Fairline Corniche, where to put holding tank (black water)

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Fusebox

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Hello,

Newly registered to the forum, but long time reader.

I have been searching "all over" for any information on where to install a holding tank in our Corniche.

We have the twin-cab layout, with dinette, and twin Volvo 41 with shaft installation. Beds crossed in the forward cabin.

We have a small holding tank installed forward of the SB engine, but with 40 liters, it is much to small for comfort, for a family of 4.

I am considering installing a tank under the dinette floor, but I am reluctant to do any invasive work without knowing what is below.
Another option is to install under the galley floor, same reluctance applies...

As far as I know, there was also an option of a water tank placed in the bow. It requires some dismantlig for access, but should be possible.

Any advice on the matter would be greatly appreciated.

Thank You.
 
Fusebox said:
Hello,

Newly registered to the forum, but long time reader.

I have been searching "all over" for any information on where to install a holding tank in our Corniche.

We have the twin-cab layout, with dinette, and twin Volvo 41 with shaft installation. Beds crossed in the forward cabin.

We have a small holding tank installed forward of the SB engine, but with 40 liters, it is much to small for comfort, for a family of 4.

I am considering installing a tank under the dinette floor, but I am reluctant to do any invasive work without knowing what is below.
Another option is to install under the galley floor, same reluctance applies...

As far as I know, there was also an option of a water tank placed in the bow. It requires some dismantlig for access, but should be possible.

Any advice on the matter would be greatly appreciated.

Thank You.
Click to expand...

You need to contact Ed Engels he was line manager for the Corniche
He now runs his own Fairline refurb business and is a font of info
Sorry dont have his number,try google
best of luck
 
Thanks for info. I'll try contacting Ed Engel. Anyone know if he has an e-mail address ?

carlton;By the "Lazarette", if you mean the WC.. there is no room available.
 
Under the carpet in the front cabin is a hatch which is surprisingly spacious.

I used to keep a spare Danforth, chain/warp , 3x pro sets (6) in there.

You would need the flexible bag type to fit it in but there would be my first choice .

Having said that an electric loo with a chemical pre treated flush macerates everything and treats it ready for immediate discharge, job done !

Check you local restrictions, if it just says it is illegal to discharge untreated sewage , then pre treat the flush with environmental friendly chemical and fit an electric loo .
 
Last edited:
It seems I have quite a lag with my posts (as a New User), so forgive me if I miss out on replies, or doublepost anything :-)

I found a few numbers for Ed Engel, and will try my rusty spoken english in the near future. E-mail would be preferred, so not to scare the fellow.

The Corniche indeed runs a bit bow-up, and a holding tank in the bow would be a good choice. I have no way of looking into that space, without cutting a hole somewhere.

In Norway, we discharge the contents into the sea, in our case it is macerated on the way out. We need to be 300 meters away from any shoreline before we discharge, as regulation states.

We usually go boating to islands, and usually there are lots of other boats side-by-side, so a chemically treated, direct discharge, is not an option.

I know there is room below the forward cabin floor, but it is occupied by a bow-thruster and tunnel.
The space below the galley floor is often used on the Turbo 36, for one, but I'm afraid of weakening the galley floor if I open it up. A stainless steel tank would probably be solid foundation when I replace the floor, but would very much like to know what is below before doing anything.

I hope a Corniche owner picks up on this thread, with an existing and recommendable solution
 
Hi There, I am that Corniche owner but been struggling with the same question.

i know of 2 Corniches with a holding tank in the Lazarrette under the cockpit floor where there is plenty of room. Although this would affect trim it would only really do so when part full or more, but the pipework is quite long

I am interested in the location in front of the SB engine- interesting and for me a small tank for occasional use would be fine

While we had new carpets fitted i found an inspection panel in the floor in front of the Galley, however it is not that large although a collapsable tank might end up bigger than what you have at the moment

i have the tri cab, with a double berth and was wondering about putting it in the bottom of the wardrobe

In summary though if you want a familly size tank with minimum cutting then I think the lazarette sounds the option
 
I am going to our boat this evening, and will try to take some pictures of our installation.

I checked the available space there, and a tank of approximately 140 liters (48 x 60 x 50 cm) will fit in there. I'll probably have to remove the engine to put it there, so it is not my first choice.

There is a very nice tank available that would fit nicely in the lazarette (if that is what the room below cockpit is called)
(picture here : http://www.plastinvent.no/component.../product/36014b5a8cbb2b11dd5aa3951a8aba5f.jpg
Costs about Nkr. 6000,- (£550) with a Wema indicator)

As stated earlier, the tank would not add any cruising weight, as it would be emptied as soon as distance to shore allows. We would lose quite a bit of storage space, but might use the opportunity to be a little more selective of our camping gear :-)
 
After some consideration, I am going for a 190 liter tank to be mounted in the lazarette. It will reduce available storage space, but comfort is a higher priority.

I can always optimize the installation afterwards, by using one of the "dead" spaces if necessary. The installation is non-intrusive, and easily removed if needed.

I'll try to update with pictures and progress, for those who might be interested.
 
Installation...

The tank was installed, and has been tested on a 3 week boating trip. Just returned yesterday, so here's the update :

First, all work has to be done behind the new tank, as it will be a bit cumbersome to do it later... Picture towards SB in the lazarette :
View attachment 19966

Test fit of the tank. I was not entirely sure it would fit, but had 5 cm. margin for error :
View attachment 19968

Good thing I had an error margin :
View attachment 19970
View attachment 19971

The tank fits very well, and seems to be made for the Corniche.

The pump needs to be mounted somewhere, and this is my solution. I made the mount from hardware parts, not exactly beautiful, but sturdy and functional. I used a thin cork plate under the mount so not to chafe the tank with the screws, which where entered from the underside :
View attachment 19972
You can see the SB bracket for securing the tank, a little below the pump.

View attachment 19973
You can see the wiring and electrics in this picture, two relays mounted on the wall towards the anchor rope.

Here with the tank in position :
View attachment 19974

The tank was secured sideways by two brackets, one on each side. This picture shows the final installation. The hoses are not yet installed :
View attachment 19975

All in all I am very happy with the installation. The space lost to the tank was not missed much. The total cost was a bit more than anticipated, but now its there and time and money well spent.

A couple of words on the electrics :
I used two relays for the pump. First relay is for "arming" the pump with a switch, and the other relay (they are connected in series) has a loopback (hold-circuit) from the main wire (25A, 6 mm2 wire), which is activated by a push button.
The pump then runs until the "Arm" switch is switched off by replacing the switch-cover. I found a panel with an "Aircraft type" switch so that the pump can't be switched on, unless you mean to. The panel also had a button and a light that indicates an armed system.

The new waste pump failed after 10 days at sea, and was replaced a week later with a "proper" Johnson pump.
 
Probably have them somewhere, but as the harddrive gets larger and larger (bloated), things get somewhat lost... I posted the same, more or less, pictures on another forum, have a look here:
Septik tank i Fairline Corniche, beste plassering ?

A topic here as well:
Corniche 31 Holding tank location and costs - Fairline Owners Club

The tank I used was a near perfect fit, and plumbing can be installed from your own drawing/measurements:
TANK 190 L — Plastinvent

Hope this helps. Let me know if theres anythng else I can help with. There was a comment on Corniche already a bit nose-high and aft weight should be thus avoided, but no-one should have any need to lug this extra "baggage" around fro too long, so was never a problem for us.

BR.
 
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