nd design (Week 3).

Quite some hours are spent on the determination of the VCG of the tug. The hull shell and bottom steel weight is referred to the first design which is scaled up to the new dimensions. Remaining hull weight including coating, insulation, accommodation, etc. as well as the equipment weight and COG are estimated based on reference vessel data, main equipment supplier’s data and previous project experience being a design and cost estimation engineer. Results are shown in Chapter 5.2.

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It is realized that before the adaption of the design, the following questions are raised which need to be investigated to give directions and necessary input for adaption of main particulars.

1. The length of the tug from the original design is 75m, which seems fairly longer than normal tug boats. Therefore some reference vessels shall be investigated to deepen the understanding.

2. Is it a normal practice of tugs to pull the assisted large size offshore vessels in ice area?

3. Further investigate reference vessels of sea going tugs with ice class on the following aspects:

propulsion systems are used: engine power, engine types, main and auxiliary engines

propellers and bollard pull, speed

fuel storage and endurance

deadweight and GT

POB and autonomy

usage of ballast water

4. Based on above investigation to determine the new main dimensions and characteristics of the Tug. This will be the base to determine or estimate input to PIAS stability analysis.

The investigations and findings are address in Chapter 3.1 and resulting adaption of the main particulars and GA are described in Chapter 3.2 and Chapter 3.3. GA will be drawn later on in parallel to PIAS stability analysis.

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On the website www.tumblr.com an account is made on Week 1 and the first message is put there for a test. The intention is to use the blog as a diary of the new design iteration following the defined Work Plan.
However, Padlet can also be used to put the messages directly herein.

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Work plan

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Remarks of first design