Practical Boat Owner – September 2019

(singke) #1

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During our fi rst season with
the boat, domestic harmony
was somewhat marred by a
problem with the sink drain.
We have a double sink and
every time we pulled the plug
on one side it promptly fi lled
up the other side until
eventually it all drained away.
This got me thinking as I
recalled it happening to other
boats which I had sailed.
In our case it became
apparent that since the
drains from the two sinks
were closely connected, as
you tried to drain the water
out of the fi rst sink it was
being held back by a pocket
of air in the drain pipe and
therefore the easiest route for

the waste water was to fl ow
across to the second sink.
So what was needed was a

was to add a splitter or
divider in the connecting
drain pipe which allowed the
waste water to go one side
and the air to escape the
other side.
Such a divider could not
be sourced over the counter
so I made one by modifying
the existing parts as
described here.
By adding the divider it
completely eradicated the
problem and domestic
harmony was restored.
The technique of using
plastic pipe as a source of
material that can be heated
and formed and then glued,
can be applied to numerous
other fabrication projects.

Twin sink situation


Simon James improves his galley’s dual sinks


means of allowing the pocket
of air in the drain pipe to
escape. What worked for me

LEFT
Simon James
sails a Najad 360
called Dolphy8
out of Plymouth
BELOW
The twin sinks
aboard Dolphy8:
any attempt to
drain one would
lead to the waste
water back-fi lling
the other, until
they both slowly
drained

First sink
Second sink

Trapped air
in down pipe

Water in
down pipe
below sea
level

Divider in
position

Waste water

Sea level

Escaping
air

Divider

Sea level

Sink elbow
joints

T section T piece

Down pipe

Sea
cock

Components and stages of assembly of the T-piece with its integral divider

C
F

ol

ey
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