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Grey water pump

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Relentless View Drop Down
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Joined: 17 April 2018
Location: St Maarten
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Relentless Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2020 at 13:07
Rick,  Iíve had one pump failure and one switch failure.   It seems that the switch failure is pretty common, so when my failed, I decided to go with the simple float switch instead of the original electronic one.   Now that you mentioned it, you are right.  The electronic switch isnít terribly expensive.  Perhaps $10 more than the float switch.   I wonder if the float switch is a good choice....because it might constantly pulse the pump on and off if the tank is sloshing.  Where the electronic switch has the time delay....  Iím guessing this is why it was used in the first place.  

So....I donít know why I really made the change...haha!   I had to replace it ...and just thought Iíd go in a different direction.    Probably because I was looking for a project....Iím retired and bored!!!    Haha!
Rob
s/y Relentless
2015 Hanse 575
Hailing: Newport, RI
Currently: St Maarten
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Deep River View Drop Down
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Joined: 15 December 2020
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Deep River Quote  Post ReplyReply Direct Link To This Post Posted: 02 February 2021 at 18:42
hi,

I had this problem with the grey tank discharge pump this weekend , technician said that its gone and I need a new one , all the basins , showers are going into the grey tank and if it is broken you can not discharge manually, this is crab .Will I carry a spare pump with me ?

It was broken and I understood it when the water came out from the galley sink.

Not good , need a solution.
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Black Diamond View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 02 February 2021 at 18:50
I carry 2 spare fresh water pumps,   2 spare grey water pumps, and 2 spare grey water pump switches.  The pumps are simple to replace.      I do one every 18 months or so, but we use showers and the water system (like washer/dryer) quite a bit.  

There isn't much of an option to grey water tanks unless you want to change the entire design.   To me, its pretty simple to just swap it.

Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
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marcopone View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote marcopone Quote  Post ReplyReply Direct Link To This Post Posted: 02 February 2021 at 19:09
I agree, I also have a couple of spare pumps on board.
In my case this pump has never failed, 8 years of use.
I suspect the cause could be the sensor : rather often it cumulate much dirt on it and it switch the pump always on.
If you do not notice the noise or if nobody is on board it can stay on for days.


Edited by marcopone - 02 February 2021 at 21:52
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Arcadia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 02 February 2021 at 20:48
I agree with marcopone. No failures on my pumps but I have on occasion heard the pumps running for no reason. Sometimes for very long and they got very hot.  I would suspect that left long enough, they would fail. I make it a habit to keep the sensor switches clean as they will engage the pumps if there is build up on the contacts. Chenging to float switches might bring new problems of there own, so a bit maintenance is easy to do instead.
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
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Deep River View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Deep River Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2021 at 12:02
Originally posted by marcopone marcopone wrote:

I agree, I also have a couple of spare pumps on board.
In my case this pump has never failed, 8 years of use.
I suspect the cause could be the sensor : rather often it cumulate much dirt on it and it switch the pump always on.
If you do not notice the noise or if nobody is on board it can stay on for days.
Sensors needs to be cleaned , dirt on the sensors closes the circuit and lets the pump run. Not a too much work :)
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Black Diamond View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2021 at 16:34
One driver is that when the shower drain gets clogged (hair, etc..) (and only a tickle is going into the grey water box) it can work very hard and overheat.  It will run for a few minutes,   heat up and have its thermal shut-off occur,  cool down,  start up again, and repeat this process for 10 minutes.    All to do the work that it can do in 30 seconds if things were clear and flowed freely.  That burns things out just like an impeller pump running dry might.

My $0.02

Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
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marcopone View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote marcopone Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2021 at 18:15
this never happened to me.
if the shower discharge is much cloggged and little water is flowing to the gray water tank, then the pump will stay on for a very short time until the tank is empty and then will stay idle until the level will slowly raise again.
this is not a critical condition for the pump.
besides if the clogging is so severe you will notice very soon that the water is raising above the floor.
in my case just one discharge cleaning is necessary every 2 months.
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Arcadia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2021 at 18:40
Rick. I donít get it either. How does low level in the tank cause the pump to run excessively? Also, the discharge pump is a diaphragm pump with internal check valves. It wonít overheat by running dry the way an impeller pump would. However, if debris gets lodged in the check valve, it can cause the pump to run without actually pumping. Another reason to keep thing clean!
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
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Black Diamond View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2021 at 18:52
Its not running dry.   Its just running,  shutting off, running, shutting off, running, shutting off, and taking 10 times as long to do something.    My guess is this has a lot to do with heat build up and eventually it fries..





Rick
S/V Black Diamond
Hanse 575 Build #192, Hull# 161
Newport, RI
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