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Monday, March 15, 2010: 1:50 PM
214 A (Henry B. Gonzales Convention Center)
A methodology was developed to identify and choose the most resistant, cost-effective material and also appropriate remedial corrosion inhibition and protection methods by using “ECE”, “FreeCorp”, PipePredict 3.0” and “NORSOK M-506” corrosion prediction models in dry and wet oil & gas pipeline containing H2S and/or CO2.
Since for identifying the Corrosion Allowance in the Basic Design Stage of oil and gas projects, Corrosion Rate Prediction is a critical fundamental step, early in 2008 a study project was initialized in Nargan Engineers and Constructors aiming to choose the most reliable corrosion prediction model in order to quantify the corrosion rate in their pipeline projects.
Surprisingly, after examination of mentioned models it has been found out that with utilizing several models in similar environments, attained predicted values were diverse even far from the measured practiced ones. Thus it has been decided to establish a simple methodology and flowchart in order to compromise capabilities of each model and its advantages in comparison with others in a specified environment; hence by employing combination of all the models in a synergistic manner the most reliable corrosion rate can be achieved.
Methodology is based on the following steps:
· Identifying the features, capabilities and also limitations of each Corrosion Prediction Model.
· Identifying and prioritizing the most critical variants in corrosion rate prediction in each given environment (Sour / Sweet)
Consequently according to the mentioned steps and also project restrictions by implementation of economical analysis on each of these critical variants, it will be decided to take the most cost-effective remedy action on the most critical corrosion rate variants in order to achieve the least possible corrosion rate. Ultimately this approach has been implemented in Nargan’s current projects and results appeared to be satisfactory enough.
Since for identifying the Corrosion Allowance in the Basic Design Stage of oil and gas projects, Corrosion Rate Prediction is a critical fundamental step, early in 2008 a study project was initialized in Nargan Engineers and Constructors aiming to choose the most reliable corrosion prediction model in order to quantify the corrosion rate in their pipeline projects.
Surprisingly, after examination of mentioned models it has been found out that with utilizing several models in similar environments, attained predicted values were diverse even far from the measured practiced ones. Thus it has been decided to establish a simple methodology and flowchart in order to compromise capabilities of each model and its advantages in comparison with others in a specified environment; hence by employing combination of all the models in a synergistic manner the most reliable corrosion rate can be achieved.
Methodology is based on the following steps:
· Identifying the features, capabilities and also limitations of each Corrosion Prediction Model.
· Identifying and prioritizing the most critical variants in corrosion rate prediction in each given environment (Sour / Sweet)
Consequently according to the mentioned steps and also project restrictions by implementation of economical analysis on each of these critical variants, it will be decided to take the most cost-effective remedy action on the most critical corrosion rate variants in order to achieve the least possible corrosion rate. Ultimately this approach has been implemented in Nargan’s current projects and results appeared to be satisfactory enough.