Hi,
I'm a translator, and I'm currently working on translating a text which involves ROVs, TMSs, tethers and other things that I know very little about. In that respect I have two questions that I hope someone here can help me with (please bear with me here, as I am close to entirely clueless about these matters):
1) In layman terms, what does it mean to reterm a tether?
2) What exactly is going on when a TMS load is "floated"? Actually, what is a TMS load?
I would be extremely grateful for any help.
wesmoe
Member
Joined: Jan 19, 2012
Posted:
03:16 Fri 20 Jan 12
Generally a tether is the electrical cable which goes into the ROV. It carries all the electrical power, signals, video and fibre optics required to operate the ROV.
If the cable is damaged, the tether requires a retermination (reterm)
I'm not sure what you mean by "floating" a TMS. Are you talking about carrying out a load test on a TMS? A TMS is basically an underwater version of the surface winch. The ROV docks into the bottom of the TMS, and the ROV and TMS are lowered to close to the seabed where the ROV then releases and the TMS pays out cable (tether) to the ROV.
The cable from the surface to the top of the TMS (the umbilical) has to lift the weight of the ROV and the TMS. In the water the ROV generally weighs nothing due to its buoyancy. When load testing the launch system and lifting point on the TMS, you have to calculate what the biggest load that will happen to the lift point on the TMS.
Usually, the biggest load is the weight of teh ROV and the weight of teh TMS when they are out of the water.
In deeper diving systems, the biggest weight will be the weight of the TMS (in water) PLUS the weight of the armoured cable which goes from the surface launch system to the top of the TMS (this can be a good few tons)
rayshields
ROVworld Webteam
Joined: Dec 26, 2003
Location: Scotland
Posted:
03:33 Fri 20 Jan 12
"Floating" the TMS is I believe referring to the status of the TMS with respect to the snubber when suspended from the A-frame i.e the TMS is floating when still in the latches but not snubbed up.
Cheers
sitrep69
Member
Joined: Nov 13, 2009
Location: Western Australia
Posted:
04:18 Fri 20 Jan 12
rayshields wrote:
Generally a tether is the electrical cable which goes into the ROV. It carries all the electrical power, signals, video and fibre optics required to operate the ROV.
If the cable is damaged, the tether requires a retermination (reterm)
Greatly appreciated. Thanks!
Quote:
I'm not sure what you mean by "floating" a TMS.
Yes, that's the problem. I don't know what I mean myself, but there is talk of the TMS load being floated in the text I'm working on. Thanks a lot for your help, though.
wesmoe
Member
Joined: Jan 19, 2012
Posted:
04:29 Fri 20 Jan 12
sitrep69 wrote:
"Floating" the TMS is I believe referring to the status of the TMS with respect to the snubber when suspended from the A-frame i.e the TMS is floating when still in the latches but not snubbed up.
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