Coated steel pipe means the pipe that is by the processing after the corrosion, which can effectively prevent or slow the steel pipe occurs in the course of transport and chemical or electrochemical reaction corrosion phenomena. Coated steel pipe can effectively prevent or slow down the corrosion of steel pipes to extend service life and reduce operating costs pipe.
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Bare pipe |
SSAW |
LSAW |
ERW |
SMLS |
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Production Range |
OD:219mm-3120mm |
OD:16"-64" |
OD: 1/8"-24" |
OD: 1/8"-36" |
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Length |
Random Length / Fixed Length / SRL / DRL |
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Usage |
Mechanical Tubing,Liquid Transport Steel Pipe,General structure, mechanical structure,Transport liquid, gas, oil |
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Coating Type |
Galvanized Coating /Fusion bond Epoxy Coating/External Asphalt Enamel Coal Tar Epoxy /3PE /2PE/FBE/2FBE/3PP Varnish Coating |
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External Coating |
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Coating type |
Coating Standard |
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3LPE/3LPP |
DIN30670-1991,CAN/CSA Z245,21-2010,ISO21809-1-2009 SY/T 0413-2002,GB/T23257-2009 |
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2LPE/2LPP |
SY/T 0315-2002,GB/T23257-2009,ISO21809-1-2009 |
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FBE(Fusion-bond epoxy) |
SY/T 0315-2005,AWWA C213-2001,CAN/CSAZ245.20-2010,ISO218909-2-2007,API RP5L9-2001 |
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Bitumen coating
Enamel &Tape hot-applied |
BS534-1990,AWWA203-2002,AWWA214-2000 |
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Liquid epoxy coating |
AWWWA C210-2007 |
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Polyurethane insulated coating |
SY/T0415-1996,CJ/T114-2000.EN253-1994 |
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Internal Coating |
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Liquid Epoxy Coating |
AWWAC210-2007 |
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FBE |
AWWAC213-2001 |
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Cement Mortar Lining |
BS534-1990,AWWA C205-2001 |
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Bitumen Coating |
BS534-1990 |
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Technique Data |
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Moisture Content: |
<0.5% |
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Particle Size: |
Larger than 250um<0.2% Larger than 150um<3.0% |
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Density: |
1.2~1.8g/cm3(Owing to the different formula and different colors) |
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Recommened Film Thinkness : |
a. In FBE systems: 300-400 microns (12-16 mils) b. As a primer in 3-layer PE or PP systems: 150-300 microns (6-12 mils) |
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Theoretical Coverage: |
0.6993 m2/kg per mm (134.6 ft2/lb per mil) |
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Operating Temperature Range: |
"-73ºC (-100ºF) to 110ºC (230ºF) |
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Storage Time: |
12 Months if stored below 27ºC (80ºF) and 65% relative humidity. |
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On Sieve: |
150μm powder on sieve ≤3%,250μm powder on sieve ≤0.2% |
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Gel time: |
under 200℃≥12s, and in accordance with manufacturer’s value ±20% |
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Thermal properties |
ΔH≥45J/g,Tg2≥95℃ |
Applications of coated steel pipe
coated steel pipe base metal is including spiral, straight seam pipe, seamless steel pipe, etc., which are widely used in pipeline projects in the field of petroleum, chemical, natural gas, heating, sewage treatment, water, bridges, steel structures, piling and other marine water.
Standard:
DIN 30670: Polyethylene coatings of steel pipes adn fittings.
DIN 30678: Polythylene coatiing of steel pipes and fittings.
SY/T0413-2002: Technical standard of polythelene coating for buried steel pipeline.
Types of anti-corrosion coating
Pipe corrosion types are divided into external corrosion and internal corrosion.
1. FBE anticorrosive epoxy powder
FBE epoxy powder preservative structure: electrostatic spraying
epoxy powder coating on the pipe surface, a film. The coating
has a coating operation is simple, clean, good impact resistance
and flexural properties of the coating, temperature resistance
advantages.
2. 2PE/3PE corrosion
2PE/3PE corrosion structure: the steel surface electrostatic spraying
epoxy powder and binder twine lateral lateral wound polyethylene
coating, combined with three excellent performance, thereby significantly
improving the overall quality of corrosion of the pipe. Resistant to chemical
corrosion, cathodic stripping, resistance to mechanical damage performance.
3. Coal tar epoxy
Coal tar epoxy structure: epoxy resin + filler made of coal tar pitch
anticorrosive coating on the steel surface coated glass fabric as reinforcement
corrosion layer formation, commonly used in the pipe wall corrosion. thickness of 0.5 ~ 1.0mm.
