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P91 Piping: A Panacea-Turned-Nightmare for Power Plants?

Posted March 01, 2016 10:10 AM by wagman262

Victor Rogers discusses the promise and peril of P91 alloy used for high-energy piping in many fossil-fired power plants. The alloy at first was seen as something of a panacea for one set of problems. It presents some potentially dangerous problems of its own that Rogers says need to be clearly understood.

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Brave Sir Robin
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Re: P91 Piping: A Panacea-Turned-Nightmare for Power Plants?

03/01/2016 10:09 PM

Sounds like an analogy to the gray poly butyl piping fiasco for homeowners 25 years ago.
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James Stewart
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Re: P91 Piping: A Panacea-Turned-Nightmare for Power Plants?

03/02/2016 10:02 AM

I think the article in the first link is spot-on. It is not really though, not just maintenance protocols that have to match up with the metallurgy, it included operational protocols to avoid the conditions that defeat (either by water chemistry or by fire side issues, or by overheating without water) P91 micro-crystalline structure.

Wouldn't be great if an alloy could be made with no micro-crystalline structure, completely isotropic in all directions, and with a completely temperature independent tensile and elongation strength at all temperatures below a known and well specified value? Unfortunately, that does not really exist in the real world.

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