PRODUCTIONOFNEWTYPESELF－COMPENSATINGSPIRALWELDEDPIPESFORHEAT－SUPPLYPIPELINE具有隔热隔液层的新型自动补偿螺旋焊管（CK管）与普通螺旋焊管的显著区别是，当发生热膨胀变形或土壤松动时，沿管道全长可以均匀自动补偿。采用CK管每年可敷设300km供热管线。CK管直径可达250 PRODUCTIONOFNEWTYPESELF-COMPENSATINGSPIRALWELDEDPIPESFORHEAT-SUPPLYPIPELINE The remarkable difference between a new self-compensating spiral welded pipe (CK pipe) with a thermal barrier layer and an ordinary spiral welded pipe is that it can be uniformly and automatically compensated along the entire length of the pipe when thermal deformation or loose soil occurs. The use of CK pipe laying 300km heating pipelines each year. CK tube diameter up to 250