Event details
| Voyage: | IN2020_V01 [details] |
| When: | 2020-02-19 13:28:13 UTC - entered into Elog/Everlog as 2020-02-19 13:28:13 |
| Log: | Updated Dredge in2020_v01 |
| Equipment: | Not specified |
| Position: |
Latitude: -32.01083 Longitude: 96.168
- entered into Elog as 32 00.65 S, 96 10.08 E |
| Dredge Number: | D15 |
| Wind Direction (deg): | 7.76 |
| Planned Heading (deg): | 030 |
| Dip Direction of Slope (deg): | 120 |
| Current Velocity (m/min): | 9 |
| Current Direction (deg): | 359 |
| WP2 Depth (m): | 2270 |
| WP3 Depth (m): | 1454 |
| Ellipsoidal Distance (metres): | 1250 |
| Target Wire Factor: | 1.0 x WP2 water depth + 150m |
| WP3 Target Wire Out (m): | 3354 |
| Speed Through Water Average (WP1 to WP2) (knots): | 0.25 |
| Speed Over Ground Average (WP2 to WP3) (knots): | 1.3 |
| WP3 Actual Wire Out (m): | 3354 |
| Ship speed at retrival (knots): | 0.3 |
| Retrival Wire Speed (m/min): | 15 |
| Wire Out at First Tension Spike (m): | 3354 |
| Tension Max (Tonnes): | 10.6 |
| Hung Up: | Yes |
| Wire Out Off Bottom (meters): | 1870 |
| Overall Operation Rating: | 7 |
| Completion Time: | 45 |
| Attachment: | 200219_140724_D15_start_of_dredge_haul.JPG,200219_172038_D15_grafana_retrieval_of_dredge.JPG |
| Dredge in water 13: | 29 (96.168,-32.01). |
| Start paying out 60m/min 13: | 35 (depth 2291m). |
| Dredge on bottom ~14: | 11. Start paying out wire along dredge line at 30m/min. |
| Target wire laid out 3354m at 14: | 48, ship at 96.180,-32.005. water depth 1432m. |
| Start hauling (15m/min) ;in 14: | 56, wire out 3345m. |
| Tension spikes: | 05. |
| Dredge at surface at 17: | 45. |
| Comments: | We will be using a "stop-and-drop" technique for this dredge D15 deployment. Therefore, some of the above fields are not filled in - there is no fly-in ship-approach used for WP1 to WP2 "run-in" - or may not be valid for the & 39;modelling& 39; intended. The ship is using the current and ship rudder control to drift towards WP2 while the dredge is being lowered. Viewing ship-track data post deloyment will show the approach track. Target dredge start (WP2) is (96 10.113, -32 00.628) Dredge in water 13:29 (96.168,-32.01). Start paying out 60m/min 13:35 (depth 2291m). Dredge on bottom ~14:11. Start paying out wire along dredge line at 30m/min. Target wire laid out 3354m at 14:48, ship at 96.180,-32.005. water depth 1432m. Start hauling (15m/min) in 14:56, wire out 3345m. Tension spikes: 5.7t at 14:57; 5.8 at 15:00; 6 at 15:02; 6.2 at 15:04; 5.9 at 15:06; 6 at 15:08; 6 at 15:10; 6 at 15:12; 6.4 at 15:14; 6.1 at 15:17; 6.5 at 15:19; 6.6 at 15:21; 6.4 at 15:25; 6.24at 15:31; 6.5 at 15:34; 6.2 at 15:37; 7.2 at 15:39; 7.6 at 15:40; 7.9 at 15:41; 8 at 15:42; 7.2 at 15:45; 8.0 at 15:51; 7.9 at 15:52; 8.5 at 15:53; 8.7 at 15:54; 6.9 at 15:58; 7 at 15:59; 7 at 16:01; 6 at 16:14; 9.0 at 16:20; 10.6 at 16:21 - hookup (2056m wire out)...unhooked at 16:27; 10.4 at 16:33 - hookup (1945m wire out); off the bottom 17:02:10 (wire out 1868); hauling in at 60m/min at 17:05. NB. Ship moved down-slope for last hookup so as to unhook. Dredge at surface at 17:42 - on deck at 17:45. |