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Sorry for the rich text of the previous post
> 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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