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Hesselberg Hydro

Offshore Services

As a partner of the Marine Mastic Limited consortium, Hesselberg Hydro offers a variety of services to the offshore industry


Marine Mastic Granules

When steel pipelines are concrete coated to give negative buoyancy underwater, the pipe ends are left to allow sections to be welded. On the lay barges, pipes are welded leaving a gap in the concrete. Usually, gaps are filled with hot mastic poured into a shutter placed round the pipe. As welding technology has improved, placing the mastic has become the limiting factor, holding back production.

Historically, mastic was supplied in blocks which were fed into a crusher before heating in the mastic boiler. Hesselberg Hydro’s laboratory research and small scale testing of alternative forms of mastic led to a new patented product, Marine Mastic Granules.

Advantages of granules

Granule options

Marine Mastic Ltd sold over 40,000 tonnes of granules in its first year. Now, Marine Mastic Granules dominate the market.


Sarmac Mattresses

An ideal protection for cables and pipelines.
In relatively shallow waters, cables and pipelines need protection from mechanical damage:

  • Placements in busy shipping lanes especially vulnerable
  • Protection needed from anchors, rock dumping, and other sources.

And while the world’s seabeds are becoming ever-more congested with pipelines and cables, protection of crossing points is a growth area. Sarmac mattresses are often specified for pipeline and cable protection projects