(57) The method comprises: realising an annular seating (12) in a mouth (10) of the tubular
element (1), which annular seating (12) has a predetermined depth (P) and is shaped
such as to define a rest perimeter (13) in a bottom thereof situated internally of
the tubular element (1); realising the plate (2, 20), with a plan profile which is
complementary to a profile of the annular seating (12), the perimeter cut surfaces
(22) of the profile being obliquely inclined in order to obtain a truncoconical conformation
of the plate (2, 20) and with a thickness (S) of the plate being virtually equal to
the depth (P) of the annular seating (12);
inserting the plate (2, 20) in the annular seating (12), such that the perimeter cut
surfaces (22) of the profile exhibit respective inclinations converging to a point
located externally of the tubular element (1); fashioning an annularlip (11) of the
tubular element (1) located externally on the seating (12), in order to superpose
the annular lip (11) onto the perimeter cut surfaces (22), thus obtaining a mechanical
blocking of the plate (2, 20) to the tubular element (1); activating sealing means
(30) associated to the plate (2, 20) and destined to realise a sealed coupling between
the plate (2, 20) and the tubular element (1).
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