STEVSHARK®REX

Holding power in the most extreme conditions

No anchor can deliver the holding power of the STEVSHARK®REX. The application of drag embedment anchors has been expanded to the most remote and challenging territories on earth. Strong soils are no longer prohibitive, opening up the economic possibility for operators to develop new energy resources in a much larger area globally.

The STEVSHARK® anchor design was introduced some 3 decades ago. Since then, the anchor design has proved to be consistently superior over any other drag anchor design available on hard soils and stiff clays. It became the most applied anchor in industries that require high holding power, versatility and stability such as the offshore industry and more recently in the Marine Renewable Energy industry (MRE). A considerable part of drag anchor applications is found under hard soil conditions such as cemented soils, hard clays as well as in areas with soft rock (shallow continental shelf). As even the best drag anchor will not penetrate some of these soils, Vryhof introduced the STEVSHARK®anchor.

In the past the STEVSHARK® was an adapted version of the STEVPRIS® anchor, with a number of reinforcements aimed at a higher structural strength and the ability to penetrate into hard soils. With the STEVSHARK®REX design however, Vryhof chose to take the current STEVSHARK® as a departing point. The set of design parameters was based on the STEVSHARK® inherent strong points, but was to also include improvements that became in reach due to better understanding of anchor design and STEVSHARK®’s behavior over the last decade.

Anchor design

The overall anchor geometry is a combination of improvements in anchor penetration, handling and efficiency. Anchor efficiency of the STEVSHARK® has increased over the current version. Type approval was obtained from main Class Authorities upon finalizing the design for manufacturing. The all-new STEVSHARK®REX was tested several times in traditional and challenging soil conditions consistently behaving as predicted and proving its superior performance.

25 years of hard soil experience

The STEVSHARK® represents 25 years of operational experience with the STEVSHARK® anchor of which some 5,000 were sold. This implies the vast experience recorded in hard soils such as stiff/hard clays, dense sands, cemented and over-consolidated soils and rocks. This experience includes soils where a conventional anchor may penetrate the top layer, but may however prove unable to reach the targetted depth due to complexity of a deeper soil layer. The STEVSHARK®REX tackles these complicated soils more effectively.

HARD SOILS
The application boundaries of drag embedment anchors can now be expanded to the most remote and challenging territories on earth. Strong soils no longer represent an obstacle. Hard clays, cemented carbonate and calcarenite rocks.

ULTIMATE HOLDING CAPACITY
Depending on the location, the holding power of the STEVSHARK® REX proved to be 22% to 47% higher than the previous STEVSHARK® version.

Features & specifications of the STEVSHARK®REX

With the STEVSHARK®REX design, Vryhof chose to take the current STEVSHARK® as a departing point. The set of design parameters was based on the STEVSHARK® inherent strong points, but was to also include improvements that became in reach due to better understanding of anchor design and STEVSHARK®’s behavior over the last decade.

  • Features STEVSHARK®REX
    STEVSHARK numbered anchor
    1. Wide spread shanks and redesign geometry improve penetration, stability and strength.
    2. Anchor shackle protected inside shank head avoiding chaser damage.
    3. One pair of sharp teeth cuts the seabed at any time.
    4. Sharp fluke points to enhance initial penetration.
    5. Leading edges where the anchor touches soil first.
    6. Hollow fluke takes ballast up to 60% anchor weight.
    7. 4 angle settings, expand versatility on layered soil.
    8. Shank design assures stability on deck.
    9. Deep shank width increases side stabilty and side loading and side loading stength.
    10. Low centre of gravity assures correct arrival orientation at the seabed.
    11. Strong padeyes.
  • Anchor design

    The overall anchor geometry is a combination of improvements in anchor penetration, handling and efficiency. Anchor efficiency of the STEVSHARK® has increased over the current version. Type approval was obtained from main Class Authorities upon finalizing the design for manufacturing. The all-new STEVSHARK®REX was tested several times in traditional and challenging soil conditions consistently behaving as predicted and proving its superior performance.

  • HSE minded
    • Stability on deck
    • Assembly blocks
    • Stability on stern roller
    • Easily accessible and strong recovery or piggy back
  • 25 years of hard soil experience

    The STEVSHARK® represents 25 years of operational experience with the STEVSHARK®anchor of which some 5,000 were sold. This implies the vast experience recorded in hard soils such as stiff/hard clays, dense sands, cemented and over-consolidated soils and rocks. This experience includes soils where a conventional anchor may penetrate the top layer, but may however prove unable to reach the targetted depth due to complexity of a deeper soil layer. The STEVSHARK®REX tackles these complicated soils more effectively.

  • Soil adaptability

    Although specifically developed for anchoring in areas with hard soils, the new STEVSHARK®REX can be set at different fluke/shank angles, allowing adjustment to successfully anchor in softer soils without having to change the anchor type.

  • Uplift capability

    Although primarily applied for anchoring in harder soils, when used in soft soils the new STEVSHARK®REX has larger uplift capability allowing it to also moor in deeper waters.

  • Higher strength

    Challenging soil also impose extraordinary structural loads on the anchor. STEVSHARK®REX is designed for these and match the strength of R5 + 30% chains.

  • Wide field of application

    Works on hard soils, subsea permafrost, complex gravel and over-consolidated clays. Its handling features have been improved to allow use on relatively small construction and dredging vessels, where its higher efficiency allows for using a smaller anchor for the same holding capacity.

  • Options STEVSHARK®REX
    • Cutter points
    • Internal ballast
    • External ballast
    • Anchor tracking
    • Recovery bridle systems
    • Teethless – rackable version
  • Ultimate Holding Capacity

    Always contact Vryhof for appropriate calculations.

DOWNLOAD PRODUCT BROCHURE

For decades, the STEVSHARK® anchor design has proved to be consistently superior over any other drag anchor design available.

The revolutionary STEVSHARK®REX is even better, smarter and stronger. Strong soils no longer represent an obstacle.

Discover how its unique features will uplift your next project; download the STEVSHARK®REX product brochure here.

brochure(Stevshark.Rex).1

Questions about STEVSHARK®REX?

manual(anchor.manual).1

Vryhof manual: the ultimate anchoring and mooring guide

Download the manual

As of June 1, Vryhof will no longer support the Internet Explorer 11 browser. For the best experience, please switch to a modern browser