14
Installation – seacocks
Siting and installing the seacocks
H
aving chosen the type of inlet and
discharge seacocks required for
your particular needs, they should
be mounted in the hull. We recom-
mend Blakes Seacocks for use with
our marine toilets. The inlet is
19mm (¾“) and the outlet is 38mm
(1½“).
T
he inlet seacock should be about
460mm (18“) below the water line
and forward of the discharge sea-
cock. On a sailing vessel, the dis-
tance below the water line may
have to be more to allow for heel-
ing. The discharge seacock should
also be below the water line but
need not be as deep as the inlet.
T
he location of both seacocks should
be convenient for attaching piping to
and from the toilet and easily acces-
sible for turning off. Ensure that they
are positioned to accept the hoses
before drilling the holes to accept the
fixing bolts.
Fitting the seacocks to the boat.
For fibre-glass boats (Glass
Reinforced Plastic) we recommend
the fitting of a wooden pad, bonded
to the hull, slightly greater in diame-
ter than the seacock flange and
13mm to 19mm (½“ to ¾“) thick(see
fig. 1). To ensure watertight joints on
Fig. 1
¾“ INLET SEACOCK WITH STRAINER
CHAMFER
EDGE
WOODEN
PAD
GRP
HULL
GRP hulls, a small amount of under-
water sealing compound should be
put between the inside skin and this
pad and also under the seacock
flange
For wooden hulls, ensure that
drilling is carried out in the centre of
a hull plank.
For steel hulls. (see fig. 2, the sea-
cocks must not under any circum-
stances be bolted directly onto the
hull. They should be isolated with a
gasket and studded with stainless
steel fittings. This is to prevent elec-
trolytic action.
For aluminium (alloy) hulls, special
aluminium seacocks should be used.
Plastic seacocks are often used but
are not recommended by Lloyds
because of the possibility of melting
in the event of a fire.
S
eacock spigots should be cut off to
suit the outside of the hull. The inlet
seacock should be flush with the out-
side of the hull and a strainer fitted.
Similarly the discharge seacock
should protrude to enable it to take
the discharge plate.
Fig. 2
RUBBER or
NEOPRENE
STUD
STEEL HULL
PAD WELDED
TO HULL
Summary of Contents for BLAKES LAVAC Popular 4610-000
Page 6: ...6 Exploded diagram of the Lavac Popular...
Page 10: ...10 Exploded diagram of the electric pump 12 24 Volt...
Page 13: ...13 Lavac operation...
Page 31: ...31 Note...