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Title: Corrosion assessment methods for pipelines with long blunt defects
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2349s
Date of Publication: 2015-06-01
Price: $25.00 US
Authors: Dr Xian-Kui Zhu
Abstract: CORROSION ASSESSMENT AND burst-pressure prediction for an aged pipeline with blunt defects are critical to its structural integrity. The commonly-used corrosion assessment methods, i.e. ASME B31G and RSTRENG, are the flow-stress- based criteria that are often conservative to use, but can be non- conservative in practical applications. Two improved methods – the PCORRC and LPC models – are based on the ultimate tensile stress, and so can predict much improved burst pressure for corrosion defects. However, the practice still showed certain non-conservatism of these newer models. This paper reviews and evaluates those commonly-used corrosion criteria for short and long blunt defects. In order to improve the existing criteria for predicting burst pressure for long blunt defects, three new theoretical models with consideration of strain-hardening response for corroded pipes are developed in terms of the Tresca yield criterion, the von Mises’ yield criterion, and the average-shear- stress yield criterion – a new multi- axial yield criterion that was proposed recently by the present author. The existing corrosion criteria and the proposed theoretical models are evaluated using experimental burst data for long machined defects and for long real metal- loss corrosion defects removed from service. It is found that ASME B31G is over-conservative for long defects, but it can be non-conservative for deep defects with intermediate lengths. RSTRENG is conservative for short defects. In contrast, PCORRC, LPC, and the proposed theoretical model predict reasonably conservative results for long corrosion defects.
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