Anyway, current installation has only one pump, and has to produce the same pressure difference.
For 41m pipe, Reynolds number 75000, turbulent case, by quick calculations I got about 50 bar.
It may be usefull to use two different compressors. On finishing, depending on surface tension, some...
Even if somehow you will manage to create such cylindrical beam of electrons with equal positive ions inside (which seems practically impossible), recombination energy will be to high and lead to sputtering as ions, atoms and small molecules.
Sorry, mean blowing very thin wire by capacitor discharge, not just heating. The inert gas pressure needed to make Pt atoms diffuse into shadowed parts of reactor instead of direct beam epitaxy like in high vacuum. And to avoid forming aerosol like it would be in higher pressure atmosphere.
B will just increase energy dissipation, thus the perfect material for B is vacuum (an air is also good).
All you can do is to find best material for A. (superfluid liquid helium is the best, but I suppose is not suitable for your design), pure monocrystals would vibrate longer
If you can afford to spend dozen of thousands for this, try to reproduce some extraordinary material, ie aerogel, nanotubes, diamond, high-temperature superconductors, etc.
Those technologies are quite documented, but not yet in the mass production stage.
Thus, it will give you the real...
For the purpose of armor, CNT based composite, I think, would be the best solution, but extremely expensive.
But not sure it's good idea to use them for artificial muscles in exosceleton. As it said by the link you provided, 'muscle' is made of aerogel based (very rarefied) oriented nanotubes...
For example, there are two blocks connected with the spring/rubber medium. After a shot shake, those blocks stay motionless, but the medium still vibrate for some time. Is this kind of design do you mean?
I suppose it's not that easy to cover it manually, if HCl would go through valves and etc.
What I would suggest, is to deposit protective film from vapor phase.
Ultimate long-term solution would be to heat thin platinum wire inside reactor in atmosphere of 10-100 Pa of inert gas.
Please convert picture from bmp to gif/jpg before posting, it will save a lot of traffic.
Didn't get idea of your design.
Do you mean particular types of plastic, to test, whether it will degrade in open ocean environment?