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We have two installations – one with four 50SGs and one with two 34SGs. Both sites have silencers made of Cor-Ten B manufactured by JTK Power. These sites have been commercial for about 1.5 years. We are located in Tallahassee, Florida (a very hot/humid environment).
About six months after commissioning, we noticed large flakes of rust coming out of the stack during engine startups after the engines were shut down for an extended period of time (about a week). Some of the flakes were 6″ x 6″ and .024″ thick.
I submitted a warranty claim with Wartsila and they said the was rust from the manufacturing process – they referred to it as ‘milling scale’. They said it would stop after a year of two of operation, after the Cor-Ten built up a protective layer of rust.
Have any other users experienced this? Do the flakes of rust stop shedding from the stack after a year or two?
MBLP MEC encountered the same flaking condition early on. The flakes were very large and almost looked like brown snow coming down. We reported it via a claim on each of our three 18V50DF engines. The Wartsila response was the same as what you received:
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<p style=”margin: 0in 0in 0pt;”><span lang=”EN-GB” style=”mso-ansi-language: EN-GB;”><span style=”color: #000000; font-family: Calibri;”>Below is the comment from TS in regards to 3 claims:</span></span></p>
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<p style=”margin: 0in 0in 0pt;”><span style=”color: black; font-family: ‘Arial’,sans-serif; font-size: 8.5pt;”>According to the provided information and samples.
The ejected material is magnetic and seems to be milling scales from the manufacturing of the exhaust gas ducts steel pipes.
The stack should be from Corten B.
Corten has the function that after significant hot / dry cycles the steel form a protective layer.
This site has short running hours, so the problem should cure over time as the milling scale is lost and the protective layer is formed.</span></p>
John
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