Ramnäs - Dockstr



Ramnäs Bruk develops, manufactures and markets anchor chains, RAMFOR connectors and accessories for qualified mooring systems, mainly to the offshore industry. We manufacture high quality offshore mooring chains, stud or studless, in heavy duty material in long continuous lengths including chafe chains, and is approved as a manufacturer by all major classification societies for both offshore grades and ship’s grades.Ramnäs Bruk is the first choice of the customers, who give priority to quality in all stages.


Ramnäs Bruk products are built with quality and based on a truly long history of chain manufacturing. The product reliability achieved in every delivery is a result of thorough craftsmanship in combination with experience collected. We have developed manufacturing processes, control and inspection routines that withstand any comparison.

We combine a high quality product, manufacture of anchor chains in continuous lengths. Ramnäs Bruk’s anchor chain cable will be found in use worldwide on oilrigs, offshore loading terminals, FPSO’s and onboard ships.

The preferred production range is 70mm to 165mm diameter in all grades, except offshore grade R4, which includes max 157mm diameter. Ramnäs Bruk chain grades include grade 2, grade 3, ORQ, ORQ+10%, ORQ+20%, NVR3/R3/RQ3/QR3, NVR3S/R3S/RQ3S/QR3S, NVR4/R4/RQ4/QR4 and Grade 4+.


Ramnäs Bruk’s stud anchor chain is fitted with drop forged studs. The asymmetrical design of the stud gives equal stud footprints and contributes to a symmetric stress-distribution in the link. This design combined with Ramnäs Bruk’s stud expansion, performed after proof loading is the standard method in Ramnäs Bruk production process since 1991. The benefit is reduced percentage of loose studs in stud link mooring chain. The percentage of loose studs has been cut from an average of 30% to 70% to 0.29%. The asymmetrical stud design and the procedures for stud expansion are approved by ABS, DNV and LRS.


Ramnäs Bruk studless link can deliver the same performance as a stud link in terms of static strength while offering a saving of some 9% in weight. For deepwater applications, there is a potential reduction in weight, and consequent cost saving. Alternatively, the weight can be kept constant and fatigue strength correspondingly increased by opting for a larger diameter chain. This option also gives a greater margin of safety against the incidence of corrosion.


Connectors type RAMFOR has the same outside shape as a traditional Kenter joining shackle, but with improved fatigue properties. The difference is the design of the interior. The RAMFOR and RAMFOR Slim designs have a locking head of a different design than that of the Kenter joining shackles. This locking head has been designed to provide a larger load-carrying area, which in turn gives a better stress distribution. RAMFOR and RAMFOR Slim type connectors have the same outside shape as the Kenter joining shackle and the RAMFOR Slim has a reduced thickness equal to the Baldt type connector.

RAMFOR and RAMFOR Slim are dismantled/assembled in a similar way as the Kenter joining shackle, but with greater ease.

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