RED has been testing tensioner pads for nearly 10 years to determine their performance characteristics prior to offshore operations – typically measuring the friction co-efficient between the pad and a sample product.
Interestingly, different customers ask us to provide different data – some have requested a dynamic friction co-efficient whilst others a static friction co-efficient.
Naturally as a company of professional engineers, this has stimulated debate both with our customers and internally. We believe that testing the static friction co-efficient of the pad gives a more accurate assessment of pad performance as it gives a more consistent indication of how the friction co-efficient changes as the load in the pad changes. This allows operators to fully understand the capabilities of their equipment, ensure operational safety and potentially avoid the need for system upgrades as they deliver installation projects in ever deeper water.
Although measuring dynamic friction has some attractions, we believe that it provides more conservative data and makes it very difficult to accurately assess the detailed pad behaviour at the point of slip.
With our full-scale and small-scale pad test rigs and Labview data acquisition software, we can provide both types of measurement but what do you think?