1) work steel pipe Type of steel pipe (optional): seamless fluid pipe and submerged arc welded spiral steel pipe. 2) insulation layer Material types (optional): asbestos free microporous calcium silicate, high temperature centrifugal glass wool, aluminum silicate, nano aerogel, rock wool 3) jacket steel tube Type of steel pipe (optional): submerged arc welded spiral steel pipe and longitudinal welded pipe. 4) external anticorrosion coating Anticorrosion type (optional): five oil three cloth, polyurea spray, 3PE, epoxy resin, soluble epoxy powder. |