Pipeline stress analysis — buried, above ground and stations
Calculations to ASME B31.4, B31.8, EN 1594 and NEN 3650 for transmission lines, station piping and pig-trap areas, including the transition between them.
A pipeline is restrained by the soil along its whole length; where it rises into a station, a valve pit or a pig trap, that restraint stops and the accumulated thermal and pressure growth has to go somewhere. Most pipeline problems sit exactly there — at the virtual anchor, the bends near the surface, the anchor block, the first supports above ground.
The studio models soil–pipe interaction, calculates anchor-block loads and checks the above-ground piping together with the buried section, so that station design and pipeline design are consistent. Experience covers natural gas networks, 48-inch water lines, CO₂ transport and hydrogen-ready systems.
What the package covers
- Buried pipelines: soil springs, friction, virtual anchor length, upheaval and lateral stability at bends.
- Transition areas: anchor blocks, valve pits, insulating joints, above-ground stations.
- Pig-trap and launcher/receiver areas, metering and compressor stations.
- Crossings, settlement and imposed displacements.
- Gas, water, CO₂ and hydrogen service; code checks to B31.4, B31.8, EN 1594 or NEN 3650.
Typical deliverables
- Pipeline and station calculation models.
- Soil parameters and assumptions register.
- Anchor-block and support loads.
- Calculation report with code compliance and recommendations.
Pipeline references
7 documented assignments in this field. All references →
| Project | Contract chain | Country | Calculation scope |
|---|---|---|---|
| Porthos CO₂ compressor station Pipelines | Bonatti / Porthos | Netherlands | CO₂ pipeline and pig-trap area calculations; NEN 3650; Ple4Win. |
| Rumaila water pipeline Pipelines | Bonatti / Rumaila Oil | Iraq | Approx. 100 km, 48-inch line and eight stations; ASME B31.4. |
| Sulmona gas plant Pipelines | Saipem / SNAM | Italy | Gas transmission and station piping calculations; EN 1594. |
| Messina revamping Pipelines | Saipem / SNAM | Italy | Gas infrastructure piping calculations; EN 1594. |
| Malborghetto revamping Pipelines | Saipem / SNAM | Italy | Gas infrastructure piping calculations; EN 1594. |
| Enna ElCo TC4 revamping Pipelines | Saipem / SNAM | Italy | Compressor-station piping calculations; EN 1594. |
| West Mabrouk Pipelines | Bonatti | North Africa | Buried-pipeline calculations; ASME B31.4. |
Frequently asked questions
Do you work to NEN 3650 for the Dutch market?
Yes — the Porthos CO₂ project (pipeline and pig-trap area) was calculated to NEN 3650 with Ple4Win.
Can the station piping and the pipeline be analysed together?
Yes, and it is recommended: the buried section is modelled far enough to reach the virtual anchor, so the loads at the station boundary are realistic.
What soil data do you need?
A geotechnical report or at least soil type, cover depth, unit weight and friction angle; where data are missing, bounding assumptions are agreed and documented.
Need a stress analysis, a calculation package or a second opinion?
Send the line list, isometrics or model and the applicable code: you receive a defined scope and a fixed-price proposal.