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april 2011

Precautions when assembling flexible water hoses

Flexible water hoses are produced in accordance with the uni cig 7129 standard that does not include a plastic sheath

Correct installation of the water hoses is essential to make this component work properly, which has become increasingly important inside, especially, the hydro-sanitary systems. It is important to note, however, that at the time of delivery, the tube is accompanied by the assembly instructions.
This operation, even if it requires basic knowledge, is a necessary step to guarantee all the functional properties of the applications in which it is installed. The basic rules, mainly dictated by experience and common sense, are:

1. Avoid any assembly of the tube that leads it to work in a state of tension: it must be ensured that the distance that the tube must cover is less than its length. For the same reason it is necessary to check that the tube is not bent or that it is not twisted on itself: these defects, if not necessarily required during the design phase for particular needs, can create more or less serious problems;

2. Check the environment in which it operates: environmental conditions or dangerous contacts are particularly harmful for the resistance and durability of the component;

3. The assembly of the gaskets and fittings must be carried out correctly, whether it is O-Ring type gaskets or deformation gaskets. In addition to this, it is essential to ensure adequate tightening that can be achieved with various types of tools: both simple wrenches and more sophisticated devices such as torque wrenches can be used. A too loose tightening can give problems of leaks or pressure losses while, if the tightening is too strong, there is a risk of breakage of the component with the consequences that derive from this;
By respecting these simple and basic rules, it is possible to obtain a state-of-the-art assembly by avoiding frequent and expensive intervention on the system to correct defects that can be solved beforehand. In fact, having quality water hoses available, such as those made by Gnali Bocia, is a necessary but not sufficient condition for optimal operation: without proper assembly, you risk losing both money and time!

Obviously these are only preliminary rules, which must also be accompanied by technical requests:
- The position of the curve cannot be near the fitting, but at least at a distance of 50 mm from it: this requirement reduces breakages and increases the performance of the component;
- The curvature must also not be greater than three times the diameter to avoid any problems related to aging, a particularly important phenomenon that characterizes highly bent tubes.
In principle, it can be said that by respecting both the first and the following rules, it is possible to exploit the component in an adequate way, guaranteeing excellent operation and a reduction in the costs necessary for maintenance and control over time.



See also
03/05/2019 Flexible water hoses: everything you need to know

03/02/2020 Hose for LPG realized according to the EN ISO 3821 standard Characteristics of the hose for LPG laid down by the ISO 3821 standard relating to welding equipment

03/12/2019 The range of tubular heating elements According to practical needs, Gnali Bocia has equipped its catalog with a decisive choice of tubular electric resistances Gnali Bocia offers a number of types of tubular electric resistances

03/10/2019 The TIG welding for metal flexible hoses The metal flexible hoses of the Gnali Bocia catalog

03/06/2019 Operation and description of the multilayer fittings

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