High-Temp Piping Insulation

Hi, I have a "situation" someone might be able to advise me about: 8-inch steel pipe, located outdoors, carries natural gas at 900 psi, 650 degrees F. The piping needs to be substantially insulated for economy and to maintain process integrity, yet the insulation needs to be either in the form of a coating, or fairly easily removable every 3 to 5 years to allow inspection of the pipe for presence of atmospheric corrosion (DOT requirement). Original design was rigid calcium silicate (I think) and we are now using blankets, which are removable, but provide less-than-satisfactory insulation. I hear there are paint-on coatings which can serve this purpose and, because it is a coating which bonds to the pipe, it would not be required to be removed for inspection. Any advice/experience will be appreciated. Received on Wed Oct 08 14:35:00 2003