Insulation system

DETAILED DESCRIPTION The object of the present invention is therefore to provide an insulation system of the above type which enables good thermal insulation to be obtained with little maintenance work.
This object is achieved by the insulation system with the above-mentioned features, in that the insulation system comprises means for equalizing pressure between the insulating material and an internal chamber, which means are arranged over a large area relative to a surface of a layer of insulating material.
The insulation system according to the invention has the advantage that the arrangement of pressure-equalizing means over a large area greatly reduces the speed of a pressure-equalizing gas flow when impacting the insulating material.
Tearing away and entrainment of particles of insulating material are thereby avoided and hence contamination of the pressure chamber with eroded insulating material is largely prevented.
A serious drawback of previous apparatus and methods known from prior art is that, with very rapid pressure reduction, pressure equalization through ventilation holes in a cover of the insulating material cannot take place fast enough.
When the pressure changes there is therefore a pressure difference between the surrounding gaseous medium and the insulating material, leading to exertion of force on the cover.
This may result in failure of the corresponding components through excessive bulging.
Since the insulating material in the system according to the invention may be pressurized over a large area and pressure changes occur very quickly, a pressure difference cannot build up between the gaseous medium of the gas flow and the insulating material.
The force exerted on corresponding components of the system is therefore minimized, thus particularly lengthening the life of the system.
In the insulation system according to the invention pressure differences cannot build up when the pressure changes, and the forces acting on the system are therefore weak, so the strength requirements for a supporting structure or covers of the system are reduced