Eurotubi Pressfitting System - Technical Guide ... - Damstahl

Chased pipes must not be in direct contact with the plaster, but wrapped in a pad of elastic material, such as
glass wool or plastic foam (fig. 10). Thus fitted, soundproofing requirements are also satisfied.
Under a “floating” floor, pipes are laid below the isolation layer and can expand freely (fig. 11). Vertical
channels must be coated in elastic insulating materials. The same type of coating must be applied to pipes
passing through walls and ceilings.
8.3 Expansion compensators
Minimum pipe expansion can sometimes be compensated for by the degree of elasticity of the pipe system
itself. If this is not possible, expansion compensators must be used.
There are several types:
- axial expansion compensators;
- U-shaped expansion compensators;
- Z-shaped expansion compensators.
Fig.12 shows the configuration of flanged and threaded axial compensators, connected to Eurotubi
pressfittings.
Fig.13 shows the configuration of U-shaped compensators, while the diagram in fig. 14 allows the
compensation length to be calculated, for the estimated expansion, in stainless steel pipes.
Similarly, fig.15 shows the configuration of a Z-shaped compensator, while the diagram in fig. 17 allows the
compensation length to be calculated, for the estimated expansion, in stainless steel pipes. The latter
diagram can also be used to calculate compensation in T-shaped branches (fig.16).
8.4 Pipe fixing
The pipe support collars serve two purposes:
- keep the system in its correct position;
- orienting expansion caused by temperature fluctuations.
There are two types of collars or fixing points:
- fixed, which lock pipes rigidly;
- sliding, which allow axial movement.
Positioning fixing points
A pipe with no changes of direction or expansion compensators must have only one fixed anchoring
point (fig. 18). In case of long pipes, we recommend placing this collar towards the centre of the section
so as to allow expansion in both directions. This solution is also particularly suitable for vertical pipes
that pass through many floors precisely because it allows for expansion in two directions, also
decreasing stress on the branches.
Without excluding the necessary expansion vents, the fixed collars are also placed near components and
terminals, which are not subject to movements. In addition the sliding collars must be positioned so as not to
become dangerous fixed points (fig. 19) and fixed points must not be created on fittings (fig. 20).