Pipeline failure and maintenance-13

Release time:

2024-05-03

What are the methods of pipeline repair technology?

2) NPIC method: the basic research of this method is carried out by the metalworking discipline of Osaka University, the development of equipment is carried out by the Japan technology development center, and the improvement of surrounding technology and the development of business are promoted by the Japan light metal association and NPC Pipeline Association.

The construction procedure of spice method is: A. ventilate and dry the piping to make the rust brittle and form a state of easy removal. B. Using high-speed rotating air flow, the abrasive material is sent into the pipe for grinding and derusting. This kind of grinding can not only remove the rust in the straight pipe, but also in the elbow. Due to the small power required, the noise of the compressor is also small. C. Clean with high pressure water, remove the abrasive materials and rust, blow dry to ensure the bonding strength of the coating. D. The coating is made of epoxy resin by using high-speed rotating air flow to continuously coat the pipe wall. During the coating, a certain proportion and coating speed shall be maintained to ensure the formation of uniform coating. After the coating process is completed, the following inspection shall be carried out: coating pinhole inspection by high voltage method, coating thickness inspection by ultrasonic thickness meter, coating hardness inspection by pencil with hardness of H, water leakage, water pressure inspection and water quality inspection by pressure water with 1.2 times of working pressure.

3) Vacl method of p.c.g.vacl is composed of four English words of vacuum, air, clean and lining. It basically represents the construction procedure of this method, that is, coating after drying, grinding with sand, rust removal and air cleaning. These processes are all carried out under negative pressure. A dust removal device is connected to one end of the repair pipe, one side draws out the air in the pipe, the other side draws the coating from the other end of the pipe into the pipe and applies it on the pipe wall. The coating used is epoxy resin (trade name is p.c.g coating material).

This method has the following characteristics: A. It's more economical than replacing new pipes; B. It's almost no damage to buildings; C. It can eliminate rust water and insufficient flow; D. It's cheaper than adding antirust agent; e. it can be coated on special-shaped pipes, elbows, straight pipes of different diameters and joints; F. it's energy-saving without compressor; h. It's negative pressure and has no damage to old pipes; I. the coating has no pinholes.

(2) Slide coating air flow coating method is suitable for the coating of small diameter pipeline. For the pipeline with diameter larger than 100mm, multiple compressors are needed, which is limited by the construction site. In addition, there are noise problems. The slide coating method can overcome the disadvantages of the air flow coating method.