How to remove Blakes seacocks

[burgundyben]

Obviously neither of us was specific, but I was referring to a 'true' bronze: i.e. a copper/tin alloy. You're certainly right that many so-called bronzes are nothing of the sort: many of our props, for instance, although their alloy has other desirable properties. Equally some pseudo-bronzes, such as silicon-bronze, are ideal for fasteners because of their high mechanical strength.

Of course DZR brass is a type of brass. That's why it's called 'DZR brass', the 'DZR' merely being a property, albeit once commonly used as shorthand. I wasn't trying to suggest that it isn't fit for purpose on underwater fittings, just that I think an appropriate true bronze is better. I think the clue is in the 'R': an 'I' (for 'immune' or something like it) would be more reassuring.

Would I fit DZR brass skin fittings? Yes, I would, although the next round of changes will be to composites.

Of course if Vyv differs, I'm all ears.

I think we're agreeing.

 

[Jokani]

After much blood sweat and tears, I finally removed both the seacocks.

In the process of grinding of the bolt heads from the outside,the bolts got smoking hot, enough to release the adhesive that was holding them in.

Upgraded to a 4lb hammer and a 15" wrecking bar, still no movement. A blow torch to the larger seacock released the adhesive and I was able to use the wrecking bar to pry that one up.

The smaller seacock, I heated with the blow torch, I couldn't get the wrecking bar underneath, but putting a small bar in to the seacock form the outside and whacking with the 4lb'er sorted that one.

What a battle, success at last.

Appreciate all the advice