I have a question about module walls on the ISS. I know they are about 10cm thick. It's two layers of aluminum with a gap in between to act as a whipple shield. Are those walls just to "keep air inside" and "act as a shield against MMOD" or are they "crammed with electronics"? Are there, for example, tubes with coolant, sensors, distribution lines and so on?
No, the MMOD shield is just panels placed on the exterior of the module hull. There isn't anything "stored" between them.
Why is the inside of the module grey-green?
Experts, please correct me if I am wrong.It's primer.
This specification covers chemical conversion coatings formed by the reaction of chemical conversion materials with the surfaces of aluminum and aluminum alloys...coatings...[can be] iridescent yellow, brown
Type I – Compositions containing hexavalent chromium [coating has color]
Class 1A chemical conversion coatings are intended to provide corrosion prevention on unpainted items as well as improve adhesion of paint finish systems on aluminum and aluminum alloys. Coatings of this type may be used, for example, on tanks, tubing, and component structures where paint finishes are not required for interior surfaces but are required for the exterior surfaces.
And is there something on the inside of the pressure vessel?
Everything is inside of the pressure shell. Especially, since it is not on the outside.
Is it that fact that there are four of those standoffs 90 degrees apart that have all the utilities plumbed through them. The racks then attach to the standoffs.
On the image below you can see the outside is the Whipple sheild, the MLI and Kevlar layer, then finally the pressure vessel with the orthogrid.
