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Post by Chris on Oct 19, 2015 17:08:53 GMT
Not my pics but a pals. Shows the rig parking up in Invergordon.    Something a bit different! |
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Post by MartinT on Oct 19, 2015 19:26:57 GMT
Astonishing that they can be mobile at all. What sort of tug power is used to pull them?
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Post by Chris on Oct 19, 2015 20:22:08 GMT
The rig has its own power Martin - 6 Rolls Royce thrusters. These would have been used to move it from location (West of Shetland) to just outside Invergordon then the tugs take over for final positioning. The tugs can generate huge horsepower. Don't know the exact figures but I saw one being tested once and it was coupled to a harbour wall with a load cell in there to measure the forces generated. They had to stop the test as it was going to pull the wall apart.
For rig moves the speed is between 4-6 knots and displacement is around 27000 tons.
The really astonishing bit is how they maintain stability - that's the thrusters that do that as well.
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Post by MartinT on Oct 19, 2015 21:09:14 GMT
Impressive!
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Post by Chris on Oct 19, 2015 22:18:10 GMT
Sorry Martin - 8 thrusters! Here's a dashboard pic showing them running flat out. Very,very rare.  |
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Post by MartinT on Oct 20, 2015 5:42:56 GMT
I don't suppose there's a problem having enough fuel...
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Post by Chris on Oct 20, 2015 7:00:42 GMT
Fuel consumption is immense. A regular fuel stop sees us bringing on maybe 500 cubic litres of fuel!! Takes hours. We have been close to low fuel as during the winter months the supply vessel couldn't get in .
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Post by jandl100 on Oct 20, 2015 7:04:33 GMT
Amazing photos! I had no idea that's how it worked. Thanks Chris.  |
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Post by MartinT on Oct 20, 2015 7:59:30 GMT
Wassat, then?  |
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Post by Deleted on Oct 20, 2015 9:03:40 GMT
That is a lot or iron to keep stable an impressive use of human ingenuity  |
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Post by MartinT on Oct 20, 2015 10:31:38 GMT
That display reminds me of the Bug Head interface. Only it's less complex  |
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Post by Chris on Oct 20, 2015 11:57:50 GMT
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Post by MartinT on Oct 20, 2015 13:01:20 GMT
Never mind. You said "cubic litres"!
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Post by jandl100 on Oct 20, 2015 16:03:41 GMT
You need to be in a parallel universe which has 6 dimensions rather than the mundane, boring 3 that we have to manage on to have cubic litres, I think.  |
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Post by ChrisB on Oct 20, 2015 16:46:36 GMT
If you cubed a cube would you not have nine dimensions Jerry?
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Post by jandl100 on Oct 20, 2015 19:13:33 GMT
Errr ... not sure! But I think you add them rather than multiply them.  You just need the 3 extra dimensions that the cubing requires. Maybe. |
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Post by John on Oct 20, 2015 19:22:30 GMT
That display reminds me of the Bug Head interface. Only it's less complex Lol |
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Post by MikeMusic on Oct 21, 2015 14:21:57 GMT
Bug Head makes DOS look simple |
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Post by Chris on Oct 25, 2015 6:43:41 GMT
The control system is built by Kongsberg who diversified a little from making missiles. Quite a few of the guys here would be highly impressed with the sensitivity and precision of their electronics.
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