For Type B rotors, in addition to s

For Type B rotors, in addition to supports vibration velocity, proximity probes may be optionally applied to measure the relative displacement between shaft and support in proximity of the bearings. In case of test bed constraints, these probes, may not be placed on the burnishing area. Their use for Type B rotor balancing is described in the following. The shaft balancing shall be performed using balancing weights applied on the balancing planes, as reported in the rotor assembly drawing (see figure 2). These balancing weights must be installed or removed without disassembling the driving coupling. The rotor is balanced at high speed (MCS) fully assembled without coupling hub (except in case the use of coupling hub is contractually required and anyway the corrections must not be applied to the job coupling hubs or its simulator). If the MCS is not easily achievable, a preliminary low speed balancing shall be performed. All the balancing readings and the corresponding data must be recorded on the test plan. Final recordings must be performed running the rotor up to the trip speed (TS), for 2 minutes at least.