myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website myHanse.com - Hanse Yacht Owners Website

Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world.

Forum Home Forum Home > General > Chit Chat
  New Posts New Posts RSS Feed - Backflow from holding tank
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Backflow from holding tank

 Post Reply Post Reply Page  12>
Author
Message
Bjarne View Drop Down
Lieutenant Commander
Lieutenant Commander


Joined: 25 June 2014
Location: Bergen, Norway
Status: Offline
Points: 71
Post Options Post Options   Thanks (0) Thanks(0)   Quote Bjarne Quote  Post ReplyReply Direct Link To This Post Topic: Backflow from holding tank
    Posted: 26 May 2015 at 18:45
Hi all
We now have a couple of months of experience with our new Hanse 505, and we really enjoy living onboard.

However, we experience backflow from the holding tanks back to the toalett bowl. This applies to both heads. The tanks are not full when the brown stuff flows back - not nice Dead.

Any ideas?

Bjarne
Back to Top
Lippe View Drop Down
Commadore
Commadore


Joined: 05 September 2009
Location: Finland
Status: Offline
Points: 356
Post Options Post Options   Thanks (0) Thanks(0)   Quote Lippe Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2015 at 21:34
Hi,
Do you have manual Jabsko pumps for pumping the "brown water" from WC bowl to holding tank?
Back to Top
415 Singapore View Drop Down
Vice Admiral
Vice Admiral


Joined: 23 September 2013
Location: Singapore
Status: Offline
Points: 826
Post Options Post Options   Thanks (0) Thanks(0)   Quote 415 Singapore Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2015 at 01:55
Hi we had the same problem last week, turned out that whilst the holding tank wasn't full, both the outlet and the ventilation pipe were blocked. When we tried to pump the toilet out, this effectively pressurised the holding tank, which the joker valve in the toilet pump couldn't take and it turned itself inside out, thereby allowing a backflow of nasty stuff into the bowl.
Once we figured out what the problem was, unblocking the holding tank outlet and ventilation pipe was relatively easy, then take the joker valve out invert it and it all works fine now.
Even if your holding tank is ok, it sounds like the joker valve has inverted, otherwise you can't get a backflow.
Good luck and don't forget the rubber gloves :)
Paul - Night Train
Paul - Night Train - 415 #136
Back to Top
Bjarne View Drop Down
Lieutenant Commander
Lieutenant Commander


Joined: 25 June 2014
Location: Bergen, Norway
Status: Offline
Points: 71
Post Options Post Options   Thanks (0) Thanks(0)   Quote Bjarne Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2015 at 06:08
We have electric Jabco deliverd by Hanse. Do we have a joker valve in this toilet as well as in the manual one?

Other possibilities?

Bjarne
Back to Top
415 Singapore View Drop Down
Vice Admiral
Vice Admiral


Joined: 23 September 2013
Location: Singapore
Status: Offline
Points: 826
Post Options Post Options   Thanks (0) Thanks(0)   Quote 415 Singapore Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2015 at 07:12
Hi, there must be a one way valve of some sort, as the holding tanks are higher than the toilet, we have a manual toilet but I am sure the operation is effectively the same.
The joker valve is located in the outflow pipe at the bottom of the pump, no need to take the pump apart, just take of the outflow (2 bolts) and the rubber valve is in side the bit that comes off. It should be pointing in the outflow direction
Good luck
Paul - Night Train - 415 #136
Back to Top
Fendant View Drop Down
Admiral
Admiral


Joined: 03 November 2012
Location: Switzerland
Status: Offline
Points: 1617
Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2015 at 07:13
yes, afaik you have also a joker valve on the electric toilet. Over time small layers of calcium are building up on the "blades" of the Joker valve, meaning that they no longer close tightly. There are numerous proposals from vinegar, citric acid or decalcifier (like in your dish washer )before the nasty Job of replacing the valve itself ( Jabso has affordable repair kits ).
We are using in regular intervals a toilet oil to maintain a smooth surface in all the toilet rubber components. Our Italian forumites propose olive oil.
Frank
Back to Top
bovine View Drop Down
Commadore
Commadore
Avatar

Joined: 18 November 2007
Location: United Kingdom
Status: Offline
Points: 405
Post Options Post Options   Thanks (0) Thanks(0)   Quote bovine Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2015 at 07:50
The joker valve is not very good at holding liquids back, after a very short time they all fail ,however the holding tank is designed to fill from the top so its contents can not return, what you are seeing coming back is what you have left in the long pipe to the holding tank. Answer is to pump more clean water through every time you use he toilet, that way only clean water comes back
David
Back to Top
Bjarne View Drop Down
Lieutenant Commander
Lieutenant Commander


Joined: 25 June 2014
Location: Bergen, Norway
Status: Offline
Points: 71
Post Options Post Options   Thanks (0) Thanks(0)   Quote Bjarne Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2015 at 10:32
You may be right David, but I wonder how I can avoid this with my electric toilet. 

The Jabco electric first fill the bowl with water, activated by the "Fill" button. Then I press the "Flush" button and more water is pumped into the bowl before the pump discharges to the tank. The pump stops quite a long time after the bowl is empty, but, as you suggest, there is no guaranty that the hose is empty.

To be safe, I should probably flush the toilet twice, but this will challenge the ridiculously low tank capacity more than I like.

Bjarne
Back to Top
Bjarne View Drop Down
Lieutenant Commander
Lieutenant Commander


Joined: 25 June 2014
Location: Bergen, Norway
Status: Offline
Points: 71
Post Options Post Options   Thanks (0) Thanks(0)   Quote Bjarne Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2015 at 16:29
Originally posted by bovine bovine wrote:

... what you are seeing coming back is what you have left in the long pipe to the holding tank...

On the other side, David, when this happens, the bowl is normally filled over half ways up. The volume in the hose is probably not that big?

Bjarne
Back to Top
hanafe View Drop Down
Captain
Captain
Avatar

Joined: 17 August 2011
Status: Offline
Points: 195
Post Options Post Options   Thanks (0) Thanks(0)   Quote hanafe Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2015 at 02:07
see link old threat.

http://myhanse.com/forum_posts.asp?TID=8479&title=another-head-question

Installed a manual valve, problem solved.
Also see picture in the threat.
Back to Top
 Post Reply Post Reply Page  12>

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.06
Copyright ©2001-2023 Web Wiz Ltd.

This page was generated in 0.078 seconds.

Links : www.hanseyachts.co.uk www.hanseyachts.com www.fjordboats.co.uk www.dehler.co.uk www.varianta.co.uk