Next message: graham pugh: "Re: T&T: Important - Attention All Foreign Flagged Cruising Craft"
> Robin> > read my posts.> > First of all, this is all conjecture, no one
knows why the boat sunk .... but this thread is based on the premise that it
was a bilge pump that syphoned.> > What I though I said was that there is no
reason for a large automatic pump (the larger the better?) under the situation
that was described (boat sunk at dock)> > If that boat had smaller pumps, with
smaller outlet hoses, the boat would have taken longer to sink, since we are
all assuming the water came through the discharge hose, into, then out of the
pump.> > On the sunken boat either the pump stopped working and water syphoned
in, or the pump cycled on and off until the batteries were dead. In both these
scenarios, the alarm in parallel with the pump would have run longer if the
pump was smaller.> > There is no use having a large pump if its large hose
syphons back. The larger the pump, the faster the bilge will fill back up.> >
If the pump had been small, and if in fact the problem was syphoning, the
water would have entered in a smaller stream, the pump would have worked less
often, since it would have taken longer for the bilge to fill up. The
batteries would have held up longer, but since the smaller pumps would take
longer to dry the bilge, the alarm would have run longer and disturbed more
neighbors.> > In fact if we take the idea of 'the smaller the better' to an
extreme, we might say that if he hadn't had any pump, the boat would not have
sunk at all.> > I have 7 pumps on my boat. Two small ones (automatic) in the
engine rooms. Four in the hull bilges and the engine room bilges (manually
operated switch) one Xlarge 'mother' that I can bring to any of the biges as
necessary.> > I am not saying boats should not have large pumps. I am saying
the automatic pumps should be small, because on an unattended boat, the larger
the pump, the faster it will sink (through syphoning .. which was the goal of
the thread)> > Peter> > > > From: > > To:
> > Date: Tue, 5 Feb 2008 15:01:00
-0500> > Subject: T&T: Disharge lines..pump size> >> > "..I think the idea of
a larger pump is DANGEROUS..."> >> > And yet you offer no evidence! Your list
of ideas is fine...but has nothing to> > justify the above claim.> >> > If you
imply that a dangerous "fix" to a leaky boat is bigger pumps, I might> > agree
just to be sociable, but even in that extreme situation it's not the> > pumps
that are making the situation dangerous.> >> > "I just exchanged my automatic
pumps for smaller ones.."> >> > ah, what a shame!!!...."they take less
current"..only because they pump less> > water so you have gained
nothing....but cut down on catastrophic dewatering> > capability.....but an
alarm, as discussed by others, is valuable regardless of> > the size pump...>
>> > Bigger is better!!> >> >> >
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