Read about STARTPROF pipe stress analysis software
When analyzing vacuum sections, pipe crosssection local stability to excess external pressure P_{work} must be checked. Analyses are done using GOST 323882013 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 StartElements analysis by using the toolbar icon in that file.
Property 
Description 
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 323882013, stability safety margin is set as

Operation pressure, P 
Operation pressure in operation state. Set for all standards except SNIP 2.05.0685. 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.
Pipe. Aboveground > Strength Analysis of Vacuum Element