Constant Hangers (C.H.) are used when the large vertical pipeline displacement doesn't allow the use of variable load Spring Hangers (S.H.). In fact, in this cases, S.H. would charge the pipeline with “additional load” due to high deviation between operating and erection load, so causing the possible damaging of the pipework system. Each C.H. is calibrated in order to show a constant load throughout its whole working range, balancing the weight of the pipeline.