The fixing bracket should be secured before the compensating device is pre-stretched or compressed – how should this be understood?
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\"Fixing\" refers to the installation of fixing brackets – does it also mean fixing the pipes to the brackets? I’m not quite sure about the explanation in GB/T 51132-2015: Pipe fixing brackets are installed to ensure a reasonable distribution of the thermal expansion of the pipe between the compensators, so as to evenly distribute the thermal compensation. When temperature changes cause expansion or contraction, the fixing brackets prevent the pipe from shifting at those points. The fixing bracket associated with the compensation device is fixed prior to pre-stretching (compression); this serves two purposes: it facilitates the pre-stretching (compression) of the compensator and ensures that the compensation device functions as intended. Installing pipe supports is definitely done first, but if the supports are used to fix the pipes, how can pre-tensioning or pre-compression be carried out? Our bellows compensators leave the factory in a pre-stretched or compressed state, which also does not comply with the specifications. Please **clarify the doubts**
The fixing brackets accompanying the compensation device are secured before pre-stretching (compression); firstly, this facilitates the pre-stretching (compression) of the compensator, with the fixing brackets being used for this purpose – this mainly applies to expansion bends; secondly, it ensures that the compensation device can function as intended. Before putting it into use, the temporary pre-stretching devices must be removed, as the pre-stretching force decreases or disappears once the pipeline expands thermally