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WASTE TO ENERGY


The Renergia plant in Switzerland


weld overlay (WMO) degradation. Te inspection of the HVTS/WMO interface showed that the area clad with IGS HVTS was no longer affected by corrosion. Unprotected Alloy 625 WMO and other vendor’s TS, on the other hand, both continued to degrade. It was decided to extend the scope and apply HVTS alloy cladding onto an additional ~20m2


area in 2019. Inspection


later that year, in August 2019, confirmed the following. Te areas protected with HVTS alloy cladding were not exhibiting any pitting corrosion or wastage. Adjacent unprotected Alloy 625 weld overlay sections were showing signs of wear and degradation. Markus Benz, head of maintenance at


Renergia Zentralschweiz, comments: “IGS Europe was selected in November 2017 to apply ~20m2


of its IGS material using


performance and capacity. Multiple IGS HVTS guns can be operated inside the boiler at the same time with no capacity limitations. Supported by comprehensive laboratory testing and extensive field experience, IGS HVTS alloy cladding has no issues with permeability or disbondment and can offer lasting protection, where other technologies fall short. Te test application results and additional references convinced the head of maintenance to choose IGS HVTS as the solution to his problem.


HVTS APPLICATION Te HVTS application took place in 2017 on a 20m2


area located on the left


membrane wall at the very low furnace of the moving grate WTE boiler above the refractory. Te plant also had a TS coating applied by a different vendor on the right- hand side of the membrane. Tese areas were then inspected in 2018 to determine whether HVTS and other vendors’ TS were successful at stopping the


its HVTS technology. Te team mobilised efficiently and performed within the tight requested schedule the expected scope of work. “After 10 months in operation, a short inspection of the waste to energy boiler was performed in September 2018 confirming the good performance of the coating. As a result, another area was ordered for application in January 2019. Early January a deeper inspection confirmed the good overall behaviour of the cladding after 14 months in operation. Te protected area has been doubled so that we expect to operate safely until our next turnaround in 18 months. IGS has successfully applied the contracted


Ageing weld overlay at the plant needed to be repaired


scope within the critical path in a highly professional manner, with reliable and transparent communication.” Ruedi Kummer, director of Renergia


Zentralschweiz, comments: “It seems that the idea to cover Alloy 625 with HVTS overlay could have enormous potential.”


Weld overlay protection: inspection and results www.engineerlive.com 45


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