You showed him the plans, got a quote, are now doing it
yourself , and your asking him for free advice???

Could be he's hoping your boat sinks, no?

SBV


Hinewai wrote in message
...


After a long break, back to usenet.

Have you ever been told something by an "expert", but
you're not sure
if what they say is right? The thoughts of my peers would
be
appreciated.

About to do a bit of plumbing on "Hinewai" and was
chatting over a
beer to the chap who does loads of plumbing work on the
boats in our
marina. He charges like a wounded bull, hence the chat
over a beer
and doing it myself.

We've just cut a new through-hull which feeds a three way
manifold.

Manifold Exit 1 will go to a sea water foot pump for the
sink - the
tap will be not that far above waterline. Sink empys into
a grey
water sump tank (below waterline) which is then pumped
overboard via a
high loop, joining the exhaust out pipe just before it
comes out
though the transom. The loop in the lazerette is unvented
since it's
not connected to any below waterline water-in thingy.

Manifold Exit 2 will go to the heat exchange pump on the
new Isotherm
Refrigeration

Manifold Exit 3 will go to the watermaker.

The thru hul is, of course, valved - each manifold outlet
will have a
manual valve.

Once the water's done its stuff with the fridge and
watermaker, the
waste pipes will both link, below waterline, into grey
water out
system on the output side of the sump tank and pump - back
flow will
be stopped by either a non-return or/and a manual valve.
The pumps
for both fridge and watermaker have enough balls to get
the waste past
the loop in the lazerette.

My plan was to put vented loops on:

1. The output side of the foot pump

2. The output side of fridge pump

3. The output side of the boost pump to the watermaker
serious pump.

Then, at least, should we lose any pipe work on the output
side of the
(below waterline) pumps, we wouldn't sink. I can't see
any time
manifold outlets 1 & 3 would be open when we are not
aboard, but we
might be sleeping. There will certainly be times I can
see that the
fridge will be running when we're on-shore.

My question to "the plumber' was whether I should consider
a vented
loop on the output side of the main watermaker pump - not
in the high
pressure bit, but in the brine waste. While the O tubes
are above
waterline, the output pipe dips below waterline to marry
into the grey
water output.

His advice was not to bother with vented loops for the
sink and
watermaker if we'd be there when those valves are open.
In some ways
that makes sense (but.. zzzzz), but I was blown away when
he said I
didn't need any vented loops at all with any of these
pipeworks as
long as I double clipped all joints and put a vent on the
lazerette
loop. He's seen the planned set up when he quoted me for
the job, but
that seems like a crock of sh*t to me.

I'd welcome your thoughts (although still mean to put
vented loops in
as planned). Any thought's on the brine side of the
watermaker? I
must admit I can't see any need to vent the loop in the
lazerette, but
maybe I'm totally confused over this whole issue.

Thanks

Peter

Ocean Odyssey
Australia
www.oceanodyssey.net

"Do not measure your life by the number of breaths you
take,
Rather by the number of times life just takes your breath
away"