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Old 20-11-2014, 14:36   #1
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Raw Water pump failure

I recently destroyed the water pump">raw water pump that services a Mase I S 11.2 generator. The drive engine is Yanmar 3TNV.
The problem was caused by a blocked raw water intake but was exacerbated because the auto overheating cutout activates well after the water stops. Hence , the pump is well ' cooked '.
The blockage was caused by a jelly fish . The large , soft ,blue type.
I have considered installing a parallel r/water intake , linked to the main intake.

Ideas and suggestions would be welcome.
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Old 20-11-2014, 14:51   #2
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Re: Raw Water pump failure

As long as your intake is sized correctly I would be hesitant to punch another hole in the hull. How about a bigger sea strainer.
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Old 20-11-2014, 15:08   #3
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Re: Raw Water pump failure

Hi Barnaclejim, I should have mentioned that the jelly fish , and the area i'm in , Moreton Bay ,is currently plagued by them, measures up to 300mm in dia. and is roughly sphere shaped. The blighter must have been suctioned to the inlet ! After fitting a recon pump, the blockage repeated within a short time.I was able to manually close down ! Eventually, was obliged to sail 20 nm to clear ,clean water as the boat was desperate for power and water !
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Old 20-11-2014, 15:23   #4
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Re: Raw Water pump failure

How about an alarm that senses water flow instead?
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Old 20-11-2014, 16:54   #5
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Re: Raw Water pump failure

Face it, you are going through a bad spell. There is a flow sensor for not much $$ and you have a temp alarm right?
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Old 20-11-2014, 17:51   #6
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Re: Raw Water pump failure

The water pump failed or just the impeller?

As others have suggested, you can install a water flow alarm. Problem is, next time something else bad will happen.
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Old 20-11-2014, 18:38   #7
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Re: Raw Water pump failure

Aqualarm.net

Raw water flow detector/alarm sounds alarm the instant water flow is restricted.
Should be mandatory equipment on all boats.
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Old 21-11-2014, 07:37   #8
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Re: Raw Water pump failure

Quote:
Originally Posted by boatpoker View Post
Aqualarm.net

Raw water flow detector/alarm sounds alarm the instant water flow is restricted.
Should be mandatory equipment on all boats.
Great link. Thanks
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Old 21-11-2014, 11:44   #9
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Re: Raw Water pump failure

How did this cook the pump? Shouldn't it just have chewed up the impeller?
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Old 21-11-2014, 11:52   #10
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Re: Raw Water pump failure

I much appreciate feedback on pump problem. Clearly,the flow failure alarm is a positive solution because it will activate well ahead of the engine auto-cutout. It seems that an impeller has a life of less than 30 secs. without water, before disintegrating ! Cheers, Bob
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