If you have received several offshore rigging plans recently, you will notice a common thread: the plans name HMPE slings directly, rather than vaguely writing "fiber sling" or defaulting to steel wire rope. It reflects the parallel evolution of offshore lifting demand and the HMPE material ecosystem.
1. Heavier components
Over the past decade, offshore lifting has faced these trends:
- Bigger turbines: unit capacity keeps climbing, and the single-piece weights of monopiles, towers, nacelles and blades keep setting records.
- Deeper offshore: moving from nearshore fixed-bottom to far-offshore floating, with higher water depth and sea-state complexity, demanding tighter lifting windows and positioning accuracy.
This is the physical reason HMPE is specified: every metric ton saved on the sling frees a metric ton for the load, and at equal working capacity an HMPE sling weighs about 1/8 of a steel wire rope sling. On ultra-heavy lifts, this difference can reach tens of tons, directly deciding whether you need to move to a larger crane.
2. Total cost of ownership
HMPE fiber itself is more expensive, and the braiding and cover processes are more labour-intensive, so the purchase price is higher than steel wire rope. But over the full project lifecycle, the picture often reverses:
- Less ancillary equipment: the lighter sling needs fewer auxiliary cranes and transporters.
- Less labour: HMPE can be rigged by hand, reducing mechanical assistance.
- No corrosion maintenance: hydrophobic and seawater-resistant, it needs essentially no maintenance in long-term offshore storage, unlike steel which needs continuous corrosion protection.
- Lower transport & replacement cost: light and service-life-friendly, it pays off in frequent lifting scenarios.
So in long-term offshore storage and frequent lifting scenarios, HMPE's life-cycle cost often beats steel wire — the commercial case that makes owners willing to name it in their plans.
3. Safety
- No "fishhook" risk: after fatigue, internal broken wires in steel wire rope form sharp "fishhooks"; HMPE has no such metal broken-wire injury hazard[1].
- Low elongation aids precise positioning: wind turbine components require high alignment accuracy, and HMPE's elongation under working load is very small, making operations more controllable.
4. Material-side progress
Industry research continues to drive improvements in HMPE fibers toward low creep and fatigue resistance, making them more reliable in offshore sustained-load scenarios.
Mature fiber grade system: for lifting and mooring, leading suppliers offer low-creep grades (such as Dyneema®-type low-creep product families), designed specifically for long-term sustained loads, with creep behavior significantly better than general-purpose grades. When procuring, you can specify the grade by duty rather than vaguely writing "HMPE".
Classification society type approval: in 2026, Avient's low-creep Dyneema® grades for floating-wind mooring received ClassNK type approval[2], meaning material performance has been independently verified and can be referenced directly within the regulatory framework. This gives owners and EPCs a solid basis when specifying HMPE in plans — a key marker that the supply chain is ready.
Floating wind engineering validation: the same material has also completed engineering validation in floating wind mooring — feasibility studies on HMPE/Dyneema® tendons for floating wind TLPs (tension leg platforms) have been published[3]. This proves the material system is reliable in the most demanding scenarios of "long-term, deep-sea, dynamic loads".
5. European floating wind demonstration projects drive rigging upgrades
Multiple European floating wind demonstration projects are entering construction, with the supporting lifting, installation and O&M operations upgrading in parallel. Floating platform structures are larger and offshore installation windows are tighter, demanding lighter rigging and higher positioning accuracy — directly driving HMPE sling penetration in project plans.
Case in point: liftrue delivered HMPE eye-and-eye slings (WLL 40 t) for monopile lifting in the RWE Nordseecluster B project — see the full application case.
Procurement tip: The owner's rigging plan usually specifies the material grade; your job is to confirm the manufacturer's grade matches the plan and keep written records.
6. Procurement tip: when the plan specifies HMPE, verify these three things
Specifying HMPE does not mean "just buy it". Before ordering, focus on:
| Check item | What to check | Why it matters |
|---|---|---|
| Material grade | Does the plan specify a grade? If not, require the supplier to state in writing the grade used and its suitability | Different grades differ significantly in creep and fatigue behavior; long-term/critical duties should use low-creep grades |
| Design factor | ISO 18264 regional values: 7 in the EU, 5 in the US; critical offshore lifts are often higher | The design factor determines the WLL and directly relates to the safety margin |
| Factory tests & documentation | Manufacturer's certificate of conformity, verification test certificates (if required), traceability codes | Offshore projects usually require complete documentation before acceptance |
For the full pre-order checklist, see Precautions for Procuring HMPE Slings.
7. FAQ
Why do owners specify HMPE instead of letting the contractor choose?
Because light weight directly affects whether a lift can be made safely, and corrosion resistance and low elongation relate to the safety and precision of long-term offshore operations. Writing the material into the plan manages the key risks up front, rather than leaving them to on-site ad-hoc decisions.
Does specifying HMPE mean steel wire rope is no longer good?
No. Steel wire rope still has advantages in sustained high temperature, extreme abrasion and tight budgets. When a plan specifies HMPE, it is usually because hook-load weight, positioning accuracy or offshore storage is the main concern. Follow the plan rather than reading more into it.
Our project is small — do we need to follow the trend and use HMPE?
It depends on the duty. For small tonnage, infrequent lifting and no long-term offshore storage needs, polyester or steel wire rope may be more cost-effective. HMPE's advantages fully pay off in ultra-heavy, frequent-move, long-term storage scenarios.
What are low-creep grades? Are they expensive?
Low-creep grades are HMPE fibers optimized for long-term sustained loads — less creep and more stable service life, but generally with somewhat lower strength than standard HMPE. They cost a little more than general-purpose grades, but are more economical for long-term/critical duties. Whether they are necessary depends on the duty — for short-term lifting, general-purpose grades are sufficient.
What is the relationship between HMPE mooring for floating wind and slings?
They use the same material system. Mooring validation proves HMPE is reliable under deep-sea, long-term, dynamic loads, showing the material system is proven.
After HMPE is specified, what else should procurement pay attention to?
Mainly parameter consistency and documentation completeness: material grade, WLL, design factor, cover, marking, and MTC/MTR must all align with the plan, and batch traceability should be retained. See the Precautions for Procuring HMPE Slings for details.
8. What the research says
Full-scale testing of HMPE slings in offshore lifting operations has confirmed their reliability in marine service, and that they are lighter and safer to handle than steel wire rope[1]. This provides an evidence base for the argument to use HMPE in critical offshore lifts.
Further reading
- HMPE Slings: The Complete Procurement Guide for Offshore Projects
- HMPE Slings vs Steel Wire Rope vs Polyester: How to Choose for Offshore Lifting
- Precautions for Procuring HMPE Slings
- HMPE Sling Limitations
9. Technical notes
EN 1492-2 base materials do not include HMPE; HMPE-specific values follow ISO 18264:2022. This article is a trend overview and does not constitute a lifting design basis; actual parameters follow the rigging plan issued by the owner/EPC.
References
[1] Lian Y. et al., Experimental investigation on service safety and reliability of full-scale HMPE fiber slings for offshore lifting operations. Ocean Engineering 285 (2023).
[2] Avient secures ClassNK certification for HMPE fiber in FOWT mooring systems. SpecialChem (2026).
[3] DYNEEMA feasibility study on HMPE tendons for floating wind TLPs (Bluewater × Dyneema®), Ocean Engineering (2025).
* These peer-reviewed sources underpin the "What the research says" section above. Please note that literature-based guidance complements, but never replaces, the certification and rigging plan issued for your specific project.