Heavy Concrete Weight Coating for offshore pipelines

MagnaDense aggregate in concrete weight coating (CWC) for pipelines increases negative buoyancy and gives mechanical protection against sea motions.

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Paul Pasquino

Paul Pasquino

President / Managing Director Americas

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CWC pipeline coating with MagnaDense

Our customers, the offshore pipeline companies, mix MagnaDense into a high density concrete, which they apply to the pipelines and which provide a heavyweight coating. Alternative subsea pipeline protection is concrete mattresses for which dense concrete is also used.

Using our natural mineral in CWC coating for offshore pipelines will create more weight with less volume. Applying high density concrete on pipelines reduces the concrete volume by up to 50%. Or alternatively, it increases in weight by 80%  while keeping the equivalent strength to standard concrete.

Applying offshore pipeline concrete coating

Our customers, manufacturers of coated pipelines, use two different techniques to apply the heavy concrete as a coating to the pipelines.

  • Spray applied heavy concrete coating. This technique requires heavy concrete to be fluid enough to spray. Adding MagnaDense to the concrete will make it heavier, however, the concrete is still fluid enough to be sprayed onto the pipelines.
  • Compression concrete weight coating. Using this applying method, the pipe gets a concrete weight coating by rolling the heavy concrete with a special technique against the pipeline.
Independent of the applying method you prefer, MagnaDense is suitable for both. The coarse aggregate increases the weight of concrete. This makes sure your concrete coated pipes remain at the bottom of the sea and give mechanical protection.

The correct heavy concrete mix

When preparing the heavy density concrete for your pipelines remember that MagnaDense replaces sand and gravel but other concrete ingredients remain the same. Moreover, you can use standard concrete mixing equipment. Ultimately, the density of the concrete will vary depending on pipeline diameter and sea depth. Therefore, the average density for pipeline coating ranges between 3.2 and 3.4 t/m3.

Ask your LKAB Minerals sales managers for help to select the right combination of MagnaDense grades. We have a brochure with concrete weight coating projects available upon request.

Global availability and offshore pipe coating projects

LKAB Minerals provided MagnaDense to many concrete pipe coating projects and pipe coating companies all over the world. We have global stock locations and owned mines in the Northern part of Sweden. Therefore, LKAB Minerals can assure that they will always be able to supply a high-quality heavy aggregate. This will ensure your production of concrete weight coated pipes at your preferred location, year-round.

A shortlist of projects that have concrete coated pipes with MagnaDense concrete are:

Contact your local salesperson and ask for the project brochure, datasheets or about the MagnaDense possibilities for your upcoming pipeline project.