Operation & Maintenance of Power Plants
Bent to efficiency
High efficiency, low emissions and cost-optimised construction processes – these are the demands for power plants and their construction.
Las demandas de las centrales de energía y su construcción son la alta eficiencia, las bajas emisiones y la construcción con costos optimizados.
Hohe Effizienz, geringer Schadstoffausstoß und kostenoptimierte Konstruktionsverfahren sind die wesentlichen Anforderungen beim Bau von Kraftwerken.
P
Fig. 1. The CNC 100 DB Twin bends high-strength materials with process reliability with a bending radius of 1 x D and below.
ipelines have an essential significance. On the one hand, tubes or pipes made of wear-resistant and resilient material, as well as small
bending radii, enhance the degree of efficiency of power plants. On the other hand, lean tube bending processes and automated production lines themselves provide a decisive contribution to cost efficiency in power plant construction. Te higher the process temperatures of
power plants, the higher their efficiency. So that pipelines can resist the high temperature loads of 600˚C and more, (high) temperature-resistant steels such as T91 are increasingly being used. In comparison to normal steels, these
have the required creep strength to resist the loads through pressure and flow values. When forming these tubes, one must, however, take various aspects into consideration. Due to the strength of these steels, the bending machines used here must have the necessary bending forces. Yet despite the strength, these materials react more sensitively and wall-thickness tapering and out-of-roundness can occur in the bend. It is therefore essential that the tube bending machines engaged for pipelines in power plant construction meet the corresponding tolerance specifications.
Tese include the European standard EN 12952 or that of the American Society of Mechanical Engineers ASME B31.1. Heavier wall thicknesses and smaller bending radii are required to manufacture these high-performance boilers. Not infrequently, the minimal bending radius must be 1 x D, depending on tube diameter (in part also less than 1 x D). In view of the high temperature-resistant and sensitive materials, the bending challenge behind this is correspondingly significant.
Two bend heads Processes can be designed cost efficiently through efficiency increase not just in power plant operation. Lean production processes already provide an essential contribution towards cost efficiency during the construction of power plants. Tat is the reason why machines with two bend heads have established themselves for the production of pipelines, because they permit time-optimised production of complex tube serpentines. Te CNC 100 DB Twin by Schwarze-
Robitec represents such a solution. It has two bend heads that can be moved vertically and horizontally (1x left bending, 1x right bending), which bend the tube alternately clockwise and anticlockwise. In this manner, the machine offers high flexibility, for example when manufacturing
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