On 05/21/2008 fred posts: Hi, I need assistance with carbon dioxide time lag and permeability in multilayer plastic coating on stainless steel. Is there a simple analytical solution for carbon dioxide lag time and permeation for a 2 or 3 layer material (in case of an outside pipe coating)? Furthemore, we have access to GC and High-performance liquid chromatography (HPLC) can this equipment be useful for ASTM D1434 permeation validation measurements?
Thanks,
Fred

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On 05/12/2008 r.j. philips posts: I have a similar question, but then with regard to hydrogen sulfide (H2S)diffusion and chemical degradation. Since in some parts of the world, H2S content of oil reservoir fluid is rather high. Is H2S a problem for polymer cover seals, spoolables and insulation from the viewpoint of corrosion and diffusion rate/coefficient. What is the time lag of H2S in a PTFE O-ring of 5 mm cross sectional diameter or a internal polyethylene liner / coating of 2.9 mm?

Rgds,

Ron
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