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Table 7 Course of events during the 3 months before scale sample collection. Evaporator cleaning is either done by flushing the evaporator, or by opening it with subsequent mechanical removal, or by chemical cleaning. \({\hbox {T}}_{pre}\) = temperature in the ground-level pipes before interruption, \({\hbox {T}}_{post}\) = temperature in the ground-level pipes at the end of the interruption
Date | Cause | Duration | Flow rate, L/s | \({\hbox {T}}_{pre}\), \(^\circ \hbox {C}\) | \({\hbox {T}}_{post}\), \(^\circ \hbox {C}\) | Remark |
|---|---|---|---|---|---|---|
Aug 3 | Electric | 11 d | 0 | 140 | 25 | |
Aug 17 | Scales | 3 h | 110 | 139 | 126 | Flushing of evaporator |
Aug 20 | Scales | 3 h | 0 | 140 | 116 | Mechanical removal |
Aug 24 | Synchronization | 2 h | 0 | 141 | 120 | |
Aug 28 | Scales | 2 h | 110 | 139 | 132 | Flushing of evaporator |
Sep 3 | Scales | 4 h + 2 h | 0 | 140 | 118 | Mechanical removal, 2 pump starts |
Sep 12 | Revision | 13 d | 5 | 140 | 20 | Chemical cleaning |
Oct 1 | Scales | 3 h | 0 | 140 | 20 | Sample collection |