中洛线采用的是5 LX-52直缝钢管,外包泡沫塑料和聚乙烯黄夹克管,其保温效果较好。至1987年2月,投产输油已两年。 该线施工时的试验压力为10MPa(100kgf/cm~2),为适应油田的增产和炼厂扩建的要求,曾设想提高输油压力以增加输量。当输油公司在李源屯换管时发现保温泡沫可挤压出水,而且钢管已有明显腐蚀,高压输油已成问题。1987年2～7月,管道局组织有关部门对腐蚀情况先后进行了三次不同规模的现场挖坑调查。 Luo line is used in 5 LX-52 straight seam steel pipe, polyethylene foam jacket and polyethylene jacket, the insulation effect is better. To February 1987, put into operation for two years oil. The test pressure during the construction of the line is 10MPa (100kgf / cm ~ 2). In order to meet the requirements of oilfield production and refinery expansion, it has been envisaged to increase the oil pressure to increase the output. When the oil company in Liyuan Tuen found that foam can be extruded insulation foam, and the pipe has been significantly corroded, high-pressure oil has become a problem. From July to July 1987, the relevant departments of the Pipeline Bureau organized three on-site digging surveys on the corrosion situation.