The invention concerns a powdery product, of the type known as dry spray, for protecting centrifuge casting molds of cast iron pipes, comprising the usual components for this type of use, as well as an adjuvant for improving the flowability characteristics of said product when it is being deposited and make them less dependent on its physical or physico-chemical characteristics. Before execution of a handover for switching a destination of the relay station from the first base station to the second base station, the relay station transmits a signal regarding the second base station. The color bar may be a fixed display along side a streaming display of the data stream. A pipe assembly including a first connection system for connecting one end of a first pipe to one end of a second pipe while permitting relative rotation between the pipes, and a second connection system for connecting the other end of the first pipe to a third pipe so that rotation of the first pipe relative to the second pipe causes angular movement of the third pipe. A sub-bucketing algorithm is performed in a computer to sort stack traces associated with the customer error reports by a plurality of lines or entries in the stack traces, in order to create a hierarchy for categorization of the customer error reports.