Speaking from experience in Europe, we found it more efficient and cost effective to use Al foil to wrap the pipe - 50% overlap,only primer paint applied. After that you need to make sure that your contractors have all Al or S/S final wrap joints on the underside.Keep a constant eye on the insulation contractors! Seals at vessel entries are the real pain in the proverbial as a lot of them are out of ground-level inspection. As to the inspection, we used a bought-in criticality rating programme to rank the pipework, etc. Unless you do this there is no hope of achieving sensible inspection results. Most of what I have sais is well publicised in trade journals. At the end of the day it is a damage limitation exercise - not a Utopian dream! After installation, most damage is done by the use of pipework as walkways during mtce programmes.