Control & Monitoring Petroleum Pipelines Corrosion
Control & Monitoring Petroleum Pipelines Corrosion
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Date
2015-04-27
Authors
el Hadi, Jawahir Abdel Wahid
Journal Title
Journal ISSN
Volume Title
Publisher
university Of Khartoum
Abstract
Corrosion is the deterioration of the metal as a result of its
reaction with the surrounding environment. The corrosion in the pipelines
that carry petroleum products is considered as the main problem facing
petroleum products pipelines which is as a result of its reaction with
environment that include soil, its salts and water. The corrosion resulting
from this reaction is called external corrosion which is more dangerous, there
fore it will be considered more than internal corrosion that occur between
pipe internal surface and petroleum product compounds.
The present study aimed to investigate the effect of different
environments and different kinds of soil through which pipeline buried
extends from Shagara (Khartoum) to Port Sudan, and it is also aimed at the
detection of the effectiveness of coating and cathodic protection system that it
has followed.
Also in this study chemical analysis has been done to examine the
sorts of soil surrounding the pipeline and its chemical properties. These
properties include soluble salts, degree of acidity, soil resistivity and relative
humidity, and have followed the pipe inspection that has been carried out by
Pipeline Integrity Inspection Company (PII) 2002-2003, and on the view of
study it can be evaluated. Through this study the obtained results show that
the soil in Khartoum, Shendi and Atabara areas is non corrosive because of
the low soluble salts and also its corrosion resistance is very high, and is dry
most of year months, moreover it is an alkaline soil.
The inspection results indicate that the corrosion is spreading
extensively in those areas because cathodic protection is poor. On the other
hand corrosion is very weak in Port-Sudan area, although the soil in this area
has a very low soil resistivity, very high insoluble salts, and high relative
humidity but cathodic protection is extensively used in this area. So the study
accessed that most corrosion occur under the tape, that means corrosion is not
as a result of coating defect surrounding the pipe which indicate that
corrosion is not connected to the circumstance surrounding the pipe, but it
may be as a result of the poor protection due to the less number of the
cathodic protection stations, or defects in the type of pipes material that is was
made of, manufacturing process, or coating process methods. A worthy study
and searching should be carried for this phenomenon. The study also
recommended some methods used on control and monitoring of pipeline
corrosion.
Description
85 Pages
Keywords
Control,Monitoring,Petroleum,Pipelines,Corrosion;
Basic Corrosion Reactions 5
2.3.2 Corrosion Rate 6
2.4 Corrosion Forms 9
Uniform Attack ;Galvanic or Two Metals Corrosion
itting ;Intergranular Corrosion ; Selective Leaching
Erosion Corrosion ;Stress Corrosion
;Pipelines Corrosion ;Atmospheric Corrosion ; Internal Corrosion
External Corrosion
Corrosion Control Methods
Coating
2Insulation joints