Introduction
Intumescent pipe wraps offer a low cost, easily installed alternative to metal-cased pipe
collars. They have been designed for use on uPVC thermally-softening pipes in situations
where the wrap will be fully 'cast in' to the structural element. Description
Based on a graphite intumescent material which provides a high pressure force to close the
penetration as the pipe softens in a fire. This fibre-reinforced material exhibits an
excellent resistance to erosion and enables extended periods of fire resistance to be
achieved. Its intumescent reaction commences at 190'C with low smoke emission and no
halogen by-products from combustion being produced. The pipe wrap utilises several layers
of intumescent mat dimensioned to suit the pipe diameter, backed with a pvc tape and
fitted with self-adhesive togs for fastening. They are resistant to water and most liquids
commonly found in the building environment.
Installation
Intumescent pipewraps are simply wrapped around the circumference of the pipe to be
protected and the ends joined with the self-adhesive tag. It is then moved along the pipe
to a position within the floor slab 12mm from the underside; or centrally within a wall
but no more than 52mm from each side. Finally, the pipe wrap is grouted in place with
sand/cement mortar to give a neat finish to the pipe penetration and to facilitate
decoration. Care must be taken to ensure that the wrap is not damaged by any rough edges
or sharp projections in the masonry or by the trowel. |
Performance
Intumescent pipe wraps have been independently tested on both vertical and horizontal
pipes, following the temperature and pressure conditions specified in BS476: part 20:1987.
They are approved for use on uPVC pipes of 55 82, 110 and 160mm OD and certified for fire
resistance of four hours in both wall and floor elements. Test evidence is available on
request. |
