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Hello Antoine. I prefer the '' welded pipe'' design but have seen the
''threaded hole'' design and both seem to work fine. I am using 3/4 inch
stainless nipples welded into the hull, with a ball valve on the inside, and
compression fittings leading to the inside manifold or outside ballast
tanks.
My thought is that the fewer connections, the lower the risk of
leakage.
Depending on the anticipated depth, the nipples can be sized to withstand
whatever pressure you have.
A schedule 80 fitting can take lots of pressure, and should it be necessary
later to replace it, it can either be re-threaded or cut out and replaced quite
easily and cheaply, versus a female thread assembly which would be a little
harder to fix. Frank D. Start the year off right. Easy ways to stay in shape in the new year. |