UL, a global safety science leader, announced that ERG, producers of electricity from clean, renewable and sustainable sources, is the first entity to receive a certificate for UL 4143, the Standard for Wind Turbine Generator Lifetime Extension, for an ERG wind farm in Italy.
The move helps advance the ongoing safe operation of clean, sustainable energy generation.
UL 4143 is a process of assessing lifetime extension for a wind farm through onsite inspection of turbines and blades focused on structural integrity, and an analytical evaluation of the site conditions to determine the remaining useful life for each structural component.
The evaluation is done using UL’s aerolastic models with inputs from the plant such as building permits, maintenance and inspection records, SCADA data, power curtailment, type certificates, and more.
The outcome is summarised in a final report defining the remaining useful life (RUL) of the plant and the conditions under which it can be achieved.
ERG, one of the largest onshore wind energy operators in Europe with a total installed capacity of 1.9GW, owns a fleet of wind turbines in Italy, France and Germany that are reaching 20 years of operation, the typical design life of a wind turbine.
Lifetime extension for ageing assets
To achieve the UL 4143 Standard certificate, UL performed a number of lifetime assessment and ageing plant analyses. ERG’s wind turbines were analysed to determine the RUL of the operational wind turbines.
The structural integrity of the turbines was also confirmed by means of load simulations performed to assess the safety and viability of extending turbine life. Additionally, a risk analysis evaluation and on-site inspection were performed to evaluate potential rising risks connected with the ageing turbines.
Michael Brower, vice president in the renewables division at UL, explains that turbines are designed for specific International Electrotechnical Commission wind class conditions based on average wind speed, extreme gusts, and turbulence, and typically for a 20-year expected lifespan.
“In many cases, the actual wind conditions are less aggressive than design conditions, and enough margin exists in the design that the turbine can safely operate well beyond its intended life,” said Brower.
UL holds a leading position in the independent lifetime extension evaluation market having recently surpassed 20GW assessed around the world for over 9,000 turbines, 160 wind turbine models from 27 manufacturers.
“The goals for UL are to support the sustainable, safe operation and to help maximise the life and value of their operating wind assets,” concluded Brower.
To read more about UL’s Lifetime Extension services, visit ul.com/renewables.
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