Description
The annealing process of the tubes takes place in the annealing line. It
consists of a preparation - preparation table (1), where the bundle of tubes is
wrapped and bound on a continuous wire (8) passing through retorts in a
continuous annealing furnace (3). A driving take-off wheel (2) is located between
the preparation table (1) and the annealing furnace (3). In the annealing furnace,
the annealing process itself takes place at a temperature of about 1100 °C, or in
retorts in a hydrogen atmosphere. The tube bundle then passes into a cooling
trough (5) respectively into the cooling stainless steel tubes. Here, the annealed
tubes are indirectly cooled by water through the wall of the stainless steel tubes, i.e.
the annealed tubes are not in direct contact with the cooling water. A gas inlet (4) is
located between the annealing furnace (3) and the cooling trough (5). Hydrogen is
used as an inert annealing atmosphere during the annealing process. Nitrogen is
used as a safety gas to 'purge' the air atmosphere from the annealing retort and
cooling tube. The next step is the table (6) where the tube bundle is unwound from
the continuous wire (8). Tying and untying of the tubes is carried out by the
annealing line operator. At the end of the line is a driven take-off wheel (7). The
reversing of the continuous wire (8) takes place under the cooling trough (5) and
under the annealing furnace (3). Subsequently, the continuous wire (8) is returned
to the annealing furnace (3) via the driving take-off wheel (2).
The annealing of the tubes in the annealing furnace softens them so that
after further technological steps they can be prepared for drawing on the drawing
machines.
The gas supply is led from external storage tanks located outside the
production hall in the north-western part of the site. The piping penetrates the
building at the northwest corner of the 1st floor perimeter wall, where the main
shut-off valves are located, and from there it is routed along the west and south
walls to a line located in the southeast part of the site. The pipework from the
external storage tanks to the perimeter wall is routed under the internal company
road.
Note: The number of retorts in the annealing furnace can be up to 5, currently we
have 3 retorts installed.
*) This is an approximate consumption of gases H2, N2
Please note that this description may have been translated automatically. Contact us for further information. The information of this classified ad are only indicative. We recommend to check the details with the seller before a purchase