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Plastic Limit Load Analysis of Cylindrical Pressure Vessels with Different Nozzle Inclination

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Abstract

Sudden change in geometry of pressure vessel due to nozzle cutout, leads to local stress concentration and deformation, decreasing its strength. Elastic plastic analysis of cylindrical pressure vessels with different inclination angles of nozzle is important to estimate plastic limit load. In the present study, cylindrical pressure vessels with combined inclination of nozzles (i.e. in longitudinal and radial plane) are considered for elastic plastic limit load analysis. Three dimensional static nonlinear finite element analyses of cylindrical pressure vessels with nozzle are performed for incremental pressure loading. The von Mises stress distribution on pressure vessel shows higher stress zones at shell–nozzle junction. Approximate plastic limit load is obtained by twice elastic slope method. Variation in limit pressure with different combined inclination angle of nozzle is analyzed and found to be distinct in nature. Reported results can be helpful in optimizing pressure vessel design.

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Abbreviations

d :

Nozzle diameter (mm)

D :

Shell diameter (mm)

l :

Nozzle length (mm)

L :

Shell length (mm)

P l :

Limit pressure (MPa)

P A :

Allowable pressure (MPa)

P Φ :

Plastic limit pressure by TESM (MPa)

P TIM :

Plastic limit pressure by TIM (MPa)

o :

Height of nozzle head (mm)

O :

Height of vessel head (mm)

r :

Nozzle radius (mm)

t :

Nozzle thickness (mm)

R :

Shell radius (mm)

T :

Shell thickness (mm)

α :

Nozzle inclination angle in section XX (°)

β :

Nozzle inclination angle (°)

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Authors and Affiliations

  1. Escorts Agri Machinery, Faridabad, 121003, Haryana, India

    Anupam Prakash

  2. Sardar Vallabhbhai National Institute of Technology, Surat, 395007, Gujarat, India

    Harit Kishorchandra Raval & Dipak Bapu Pawar

  3. C. K. Pithawalla College of Engineering and Technology, Surat, 395007, Gujarat, India

    Anish Gandhi

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  1. Anupam Prakash
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  2. Harit Kishorchandra Raval
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  3. Anish Gandhi
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  4. Dipak Bapu Pawar
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Correspondence to Anupam Prakash.

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Prakash, A., Raval, H.K., Gandhi, A. et al. Plastic Limit Load Analysis of Cylindrical Pressure Vessels with Different Nozzle Inclination. J. Inst. Eng. India Ser. C 97, 163–174 (2016). https://doi.org/10.1007/s40032-015-0210-0

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  • DOI: https://doi.org/10.1007/s40032-015-0210-0

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