Impact of Prolonged Exposure to Sour Service on the Mechanical Properties and Corrosion Mechanism of Nace Carbon Steel Material Used In Wet Sour Gas Multiphase Pipeline in Qatar

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

Oil and Gas industries involve severe corrosive/sour environmental conditions dueto H2S and CO2 and moisture content. The National Association of Corrosion Engineers, NACE,has developed standards to enable the users to select suitable material for given sourconditions by means of laboratory testing. This thesis takes up the study of a failed (corroded)piping sample (API-5L-X65) removed from a pipeline after 15 years of service. Mechanicalproperties of the removed samples (both corroded as well as non-corroded) wereevaluated and compared. Pitted samples were analyzed using a scanning electronmicroscope coupled with energy dispersive X-ray (SEM/EDS) for understanding themorphology of the deposits. EDS results were further compared using XPS analysis. Opticalmicroscopy was used to compare the microstructure of the corroded sample near thesurface exposed to the service environment and away from it. Micro-hardness was carriedout on the cross-section of the removed sample to understand any evident hardness variationfrom ID to OD of the piping. The electrochemical behavior using ElectrochemicalImpedance Testing (EIS) of the corroded sample (with corrosion scales) was tested in 5%sodium sulfate solution, and the results were compared with the un-corroded part (polished)of the same sample. All the results suggest that prolonged service exposure has resultedin the development of micro defects, resulting in the reduction of strength and impacttoughness along with the reduction in the hardness at the exposed surface of the corrodedpiping. Understanding the material behavior due to long-term exposure will surely help the industry in repair/replacement planning while extending the usable design life of thematerial. The results acheived during this thesis, will surely pave the way for oil & gasindustry to develop further ways to monitor the changes in the critical material propertieswhen exposed to sour services

روابط وملفات

التعريف والنوع

رقم الوثيقة

f4ec200f-e576-46d1-8040-53ad0b16b6ab

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

2018198_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":" Manoj Yadav","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"ابو بكر عبدالله","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

Impact of Prolonged Exposure to Sour Service on the Mechanical Properties and Corrosion Mechanism of Nace Carbon Steel Material Used In Wet Sour Gas Multiphase Pipeline in Qatar

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

ابو بكر عبدالله

الإعداد

Manoj Yadav

الاقتباسات الببليوغرافية