A New Monitoring Method for Evaluation Cathodically Protected Large Diameter Prestressed Concrete Cylinder Pipe Using Real Size Coupons
| المصدر: | المجلة الجامعة |
|---|---|
| الناشر: | جامعة الزاوية - مركز البحوث والدراسات العليا |
| المؤلف الرئيسي: | Al Almughery, Abdulla (Author) |
| مؤلفين آخرين: | Ghblawi, Ezzddin .R (Co-Author), RejeibI, Sadek .S (Co-Author) |
| المجلد/العدد: | مج19, ع1 |
| محكمة: | نعم |
| الدولة: |
ليبيا |
| التاريخ الميلادي: |
2017
|
| الشهر: | مارس |
| الصفحات: | 27 - 46 |
| رقم MD: | 1262913 |
| نوع المحتوى: | بحوث ومقالات |
| اللغة: | الإنجليزية |
| قواعد المعلومات: | EduSearch, EcoLink, IslamicInfo, AraBase, HumanIndex |
| مواضيع: | |
| رابط المحتوى: |
الناشر لهذه المادة لم يسمح بإتاحتها. |
| المستخلص: |
The effectiveness of the cathodic protection (CP) system for large diameter prestressed concrete cylinder pipe (PCCP) system is monitored only by indirect methods, known as "criteria for protection". However, for large diameter PCCP their exist t a problem on PCCP cathodic protection system including, difficulty to gasp corrosion condition of PCCP, whether it is in progress or not, and hard to evaluate the effectiveness and adequacy of the cathodic protection system. The principle causes for these problems is due to the large size of PCCP pipe and inaccessibility of the pipe and prestressing wire makes evaluation difficult, costly and impractical to determine steel potential at the circumferential positions of the pipe..No reference electrodes are installed on the surface of PCCP and the overland surveys (CIPS) can only measure some form of weighted mean steel potential. Also the variation in soil resistivity along the PCCP pipeline route will have a noticeable effect on the performance of cathodic protection system and the interpretation of the performance monitoring result. The mixed nature of the pipeline that may exist, i.e., combination of coal tar epoxy coated PCCP pipe and non-coated pipeline sections. Such problems associated with data measurement and interpretations of the CP system are usually overcome by using corrosion coupons (small size test piece). Whereas coupons have provided sterling service in the process industry on the whole, an application to large and very long PCCP pipeline is deemed impractical and non-productive. We propose in this paper to install real scale coupons which consist of actual size PCCP pipes. The aim of this new monitoring technique is to confirm the effectiveness and adequacy using zinc anodes on the performance of passivated, corroded and coal tar coated PCCPs which are buried in various soil resistivity ranges. |
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