Usually priced in meters, it is divided into horizontal pipes and vertical pipes. Vertical pipes are more difficult to clean than horizontal pipes. In addition, the amount of oil accumulated in the pipeline, the length and diameter of the pipeline will affect the price. The more oil accumulated, the higher the charge, and the longer the pipeline, the lower the charge. The smaller the pipeline, the lower the charge (excluding the pipeline that people can't get in). Changsha horizontal pipe 50- 120 yuan one meter, vertical pipe 150-200 yuan one meter.