Gunite and Single Pipe system for Sealine

[Vinzzzz]

Hi i'm vincenzo a material engineer and i'm finding systems for two sealines:
- the first is 10"
- the second 12".

I'm Trying to find some insulating system used for sealines as single pipe configuration.
I have found also some info about five layer system done by the industry socotherm.
Someone can help me to find some system about gunite and polymers for sealine single pipe configuration?
i want to verify this system because i think that gunite is heavier than the single pipe insulated with polymers. this can allow pipe to be submerged by water.
The depth is 110m under the sea.

Thanks for all and best regards.

Vincenzo