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American Petroleum Institute (API) awards bolt fatigue testing program contract to DNV GL

12 December 2018

API aim to improve fatigue assessment of critical bolted connections
Testing will utilize two of DNV GL’s global laboratory network in USA and Norway
Test data will be available via Veracity, DNV GL’s industry data platform
Enhanced knowledge of fatigue performance will enable cost effective designs ensuring safe operations of critical equipment


The American Petroleum Institute has awarded a contract to DNV GL, the technical advisor to the oil and gas industry, for the full-scale S-N* fatigue testing of large diameter bolts. The objective of the program is to improve fatigue assessments of critical bolted connections particularly in subsea applications by generating new test data.

This testing will take place within DNV GL’s global laboratory network involving its sites in Columbus, OH and Norway, which provide extensive corrosion expertise and the ability to test up to capacities of 7500 kN. These laboratories have key subject matter experts in the areas of fatigue of subsea equipment, bolting connections, cathodic protection and instrumented tests.

The program will be performed in a strictly controlled environment. The tests will be highly instrumented to record the number of cycles, stresses, strains, current, pH and oxygen level. The testing is scheduled to be completed by late 2019.

The new test data will be shared on DNV GL’s digital platform Veracity throughout the program. Veracity provides a secure platform for sharing not only key findings and test images, but all logging data with the API project team so they can monitor tests and carry out independent analyses.

“The safety of our operations is priority number one in our industry. Our standards, technical and certification programs are part of the many ways we help industry and companies achieve quality management and safety goals. Through research and testing such as the work that DNV GL will complete, we contribute to a culture of safety, innovation and continuous improvement in the natural gas and oil industry,” said Debra Phillips, vice president of API Global Industry Services.

Frank Ketelaars, Regional manager Americas, DNV GL - Oil & Gas stated “It is encouraging to see API taking a leading role in enhancing industry safety. The type of fasteners tested are used in critical subsea applications and are often exposed to fatigue loads combined with high pressures and temperatures. Enhanced knowledge of fatigue performance will enable cost effective designs ensuring safe operations of this critical equipment.”

For more information, please contact:

DNV GL
Veritasveien 1
1363 Høvik
Tel:  +47 905 81 704
Email: neil.slater@dnvgl.com
Web:  www.dnvgl.com
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