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Useful Program Features
The Knowledge Base includes technical articles on a wide array of structural analysis and design topics.
These articles are intended to help you navigate through the Dlubal programs, learn efficient tips and tricks, and provide further insight into the program features.
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Pipes Under Internal Pressure Load
Pipe systems are exposed to a large number of loadings. Internal pressure is one of the most governing loads. Therefore, this article describes the stresses and deformations resulting from a pure internal pressure load in the pipe's wall and for the pipe respectively.
Load Combinations for Pipe Stresses due to Occasional Loads
The add-on modules RF-PIPING and RF-PIPING Design allow you to design piping systems according to EN 13480-3 , ASME B31.1 and B31.3. In the case of the European standard, the determination of pipe stresses is based on the formulas of Section 12.3 Flexibility analysis. Depending on the stress type, one or more resulting moments is applied without regard to each other. This differentiation occurs when determining the stresses due to occasional loads, for example.
Wall Thickness Allowances
For stress calculations, some standards use ‘analysis wall thickness’, which we get by subtracting corrosion, abrasion allowance, manufacturing allowances (threading, grooving, etc.), and mill tolerances from nominal wall thickness. All needed values can be entered in the ‘Piping Cross‑Section’ dialog box, ‘Stress Analysis Parameters’ tab.
Automatic Load Combination
Like in RFEM, load combinations can be automatically generated in RF‑PIPING. This feature is activated by default and creates the recommended load and result combinations for piping design. It is necessary to assign the relevant action category to load cases in order to generate correct combinations. For this, there are new action categories implemented specifically for loads on piping.
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