When
an armour plate is glued either into
or
onto the gasket it can fall out or be dislodged,
and the full circumference sealing capability of the clamp
will be lost.
When
an armour plate is glued into
the gasket, it may not fit properly, leaving gaps or crevices
at one or both ends that can cause low-pressure points.
(See Figure 1)
Under pressure these low-pressure points "sink"
to fill the gaps shown in the schematic diagram, leaving a
potential leak path between the pipe and gasket.
On
the other hand, when armour plates are glued onto
the gasket, or welded to the
clamp's shell, they protrude, and there is
no uniformity in the transition from rubber to metal
(see Figure 2)
The
protruding armour plate will, under pressure, create low-pressure
points and potential leak paths between the pipe and gasket.
CASCADE'S PERMANENT SOLUTION
Recognising
the armour plate's crucial role, Cascade
only fits gaskets where the armour plate has been vulcanised
into the rubber at the time of moulding. This ensures:
- that
the armour plate in a Cascade repair clamp can never fall
out - it
is permanently fitted every time
- that
there are no gaps or crevices at either end of the armour
plate -
it fits perfectly every time
- that
the thickness of the sealing area at both ends of the armour
plate conforms to the thickness of the rubber - a
smooth transition from rubber to metal every time.
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ARMOUR
PLATE
GLUED INTO GASKET
Stainless
Steel
Rubber Sealing
Shell Gap
Gap Gasket
Weak
Point Pipe
Weak Point
Figure 1
ARMOUR
PLATE PROTRUDING
ABOVE LEVEL OF RUBBER
Stainless
Steel
Rubber Sealing
Shell
Gasket
Weak Point
Pipe
Weak Point
Figure
2
VULCANISED ARMOUR PLATE
Stainless
Steel
Rubber Sealing
Shell. Smooth Transtition.
Smooth Transtition.
Gasket
Pipe
Figure 3
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