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ROHR2 is a program system for the structural analysis of piping systems, covering stresses, displacements, support loads and nozzle loads.
ROHR2 is a program system for pipe stress analysis that is widely used in German-speaking countries. It represents a piping system as a three-dimensional frame of beam elements and, for defined load cases, calculates displacements, internal forces, stresses and the loads on supports and connections.
The stresses are then assessed to a selected code: the program compares the calculated values with the allowable ones and reports the utilisation for each component and check.
The sequence is the same for every pipe stress analysis, whatever the size of the system.
The normal case is static analysis: weight, internal pressure, thermal expansion and external loads in their combinations. Beyond that, dynamic questions can be examined – natural frequencies and mode shapes, harmonic excitation, earthquake by response spectra, and time-dependent loads such as pressure surge.
For local checks at nozzles, branches or welded attachments the beam model is not sufficient. The module ROHR2fesu supplements individual components with a finite element shell model for this purpose.
Stress checks can be carried out to the common codes, among them EN 13480 and the ASME B31 series. Which code applies is determined by the location of the plant, the Pressure Equipment Directive and the specification of the operator.
An analysis is carried out consistently to one code. Material values, stress intensification factors and allowable values belong together and cannot be mixed between codes.
A calculation model is as good as its assumptions. Whether a support is really rigid, how large the friction is and how far an equipment nozzle moves in operation – the program does not know. It calculates with what has been entered.
Plausibility checks are therefore part of the work. Does the sum of the support reactions match the weight? Does the deflected shape match expectation? Does every support carry load in every case, or does the line lift off? These questions are answered by the engineer, not by the software.
What Entracon offers here is on the matching page.
See what we offer| Area | Input | Result |
|---|---|---|
| Geometry | Routing, dimensions, components | Deflected shape, displacements per node |
| Material and code | Material values, temperatures, pressures | Stresses and utilisation per check |
| Supports | Type, position, stiffness, friction | Support loads per load case, spring hanger data |
| Connections | Nozzle displacements, allowable loads | Nozzle loads compared with the allowable values |
An analysis can be reviewed when input, load cases, code and results are documented traceably. The program produces the documents for this. Whether the model represents the plant correctly is the responsibility of the author.
No. The results are handed over as a report with tables and plots. For later modifications to the line, however, it is helpful if the calculation model is handed over as well.
ROHR2 analyses the whole piping system as a beam model. ROHR2fesu examines individual components of it as a finite element shell model where local stresses are required.
With the same model, loads and code the results should agree. Differences almost always arise from differing assumptions – support stiffness, friction, load case combination – and not from the software.
One short conversation usually settles more than three quotations. Call or write — you will reach an engineer directly.
Start typing – for example “balancer”, “SAP” or “pipe stress”.
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