...used to connect the Atlantic Ocean to the Gulf of Mexico.
Now once again, here's the founder and host of Ship Shape TV,
John Greviskis!
John: Thanks Buck!
We want to change the way
that our engine and generator
is getting cooling water
to each system.
Currently we have a sea chest,
and originally it was fine. Our engines were a little bit smaller.
In 1996, we re-powered.
Okay, and we have larger engines that consume more water.
And, we put in a new generator
that consumes more water and the sea chest is just outdated.
If something were to clog, everything gets shut down.
So what I want to do is I want to bring independent water supplies
to every unit. And that leads us to our next expert guest.
Hello Richard how are you?
Richard: Good to see you again.
John: This is Richard Cozier and Richard
is with Perko. And you guys
are bar none the experts in
underwater marine fixtures.
And I see that we've brought a nice assortment here.
For an independent water supply, to each engine
What do I need to install?
Richard: Basically there's two options
as far as how you want to bring the water into the system.
You have a ball valve and thru hull combination,
or you have a seacock and thru hull combination.
John: Okay I want to show everybody the thru hull.
And what a thru hull does is
it gives you the ability to bring raw water
from the outside of the boat, through the hull,
and then into the craft.
A ball valve, notice this handle right here, this gives us
the ability to shut off water.
Okay and I've seen a lot of boats today
use this combination.
But, it's not necessarily
the most prudent combination to use.
Tell me the advantages of a seacock
over a ball valve.
Richard: Basically a ball valve - once the
thru hull is installed into it,
it becomes a one single unit.
So if there was ever any sort of
force that were to damage the thru hull, the thru hull got
corroded or if you damage in the inside of the ball valve,
this item would break the seal
and you'd have water coming into the boat
and you'd have no way to turn the water off.
John: Even though it has a shut off handle,
okay - if that connection
gets compromised and if something were to hit it inside the boat,
okay - it could get compromised.
You could sink.
A seacock however does what?
Richard: Okay, a seacock, the main difference
between a ball valve and a seacock is this flange.
This flange is mounted
to a mounting block inside of the boat.
And once they're installed, they become
one unit in the boat.
And it allows for the thru hull
to be able to be seated in
and adjusted till it meets the bottom of the boat.
And if there is any compromise to the thru hull
you can physically turn this off,
unscrew the thru hull from under the water
and you have no water coming into the boat whatsoever.
John: I want to go that route,
but I want to talk about the threads
that are on a thru hull.
I know that there are straight cut threads,
I know that there are tapered threads.
Where do you use these different types of threads
in marine hardware?
Richard: Okay, a seacock
uses straight cut threads.
It allows for an object like a
thru hull, to be adjusted based on the distance,
or however it's going to travel into it,
to the distance of the bottom of the hull.
John: So a straight cut thread is for a adjustability.
Richard: With using pipe dope and/or teflon tape
you can create a watertight seal
but this seal is not as important
as a tapered thread
for something along the lines of a ball valve.
Now a tapered thread,
after the first several turns, it will lock up
and seize and it will create a watertight seal.
John: So a tapered thread will self seal.
Richard: Correct.
John: But we do recommend that you
would, even with the tapered thread
even though it's suppose to self seal.
Use some teflon tape in order to ensure a seal.
But the tapered thread is used for a ball valve install,
the straight cut thread is used for seacock install.
Richard: Correct. Now Perko's thru hulls -
we've created a combination thread.
Which the first several threads on our thru hulls are tapered
the balanced are all straight so it can work in multiple applications.
John: Alright I want to talk about scoops.
We need to have a way to strain out
seaweed or grasses
that might be found in the body of water
or around our boat. We don't want that entering
into our engines because that could clog them.
Okay, that could create an overheating situation.
Talk to me about this particular casting.
Richard: Okay, this is a scoop strainer.
It fits with a thru hull inside of it like this and it forces,
this is on the underneath of the boat at the hull of the boat.
John: And this faces forward as you're traveling forward. Richard: Correct.
Richard: It forces water into this direction
up your thru hull and into seacock or ball valve.
John: Okay, so it scoops it in,
and it forces it up. Richard: Correct.
John: Alright it also strains out
some of that garbage that might be in the water. Richard: Correct.
Richard: There's different types of strainers that have
the holes like this.
This is a better operation for being able to
strain versus this which is more of a water flow.
John: What are the baskets all about
that you've seen inside the crafts with the glass bowls?
Richard: We have here an example of one of our water strainers.
And basically the main difference with this
is this allows you a visual reference
to be able to see your water flow that's going.
If you have a back up that's happening and it's in your
basket, it's easy to change.
John: So you can clean out the debris that get
caught in this basket. Richard: Correct.
John: Okay, but more importantly you can see
the water flow going through this glass sphere, okay.
Coming to the engine, you can tell in essence
if your water pumps are still working.
John: Okay that is very, very cool!
Now if your temperature gauge goes up
and you don't have one of these, okay.
Chances are
your scoop has been clogged.
You're going to have to jump overboard and have to clear it.
Otherwise you're going to get into a real serious situation.
Richard, thank you so much for all the
information. We're going to go with seacock.
And we're going to show you step by step procedures
how to install one into your boat,
right after this!
Narrator: Don't pull up anchor!
Ship Shape TV will be right back!