Posted by Brian Guptil (sailordude@…>)
Freedom Lovers
Just another opinion!
Like most things
vented loops and closing thru-hulls underway are gray areas. Some close everything
and have paid the price, while others have left open and also paid the price.
It very much “DEPENDS” on who you are, how well you maintain your
boat, and the conditions under which you are sailing.
All of the
Freedoms that I have owned, have shower sumps. As such, there is lots of
time to catch the situation and remedy it well before water hits the
bilge. Now if your are leaving the boat, it may make sense to close the
valves, but a friend lost an engine for that reason when the anchor drug and
the people started the engine to move the boat to safer water, so there is one
example.
Anti-siphon on
the intake makes no sense to me at all. Unless the line from the pump to
the bowl is lengthened and brought up to deck lever, where the siphon brake is
installed, otherwise there is only a matter of inches improvement since the
bowl itself is open to the atmosphere. But that is just me.
Anti-siphon on the “direct discharge” line makes sense, at the top
of a very high loop. Otherwise I would leave them out.
I have modified
all of my boats so that the head discharge goes directly to the holding
tank. The tank discharge line has a “T” with the upper to the
deck pump-out and the lower to a pump and then overboard. On Cayenne, the holding tank is above the water line so no pump is necessary.
Thus the thru-hull is always closed, unless you are actually in the act of
pumping overboard. Since the tank itself is vented, there is no need for
the preverbal vent loop.
Brian
Guptil
sailordude@…
1735 112th Ave.
N.E.
www.brigup.com
Bellevue, WA,
98004-3706 206-818-3203
-----Original Message-----
From: lance_ryley
[mailto:lance_ryley@…]
Sent: Tuesday, March 22, 2005 8:59 AM
To:
freedomyachts2003@yahoogroups.com
Subject: [freedomyachts2003] Re:
Vented loops in sanitary system
It’s my general practice to cruise with only the
essentials open
(like the raw water engine intake and the galley
sink drain) - in
fact, I’ve gone to using a dollop of fresh water
from the head
faucet rather than raw salt anyway because it
really cuts down on
the odors. I was just curious about this from an
overall perspective.
Thanks for the info.
Lance
— In freedomyachts2003@yahoogroups.com,
“Dave_Benjamin”
<dave_benjamin@y…> wrote:
Lance,
Never trust those valves in your head. The
best thing to do is
keep
the intake thru-hull closed while underway. I
know of boats that
have
taken substantial amounts of water down below
as a result of a
thru-
hull left open. Same goes for a sink drain
not located on the
centerline. If the boat is heeled for period
of time water can
slosh
in.
— In freedomyachts2003@yahoogroups.com,
“lance_ryley”
<lance_ryley@y…> wrote:
Is it necessary to have a vented loop in
the intake line? even
if
you run with the head intake seacock
open, aren’t you fairly
well
protected by the valve on the head?
I’m curious because on my F40, there’s
essentially a straight
shot
from the intake to the head, then a straight
shot from head to
diverter valve. From the diverter to the
holding tank is
straight,
but from the diverter to overboard is a
vented loop.
Lance
— In
freedomyachts2003@yahoogroups.com, “macks011”
<macks04@o…>
wrote:
Your system includes the head
overboard discharge option. For
optimum utility (no possible back
siphon) you need three
vented
loops. First, the flush water
intake line, located between the
flush
water pump and the bowl discharge.
Second, The direct over
board
discharge line between the diverter
valve and the the
discharge
thruhull and third, between the
macerator pump discharge and
the
discharge thruhull. You are trying
to prevent the possibility
of
back siphoning in any line open to
the sea,So all such lines
need
to
be vented. Thats how it was on my
Mull 36
If you are not going to use the
direct overboard discharge
option,
you can remove the diverter valve,
run direct to the holding
tank,
change your macerator pump to a
Sealand diaphragm type pump
and
eliminate all the vented loops in
the waste system completely.
By
eliminating high loops, you
eliminate standing sewage and the
possibility of leaks and odors.
Also, if you only pump into
the
holding tank, the through hull is
closed ALL the time EXCEPT
for
pump out.
If you are interested, I have
schematics and pictures of my
sanitation rebuild.
– In
freedomyachts2003@yahoogroups.com, Nan Shellabarger
<nshellab2@e…> wrote:
I’m redoing all the sanitary
hoses in my F28 sloop (Mull,
hull
#9). I was surprised to see that
the only vented loop in the
system
was in the overboard discharge line
- AFTER the diverter
valve.
Every reference diagram I’ve
looked at shows a vented loop in
the
water intake line (on mine the
intake line goes right to the
head
with no vent), and then the
diagrams show another vent BEFORE
the
diverter valve. I sail in the
Chesapeake so I’ll almost always
be
using the holding tank so in
the current set-up there is no
loop
at
all.
How are other F28 or F30s set
up?
How vulnerable am I without a
vented loop in the system?
\