JNTU
JNTU B.Tech III PIPELINE ENGINEERING Previous Question Paper (April - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
PART - A
State types of corrosion that can occur in sour gas pipelines.
Answer
The primary types of corrosion in sour gas pipelines are Sulfide Stress Cracking (SSC), Hydrogen Induced Cracking (HIC), and Stress Oriented Hydrogen Induced Cracking (SOHIC), all driven by the presence of hydrogen sulfide (H₂S) and moisture.
What are objectives of pipeline integrity program?
Answer
The main objectives are to ensure safe and reliable pipeline operation, minimize environmental impact, comply with regulatory safety standards, and extend the operational life of the asset by proactively identifying and mitigating risks such as corrosion, mechanical damage, or fatigue.
Discuss flow regimes in high pressure gas transmission lines.
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Illustrate fully turbulent/partially turbulent zones by the Prandtl-Von Karman equation.
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Discuss thermodynamics of polytropic gas compression.
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Explain the significance of centrifugal compressor performance curve.
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Comment on the purpose of transient analysis.
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Discuss joint design for pipes of unequal wall thickness.
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Mention various types of pipeline pigs.
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Mention different pipeline protection techniques during offshore operations.
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PART - B
Mention various steps involved in engineering survey for laying the pipelines.
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Mention various geotechnical considerations and guidelines for laying of pipelines.
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Discuss the effect of supply/demand scenario on pipeline system design.
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State various types of pipeline repair methods.
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Determine maximum Reynold number for which flow regime remains partially turbulent, given a transmission factor of square root (1/f = 18). Use Prandtl-Von Karman equation.
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Using Nikuradse equation, determine transmission factor for fully turbulent flow, D = 28 inches, effective roughness = 250 micro inches.
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Discuss the concept of pipeline segment looping.
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Write the applicability and limitations for Weymouth equation.
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Discuss the role/purpose of air intake system in a compressor.
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What would be the gas discharge temperature assuming significant change in compressibility factor for following data? T1 = 520 0R; P1 = 250 psia, P2 = 750 psia; K = 1.5, G = 0.65.
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What is the effect of intercooler pressure drop on the compression ratio?
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Which types of pumps are used for Trunkline pipeline stations and why?
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Mention few characteristics of centrifugal pumps.
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What is the significance of NPSHA and also write the expression for it.
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Write a short note on pump station piping design.
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Discuss selection criteria for various types of pigs.
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What are the general points and considerations under commissioning planning.
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Mention various operations leading to corrosion of pipelines.
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