Dynamica SPM hawser

Subsea fibre hawsers for SPM mooring

Reliable, synthetic fibre and rope hawsers made to withstand the harsh subsea environmental conditions.

Technical information

Load bearing material

HMPE/Dyneema®

Capacity

> 3000+ t of MBL

Length

Up to 100 m

Length tolerance

+/- 0.5 % or less according to customer specifications

Construction (fibre)

Endless loop

Construction (rope)

Single or multicore

Mud & sand filter

Particle barrier

Cover

HMPE/Dyneema®, Dual Cordura, HI-Vis Cordura

Visibility

Longitudinal reflective line

Certification

DNV, BV or other on request

Need a datasheet?

Go to solution request and fill in your details

Solution Request

High strength SPM hawser for subsea and deepsea conditions

A Dyneema^® hawser is a popular choice for a Single Point Mooring (SPM) system because it combines very high strength with low weight and excellent durability in harsh marine conditions in both saltwater and freshwater.

Compared to traditional materials like wire rope, nylon or polyester ropes, Dyneema^® fibres offer:

Lower snap-back energy than steel wire (less recoil if failure occurs)
No corrosion (unlike steel)
More predictable performance under load

For high-load, dynamically loaded offshore tanker moorings, these properties make Dyneema^® one of the most effective and widely used materials.

Functions

Connecting tankers to a floating buoy.
Transfer environmental loads from the vessel to the buoy
Absorb dynamic energy from waves and swell
Maintain safe vessel positioning during cargo transfer

Features

Very good fatigue resistance
High abrasion resistance
Neutrally buoyant and easy to recover
Long service life under dynamic marine conditions
Reduced maintenance and replacement frequency

Applications

Single Point Mooring
Conventional Buoy Mooring
FPSO and FSO Moorings
SPM Monitoring
Fluid Transfer

Why choose Dynamica SPM hawsers?

Selecting the right SPM hawser manufacturer is critical to ensuring safe, efficient, and reliable offshore mooring operations. With increasing demands on performance, durability, and documentation, operators require a partner who combines technical expertise, certified quality processes, and commercial competitiveness. Dynamica Ropes - being one of the leading rope manufacturers in the world - delivers on all three.

Engineering excellence for demanding offshore tanker operations

At Dynamica Ropes, we are a dedicated mooring hawser manufacturer delivering expertly constructed solutions tailored to the most demanding offshore environments. We combine deep technical expertise on ropes and hawser behaviour with a strong focus on quality to ensure that every mooring hawser we produce is engineered for maximum performance, reliability, and long service life.

Technical support for FPSO and PSO Mooring systems

SPM moorings are subject to continuous cyclic loading, wave-induced vessel motion and chafing at fairleads and chocks. Compared to nylon (which has high elasticity), Dyneema^® has a low elongation under load.

Dynamica Ropes can assist with technical support for offshore mooring applications (including SPM systems) helping to identify:

Application specific rope selection
Engineering and design support
Documentation, proof load and certification

Our engineers work closely with mooring and naval engineers to integrate hawser design into global mooring analysis models. This ensures that the selected solution performs optimally within the full mooring system and meets project-specific performance requirements.

Certified quality assurance and full traceability

To ensure the highest quality of Dynamica hawsers, the entire production and manufacturing process is digitally monitored. Our selection of sub suppliers and monitoring of raw materials are done in accordance with the ISO 9001:2015 Quality Standard. When purchasing a Dynamica Hawser you receive a full document package.

Competitive pricing without compromising performance

At the same time, we offer competitive pricing without compromising on materials or engineering standards, enabling our customers to achieve both operational safety and cost efficiency. Our commitment to precision manufacturing, proven offshore performance, and close customer collaboration makes Dynamica Ropes a trusted partner for reliable, high-performance, and future-proof mooring solutions.

Solution Request

Hawser construction

The construction of an SPM (Single Point Mooring) hawser is purpose-designed to handle very high dynamic loads, fatigue, and harsh offshore conditions while maintaining safety and controlled elongation.

SPM hawsers are engineered as multi-layer, heavy-duty rope systems.

Core rope (load-bearing structure)

The core is the primary strength member and is made of Dyneema^® or HMPE fibres. The rope construction is 12 strand braided multiple rope core which is torque-balanced construction.

HMPE/Dyneema-based constructions are increasingly used for:

Reduced weight
Higher strength
Easier handling

External protective cover

Fibre hawsers are equipped with multiple layers of flexible laminated and PU-coated jackets eliminating any chance of particle ingress into the load-bearing core.

The design of hawsers has been chosen in order to achieve the best possible long-term performance under dynamic subsea load conditions.

SPM hawsers often include

Heavy-duty chafe-resistant outer jackets – several layers
Replaceable chafe sleeves in way of fairleads
Polyurethane or polyester coating in high-wear zones

The design of the hawser and the construction of the cover is always done in close cooperation with the customer. Dynamica SPM hawsers are offered with several layers of jackets and additional heavy duty Dyneema^® cover on the anchor points.

Mud and sand filter

Dynamica Hawsers can be manufactured with sand- and mud filter which creates a barrier between the load bearing core and the multiple layers of cover.

The filter is an active barrier to particles and allows free flooding of the tether while protecting the load bearing core.

Eye and end terminations

SPM hawsers are typically supplied with:

Large soft spliced and reinforced eyes
Heavy-duty thimbles

The eye area is one of the most critical structural zones.

What is a Single Point Mooring (SPM) System?

A Single Point Mooring System is a floating buoy that serves as a mooring point for offshore vessels, particularly tankers. These buoys are connected to the seabed using anchor chains or catenary anchor leg mooring systems. The SPM buoy allows for the transfer of liquid or gas cargo from the vessel to the shore or vice versa via flexible hoses and a product transfer system. A central component of this setup is the SPM hawser, which connects the vessel to the buoy and ensures controlled load transfer.

The SPM system is a critical component in offshore tanker operations as it enables vessels to load or unload cargo in deep waters without having to dock at a terminal. The performance of the system depends heavily on the quality, material selection, and resistance properties of its mooring components, particularly the Single Point Mooring hawsers.

The critical role of SPM Mooring hawsers

In offshore operations, Single Point Mooring (SPM) hawsers play an essential role in maintaining the stability and security of vessels during product transfer in challenging marine environments. These hawsers are responsible for withstanding the enormous forces generated by waves, wind, and currents, particularly in open-sea conditions where vessels are constantly exposed to environmental stresses.

The design and strength of a Single Point Mooring hawser are critical in preventing mooring failures, which can lead to severe operational disruptions or even catastrophic events such as tanker collisions or oil spills and environmental disasters. By absorbing and distributing the dynamic loads placed on the mooring system, Single Point Mooring hawsers ensure that the vessel remains securely moored to the SPM buoy, even in extreme conditions like storms or monsoons.

In addition to handling constant movement and shifting mooring loads, SPM hawsers provide a crucial buffer that helps mitigate the risk of sudden breakage or overloading. Their capacity to flex and stretch under pressure allows them to manage the strain placed on mooring lines and anchor systems, offering an added layer of protection to the overall mooring arrangement. Modern fibre ropes are particularly well suited for this purpose due to their high strength-to-weight ratio and excellent fatigue resistance.

Ultimately, the reliability of an SPM system depends heavily on the quality and performance of its hawser arrangement. These components are often the first line of defence against the intense mechanical stresses involved in offshore mooring operations, making them indispensable in ensuring the safety and efficiency of offshore tanker operations. Regular inspection and planned maintenance are therefore essential to preserve resistance, functionality, and operational reliability throughout the lifespan of the system.

Why choosing the right SPM hawser matters

Investing in high-quality SPM hawsers is crucial for ensuring the long-term safety and efficiency of offshore mooring operations. The right hawser not only provides the strength and flexibility needed to handle the extreme forces encountered in open seas but also minimizes the risk of costly failures, such as breakages or equipment damage, that could disrupt production and jeopardize the environment.

Durable materials, like Dyneema^®, offer significant advantages, as emergency back-up and replacements in SPM mooring systems. These hawsers are designed with an unmatched durability and can withstand harsh marine conditions, including heavy loads, constant movement, and severe weather. Their exceptional resistance to abrasion and fatigue as well as UV-resistance helps reduce wear and tear, extending the service life of the mooring system and lowering costs. Combined with competitive pricing and reliable supply, such solutions provide clear operational and economic benefits.

By choosing high-performance Single Point Mooring Systems, operators can enhance the reliability of their mooring systems, ensuring the safety of vessels, crews, and surrounding ecosystems. The investment in quality hawsers not only protects offshore operations from unexpected disruptions but also contributes to long-term operational success.

Do you need help finding the right SPM hawser solution?

If you are unsure which SPM hawser is most suitable for your offshore mooring operations, please feel free to contact us. Our SPM hawsers are available in different configurations and can be customised to meet specific requirements for minimum breaking load (MBL), fatigue performance, elongation, durability, connection types, and overall system compatibility.

Our specialists are ready to advise you on the most suitable solution based on your vessel size, environmental conditions, terminal setup, and operational demands. Don’t hesitate to reach out – we are here to help you select the right SPM hawser solution to ensure safe, efficient, and reliable mooring performance.

Pull-in improvement for Chestnut Oil Field

Offshore operations are challenging and any risk have to be eliminated. National Oilwell Varco asked us to develop a pulling system for Chestnut FPSO - an oilfield located approx. 290 km east of Aberdeen, at a water depth of 120 m.

Redesign of traditional mooring

The world's leading Geo-data specialist collects and interprets data related to the earth's surface, the soils and rocks beneath and provides advice for purposes related to the Oil & Gas industry etc.

worlds biggest braider new building Dynamica Ropes

World’s biggest rope braiding machine

Today, the “business as usual” is not sufficient. Innovation and energy savings are the keys to creating a sustainable competitive advantage. The drive for innovation creates new business, meaningful tasks, and an interesting and challenging working place for our employees.

Edvard Grieg tie-back

Technip was looking for high performance fibre slings with as little elongation as possible, low weight and an extremely low length tolerance (0.20 % or less) to be used for the tie-back operation at 100 m depth in the oilfield in the North Sea. Dynamica SafeLift Slings met this challenge in fact the slings were made with 0.15 % length tolerance.

Permanent mooring - beyond expectations

When easy handling, maintenance free ropes and safety is top priority.

Case Dynamica HD Tethers anchoring of risers

HD Tethers for anchoring of risers

370 metres under the sea level in the rough waters of the Norwegian North Sea, the strongest man-made synthetic fibres serv the purpose of anchoring risers - Dynamica HD Tethers.

Dynamica Tether - Photo credit Havfram https-::havfram.com:

Dynamica Tethers - mooring of MWA

5 huge MWA structures. 90t. 12.5m x 14 m. Manufactured by NOV. Installed by Havfram at Balder field. The installation required each of the MWA’s to be pulled down to enable connection to the preinstalled suction mid-water arch foundation – consisting of 140t anchors using Dynamica MWA Tethers.

FPSO Oil&Gas Dynamica SUPREME ropes SK78 dyneema fibres

Rope lifting system for FPSO

Light and flexible Dynamica pendants were delivered for the rope lifting system for the FPSO in the Caribbean part of South America. The light and strong Dynamica SUPREME ropes made with SK78 Dyneema® fibres have been used for similar systems many times in the past.