DIN 30670 Polyethylene Coating Steel Pipe

 

DIN 30670 specifies the requirements for factory-applied three-layer extruded polyethylene coatings and one or more layers of fused polyethylene coatings that provide anti-corrosion protection for steel pipes and fittings. These coatings are suitable for protecting buried or submerged steel pipes designed to operate at temperatures ranging from -40°C to +80°C.

DIN 30670 Polyethylene Coating Steel Pipes are pipeline constructions made of straight seam welded pipes, spiral welded pipes, or seamless pipes for transporting liquids or gases. The PE coating provides sufficient protection against mechanical, thermal, and chemical forces encountered during operation, transportation, storage, and installation.

DIN 30670 Polyethylene Coating Steel Pipe Specification

Type

DSAW steel pipe with Polyethylene coatings

welded steel pipe with Polyethylene coatings

Size: 10.3-1020mm * 2mm-40mm(1/4" - 40" )

WT: 1.24mm - 60mm (SCH10-SCH160)

Length: 5.8M; 6M; 11.8 M, 12M or as customer's requirement

Material

API 5L Gr. B X42 X46 X52 X56 X60.

ASTM A106/53 Gr. A /Gr. B / Gr. C

APL 5CT:J55, K55, N80, L80, C90, T95, P110

DIN 1629: St 37.0, St 44.0, St 52.0

DIN 17175: St35.8, St45.8, 17Mn4, 17Mn5, 15Mn5, 15Mo3, 13CrMo910

EN10240: S235JO, S235JR, S355JR, P265TR1, S355JRH...

Polyethylene Coating Steel Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Surface Treatment

The surface of steel pipes and fittings should be cleaned by sandblasting, achieving a grade of SA 2 1/2 according to DIN EN ISO 8501-1. During surface treatment and subsequent coating processes, the pipe surface temperature should be at least 3°C above the dew point. Surface roughness R_z should be between 40 μm and 90 μm. After cleaning, the pipe surface quality should be visually inspected. Before applying the coating, the metal surface of the steel pipe should be free of any contaminants and harmful substances such as dirt, oil, grease, and weld spatter, as these can impair coating adhesion.

Pipe Coating

Before coating, the pipe surface should be heated to the required temperature, and this temperature should be monitored. This also applies to the relevant parameters of the extrusion production line. The appearance of the intermediate layer should be regularly inspected. After cooling, the appearance and continuity of the coating system should be visually assessed along the entire length of the pipe. The coating should be uniformly colored, smooth in appearance, free from pinholes, and devoid of other defects that could negatively affect the coating quality.

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