Stainless steel flexible hoses for water and gas

We have two types of stainless steel flexible hoses in the section dedicated on the company catalog of our products, and both are made of corrugated stainless steel and can be extended up to twice their original length. For the construction of these stainless steel flexible hoses there is used a stainless steel of the AISI 316L family with low carbon content, which makes it more easily weldable during the construction phases of the product.
In fact, the ends of the stainless steel flexible hoses are welded to the pipe with a controlled atmosphere TIG process, this allows a clean welding and free of slag and inclusions that could cause dangerous leaks.
As we said of this type of hoses there are two versions, one suitable for gas with an external coating in plastic material. This particular version is made to comply with the EN 14800 standard and the protection is used to limit the effect of the abrasions on the metal material.
Without the protection, the stainless steel flexible hoses comply with the UNI CIG 7129 standard and can only be used for the conduction of hot and cold water.


Flexible water hoses represent an optimal solution within water systems as they allow the connection of pipes in different directions, favoring supply in significantly different situations.
The main differences with rigid pipes are:
- Construction materials: stiffness, as a physical property, requires appropriate characteristics of the material as well as, on the contrary, flexibility;
- Versatility of use: flexible hoses can allow the connection of pipes in different directions with even complex angles. This is not possible with rigid pipes that require prior shaping in relation to the conformation of the system in which they will operate;
- Dimensions and diameters: rigid pipes and flexible hoses also have different characteristics in terms of obtainable diameters and lengths.
Both types, therefore, have advantages and disadvantages that make them suitable in certain situations: therefore, the importance of a suitable and optimal production process for flexible water hoses emerges.

The water hoses present in the Gnali Bocia catalog can be made of various materials of different nature, origin and structure:
- PVC: polyvinyl chloride is an amorphous thermoplastic polymer belonging to the class of "commodities" which has a series of important properties such as dimensional stability, resistance to atmospheric agents and a good self-extinguishing capacity. By adding plasticizers, these rigid polymers can have excellent flexibility which is essential for this application. Furthermore, to increase its resistance and stability in operation, it is possible to add suitably studied and designed textile reinforcements;
- Stainless steel: fundamental material in the world of fittings that combines strength and stiffness characteristics with excellent resistance to corrosion provided by the addition of chromium and nickel to steel (iron and carbon base alloy).

For applications in which water hoses are involved, as anticipated in the previous paragraphs, some characteristics are required:
- Flexibility: it is essential for this type of piping;
- Corrosion resistance: the presence of water can cause the creation of an environment that can damage the structure of the pipes;
- Mechanical resistance: being often positioned inside walls or in contact with other components, it is necessary that they have optimal resistance values;
- Wear resistance: flexibility can cause sliding or movements such as to create important tribological effects that can, over time, damage the pipes themselves;
- Biocompatibility: being in contact with a fluid such as water, they must not release any type of toxic or potentially toxic substance.

 

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