Author Topic: Rust Pattern on Bows  (Read 4003 times)

Offline Heinu Sch

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Rust Pattern on Bows
« on: May 11, 2012, 12:51:42 PM »
Hello,

I have noted several ships that a certain pattern, made of what I assume is rust.

Here is an example:
http://www.shipspotting.com/gallery/fullscreen.php?lid=465107

What causes these marks to form and why in a stripe-like pattern? On the photos it looks like the paint around these marks are undamaged.

Can anyone shed some light on this phenomena?

Kind Regards
Heinu

Offline Jon Godsell

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Re: Rust Pattern on Bows
« Reply #1 on: May 11, 2012, 01:15:49 PM »
This caused by a tugs towing wire, when tight, scraping across the hull as it moves from one side of the vessel to the other.

Scouse.

Offline polsteam

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Re: Rust Pattern on Bows
« Reply #2 on: May 11, 2012, 08:09:05 PM »
In this particular case, and judging from what the pattern itself looks like, it was rather chain, not wire.

This is Rotterdam, wihout active machinery, towed significant distance to another repair yard converting it into floating hotel.

It is quite common practice that a towing line (wire rope) is attached not directly to the ship, but through intermediary chain (usually in configuration, where two chains run from both sides of the bow of the ship and they meet where the wire rope starts or there is a short piece of chain running from the point, where these two pieces meet, and then the end of this short piece of chain is attached to wire rope).
despite using "polsteam" for my nick I have NO personal (professional) or business connections with the company of the same name

Offline Heinu Sch

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Re: Rust Pattern on Bows
« Reply #3 on: May 15, 2012, 10:48:34 AM »
Thank you for the answers!

Based on your answers, I have one more question:

Why are the patterns in lines and not two long 'smudges' of rust either side of the bow? Surely the chain/wire scratched a bigger area the just where the lines patterns are.

Regards,
Heinu

Offline Peter Karberg

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Re: Rust Pattern on Bows
« Reply #4 on: May 15, 2012, 12:35:28 PM »
On most ships the pattern is caused at anchorage when a ship over rides the anchor causing the chain to drag across the stem or bulbous bow.

On your example Rotterdam it appears to be caused by a chain rubbing against the stem but too high to be the anchor chain.

Regards

Peter

 

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