Cleaning Of Pipeline.pdf

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Cairo University Faculty of Engineering 4 th Year Mechanical Power Engineering Department Pipeline&Networks Submitted to: Dr\ Mostafa El Sallak Prepared by Wael Kamal Mohamed Mahmoud SEC:6 B.N:25 2 CONTENTS o Cleaning Of Pipeline 3 The Importance Of A Clean Pipeline 3 Typical Cleaning Methods 3 important reasons to have a clean pipeline 4 Why Clean Your Pipeline? 4 These methods include 5 PIGGING MEDIUMS 5 Liquid 5 Gas 6 Multiphase Fluid 6 PIG LAUNCHING AND RECEIVI
  Cairo UniversityFaculty of Engineering4 th  Year Mechanical Power Engineering DepartmentPipeline&Networks Submitted to: Dr\ Mostafa El Sallak  Prepared by Wael Kamal Mohamed Mahmoud  SEC:6 B.N:25  2 CONTENTS o Cleaning Of Pipeline 3The Importance Of A Clean Pipeline3Typical Cleaning Methods3important reasons to have a clean pipeline4Why Clean Your Pipeline?4These methods include5PIGGING MEDIUMS5Liquid 5Gas6Multiphase Fluid 6PIG LAUNCHING AND RECEIVING8High pressure water cleaning8Flushing9Hydro Blasting9Chemical cleaning9Chemical treatment for improved pipe line flushing9References  3 The Importance Of A Clean Pipeline Today, most transmission pipelines are cleaned routinely with various types of cleaning pigs. However, the effect of this routine cleaning is rarely monitored and theinternalcleanliness of a line is seldom known. The most often asked question is “When is a pipeline clean?” This question can only be answered after one determines the need for cleaning theline. This article will identify thelevels of cleanliness required for the different applications. It will also address.the different methods used to clean pipelinesBoth mechanical cleaning andchemical cleaning will be discussed along with the benefits of both. Inline inspection, corrosion control and increased flowefficiency are the primary reasons for cleaning pipelines. The level of cleanliness and the cleaning approach will vary with each reason.There are certain measures one can use to gauge line cleanliness. The most commonare: flow rates, differential pressure measurements, inspection of filters or separators,internal measuring with geometry pigs, condition of cleaning fluids or simpleinspection of cleaning pigs during their removal from receivers. Typical Cleaning Methods:-  Hydrocarbon flush & end separation  Pigging for deposit removal-Magnetic pick-up pigs -Scraper and brush pigs  Chemical flush - Water / Surfactant mixture - Acid Clean  There are several important reasons to have a clean pipeline  Increased throughput  Increased operating efficiency  Reduced internal corrosion  Safer to operate  Lower maintenance cost  Longer pipeline life  Achieve accurate corrosion inspection resultsAll of the above reasons equate to lower operating expenses and higher profits.Therefore, the importance of a clean pipeline becomes obvious to the pipelineoperator. If pipelines are notcleaned and maintained well, a larger loss of profits might be the result.There is a commercial in the United States where an automobile owner is gettingready to pay a high price to have his engine completely rebuilt. The reason for therebuild is lack of or no maintenance on the automobile during its operation. Theowner of the repair shop makes the statement: “You can pay me now or you can payme later.” The point is that if you don’t take care of your pipeline today, it will costyou more tomorrow.  4 Why Clean Your Pipeline? We can all agree it is very important to clean and maintain your pipeline. However, asstated before, the most often asked question continues to be “When is a pipelineclean?” There are different levels of cleanliness and, depending on your reason for cleaning,different levels of cleaning required. Forty years ago, lines were cleaned withmechanical cleaning pigs, primarily for increased flow throughput. We all know thatthe cleaner that a line is, the more gas or liquid can be flowed through the system.Internal cleaning with mechanical pigs increases the pipe ID by removing the internal deposit build-up. It also smoothesthe interior surface which reducesthe drag or coefficient of friction. A low coefficient of friction meansincreased flow.The justification to clean these lines was not to increase throughput but to reduce theoperating cost. However, it is common to see a dramatic increase in flowwhen routine online cleaning programs are conducted.There are several methods used to evaluate the effectivenessof a cleaning program. These methods include  The clean liness of the cleaning pig  The amount of debris collected in the filter or strainers following a pig run  The reduction of operating pressure  The increase in flow rate  Improved product quality  A reduction in the consumption of compressor or pump fuel  A successful corrosion inspection  The reduction in corrosion rates of corrosion couponsAll of these methods are commonly used today. Depending on your operation the bestmethod used will be determined.
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