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#1
posted to rec.boats.cruising
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Cooling water failure lesson
Here's something about cooling water intakes I learned the hard way
last year even though, somewhere in the recesses of my mind, I'm sure I knew better at the time. Http://Home.maine.rr.com/rlma/Strider0603.htm#cooling BTW there was quite a bit of discussion here about the Aqualarm when I was putting it in last year. My conclusion after a season of sailing is that it functions well as an alert to total stoppage but isn't much good, at least with small engines, at alerting you to reductions in flow. Ironically, my only cooling water system failure was caused by the alarm installation itself. At least it told me though Now that it's properly set up (or will be tomorrow) , I'm glad to have it on my boat. -- Roger Long |
#2
posted to rec.boats.cruising
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Cooling water failure lesson
It would be quite a job to relocate the raw water pump on my Yanmar
much lower I thought about running a line from after the pump over to the Aqualarm and back for just the reasons you cite but am reluctant to change a silver painted factory hose. No practical reason not to but it's the kind of thing that could be a hang up and haggling point with an unimaginitive insurance surveyor down the road. -- Roger Long |
#3
posted to rec.boats.cruising
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Cooling water failure lesson
Roger, the lesson you learned is wrong if you think the strainer should be
below the water line. You immediately lose the ability to clear blockages through the hull fitting. if you do. Any decent rubber impeller pump will suck 2 meters of head if the tips are kept wet by a post pump riser. Steve "Roger Long" wrote in message ... Here's something about cooling water intakes I learned the hard way last year even though, somewhere in the recesses of my mind, I'm sure I knew better at the time. Http://Home.maine.rr.com/rlma/Strider0603.htm#cooling BTW there was quite a bit of discussion here about the Aqualarm when I was putting it in last year. My conclusion after a season of sailing is that it functions well as an alert to total stoppage but isn't much good, at least with small engines, at alerting you to reductions in flow. Ironically, my only cooling water system failure was caused by the alarm installation itself. At least it told me though Now that it's properly set up (or will be tomorrow) , I'm glad to have it on my boat. -- Roger Long |
#4
posted to rec.boats.cruising
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Cooling water failure lesson
I didn't mean to imply that as a hard fast rule. Everything is very
close coupled on my boat. It was the fact of the airlock being very close to the pump so that the piping was still airbound when the pump started cavitating in air. Yes, the pump should be able to lift that far but you want an engine cooling system to still function event when the pump impeller is compromised by wear or air. Make everything as easy as possible for it. It's possible that I could have gotten the flow restored by going up to maximum RPM for a while but I started assuming blockage or impeller failure. It was a pretty exciting day and the implications of the big heel angles didn't sink in till later. The suction is pretty low. My seacock is right next to the strainer so I don't lose anything by keeping it all self priming and easy flowing. If your strainer has to be far from the seacock, then, by all means put it above the waterline. Just don't have it right next to the engine with a short hose running down from the strainer to the pump. -- Roger Long "Steve Lusardi" wrote in message ... Roger, the lesson you learned is wrong if you think the strainer should be below the water line. You immediately lose the ability to clear blockages through the hull fitting. if you do. Any decent rubber impeller pump will suck 2 meters of head if the tips are kept wet by a post pump riser. Steve "Roger Long" wrote in message ... Here's something about cooling water intakes I learned the hard way last year even though, somewhere in the recesses of my mind, I'm sure I knew better at the time. Http://Home.maine.rr.com/rlma/Strider0603.htm#cooling BTW there was quite a bit of discussion here about the Aqualarm when I was putting it in last year. My conclusion after a season of sailing is that it functions well as an alert to total stoppage but isn't much good, at least with small engines, at alerting you to reductions in flow. Ironically, my only cooling water system failure was caused by the alarm installation itself. At least it told me though Now that it's properly set up (or will be tomorrow) , I'm glad to have it on my boat. -- Roger Long |
#5
posted to rec.boats.cruising
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Cooling water failure lesson
You should also consider that, if your cooling system is blocked or
sucks air, your pump impeller will be quickly damaged. It may be capable of keeping your engine running but not tight enough to provide much suction lift spinning mostly in air. The more you try to get it working, the worse it's going to get. -- Roger Long "Roger Long" wrote in message ... I didn't mean to imply that as a hard fast rule. Everything is very close coupled on my boat. It was the fact of the airlock being very close to the pump so that the piping was still airbound when the pump started cavitating in air. Yes, the pump should be able to lift that far but you want an engine cooling system to still function event when the pump impeller is compromised by wear or air. Make everything as easy as possible for it. It's possible that I could have gotten the flow restored by going up to maximum RPM for a while but I started assuming blockage or impeller failure. It was a pretty exciting day and the implications of the big heel angles didn't sink in till later. The suction is pretty low. My seacock is right next to the strainer so I don't lose anything by keeping it all self priming and easy flowing. If your strainer has to be far from the seacock, then, by all means put it above the waterline. Just don't have it right next to the engine with a short hose running down from the strainer to the pump. -- Roger Long "Steve Lusardi" wrote in message ... Roger, the lesson you learned is wrong if you think the strainer should be below the water line. You immediately lose the ability to clear blockages through the hull fitting. if you do. Any decent rubber impeller pump will suck 2 meters of head if the tips are kept wet by a post pump riser. Steve "Roger Long" wrote in message ... Here's something about cooling water intakes I learned the hard way last year even though, somewhere in the recesses of my mind, I'm sure I knew better at the time. Http://Home.maine.rr.com/rlma/Strider0603.htm#cooling BTW there was quite a bit of discussion here about the Aqualarm when I was putting it in last year. My conclusion after a season of sailing is that it functions well as an alert to total stoppage but isn't much good, at least with small engines, at alerting you to reductions in flow. Ironically, my only cooling water system failure was caused by the alarm installation itself. At least it told me though Now that it's properly set up (or will be tomorrow) , I'm glad to have it on my boat. -- Roger Long |
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