1: airborne method: the installation and cleaning personnel first remove the top and bottom sections of the pipeline. This method is mainly used to clean the vertical flue over 51 cm. Fix the safety rope at high altitude above the flue, fasten the safety belt, and install the cleaning personnel to clean the oil in the vertical flue from top to bottom. This method is dangerous, technical, costly and effective. Because the vertical flue generally has less oil accumulation and can be cleaned once a year.
2. Manual entry method: the labor intensity is relatively high, and the parallel flue larger than 41cm square can be cleaned by manual drilling. Need to pay attention to strengthen ventilation, equipped with low-voltage (36 volts) lighting power supply.
3: Dismantling method: this method is used when manual access is impossible, and when the flue is less than 41cm square. According to the actual situation of the site, the installation and cleaning personnel dismantle a section of flue at regular intervals and extend it to both sides for cleaning. This method has good effect, great difficulty and high cost.
4: opening method: the installation and cleaning personnel use a special spark-free opening tool to open one or more holes in the pipeline. This method is used for the flue which cannot be accessed manually and is difficult to disassemble. The size, interval and number of openings depend on the site conditions, and the pipeline will be sealed and restored after the oil pollution is cleaned.
5: the flue with short cleaning cycle is cleaned by this method, that is, the mechanical equipment cleaning method, which has less oil pollution. First, spray cleaning agent into the pipeline to soften the oil stain, and then use a 31-meter-long electric flexible shaft brush to clean the oil stain. This method is used in vertical flue with a square of 31 cm, and hidden small flue which is inaccessible and inconvenient to disassemble. This kind of oil is not easy to clean and easy to accumulate, so the cleaning cycle should be shortened.