MTU Onsite Energy will be including quakeproof diesel gensets delivering between 615 and 3,250 kW in its offerings in the near future. Just recently, the “smaller” gensets with power outputs ranging from 615 to 1,250 kW went up against the industry’s well-known Shaker Table Test (IBC seismic testing)—and won. The next generation Series 2000 and Series 4000 diesel generator sets were designed for mission-critical applications, particularly those in locations with seismic activity, such as California.
Generator manufacturers use Shaker Table Tests to measure the ability of their equipment to survive under realistic conditions of shock, vibration and earthquake ground motion. MTU Onsite Energy visited the U.S. Army Corps of Engineers’ Construction Engineering Research Laboratory (CERL) in Champaign, Illinois (USA) for the testing. The units were tested on a three-dimensional “shake table” to assess their seismic vulnerabilities. The MTU Onsite Energy units are the largest ever shaken by MTU Onsite Energy on this kind of simulator and both new generator sets drastically improved their rooftop and grade certification ratings.
“The Series 4000 was previously certified with an SDS = 2.2g (2.2. times the acceleration due to gravity) for grade and SDS = 1.2g (1.2 times the acceleration due to gravity) for rooftop,” said J.D. Carsten, Senior Manager Mechanical Engineering at MTU Onsite Energy. That meant that in tests with shocks and vibrations 2.2. or 1.2 times greater than the acceleration due to gravity, they sustained operation during the event and after. “Now, both systems are rated at a best-in-class SDS = 2.5g at grade and rooftop, guaranteeing our customers operation after the most extreme of earthquakes.”
Passing the Shaker Table Test was a critical engineering focus in the development of the new systems. The industry-leading rating provides MTU Onsite Energy with a key differentiator from competitors while offering customers increased flexibility, which is essential for mission-critical facilities like data centers and hospitals that must adhere to stringent building codes.
Shaker Table Tests are voluntary and completed at approved shock and vibration test facilities around the world. Upon completion, generators obtain seismic certification under the International Building Code (IBC) standards, a comprehensive set of building standards with the goal of harmonizing the many national, state and local codes that govern the design of structures. In the U.S., all 50 states and the District of Columbia currently mandate facilities to adhere to a version of the IBC when developing. Additionally, healthcare facilities in California are mandated by the Office of Statewide Health Planning and Development (OSHPD) to comply with their certification requirements for all power equipment. The new MTU Onsite Energy generator sets adhere to both standards making them two of the highest-rated, most powerful and largest systems on the market with an SDS = 2.5g rooftop and grade certification.