𝗧𝗕𝗠 𝗥𝗲𝗳𝘂𝗿𝗯𝗶𝘀𝗵𝗺𝗲𝗻𝘁 𝘃𝘀 𝗥𝗲𝗺𝗮𝗻𝘂𝗳𝗮𝗰𝘁𝘂𝗿𝗶𝗻𝗴
Depending by the equipment future use, it may be not always necessary to specify the highest and most expensive level of rebuilt. Therefore 2 levels of rebuilt are established:
1) 𝗥𝗲𝗳𝘂𝗿𝗯𝗶𝘀𝗵𝗺𝗲𝗻𝘁 (lower level extending the useful life of the product)
2) 𝗥𝗲𝗺𝗮𝗻𝘂𝗳𝗮𝗰𝘁𝘂𝗿𝗶𝗻𝗴 (higher level establishing a full new life cycle for the product)
In TBM business, due to the complexity of the equipment and to specific project requirements, mixed solutions might be chosen.
If you are interested to get more details about this topic, you might read the "ITAtech guidelines on Rebuilds of Machinery for mechanized tunnel excavation" (ITAtech report n. 5-V2 / March 2019), available online on the ITA-AITES website. A useful guideline creating a common language between all different parties involved into the project, resuming the main steps to be considered for a correct planning of the works.
ITA-AITES
Bravissimi