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The Process | |
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C.I.P.P. linings
are individually manufactured to suit the exact dimensions of the
pipe to be lined, the thickness being determined by the individual
design requirements.
The basic lining tube is made of
polyester felt with an outer coating of polyurethane to create
a sealed lining. The strength of C.I.P.P. is derived
from polyester resin which is mixed with a suitable catalyst system
and introduced into the felt tube.
By using a vacuum pump to evacuate all
air from the felt lining, the perfect conditions for resin
impregnation are achieved.The vacuum allows the resin to soak
thoroughly into the felt and assists in achieving maximum strength
after installation.
On curing the resin sets hard, forming a
three dimensional cross linked structure with strength in tension,
compression and flexural modulus.
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 On completion of resin impregnation the lead end of the C.I.P.P. lining is turned inside out, forming a turnback.After being clamped to a collar, water is introduced into the turnback.
The weight of water causes the lining to
continue turning inside out along the damaged pipe and constant
addition of water maintains the pressure in the lining which ensures
that it is pressed firmly against the pipe wall.
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 When the inversion of C.I.P.P. is complete the water from inside the lining is circulated through a mobile hot water boiler unit.The temperature of this water is gradually increased to achieve controlled cure of the thermos-setting resin. The ends of the newly formed pipe are then cut and trimmed.
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