Lew and All, Nipples (and pipe) are available in Red Brass, which is the same as Gunmetal, which is Bronze.
I have no idea why the cast fittings are called bronze, while the pipe is called red brass. Brass has a definite yellow cast while bronze has a wonderful warm reddish glow. The blades of my CP propeller, made by Hundested Motor and Propeller Fabrik in Denmark for North Sea fishing vessels, are made of gunmetal, AKA red brass. Quoted from Wikipedia: Gunmetal is a type of bronze an alloy of copper, tin, and zinc.[1] Originally used chiefly for making guns, gunmetal was superseded by steel. It is called red brass in America.[2] Gunmetal is resistant to corrosion from steam and salt water, and is thus suitable for valves, pump parts and steam fittings. Gunmetals produced for different purposes vary slightly in composition. In some cases, the alloy may be composed only from copper and tin, or from copper, tin, and lead. It has many uses in industry, and is used for statues and various small objects, e.g. buttons. U.S. Government bronze specification G is a gunmetal composed of 88% copper, 10% tin, and 2% zinc. U.S. Government bronze specification H is composed of 83% copper, 14% tin, 3% zinc, and 0.8% phosphorus. Norm S/V Bandersnatch Lying Julington Creek FL 30 07.72N 081 38.4W > [Original Message] > From: Lew Hodgett <[EMAIL PROTECTED]> > To: <[email protected]> > Date: 4/30/2008 6:08:02 PM > Subject: Re: [Liveaboard] Through hull fittings-Update > > "Lee Haefele" wrote: > > > I had a 1.5" through hull fitting break off in my hand. It was > > pink/orange and granular at the fresh break. Is this electrolysis > > and will all of the through hulls be equally bad? None are > > grounded, boat was built 12/99. How could I test the others? If I > > file a corner off, will the odd color show? > > Got to thinking about Norm's comment and Lee's comment about bronze > fittings. > > You can buy bronze pipe fittings, elbows, tees, couplings. > > You can NOT buy bronze pipe such as nipples, only BRASS. > > Brass and seawater are not compatible. > > Seawater will leach out the zinc leaving a honeycombed structure that > will crumble in your hand. > > Marelon (glass filled PVC) or schedule 80 PVC are your non-metallic > choices, 316L (forget 304) if you want metallic. > > This is above and beyond possible electrolisis problems. > > Lew > > > > _______________________________________________ > Liveaboard mailing list > [email protected] > To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard > To subscribe send an email to [EMAIL PROTECTED] > > To unsubscribe send an email to [EMAIL PROTECTED] > The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ > > To search the archives http://www.mail-archive.com/[email protected] > > The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
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