3PE anti-corrosion steel pipe

3PE anti-corrosion steel pipe

Epoxy coal asphalt anticorrosive steel pipe is a kind of anticorrosive pipe widely used in petroleum, natural gas, chemical industry, water supply and drainage and other fields. 3PE anti-corrosion steel pipe is a kind of anti-corrosion pipe commonly used in China, and the parent material includes seamless steel pipe, spiral steel pipe and straight seam steel pipe. Combining the advantages of epoxy resin and polyethylene materials, it has high impermeability and high mechanical properties, and is globally recognized as the best anti-corrosion coating for pipelines with the best use and performance.

The parent material of 3pe anticorrosion steel pipe includes seamless steel pipe, spiral steel pipe and straight seam steel pipe. The three-layer structure of polyethylene (3PE) anti-corrosion coating with its good corrosion resistance,

3PE anti-corrosion coating is widely used in the petroleum pipeline industry for its good corrosion resistance, water and gas permeability and mechanical properties, etc. 3PE anti-corrosion steel pipe a corrosion layer for the life of buried pipelines is crucial.

Said to be vital, the same material of the pipeline, some buried in the ground for decades without corrosion, there are a few years on the leakage. It is because they use different external anti-corrosion layer.

The company can undertake the steel pipeline (steel pipe, pipe fittings) of the single-layer and double-layer fusion bonded epoxy powder (FBE), double-layer polyethylene anticorrosion (2PE anticorrosion steel pipe) and three-layer polyethylene anticorrosion (3PE anticorrosion steel pipe), double-layer polypropylene (2PP anticorrosion steel pipe) and three-layer polypropylene (3PP anticorrosion steel pipe), coal-oxygen asphalt steel pipe anticorrosion, epoxy resin corrosion-resistant steel pipes, IPN8710 high molecular Anti-corrosion coating anti-corrosion (IPN8710 drinking water pipeline), cement mortar lining anti-corrosion, polyurethane prefabricated buried thermal insulation pipe, black and yellow jacket thermal insulation pipe, steel jacketed thermal insulation steel pipe, prefabricated buried pipe fittings heat preservation and anti-corrosion and other projects.

Implementation of SY/T0447-96, GB50268-97, CECS10:89, DIN30670, DIN30671, SY/T0413-2002, SY/T0315-97 standards.

Details of 3PE anti-corrosion steel pipe

Component material: The parent material of 3PE anti-corrosion steel pipe includes seamless steel pipe, spiral steel pipe and straight seam steel pipe .

Anti-corrosion structure:

Outer layer: composed of three layers, the first layer is epoxy powder (FBE>100um), which has good anti-corrosion performance and can effectively prevent the surface of the steel pipe from being corroded .
Intermediate layer: it is adhesive (AD), the thickness of which is usually in the range of 170-250um, which plays the role of connecting the epoxy powder layer and the polyethylene layer to make the three-layer structure more closely combined.
Inner layer: polyethylene (PE), thickness of 1.8-3.7mm, with good resistance to water and gas permeability and mechanical properties, can protect the steel pipe from the erosion of the external environment.

Performance characteristics: 3PE anti-corrosion coating combines the advantages of epoxy resin and polyethylene materials, with high impermeability, high mechanical properties, is recognized worldwide as the best use of the best performance of the pipeline anticorrosion coating .

Processing method: generally divided into winding type and round mold wrapping type.

Application areas: widely used in petroleum, natural gas pipeline; urban water supply and drainage, heating, gas transmission pipeline; coal mine underground water supply and drainage, ventilation, gas pumping and other pipeline networks; thermal power plant process water slag, backwater pipeline; fire sprinkler, sprinkler system water supply pipeline; electric power, communication, highway cable protection casing; high-rise building water supply, heat network heating, water supply projects, gas transmission, buried Water pipelines; petroleum pipelines, chemical and pharmaceutical industries, printing and dyeing and other industries to transport corrosive media process piping; sewage treatment discharge pipe, sewage pipe and biological pool anti-corrosion project; agricultural irrigation pipe, deep well pipe, drainage pipe and other networks.

Specific construction process of 3PE anti-corrosion steel pipe

I. Surface pretreatment

Degreasing: Remove grease and dirt from the surface of steel pipe.
Inspection: Check the surface condition of steel pipe and record the relevant information, and deal with the unqualified steel pipe separately.
Preheating: Heat the steel pipe to 40～60℃.
Shot Peening and Descaling: Make the surface cleanness of steel pipe reach Sa2.5 standard.
Surface inspection: Check the quality, cleanliness and depth of anchor grain of the descaled steel pipe, and return the unqualified steel pipe for treatment.
Vacuuming inside the pipe: Remove steel shot and dust inside the pipe.
Pipe end reservation: apply coating after sticking paper, and cut off the reserved section manually after completion.

Second, steel pipe surface coating

Dust removal: Remove the tiny dust on the surface of the pipe after rust removal.
Medium-frequency induction heating: Heat the pipe body to the required temperature.
Epoxy powder spraying: evenly spray epoxy powder on the surface of steel pipe and gelatinization.
Side-wrapped copolymer primer: Wrap copolymer adhesive on the gelatinized powder layer.
Side-wrapped polyethylene tape: Wrap polyethylene tape on the powder and copolymer adhesive layer.
Water cooling: Cooling and hardening of the coated steel pipe.
Pipe end treatment: Remove the anticorrosion layer from the reserved part of the pipe end and form chamfer.
Anti-corrosion pipe testing: test the quality of anti-corrosion pipe and record the information, unqualified pipe for disposal.
Repair of external anti-corrosion layer: repair the anti-corrosion layer according to the standard.
Marking of finished external anticorrosive pipe: spray the mark on the end of the pipe and stack it.

Third, patch construction

Pipe opening cleaning: clean up oil and other impurities on the weld opening and anti-corrosion layer on both sides, and polish the weld seam and nearby defects.
Surface treatment of nozzle: sandblast rust removal up to Sa2 level, anchor depth of 50-70μm, repair defects in the anti-corrosion layer and polish the lap part.
Pipe preheating: preheat the bare metal surface to 60～80℃.
Primer application: Prepare primer and apply 2~3 times.
Installation of heat-shrinkable tape: Wrap the pipe mouth, lap and compact the fixed piece, bake the heat-shrinkable tape to make it shrink.
Appearance Inspection: Make sure the patch is smooth and flat, and fit tightly.
Peeling Strength Test: Test 24h after the completion of patching, and return to repair if it fails.