DYNAMICA heavy duty lifting slings
DYNAMICA slings made with the strong Dyneema® fiber are a real game changer in onshore and offshore lifting. Same strength but more precision, more efficiency and more safety.
DYNAMICA SafeLift slings and DYNAMICA Secure Lift FIBER slings are manufactured in accordance to DIN EN 1492-4 and are CE-marked. You are welcome to download our datasheets by following the links below for more technical information. Do you have questions regarding a specific lifting operation or would you like to hear the opportunities for using DYNAMICA heavy-duty lifting sling you are more than welcome to contact us.
DYNAMICA SafeLift slings for heavy-duty lifting operations
DYNAMICA SafeLift slings made with Dyneema® are manufactured in a single, double or triple construction depending on the purpose of the sling and consumer wishes. Dynamica SafeLift slings are designed from ropes braided with Dyneema® fiber and are very light, compared with steel wire ropes. Furthermore, they are safer to handle, since the risk of backlash in case of overload, is very low. Compared to steel wire DYNAMICA heavy-duty lifting slings store very little energy, which is reducing the risk of backlash significant.
It is an option to order DYNAMICA SafeLift slings with protective jackets or eye sleeve in order to increase the abrasion resistance and protect the sling. Read more about DYNAMICA cover solutions.
DYNAMICA FIBER for heavy duty slings
DYNAMICA SecureLift FIBER slings made with Dyneema® have the same advantages as DYNAMICA rope slings. Another very important point is that the construction of heavy-duty FIBER slings makes it possible to manufacture very short slings with the same high strength. This is essential for lifting operations where the amount of space for lifting equipment is limited.
Low weight heavy-duty lifting slings made with Dyneema®
DYNAMICA heavy-duty lifting slings made with Dyneema® are much lighter than steel wire slings, which makes handling of the slings magnificent easier.
DYNAMICA ropes are approx. 10 times stronger than steel wires pr. unit of weight. It means that DYNAMICA lifting slings have a slightly higher strength than a steel wire of the same diameter – but less than one tenth of the weight. The low weight makes the slings easy to mount correctly and the employees dealing with the heavy-duty lifting slings minimize the risk of back pains. Another great advantage for the crew handling the slings is that heavy duty lifting slings made with Dyneema® are much softer than steel wire, which reduces the risk of hand injuries significant.
Dyneema® heavy lifting slings with very low EWL tolerance
When talking heavy lifting operations and engineered lifting, it is often a crucial point that the lifting equipment has a very accurate length (EWL). Dynamica Ropes therefore often get the question:
“How precise is the length of your rope slings made with Dyneema®?”
In general all DYNAMICA rope slings are manufactured according to DIN EN 1492-4, which means that all our products meet an EWL (Efficient Work Length) tolerance of 3.0%. Our fiber roundslings are manufactured according to DIN EN 1492-2, that allows an EWL tolerance of 2.0%. Even though we are manufacturing according to the two mentioned standards we deliver products with a lower EWL tolerance, since this is often necessary within engineered lifting and other heavy lifting operations.
In the following, we will answer the question by giving an example based on a case about a DYNAMICA 4-leg Bridle made with Dyneema®. The sling solution is manufactured for a customer within the heavy lifting industry.
4-leg DYNAMICA Bridle with an EWL tolerance of max 1 %
In this given case we refer to a 4-leg Bridle designed with 4 double slings made of 12 strand braided 44 mm SK78 with Dyneema®. For extra protection against abrasion, all bearing points are protected with yellow and black DYNAMICA PRO cover. This 4-leg bridle must – in accordance with DIN EN 1492-4 – meet an EWL tolerance of 2.5% (regular rope slings must meet an EWL tolerance of 3.0%).
One of the most essential points in this case is that the four legs (double 44 mm slings) have the exact same length. The heavy lifting equipment is used like the drawing demonstrates and inaccurate lengths of the slings can have fatal consequences. When manufacturing this 4-leg bridle according to the EWL tolerance of 2.5 % in line with DIN EN 1492-4, the difference between two of the four slings can be 280 mm. In this case, a difference of 280 mm was too big for the lifting operation planned by the customer, so we agreed an EWL tolerance of 1%.
Proof load certificates demonstrates an average deviation of 47.5 mm of the four slings
All DYNAMICA SafeLift slings with no exception, also the above-described 4-leg Bridle, have been proof loaded in our in-house test bed.
Proof load certificates form part of the Document Package delivered together with all DYNAMICA SafeLift slings and rope solutions for heavy lifting. The measured EWL evidence from the proof load certificates of the four slings in this specific case are transferred to the table below.
|Legs for 4-Leg Bridle||Ordered EWL||Measured EWL||Deviation (mm)||Deviation (%)|
|Leg 1||5600 mm||5646 mm||46,0 mm||0,82 %|
|Leg 2||5600 mm||5643 mm||43,0 mm||0,77 %|
|Leg 3||5600 mm||5647 mm||47,0 mm||0,84 %|
|Leg 4||5600 mm||5654 mm||54,0 mm||0,96 %|
After the proof loading it is clear that all four heavy duty slings have a deviation in EWL under 1 % and the average deviation for all slings are 0.8475 % meaning 47.5 mm.
The above illustrates how precise DYNAMICA SafeLift ROPE slings are manufactured. Our riggers are able to obtain this remarkable result due to a high level of knowledge of Dyneema® fiber, high rigger skills, professional test facilities as well as the rope heat-setting process. We always secure precise lengths for the lifting equipment and are able to meet very specific requirements.
The difference between Creep and Elongation
Do not make the mistake and confuse elongation with creep. Creep is a material property, which often is misunderstood and confused with constructional elongation although these are two different matters. Creep can be defined as the continued extension of a material when exposed to a constant static load, during a period of time and at the given temperature. When talking about rope made with Dyneema®, creep is the length at which the fiber in the rope stretch over time. Constructional elongation is on the other hand referring to the extension of the rope due to the construction of the product. All DYNAMICA heavy-duty lifting slings are proof loaded according to the standard in our in-house Test Facilities.
How are DYNAMICA heavy lifting slings proof loaded?
The term “Proof Test” designates a quality control test applied to the sling for the sole purpose of detecting defects in material or manufacture.
The Proof Test Load is the load, which the product withstood without deformation when new and under laboratory test conditions. A constantly increasing force is applied in direct line to the sling at a uniform rate of speed in our State-of- the–Art Test Bed . The Proof Test Load does not mean that the Working Load Limit should ever be exceeded.
Every single DYNAMICA ROPE sling and FIBRE sling made with Dyneema® are proof loaded in our in-house Test Bed at Dynamica Ropes’s Headquaters in Denmark, which has a capacity of 500 t. ROPE slings are proof loaded according to DNVGL-ST-N001 to secure a precise length and a maximum breaking strength:
- Slings with a WLL ≤ 25 t the proof load is 2 x WLL
- Slings with a WLL > 25 t the proof load is 1,22 x WLL + 20 t
Example of the higher safety in lifting operations by Proof Loading of Dynamica slings
Dynamica SafeLift ROPE sling
- WLL: 100 t
- SF 7: 1
- MBL: 700 t
- Proofload to WLL 100 x 1,22 + 20 = 142 t
- Your safety: The Proof Load 42% higher than the highest allowed load, which the sling can ever be used for during the lifting operation
A mechanism of the Test Bed using specially designed hydraulic cylinders with independent load cells provides an accurate reading of the force exerted on the sling. In the process of proof loading DYNAMICA heavy lifting slings the fibers in the sling aligne and in case of the rope slings also the splice is tighted, and the constructional stretch is pulled out of the rope so the elongation is reduced. During the Proof load he EWL is registered and stated on the Proof load certificate.
What is the benefit of proof loading heavy lifting slings in our Test Bed?
Choosing a Proof Loaded sling you make a safe choice, as the proof loading is our guarantee to you, that the heavy duty lifting sling can carry the load, which it is designed for.
- The proof loading secures the stable length of the sling
- The proof loading assures the smallest possible length tolerance in case of multiple lift.
- The proof loading certificate is a part of the Documentation that follows with the sling.