On Thu, 04 Feb 2010 08:00:10 +0000, Mas Dubh
wrote:

Bruce wrote:
On Wed, 03 Feb 2010 21:50:08 +0000, Mas
wrote:

I am sussing out how to fit a shower in my Hunter Horizon 26 TK. I have
the system roughed out but am baulking at the waste disposal. The heads
compartment is a moulded part wall and floor section in plastic. I may
have to cut this to fit in a drain bund to the pump suction.

Anyone out there familiar with this sort of scope in this craft or a
similar one and how to resolve this elegantly with a minimum of
disruption to existing moulding?


I built a system in a 40 ft. boat (which is undoubtedly different). I
fabricated a fiberglass sump which contained the waste pump and routed
the waste line to the sink drain. To save space in the sump I used an
air pressure bilge pump switch to activate the pump.
Glued the sump to the floor of the Head compartment.

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)
Cheers Bruce
I am not familiar with air pressure switches - I'll check them out. My
problem is the fact of cutting out for a sump may weaken the plastic
moulding and could give rise to future leaks. Offshore on N/Sea oil
platforms it seemed always the case that the deck drains, supported by
drain pipework, ended up higher than the surrounding droopy plate - I'll
need to watch for that too. Ideally there should be no residual pooling.
The disposal route via the sink drain is my favoured option too.


My experience with the usual float switches for bilge pumps has not
been good - every one I ever installed failed. I came across the air
pressure switches which are a diaphragm operated switch connected by a
hose to a small plastic cup that mounts in the bilge. As water in the
bilge rises so does pressure in the diaphragm operated switch. I've
had these installed for years without failure.

I epoxied the sump into the floor in the Head with a couple of layers
of glass tape to reinforce the joint. No problems with the joint in
something like 6 years and we spend about half our time on the boat.

The sump contains a small Rule pump that connects to a fiberglass tube
epoxied into the sump, which in turn connects to a hose to the sink
drain. The pump wires lead through a hole in the side of the sump and
are sealed with 3M 5200. Never has a leak.

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)