The flange connection of plastic-coated steel pipes is to weld the flanges on both ends of the steel pipe first, then shoot blast the inside and outside to remove rust, and then spray epoxy resin powder inside and outside. The plastic-coated steel pipes for water supply are suitable for the working environment of -30℃-120℃, Compared with other metal pipes, plastic pipes, and composite pipes, it summarizes the characteristics of various pipes, including the strength of steel pipes and the corrosion resistance, wear resistance, and low fluid resistance of plastic pipes. It is a safe and hygienic strength High, green pipe with good bonding strength.
Flange-connected plastic-coated steel pipes are much better than other pipes lined with plastic, rubber, hot-dip galvanizing, and other aspects in terms of pipe service life and specific functions such as rigidity, impact resistance, corrosion resistance, and resistance to rust and scaling. Plastic-coated steel pipes are mainly divided into two types: internal plastic-coated steel pipes and external plastic-coated steel pipes. The coating materials usually use epoxy resin and polyethylene, and can also be customized according to customer requirements. Plastic-coated steel pipes have effectively solved the shortcomings of previous steel-plastic composite pipes in production and equipment, and have been well-received and recognized by many customers. The state has made clear regulations on plastic-coated steel pipe fittings. The cross-section of steel-plastic composite pipes must not be in contact with water. Non-plastic-coated pipe fittings must not be used instead of plastic-coated pipe fittings. Pipe fittings coated with plastic inside malleable cast iron pipe fittings must not be used. Convex necked steel pipes There should be an injection molded interface in the flange, special transition pieces should be used to connect with the valve thread, special transition pieces should also be used to connect with the water supply plug, and special rubber sealing rings should be used for the grooved connection. The seals used for grooved connections for plastic-coated steel pipes are different from those used for general non-plastic-coated steel pipes. The rubber sealing ring used for the grooved connection of plastic-coated steel pipes not only seals the water-stopping function of the joint between the steel pipes but also blocks the contact between the plastic-coated steel pipe section and water to prevent corrosion. In the actual construction process, no plastic-coated pipe fittings matching the plastic-coated steel pipes were used for the connection between pipes or the connection between valves and pipes, but ordinary grooved parts were used.
Internal and external plastic-coated steel pipes are steel-plastic composite pipes that are made of welded steel pipes as the base material and adopt processes such as sandblasting and chemical dual pre-treatment, preheating, internal and external coating, curing, and post-processing. It has excellent comprehensive properties, strong corrosion resistance and mechanical properties, good chemical resistance and water resistance, and has the functions of drag reduction, anti-corrosion, pressure resistance, and antibacterial. It is generally not restricted by the transmission medium, and the plastic coating layer has a strong bonding force with steel. Coating material: Epoxy resin (EP) is suitable for working environments below 80°C. The steel pipe coating has extremely high adhesion, high hardness, good impact resistance, and good chemical corrosion resistance.
High-temperature resistant plastic coated steel pipe is a layer of plastic material coated on the inner and outer surfaces of the steel pipe. It tightly combines plastic and steel pipes and is a product that combines the characteristics of plastics. On this basis, fire-fighting epoxy resin steel pipes are made of plastic-coated materials with fire-fighting properties. Fire-fighting epoxy resin steel pipe is a plastic-coated steel pipe specially used for fire-fighting, and its plastic layer is also strictly implemented by national standards. Fire protection has high requirements on the plastic layer of plastic-coated steel pipes:
First, it must be flame retardant.
Second, it must have a high-temperature resistance of 300° for one hour without significant changes in the plastic layer. No blistering, peeling, or swelling. No peeling, no cracking, no damage, etc. requirements.
Third, the outer surface should be red. And there should be clear and durable markings on the outer surface. The marking content should at least include product specifications and models, specification wall thickness of the base pipe, implementation standards, production company name or brand trademark, and production date or batch number.
Fourth, the coating layer should be smooth and flat, without defects such as cracks, pinholes, or adherent foreign matter.
Fifth, it can be coated internally and externally. When coating internally, the outer surface can be made of red anti-corrosion material.
Post time: Mar-21-2024