Ahmet,
There was no tube strapped to the suction hose. If we wanted to add an air
hose we could have used a air operated pump at the bottom of the hose.
The air hole in the pipe was small, perhaps a quarter inch. The pipe was
perhaps 1 1/2" diameter.
The diaphragm pumps "pulled" the water up in the hose and air entered the water
column lightening the water so eventually the water reached the deck 50 feet
above. The air injection was never zero or the water would not have risen more
than 30 feet.
The tanks were being cleaned by spraying hot seawater all over the insides so
the tanks were essentially empty. Most of the water had already been removed
using the stripping pumps.
The deck gang was pumping the last bits of water from the tanks so the portable
diaphragm pumps being used were not "high capacity pumps".
Norm
S/V Bandersnatch
Lying Julington Creek FL
N30 07.68 W081 38.47
----- Original Message -----
From: ahmet erkan
To: [email protected]
Sent: 1/25/2011 7:49:21 AM
Subject: Re: [Liveaboard] Thanks Bob, Ben, and Norm (diaphragm pumps)
Speculating the air injection should be high at the start and zero after the
suction
hose is fully primed. A tube strapped to the suction hose might allow the
priming and
then it could be plugged. One could even push compressed air into the tube to
super aerate the fluid and maximize the height. This should be convenient since
the
pump is air operated. Alternately a big check valve at the bottom might allow
the
suction hose to be primed with water from top?
I remember the P250 centrifigual pumps required an air tight suction hose to
operate
at full capacity without sucking air.
That brings the question; "air operated diaphragm pump"? I understand using
air or water to drive the pump in a flammable environment but why use a
diaphragm pump for a high capacity application? Maybe it wasn't "high" capacity?
Just curious.
Cheers.
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