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584   C h a p t e r   1 3                              C a t h o d i c   P r o t e c t i o n    585


                          Single point
                        mooring system           Sea surface







                    130 mV drop in
                  protection potential     –650     10     20    30    40     50
                                           –670 0
                  in top 30 m of chain     –690
                                          Voltage (MilliVolts)  –730
                                           –710
                                           –750
                                           –770
                                           –790
                                           –810
                                           –830
                                           –850
                                                       Distance from top of chain
                 FIGURE 13.48  Estimated protection potentials on the SPM and its anchoring
                 system. (Courtesy of Robert A. Adey, Computational Mechanics BEASY)


                 References
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