During the CS Tyco Durable’s laying programme, she will have to launch the four branching units (“BUs”) that will allow PIPE International to expand the system. This sounds relatively easy but the logistics are fairly complicated. A BU has three legs: Trunk, A1 & A2. Therefore it has 3 cables that need to be managed. This means that it cannot leave via the Linear Cable Engine (“LCE“) which can only handle a cable in a straight line.
And so starts a process of swapping the cable from the LCE to the Cable Drums (pictured) and from there controlling the payout of all three cables to ensure that the BU doesn’t twist as it is being deployed. The three cables need to land in the correct orientation or you will end up with crossed legs.
The whole process takes several hours and includes a few stops and starts and winding cable on and off the Cable Drums as the BU passes down the ship. Once it gets to the end of the highway it has to be transferred out on to a trolley for its trip along the aft deck. The 10T crane is also called in at this point to help with the manoeuvrers. With the cables no longer on the drum engines the crew apply a series of stopper and chains to take the tension and stop the BU making a bolt for the seabed too quickly. At each step of the process, the stoppers are moved down the deck to keep everything safe and under control.
Once the trunk leg of the BU (which is always the last to leave) is overboarded, a hatch opens in the rear wall of the Highway to allow the cable to be transferred back to the LCE. With this done, everyone prepares to continue the main cable laying.
As of Thursday 22rd July the Tyco Durable is at latitude 16 degrees 46.88 minutes south as seen from the figure above. The lay is now going extremely well and we hope to lay BU3 before the weekend. Once this is complete the vessel will finish off the installation with a run to the BU4 position off Madang. Current plan is for a final splice around 20th August 2009.
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Daniel - not sure that map is terribly accurate. Suggest instead: http://www.sailwx.info/shiptra...call=V7DI8
Durable real time tracking
most vessels submit gps co-ordinates via aprs when they are within range of a ham antenna
This photo is the S1.1 joint going over after we had recovered the buoy.
The Tyco Durable is currently back in port in Sydney. After all repairs are complete and we have our new plough team on board we will complete the remainder of the burial of S1.1 off Sydney. We will then inspect and post-lay bury as required the Sydney shallow water cable. We expect this (with no weather delays) to take less than a week to complete and then we will continue laying from Brisbane north.
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Keep up the good work Pipe! This is easily the best blog I read.
It has been an interesting few weeks for the Tyco Durable as we lay the remaining portion of PPC-1 up the Australian coast. We have had some tricky weather for ploughing, namely a severe storm on 21st May. As some of you may be aware, we have had some equipment problems, specifically the large tow winch for the plough needs spare parts and major repairs in order for us to complete the ploughing off Sydney.
Despite these setbacks we have continued on and have laid BU1 off Sydney and all of the cable between Sydney and the BU2 location (Brisbane). We are currently 170km to the east of the Brisbane CBD streaming the last of the segment from Sydney.
The plan is for the ship to return to Sydney today to complete the winch repairs and then the remaining Sydney burial works before returning to pick up where we have left off and continue the final parts of the lay up to the final splice position off Madang.
Photo courtesy of James Freeman of the Nautical Association of Australia
CEO Bevan Slattery’s speech at the Australian PPC-1 Landing. The press conference took place in a marquee in Plateau Park in Collaroy. Minutes before, VIPs, press and guests witnessed the cable being winched through the beach manhole after landing into the borepipe and onto Australian shores.
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It seems strange that the questions were cut, doesn't make it as easier to determine what Bevan is answering.