October 2014, Vol. 241, No. 10

Features

Corrosion Management Of Duplex Stainless Steel Gas Flowlines

The most commonly used materials for gas flowlines are carbon steel (CS) and duplex stainless steel (DSS). Selection of flowline materials should take into account the service for which the flowline is intended, the operating envelope and the life cycle costs (LCC). For highly corrosive environments corrosion-resistant alloys (CRAs), in particular DSS, remains the most cost-effective option since the risk of corrosion failure on CS lines is high and use of corrosion inhibition with CS is often either impractical, costly or poses too high a risk. However, DSS can still be susceptible to internal and external corrosion threats in both surface and buried environments. There are occasions whe

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