Q: What makes slings made with Dyneema® SK78 safer and more reliable to use?
A: Dyneema® SK78 fiber is renowned for its quality, consistency and assured performance. This has resulted in an Approval of Manufacturing Certificate by DNV GL, and Type Approvals by Bureau Veritas and ABS. It is also designed to be greater than two times more fatigue resistant, and DSM has developed tools that accurately predict sling performance in a number of environments, ensuring peace of mind for operators.
Q: What is the difference between ‘Verification’ and ‘Certification’?
A: Certification under DNVGL-OS-E303 means that the full production process, comprising manufacture, testing, assembly and commissioning has been reviewed and found to comply with validated requirements.
A Verification Statement confirms that an independent body has witnessed the sling being loaded to a certain force. No assessment is made of the fiber rope production method or sling assembly and no relevant information regarding base yarn is considered, even if a yarn certificate is available. In short, you do not know what you’re getting or how it will actually perform.
A Verification Statement, as a result of a verification for a break load or proof-load test is NOT a ‘Certificate’ for a sling and does not state that the sling is fit for the intended lifting purpose. A break strength and/or proof-load test shows that a sling has experienced a particular static load, for a certain amount of time, under controlled conditions.
This kind of load-capacity verification is typically carried out on a totally different pin diameter and/or hardware geometry compared to a real-world situation. It does not consider any other characteristics experienced during a real-life lifting operation (e.g. dynamic loadings), therefore it is a very basic indication of sling performance and reliability in a project scenario.
This is why a Verification Statement of a break strength and/or proof load test cannot be compared to a full and robust product certification, like DNVGL-OS-E303, which encompasses all the steps described above.
Q: DSM’s SK78 fiber has a DNV GL Approval of Manufacturer Certificate. What does this represent?
A: DNV GL’s Approval of Manufacturer (AoM) Certificate confirms that we have complied with international standards, regulations and recognized DNV GL rules. This proves our products are high quality and meet the highest safety standards.
Such certification is supportive of DNV GL Type Approvals as well as approvals according to DNVGL-OS-E303, meaning that the full production process, comprising manufacture, testing, assembly and commissioning, has been reviewed and found to comply with validated requirements.
A certified sling is based on an AoM-certified yarn and is important in ensuring greater reliability, durability and extended service life which, in turn, translates into reduced sling maintenance costs, repairs, logistics and replacement.
DSM’s Approval of Manufacturing Certificates can be freely downloaded or on DNV GL’s Approval Finder portal.