[Public-List] seacocks

[Roger L. Kingsland]

J,

I certainly was interested when you mentioned an article on seacocks, but
when you also mentioned fiber orientation and lamination defects; wow, were
talking goose bumps at this end of cyber space!  Seriously, thanks for
keeping us up to date.  I need seacocks and can now do a better job of it.

All the best,

Roger

PS - does anyone know the sell price of the A30 that was on eBay.  It had
sold before I logged on (for that matter, is there any way to research sold
items on eBay)    


Roger Kingsland, Managing Partner
Kingsland Scott Bauer Associates

 

KSBA 
________________________________

Architects/Planners/InteriorDesigners/ProjectManagers
 
3441 Butler Street
Pittsburgh, PA 15201
N 40° 27.8344'  W79° 57.9831'
 
412-252-1500 ext.101 
412-779-5101 cell 
412-252-1510 fax
r.kingsland at ksba.com
www.ksba.com

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of J Bergquist
Sent: Monday, July 28, 2008 12:01 PM
To: Alberg 30 Public List -- open to all
Subject: [Public-List] seacocks

There is a really great article about seacocks in the current issue of
Professional Boatbuilder magazine. You can find a digital copy of the
magazine (for free!) at:

http://www.proboat-digital.com/proboat/20080809/

I thought I knew something about seacocks. What I learned by reading this
article is that all of the seacocks in my boat are improper, which made me
think 2 things:

1. I should probably change them before too long.

2. They have lasted a long time as is. So maybe it's not the first thing
that I should do, and it does seem like it would be quite a job.

I am sure many folks reading this list already know the proper seacock
installation ABYC specification, but it was news to me so I assume there are
others out there who also didn't realize it. Basically, what I learned is
that bronze thru-hulls have straight NPS (not NPT) threads on them, which
means if you screw a standard ball valve (which normally has NPT threads),
only a few threads will register before you hit the taper. In reality, thru
hulls are supposed to be screwed into a seacock that has matching NPS
threads from the outside. The seacock gets pre-installed with lag screws so
that it is fixed and you use a special wrench to turn the thru-hull into the
seacock itself from outside the boat. This process is illustrated and
explained in the article.

Anyway, what I have is standard ball valves with NPT threads screwed onto
the ends of my thru-hulls. This is basically exactly wrong. I had no idea.
Apparently it is a common mistake made by do-it-yourselfers and even some
professionals. I thought my installations were correct because they were
ball valves instead of gate valves. But the proper ABYC-compliant
installation should have actual seacocks lag screwed to the backing block
and with the thru hull threaded all the way in from the outside.

I just thought there might be other folks out there who would find this
article interesting.

There is also a sweet article about fiber orientation and lamination defects
which is pretty cool.

Later,

J Bergquist
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