六十年代以来,美国发展用管道长途输送液氨的技术。目前有两条液氨管线在运行,总长度约5,000公里。其中最长的一条是由海湾中央管道公司经营的,长度达3,200公里。该管线从墨西哥湾延伸至中西部地区的玉米带,于1968年开始建设,一年以后建成。 Since the 1960s, the United States has developed the technology of transporting liquid ammonia by long-distance pipelines. There are currently two liquid ammonia lines in operation, with a total length of about 5,000 km. The longest one is run by the Gulf Central Pipeline Company, which has a length of 3,200 kilometers. The pipeline, which stretches from the Gulf of Mexico to the midwestern corn belt, began construction in 1968 and was completed a year later.