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Hydraulic fittings and material internal stress

Hydraulic fittings of brass with gas thread for sealed connections in plumbing and heating systems

The hydraulic fittings are sealed using gas threads of the conical type, with the addition of a sealing material on the thread. The material used to make these items is brass that has undergone a hot stamping process which, if not carried out correctly, can lead to serious corrosion cracking problems.
The threaded hydraulic fittings with cylindrical thread are paired with male conical threaded pipes, causing radial stress that is proportional to the torque used to screw them. The crystalline structure of the material must be extremely homogeneous, in order to avoid concentrated stress points which can start the corrosion cracking process. A suitable tightening torque must therefore be applied.
Even the choice of sealant used with the hydraulic fittings can influence this phenomenon, therefore it must be suitable for the type of fitting and for the fluid to be transported.

 

01/06/2017


See also
01/06/2015 The stress corrosion cracking (SCC) and threaded brass fittings Reducing the effects of stress corrosion cracking (SCC) in the threaded brass fittings, even during their installation.

01/04/2017 Gas fittings: construction and sealant GNALI BOCIA gas fittings are made from brass and every versatile

01/11/2014 Sealing hydraulic fittings Use of Teflon and sealants for sealing joints made ​​of brass hydraulic fittings

01/05/2014 The importance of lead in hydraulic fittings Lead is an element that enhances the workability in cold conditions of hydraulic fittings and therefore it should be added in small quantities.

01/06/2016 Brass fittings and their sealing In order to seal joints with brass fittings, it is necessary to choose the right sealing material that is compatible with the system fluid.


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