Федеральное государственное автономное

Description of main gas pipeline coatings

Студент:

Группа	ФИО	Подпись	Дата
2БМ6А	Машуков Г.И.		25.05.2018

Консультант отделения НД

Должность	ФИО	Ученая степень, звание	Подпись	Дата
профессор	Медведев В.В.	д.ф.-м.н., профессор		25.05.2018

Консультант – лингвист отделения ШБИП

Должность	ФИО	Ученая степень, звание	Подпись	Дата
доцент	Коротченко Т.В.	к.ф.н., доцент		25.05.2018

Introduction
When people talk about pipeline coatings, they think of them primarily as a barrier to aqueous corrosion. While that is a major role, coatings do so much more than just “block moisture.” Some other functions include the following:

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  Separating the pipeline from corrosive chemicals, gases, and microbiologically influenced corrosion (MIC).
  
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  Reducing the amount of cathodic protection current required for corrosion mitigation.
  
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  Protecting piping against Corrosion Under Insulation (CUI).
  
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  Reflection of thermal radiation and insulation of the pipe contents from heat loss or heat gain.
  
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  Reducing the friction between the liquid media and the pipe wall.
  
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  Resisting abrasion and impact during transportation and burial.
  
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  Controlling pipe buoyancy in offshore applications.
  
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  Reducing or preventing deposit buildup, thus boosting production rates.
  
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  Passive fire protection (generally cementitious or intumescent coatings).
  

For example, it is widely perceived that internal pipeline coatings are there for corrosion preventiondbut they are just as useful as “flow coats.” That is to reduce the friction between the viscous crude and the internal pipe wall. This allows more throughput and hence greater production rates.
However, the two functions cannot be simply interchanged. A flow coat can be effective from 40 mm. That is, just enough to cover the “hills and valleys” of the steel surface roughness. But to operate as a meaningful corrosion barrier, it needs a minimum of about 125 mm! In addition to fulfilling such tasks, coatings also have to exhibit economy, functionality, and practicality.