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51313-02343-Pipeline Risk Assessment for the Purpose of ICDA in a Large Gas Gathering T&D System

Picture for Pipeline Risk Assessment for the Purpose of ICDA in a Large Gas Gathering T&D System
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Product Number: 51313-02343-SG
ISBN: 02343 2013 CP
Author: Nima Tajallipour
Publication Date: 2013
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In this paper a methodology to assess the risk of internal corrosion for a large gas gathering transmission and distribution piping network is proposed. Due to the high number of pipelines present in the system performing Internal Corrosion Direct Assessment (ICDA) for all the gas pipelines is appear to be unrealistic and unfeasible therefore an approach based on phase-envelope analysis for the transmitted gas is proposed to determine the water carrying capacity of the transmitted gas and also to indicate pipelines which are susceptible to water condensation and drop-out based on their operational conditions. In addition the effect of heavy hydrocarbon gas molecules (C6+) over the shape of the hydrocarbon phase envelope is investigated and the probability of forming a liquid hydrocarbon phase is evaluated.


Some of the challenges such as prediction of the hydrocarbon bubble and dew point at pressures and temperatures close to the gas mixture’s critical point are also discussed. Obtained results highlight the importance of performing reliable gas analyses at different locations in a large piping network especially at regions close to the compressors or the gas dehydration units and demonstrate the success of the proposed approach to systematically evaluate the risk of internal corrosion for a large gas transmission distribution network during different operational seasons.
 

In this paper a methodology to assess the risk of internal corrosion for a large gas gathering transmission and distribution piping network is proposed. Due to the high number of pipelines present in the system performing Internal Corrosion Direct Assessment (ICDA) for all the gas pipelines is appear to be unrealistic and unfeasible therefore an approach based on phase-envelope analysis for the transmitted gas is proposed to determine the water carrying capacity of the transmitted gas and also to indicate pipelines which are susceptible to water condensation and drop-out based on their operational conditions. In addition the effect of heavy hydrocarbon gas molecules (C6+) over the shape of the hydrocarbon phase envelope is investigated and the probability of forming a liquid hydrocarbon phase is evaluated.


Some of the challenges such as prediction of the hydrocarbon bubble and dew point at pressures and temperatures close to the gas mixture’s critical point are also discussed. Obtained results highlight the importance of performing reliable gas analyses at different locations in a large piping network especially at regions close to the compressors or the gas dehydration units and demonstrate the success of the proposed approach to systematically evaluate the risk of internal corrosion for a large gas transmission distribution network during different operational seasons.
 

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