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Oilsand bitumen crudes, characterized as corrosive by the classical naphthenic model, are producing negligible naphthenic acid corrosion in crude and vacuum units after more than 50 years of operation. A new theory proposes that the corrosivity of naphthenic acids in Athabasca oilsand bitumen crudes is a function of its molecular characteristics.
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ASTM Grade 29 titanium alloy (UNS R56404) has been traditionally used for oil and gas stress joints (TSJ). However, given the general difficulty of processing this type of alloy in the beta quenched condition and more recently the exorbitant increase in alloying costs due to the ruthenium, a new solution is required if titanium is to be considered for future applications. This 475 alloy was developed to meet geothermal requirements to replace Grade 29 seamless casing. The essential material properties of Grade 29 in bulk and welded condition as used for titanium stress joints were reported by Shutz et al.
Case histories will illustrate failures that occurred in components that were made of different brass alloys in water and steam systems. Recommendations will be made to mitigate the damage that occurred in each case.