The in-vessel actively cooled components of the SPIDER Beam Source shall be drained and dried in case of major maintenance to limit as much as possible atmospheric corrosion inside the circuits and components, to prevent water spreading, and to allow the execution of vacuum leak tests of the circuits before re-installation inside the vacuum vessel. These operations are needed after the first phase of experiment exploitation of SPIDER begun in May 2018. Drying system consists of evaporation by mass transport of coolant from dead volumes to the dried nitrogen. The drying system capabilities are set for ranges of gas pressure 2-8 bar(a) and heating temperature (70-110 °C) consistently with design and manufacturing in accordance with the Sound Engineering Practice (low hazard level without CE marking applying the Pressure Equipment Directive). On the other hand, the maximum drying temperature is careful evaluations to avoid risks of damage due to excessive thermal deformations, in particular at joints between dissimilar materials and ceramic breaks. Heating up calculations demonstrate the need to increase the gas inlet pressure up to the maximum allowable value in order to decrease the time required for heating: the estimated time to heat up the Electron Dump decreases from about 10 to 3 minutes by increasing the nitrogen pressure from 2.0 bar(a) to 8.0 bar(a). Drying out calculations show that the evaporation capacity of nitrogen increases with the gas inlet temperature; moreover, higher pressures will reduce the drying out duration from about 11 minutes at 2.0 bar(a) to about 3 minutes at 8.0 bar(a). All the calculated values demonstrate the feasibility of the drying system with parameters to be monitored, in particular the gas humidity at the inlet and at the outlet of the component to be dried. A dedicated procurement was set for the realization of the Drying System as a portable skid.
Design and procurement of the Drying System for SPIDER Beam Source
Dalla Palma Mauro;Zaccaria Pierluigi;
2020
Abstract
The in-vessel actively cooled components of the SPIDER Beam Source shall be drained and dried in case of major maintenance to limit as much as possible atmospheric corrosion inside the circuits and components, to prevent water spreading, and to allow the execution of vacuum leak tests of the circuits before re-installation inside the vacuum vessel. These operations are needed after the first phase of experiment exploitation of SPIDER begun in May 2018. Drying system consists of evaporation by mass transport of coolant from dead volumes to the dried nitrogen. The drying system capabilities are set for ranges of gas pressure 2-8 bar(a) and heating temperature (70-110 °C) consistently with design and manufacturing in accordance with the Sound Engineering Practice (low hazard level without CE marking applying the Pressure Equipment Directive). On the other hand, the maximum drying temperature is careful evaluations to avoid risks of damage due to excessive thermal deformations, in particular at joints between dissimilar materials and ceramic breaks. Heating up calculations demonstrate the need to increase the gas inlet pressure up to the maximum allowable value in order to decrease the time required for heating: the estimated time to heat up the Electron Dump decreases from about 10 to 3 minutes by increasing the nitrogen pressure from 2.0 bar(a) to 8.0 bar(a). Drying out calculations show that the evaporation capacity of nitrogen increases with the gas inlet temperature; moreover, higher pressures will reduce the drying out duration from about 11 minutes at 2.0 bar(a) to about 3 minutes at 8.0 bar(a). All the calculated values demonstrate the feasibility of the drying system with parameters to be monitored, in particular the gas humidity at the inlet and at the outlet of the component to be dried. A dedicated procurement was set for the realization of the Drying System as a portable skid.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
