Used turbomachinery, by and large, falls into two main categories. The first group is machinery that has ceased to be operational, some even removed from its location, and kept mothballed. The other group, “machinery-in-use” and substantially different from the first group, is machinery that is still in service at the time of custody transfer.
When the custodianship is transferred from one business entity (seller) to another (buyer), in order to take care of commercial interests, several technical aspects are to be considered right from the time the project is conceived. Like any project, the custodianship transfer from seller to buyer has few distinct phases, one of them being testing the turbomachinery for compliance with contractual obligation and subsequent acceptance.
There are three distinct phases, from the perspective of the turbomachinery engineer, in projects involving used turbomachinery, including the in-service group of machinery: Stage 1, Conceptual Phase—Definition of requirement or availability; Stage 2, Contracting Phase—Matching specification, review, and reconciliation; and Stage 3, Execution Phase—Testing and acceptance.