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 /  / Coatings & linings

Coatings & linings

Coating process

During a service life extending over many decades, large-diameter pipes are frequently exposed to environmental extremes. Therefore, reliable coatings for protection against corrosion and mechanical damage are indispensable in most cases.

We provide our pipes with coatings and/or linings to customer requirements and/or in line with applicable standards. Our offering includes:*

Polyethylene coating

Polypropylene coating

Fusion-bonded epoxy

Before coating/lining, our pipes can be subjected to a high-pressure water scrub.

Besides passive corrosion protection, an epoxy lining reduces the surface roughness on the pipe inside surface – and thus the flow resistance – to a minimum, which is particularly beneficial in the case of gas pipelines.

Other coatings and linings are available on request.


Polyethylene coating
Polyethylene (PE) coating

Before coating, the pipe is dried, externally shot-blasted to SA 2.5 requirements and then inductively heated to about 220 °C. This is followed by a primer coat of electrostatically applied epoxy resin (EP) powder with a thickness of 60 to 255 µm. Then a single layer of an approximately 125 to 400 µm thick adhesive foil is wound over the EP. Finally, a PE foil is wound over the adhesive. The pipe ends are left uncoated and, if required, provided with temporary corrosion protection. As added protection against rust creep during extended on-site storage, the transition area from the PE chamfer to the bare pipe end can be provided with a bituminous coat.


Polypropylene coating
Polypropylene (PP) coating

At service temperatures above 80 °C, a coating's indentation resistance becomes increasingly critical. In such cases, we recommend a 3-layer coating system in which the third layer consists of polypropylene. In all other respects the build-up of the 3-layer PP coating system is the same as of the 3-layer PE coating system. Here too, the pipe ends are left uncoated and can be provided with temporary corrosion protection. A bituminous coat can be applied to the transition area from the PP-chamfer to the bare pipe end.


Fusion bonded epoxy coating
Fusion bonded epoxy (FBE)

Epoxy powder is electrostatically applied to the pipe surface, which has previously been shot blasted to SA 2.5 requirements and inductively heated to 240 °C.

Depending on the customer's specifications, the thickness of the single-layer FBE coating can be up to 800 µm.


Epoxy lining
Epoxy lining

Epoxy resin lining to API RP 5L2 is mainly used on gas line pipe. Its purpose is to reduce the pipe's surface roughness and thus flow resistance inside the pipeline for increased transportation efficiency.

At our coating facility, the airless spray technique is used to apply a low-solvent 2-component epoxy resin lining to a dry thickness of at least 60 µm.


Contact

Dr.-Ing. Brahim Ouaissa

Dr.-Ing. Brahim Ouaissa
Head of Department Quality Management and Application Technology

Phone: +49 5341 21-2855
Fax: +49 5341 21-4929
Email: b.ouaissa@smgr.de

© Salzgitter Mannesmann Großrohr GmbH
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