Vacuum Piping Cross-section Buckling Analysis

Read about START-PROF pipe stress analysis software

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When analyzing vacuum sections, pipe cross-section local stability to excess external pressure Pwork must be checked. Analyses are done using GOST 32388-2013 with an adjustment to No.1.

Stiffening rings can be placed at set interval along the pipe axis to increase stability for external pressure.

K - stability factor, Ky stability factor under external pressure load, axial force, bending moment, shear force.

Input data can be copied using the toolbar icon and  inserted into any other Start-Elements analysis by using the toolbar icon in that file.

Input data



External diameter, Da

External pipe diameter, D

Operation temperature

Operation temperature. More...

Mill tolerance

Mill tolerance at the time of production. More...

Corrosion and wear allowance

Corrosion and wear allowance (working mill tolerance) for wall thickness. More...

Stability safety margin

Based on GOST 32388-2013, stability safety margin is set as

  • 2.4 for operating mode

  • 1.8 for test and installation mode

Operation pressure, P

Operation pressure in operation state. Set for all standards except SNIP 2.05.06-85. More...

Steel grade

Pipe material from the materials database


If "pressure" is selected, allowable external pressure under which stability is maintained can be calculated by setting nominal wall thickness. If "wall thickness" is selected, minimum allowable wall thickness can be calculated by setting the maximum external pressure (vacuum) and test pressure. In this case, stability analysis for vacuum and strength under test pressure is checked.

Menu Access

Pipe. Above-ground > Strength Analysis of Vacuum Element