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23/07/03 14:51:33Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1234[5]678910 ]
Subject: Re: T500 Keel bolts


Author:
Brad
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Date Posted: 13/03/05 9:48:05
In reply to: Nicholas Hill 's message, "Re: T500 Keel bolts" on 13/03/05 1:00:56

Hi Nicholas

were they not originally stainless then, do you know why and when they were replaced?

I found an interesting article suggesting that the bolts have a margin for safety of around 40:1 but more concerning was this bit of info I found.

"Stainless keel bolts have one more drawback—the most significant one. Stainless steel loses its resistance to corrosion when immersed in stagnant seawater. Because of this, it is an inappropriate material for underwater fittings. It is used for keel bolts based on the optimism that the bolts will remain dry. If they do, the bolts are good for half a century. If they don’t, life expectancy can drop to half a decade. In seawater, stainless steel is subject to pitting, a particularly virulent form of corrosion that literally destroys the metal from within".

The life expectation is 30 years for stainless in lead and 15 years for stainless in cast iron, bronze beats both by a long way.

Brad

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Replies:
Subject Author Date
Re: T500 Keel boltsFrank Marsden13/03/05 18:25:40


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