The ABYC standards you're talking about are about through hull fittings. Bronze through hull fittings to hose to PVC is perfectly acceptable – there is no lateral loading on the manifold. PVC meets all the specifications for piping in boats except for through hull fittings. It is resistant to corrosion (actually immune), it has a temperature rating of 140 degrees continuous use at 120 psi. True, it's not the 300 or 600 WOG that bronze is, but if you can depend on the hose below the water line, you can depend on the PVC as it's ratings are the same or higher than the hose.
That's all I have to say about that.
Bob
On Mon, Sep 15, 2008 at 8:43 AM, John Stevenson < ([email][/email])> wrote:
I built my manifold pretty much as you have done. When I discovered the problem with the brass parts I rebuilt it mostly in bronze. The only non-bronze components are the close nipples that connect the T fittings. These are nylon. Since they are short and thick and are mostly inside the bronze T's I think it is more than strong enough. I haven't looked the ABYC standards nor have I had a marine surveyor approve it. Of course two surveyors approved my old manifold that nearly disintegrated in less than 5 years.
So maybe you don't need to completely start over.
On Mon, Sep 15, 2008 at 11:03 AM, Silver Heels < ([email][/email])> wrote:
Using PVC below the waterline is not my personal preference. Also, I may need to get this past an insurance
surveyor. I'm still looking at options. Nobody seems to make seawater manifolds in any form & size I can use.
Stainless steel pipe fittings become awfully expensive for this, bronze is worse, and I don't think there are
ball valves available in either material. You could probably stand on schedule 80 PVC pipe and not break it,
but I'm not clear on what is meant by “stand on it sideways against the hull.”
Later today I'll get a quote from my welder to custom-fabricate something in stainless for me.
Tor
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Silver Heels, P-424 #17
http://www.SilverHeels.us
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