a three-layer field joint coating system for pipeline operating temperature separately at 50 . JYHT50, JYHT60, JYHT80 is ... a three-layer field joint coating system for pipeline operating temperature separately at 50,60,80, which consists ... wraparound HSS and a Closure Patch. The system is compatible with line coatings for PE, FBE, Coal Tar, Tape & Asphalt. Radiation Crosslinked ...