Piping systems are subjected to various loadings such as internal pressure, weight of pipe, fittings, insulation and process fluids, wind loads, thermal expansion / contraction. These loadings must be taken into account to ensure that the piping system meets the requirements of ASME B31.3 / B31.4 and does not impose excessive loadings on equipment nozzles or the structure. The objective of this stress analysis is to confirm the pipe support integrity and to ensure that the piping system is flexible and the pipe stresses are within the allowable limits.
Scope of work defined is to do pipe stress analysis as per ASME B 31.4 for pipeline 20”- Mono Ethylene Glycol.
The loads and Load Combinations considered for this analysis are mentioned below:
- Dead load
- Pressure Load
- Thermal Load
- Combination of dead, pressure & thermal loads as an operational case
- Combination of dead and pressure loads as a sustained case
The 3D FEM Modelling of the piping. The specifications and parameters necessary to do the modelling is derived from the reference drawings and other inputs provide by client. The components are appropriately modelled accounting for their weights and stiffness.
The buried piping network with the Steel pipes, analyzed as per ASME B 31.4 is found to be safe after comparing the stresses and deflection in the network.
- 20” Underground Pipe SS 304 Sch 30 – 9500 meters between Scrapper Launcher & Scrapper Receiver has been Modeled and Analysis through software in ASME 31.4 Code.
- The Pipe wall thickness and AWWA Calculation has been done manually as per API-RP-1102.
- Complete thickness calculations for U/G Pipe with all checks such as cyclic stress due to earth load, circumferential stress due to internal pressurization, allowable Barlow stress, principal stress, fatigue test-gitrth weld/longitudinal weld, etc as per API RP 1102.