Anticorrosive pipes are widely used in the production of epoxy coal tar pitch anticorrosive steel pipes. Anticorrosion technology is a process that the outer wall or inner wall of steel pipe is covered with anticorrosive coating to protect the pipeline itself. Straight seam steel pipe, spiral steel pipe and other pipes can be processed. In order to prevent people's death and property loss caused by the transportation of flammable and toxic fluid, the spiral steel pipe plant adopts corresponding process standards to continuously meet the important performance operation and use the quality safety in the market during the detection and measurement process. The common steel pipe will be severely corroded in the bad use environment, which will reduce the service life of the steel pipe. The service life of the anti-corrosion and heat preservation steel pipe is also relatively long. Generally, it can be used for about 30-50 years, and the correct installation and use can also reduce the maintenance cost of the pipe network. The anti-corrosion and heat preservation steel pipe can also be equipped with an alarm system Dynamic detection of pipe network leakage fault, accurate knowledge of fault location and also automatic alarm.
Epoxy coal tar reinforced anti-corrosion steel pipe credit first
Epoxy coal tar pitch anticorrosive steel pipe has been used as anticorrosive coating of underground pipeline for nearly a hundred years. However, it is necessary to fully adapt to the laying operation under the harsh conditions from the steel pipe surface coating to the long-distance transportation of elm at the construction site and cold zone, especially for the operation, the temperature rise up to 80. The coating of C's human diameter steel pipe, from the aspects of strong towel and chemical stability of coating materials in a wide range of temperature, has its own extension. In recent years, due to the rapid development of polymer chemistry, the coating materials with superior corrosion resistance are provided for the deep processing of steel pipes. As a coating material, polyethylene coating has not only good chemical stability, but also strong impact resistance, high resistivity, low permeability to oxygen and water and wide temperature range. At present, the newly developed polyethylene coated steel pipe just meets these requirements. In order to meet the requirements of different conditions, high-density polyethylene, low-density polyethylene and modified polyethylene were developed for coating materials. Coating method of polyethylene coated steel pipe. Polyethylene coated steel pipes are usually divided into inner wall coating and outer wall coating. The coating process of polyethylene resin can be divided into extrusion process and melting process. The melting method is often used for the inner wall of small-diameter steel pipe and elbow, while the extrusion method is suitable for the coating of the outer wall of large-diameter steel pipe. Coating of outer wall of large diameter steel pipe. The outer wall of large-diameter steel pipe is usually coated by extrusion. The utility model mixes the granular polyethylene with a screw extruder with a screw groove, extrudes it with an extrusion die after melting, and paints it on the outer wall of the steel pipe. According to the shape of extrusion die, extrusion method can be divided into circular extrusion and flat extrusion. The former is to extrude the molten polyethylene into a cylinder shape from the annular gap of the extrusion die. This coating method mostly uses small-diameter steel pipes. The flat extrusion die is suitable for the coating of large-diameter steel pipes, which is characterized by extruding the molten polyethylene resin into a strip from the straight-line flat die seam of the extrusion die machine, and coating it on the outer wall of the steel pipes rotating and advancing on the inclined roll, forming the thread state and several times of overlapping and winding coating.
The water supply inner and outer plastic coated steel pipe is a new type of composite pipe specially developed for water supply and drainage. The composite pipe combines the characteristics of various pipes, including the steel degree and hardness of the steel pipe, as well as the wear resistance, corrosion resistance and small friction coefficient of the plastic pipe. It is a green and energy-saving pipe with high cost performance. It is widely used in the fields of industrial water supply and drainage, domestic water supply and drainage, sea water treatment, HVAC circulating water, chemical fluid transportation, etc., and is called "high quality green building materials". There are three common methods for the connection of plastic coated steel pipes, which are screw connection, flange connection and groove connection. Screw thread connection is a traditional form, which is mostly used between dn15-100. The connection technology is divided into several steps, such as threading, deburring, chamfering of plastic lined pipe, cutting, screw anti-corrosion and connection. The length of threading is different according to the use of pipe fittings, but one thing is the same, that is, it is necessary to touch the silicone rubber at the end face and root of the pipe, and conform to the shape to become a secondary seal. The pipeline device with working pressure ≥ 1.6Mpa can be applied. The advantages of screw connection are low cost, simple and convenient operation, but it is easy to be limited by the caliber. Flange connection is a relatively good method of connection. However, due to its good cost, it has been gradually replaced by other methods of connection, which are mostly used in chemical industry. In practice, the lining plastic material must be connected with the flange end face, and the fluid in the pipe is completely blocked from the steel pipe, so as to be safe and reliable. Flange connection can be applied to all kinds of pressure pipes.
Epoxy coal tar reinforced anti-corrosion steel pipe credit first