Event details
| Voyage: | IN2020_V01 [details] |
| When: | 2020-02-29 13:38:52 UTC - entered into Elog/Everlog as 2020-02-29 13:38:52 |
| Log: | Updated Dredge in2020_v01 |
| Equipment: | Not specified |
| Position: |
Latitude: -32.76883 Longitude: 101.07383
- entered into Elog as 32 46.13 S, 101 04.43 E |
| Dredge Number: | D19 |
| Wind Direction (deg): | 7.71 |
| Planned Heading (deg): | 160 |
| Dip Direction of Slope (deg): | 020 |
| Current Velocity (m/min): | 3.0 |
| Current Direction (deg): | 245 |
| WP2 Depth (m): | 4250 |
| Ellipsoidal Distance (metres): | 1100 |
| WP1 to WP2 (metres): | 1340 |
| WP3 Target Wire Out (m): | 4873 |
| Speed Through Water Average (WP1 to WP2) (knots): | 0.3 |
| Speed Over Ground Average (WP2 to WP3) (knots): | 0.3 |
| WP3 Actual Wire Out (m): | 4871 |
| Ship speed at retrival (knots): | 0.4 |
| Ship speed at retrival (m/min) (auto-filled): | 12.35 |
| Retrival Wire Speed (m/min): | 15 |
| Wire Out at First Tension Spike (m): | 4869 |
| Tension Max (Tonnes): | 12.5 |
| Hung Up: | Yes |
| Wire Out Off Bottom (meters): | 3700 |
| Overall Operation Rating: | 7 |
| Completion Time: | 30 |
| Attachment: | 200229_142335_D19_start_of_dredge.JPG,200229_173650_D19_grafana_retrieval_of_dredge.JPG |
| Dredge in water at 13: | 39. Using stop-and-drop technique for dredge in-water approach. |
| Start paying wire out (60 m/min) at 13: | 44. |
| Dredge on bottom at 14: | 59, wire out 4175 (+100m sacrificial). |
| Paying out 30m/min along dredge trajectory starting at: | 21. |
| Commence dredge haul in (-15m/min) at 15: | 30. |
| Tension spikes: | 52 (wire out 3950m, depth 3870m); |
| Dredge off bottom at 17: | 08 wire out 3700m, depth 3848m pos 101.07,-32.77. Haul in at 30m/min. |
| Haul in at 60 m/min at ;17: | 12. |
| Dredge at surface at 18: | 30. Major knot present on sacrificial wire. |
| Comments: | Dredge in water at 13:39. Using stop-and-drop technique for dredge in-water approach. Dredge bottom start (WP2) is at 101 4.497,-32 46.192 at a target depth of 4250m. Planned WP3 is 101 4.781,-32 46.756. Wind is ~13 knts from 130. Start paying wire out (60 m/min) at 13:44. Dredge on bottom at 14:59, wire out 4175 (+100m sacrificial). Paying out 30m/min along dredge trajectory starting at: 15:03. Stop paying out at: 15:21. Commence dredge haul in (-15m/min) at 15:30. Tension spikes: 10.6t at 15:30; 10.9 at 15:32; 11.1 at 15:33; 10.9 at 15:36; 11.5 at 15:38; 11 at 15:40; 11.3 at 15:42; 11 at 15:44; 11.5 at 15:46; 11 at 15:48; 11.3 at 15:51; 11.4 at 15:53; 11.7 at 15:54; 11.9 at 15:56; 11.4 at 15:56; 11.5 at 15:59; 11.7 at 16:01; 11.9 at 16:03; 11.8 at 16:04; 12.5 at 16:06; 12.5 at 16:08 - hookup, paying out at 16:11; unhooked at 16:15, wire out 4260m; 12.4 at 16:16; 12.4 at 16:18; 12.4 at 16:20 - hookup (wire out 4185m); unhooked at 16:26; 11.2 at 16:31; 12.3 at 16:32; 12.2 at 16:35 - hookup (wire out ~4035m); moving slightly downslope (to north) to unhook; unhooked at 16:52 (wire out 3950m, depth 3870m); Dredge off bottom at 17:08 wire out 3700m, depth 3848m pos 101.07,-32.77. Haul in at 30m/min. Haul in at 60 m/min at 17:12. Dredge at surface at 18:14. Onboard at 18:30. Major knot present on sacrificial wire. |