自19世纪末期以来,美国已铺设了十二万多公里的铸铁管煤气管线。为了使这些管线继续运行,采用了20世纪60年代末发明的“内壁清管堵漏”的新技术。该技术以“煤气塞(gasloc)”的名称申请了专利。在清除管内脏物后用一种专用设备,在电视机的监视下把一种以聚(乙)硫橡胶LP为基料的环氧树脂涂在内壁上,24小时后树脂凝固,管线漏泄处堵塞,修复后可耐压7公斤/厘米~2。 Since the late 19th century, the United States has laid more than 120,000 kilometers of cast iron gas pipelines. In order to continue the operation of these pipelines, the new technology of “interior wall pigging and plugging” was invented in the late 1960s. The technology was patented under the name “gasloc.” After clearing the internal filth of the tube, a special equipment was used to coat an epoxy resin based on poly(ethylene)thiol rubber LP on the inner wall under the supervision of the television. After 24 hours, the resin was solidified, and the leaked line was leaked. Clogging, after repair can withstand pressure 7 kg / cm ~ 2.