I'm trying to roughly estimate dimensions and masses of propellant and pressurant ducts for conventional upper- & transfer stages.
My basic approach follows Barlow's formula for cylindrical vessels (hoopstress), but that results in wall thicknesses that seem very small.
Example: A stainless steel pipe with a diameter of 30mm and a pressure of 12bar(~175psi) would only have a 0.1mm wall.
My usual sources for the preliminary design of propulsion systems (Huzel/Huang, Sutton/Biblarz, Humble/Henry/Larson) unfortunately don't cover that topic.
Therefore I'm asking if you could recommend some links, papers or books with reliable, "rocket-related" information or best practices for dimensioning pressurant and propellant ducts.