Actually, Xenos has a  macerator that has a thru hull valve for the reasons that Roger described. I don’t have valves on the seat drains as they are above the water line enough. The cockpit drain should have one but not enough room.
Chris Geankoplis
Enosis/Xenos

On Sat, Jan 8, 2022 at 2:27 PM ROGER PIHLAJA <roger_pihlaja at msn.com> wrote:

> Hi Graham,
>
> It would at least be the start of “a bad day on the water”!
>
> Roger Pihlaja
> S/V Dynamic Equilibrium
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
>
> From: Graham Stewart<mailto:gstewart8 at cogeco.ca>
> Sent: Saturday, January 8, 2022 1:28 PM
> To: 'The Rhodes 22 Email List'<mailto:rhodes22-list at rhodes22.org>
> Subject: Re: [Rhodes22-list] Rhodes 22 in St. Maarten
>
> Good advice Roger. Sinking at sea could ruin the whole day.
>
> Graham Stewart
> Agile, Rodes 22, 1976
> Kingston Ontario
>
>
>
>
>
> -----Original Message-----
> From: Rhodes22-list [mailto:rhodes22-list-bounces at rhodes22.org] On Behalf
> Of
> ROGER PIHLAJA
> Sent: Saturday, January 8, 2022 11:53 AM
> To: The Rhodes 22 Email List
> Subject: Re: [Rhodes22-list] Rhodes 22 in St. Maarten
>
> Hi Peter,
>
> If you check any reference on best principles and practices for thru hulls,
> they all specify a ¼ turn full port (i.e. no obstruction to flow when the
> valve is 100% open) shutoff valve at each thru hull.  Valves that meet this
> criteria include tapered plug petcocks and ball valves.  Most thru hulls
> use
> tapered plug petcocks because they are easier to service.  In my chemical
> engineering job, I had access to chrome plated 316L stainless steel ¼ turn
> ball valves with glass filled PTFE seals that never need any maintenance.
> I
> have 3 of these ball valves on S/V Dynamic Equilibrium, under the galley
> sink and 2 more in the lazarette compartment for the seat drains.  The only
> thru hull that doesn’t have a shutoff valve is the cockpit drain because it
> is so close coupled to the thru hull; that, there isn’t physical space for
> any sort of shutoff valve.  However, I keep a tapered wooden plug on board
> ready to pound into that thru hull if it should have an issue.
>
> The hose, the hose clamp (i.e. corrosion failure), and the hose barb on the
> thru hull itself are all potential failure points.  For example, suppose
> you
> are sailing on port tack and a sudden gust of wind causes a knock down.
> Something heavy in the cupboard slams into the hose or thru hull, rupturing
> it.  You are so busy trying to reduce sail, get the boat back upright, get
> the water out of the cockpit; that, by the time you notice, you already
> have
> water in the cabin over the cabin sole and rising fast.  Remember, the leak
> is hidden inside the cupboard, so you can’t see it.  The boat has already
> sunk on her lines enough to submerge the thru hull and you have no way to
> stop the flow.  You’re going down!  Except for the thru hull failure, I’ve
> actually experienced this scenario.  Anyone who sails on blue water needs
> to
> take stuff like this seriously.
>
> Roger Pihlaja
> S/V Dynamic Equilibrium
>
>
>
> Sent from Mail<
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>
> From: Peter Nyberg<mailto:peter at sunnybeeches.com>
> Sent: Friday, January 7, 2022 9:17 PM
> To: rhodes22-list at rhodes22.org<mailto:rhodes22-list at rhodes22.org>
> Subject: Re: [Rhodes22-list] Rhodes 22 in St. Maarten
>
> Roger,
>
> Could you please describe the scenario in which the failure of one of those
> hoses would cause the boat to founder quickly?  I'm not quite seeing it,
> and
> I'd guess that Dynamic Equilibrium is the only boat in the R22 fleet with a
> valve on that thru hull.
>
> BTW, I hope your recovery is going well.
>
> Peter Nyberg
> Coventry, CT
> s/v Silverheels (1988/2016)
>
> > On 2022-01-07, at 18:15:10 EST, ROGER PIHLAJA wrote:
> >
> > Hi Rob,
> >
> > You might want to install a real thru hull with a valve.  If one of those
> hoses
> > fail, you’re going down pretty quick!  It’s a pretty easy upgrade and
> definitely
> > cheap insurance.  It was one of the first things I changed on S/V Dynamic
> > Equilibrium after I bought the boat in 1987.
> >
> > Roger Pihlaja
> > S/V Dynamic Equilibrium
>
>