Re: Load Testing Seacocks
I followed the link but I don't get the point of your test. The ABCY picture you posted is of a flanged seacock. The test you did is on a thru-hull with a ball valve. It didn't meet the requirements of a flanged seacock in any way, it didn't even look like the reference picture. So the fact that it didn't meet the strength specification, in bronze or in Marelon is no surprise. Nor is is it an indictment of either product you tested. They both performed as one would expect. The discussion of thread mating was just a further distraction that had nothing to do with the topic at hand.
The only conclusion, and it didn't require your test, is that a boat equipped with a thruhull fitting and an attached ball valve below the waterline can't meet the ABCY rating unless it uses flanged seacocks as defined and required. So boat manufacturers should stop falsely representing their product as meeting ABCY requirements, or risk facing the full fury of our legal system. I know lots of lawyers happy to school them in it!
Gary H. Lucas