subsea equipment - cable tray for "spare" cables

[VladimirWH]

Hi!
Designing a subsea gathering manifold ("GM"), with 10 cluster manifold ("CM") connection, I find out difficulties with cable tray configuration. For better understanding:
[ul]
[li]gathering manifold has a typicaly cable tray system ("A" system) which is placed "inside" of it[/li]
[li]gathering manifold has a spare cable tray system ("B" system) which is placed "outside" of it[/li]
[li]"B" system need to have opportunity replace "damaged" cable which is placed in "A" system[/li]
[/ul]
The main problem is to count cables which need to replace. I have already had a 20 electrical cables and 16 optical inside GM but I think it's a dumb decision to replace them all (+size of "B" system will be huge)
Let's skip who I am and why I am doing this. А customer, operator and anybody else don't want to think about it. I just want to find "best practise" or some argument.

 

[LittleInch]

So if I understand you right you're designing a new manifold with allowance for repair/replacement of cables after installation on the seabed?

So is it diver depth?

Essentially a risk based decision about how many cables actually might need replacing vs impact of not having enough space in your cable tray.

Only operators will have that information.

What exactly is the down side here?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.