Pipe Coating technology process

Pipe Coating technology process

 

Steel pipe anti-corrosion technology methods, standards and process requirements.

 

1. 2PE/3PE anti-corrosion 3PE antisepsis: the pipeline three PE anticorrosive structure: the first layer of epoxy powder (FBE> 100um), the second layer of adhesive (AD) 170 ~~ 250um, the third layer of polyethylene (PE) 2.5 ~~ 3.7 mm. Three of the integration, and combine to form an excellent anti-corrosion layer steel pipe firmly. Diameter range Φ60 to Φ1420 2PE anti-corrosion: the pipe layer PE anti-corrosion structure, the first layer of adhesive (AD), the second layer of polyethylene (PE), two kinds of material integration, the thickness of each layer with three PE same. 3PE anti-corrosion (three polyethylene) process is the introduction of advanced anti-corrosion technology from abroad in the late 1990s, it is called the fusion bonded epoxy / extruded polyethylene structural protective layer. 3PE anti-corrosion technology combines excellent performance, combining the advantages of the interface properties and chemical resistance of epoxy coating with of extruded polyolefin anticorrosive layer mechanical protection properties of epoxy coating with two anti-corrosion layer extruded polyethylene thereby significantly improving their performance. Its characteristics: high mechanical strength, wear resistance, corrosion resistance, heat resistance, cold tolerance, can be applied in a 150-degree media to adapt in the cold zone. Therefore, 3PE anti-corrosion layer the ideal outer protective layer of buried pipelines. According to authoritative testing, 3PE anti-corrosion technology buried pipeline life can be as long as 50 years. 2PE anti-corrosion layer polyethylene pipe layer PE the anticorrosion structure, the first layer of adhesive (AD), the second layer of polyethylene (PE), two kinds of material integration, the thickness of each layer and three-layer PE same. Thus see the difference lies: 3PE anti-corrosion epoxy powder layer, epoxy powder corrosion resistance, good mechanical properties, resistance to cathodic disbondment, although it has strict surface treatment, poor weather resistance, water absorption and high, It is suitable for submarine pipeline buried pipeline coating layer thickness of only 0.3 to 0.5 mm, the service life of up to 40 to 50 years.

 2 prefabricated polyurethane insulation pipe insulation material is a rigid polyurethane foam of density of 60kg/m3 to 80kg/m3, fully fill up the gap between the steel pipe and the sleeve, and having a certain degree of adhesive strength, the steel pipe, the jacket pipe and The insulation layer between the three to form a solid whole. The polyurethane foam has good mechanical properties and the heat insulating properties can resist temperature up to 120 ° C, under normal circumstances, by modification, or other insulation material combinations can resist temperature up to 180 ° C. Pipe insulation of rigid polyurethane foam insulation shell and tube of black material and white material mixed. (1) the main component of the white material is a phosphorus-containing polyether resin, glycerol, polyether resin, ethylene glycol, polyether resin, and also need to add a flame retardant, a foam stabilizer and a catalyst.

 

(2) is the main component of the black feed polyphenyl isocyanate, a purity of 90%.

 

 

(3) outer layer of glass fiber reinforced plastic is a moisture barrier layer in the insulation structure is made of resin-impregnated glass cloth, with a strong resistance to weathering and corrosion resistance, also has a strong hardness 3. Monolayer epoxy powder preservative The single-layer epoxy powder antisepsis nearly 30 years to develop a new type of anti-corrosion layer, electrostatic spraying coating epoxy powder coating, film forming once. The coating has a coating operation is simple, non-polluting, coating, impact resistance and anti-bending performance, high temperature resistance, has been widely used in foreign countries. A single layer of epoxy powder pipeline anti-corrosion steel pipe products used: coal mine: applicable to coal mine water supply and drainage, underground shotcrete, positive and negative pressure ventilation, gas drainage, sprinkler pipe network. Power plants: thermal power plant process water waste, backwater pipelines. Fire: For anti-sprinkler, sprinkler systems, water supply pipeline has excellent applicability. Highway: electricity, communications, highways and other cable protection sleeve. Municipal engineering: Suitable for high-rise building water supply, heating of the heat supply network, water supply projects, gas transportation, Underground Water and other pipelines. Oil: oil pipeline, chemical and pharmaceutical, printing and dyeing industry, process piping conveying corrosive media. Sewage treatment: sewage treatment discharge pipes, sewage pipes and biological pools corrosion engineering. Agriculture: agricultural irrigation pipe, deep well pipes, drains and other networks.

 

 4 2PP/3PP preservative 3PP anticorrosion: pipeline the three PP preservative structure: a first layer of epoxy powder (FBE50 to 100um), the second layer of adhesive (AD) 250 ~ 400um, the third layer of polypropylene (PP) 1.4 to 4.0 mm. Three of the integration, and the steel pipe firmly combine to form an excellent anti-corrosion layer, the use of anti-corrosion layer temperature up to 110 degrees. Diameter range Φ60 to Φ1420 2PP antisepsis: pipeline two-story PP anticorrosive structures: the first layer of adhesive (AD), the second layer of polypropylene (PP), two kinds of material blend, the same as the thickness of each layer and three-layer PP pipe anti-corrosion processing types: 1, petroleum and natural gas with a three-layer polyethylene (3PE) Pipe Coating. Implementation of the standards: SY/T0413-2002 \ DIN30670, oil and gas with FBE (single-layer fusion bonded epoxy powder antisepsis), 2FBE (double-layer fusion bonded epoxy powder antisepsis) Executive Standard: SY/T0315-97. water supply pipelines cement mortar lining of steel pipe corrosion. Implementation of the standards: CECS10: 89 4, water supply pipeline IPN8710. Nontoxic polymer coating steel pipe anti-corrosion.

 

 5, non-toxic coating steel pipe for water supply pipelines epoxy drinking water equipment corrosion.

 

 

 6 coal tar epoxy the wound glass cloth pipe coating. Implementation of the standards: SY/T0447-96.

 

 

 7, various types of heavy-duty coatings pipe coating.

 

 

8,2 PP (second floor polypropylene) the thermal pipe with pipe insulation. (Polyurethane foam insulation layer) other products are epoxy-based coatings such as coal tar epoxy, acrylic, urethane, polyethylene, chlorinated rubber, chloro-sulfonated the classes and IPN8710 nontoxic special coatings of drinking water pipes, etc. a variety of anti-corrosion coatings. Since the mid-1990s, the majority of our major pipeline corrosion using 3PP anti-corrosion coating, 3PE the anticorrosion coatings undoubtedly has become the first choice of our pipeline anticorrosion.

 

But in recent years because of the construction of the Sudan pipeline project, people come to realize 3PP coating. The 3PP 3PE coatings belong to the same multi-layer coating system, jacket constitutes the bonding agent of the intermediate layer and the outer layer by the underlying epoxy powder, PP (polypropylene). PP and PE processing performance approximation, use the a 3PE job 3PP coating line fully able to produce, and do not need to build a special 3PP coating job line.

 

However, the difference in performance of the PP and PE material itself, and the 3PP 3PE coating exhibit a different performance, and thus suitable for different environments. 3PP coating on some performance advantage, enabling it to play a role as the field of 3PE coating, so many foreign pipeline project 3PP anti-corrosion coating.

 

 High density polyethylene jacket tube ene jacket tube uses made of high-density polyethylene jacket tube material has high mechanical strength and excellent corrosion resistance, can protect the pipe due to external factors, transportation, installation and use of the process to avoid damage. The outer tube should be added such as antioxidants, ultraviolet stabilizers, and carbon black. Production

 

1, feeding, extrusion 3 mold finished high-density polyethylene outer sheath tube performance longitudinal reversion tensile yield strength elongation at break density melt flow rate of long-term mechanical properties of the thermal stability of carbon black content corona effect, cooling 5, traction 6, the inner surface of the corona treatment, cutting 8, inspection and testing methods GB/T8004.2 GB/T8004.2 GB/T1033 GB/T3682 GB/T6671.2 GB/T6111 GB / T7391 GB/T3021 DY reagents indicators ≥ 19MPa ≥ 350% ≥ 940Kg/m3 0.5g/10min ≤ 3%> 1500h> 20min 2.5 ± 0.5% ≥ 50DYn/cm