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- W2007490954 abstract "Abstract The scope of this paper is to discuss the background, design challenges, online damage assessment, repair selection and sustainment efforts undertaken to mitigate large scale caustic stress corrosion cracks in the common low pressure steam system. Caustic ingression in the steam system through contaminated boiler feed water used for de-superheating caused multiple cracks in the steam piping systems. Crack locations were predominantly visible at the longitudinal and circumferential weld joints of the common utilities steam header. Cracks were observed on the intrados and extrados of elbow joints, tee joints and straight pipe sections of the large size (52 and 48) header. Cracks were also observed downstream of significant capacity de-super heaters and upstream of steam users in the process units. The common steam system is utilised for process heating, pump and compressor drivers. Unplanned shutdown of the common steam header system for repair or replacement would require a multiple mega train outage and majour business impact. Crack propagating beyond critical length will lead to catastrophic failure of the steam system. Online solutions needed to besafe to install,designed for sustainment for over 2 years until a permanent repair could be affected, andnot impose any risk of further damage during installation. Background Two mega LNG plants (7.8 Mmtpa/ plant) and one of the Gas plants (1350MmScfd) share a common steam system for process heat and pump / compressor drivers. Three different steam systems are operating in these facilitiesHigh Pressure : 41.3 bar(g) at 384ºCMedium Pressure : 15 bar(g) at 230ºCLow Pressure : 5.1 bar(g) at 155ºC" @default.
- W2007490954 created "2016-06-24" @default.
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- W2007490954 date "2014-01-19" @default.
- W2007490954 modified "2023-09-23" @default.
- W2007490954 title "Online Inspection & Clamping of Large Size Steam Headers (52" @default.
- W2007490954 doi "https://doi.org/10.2523/iptc-17469-ms" @default.
- W2007490954 hasPublicationYear "2014" @default.
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