A supplier of large diameter Fiberglass Reinforced Plastic (FRP) abrasion-resistant piping contacted O’Donnell Consulting as its product was being installed for use in the external Limestone Slurry Recycle segments of a Flue Gas Desulfurization System in a power plant in Vietnam.
Desulfurization system piping is subject to thermal and pressure loadings, as well as self-weight, contained fluid weight, operational forces, wind loads and potentially seismic events. We performed various analyses to confirm the structural integrity of the design.
To investigate the behavior of the recycle slurry piping, a three-dimensional finite element model was constructed using ANSYS. Four separate piping runs, designated according to their associated recycle pump identification number comprise the external portion of the recycle slurry piping. Each piping run is similar in layout and geometry, but has differences at the beginning and termination of each run.
The following methodology and assumptions were applied.
1) Small diameter drain lines and vents attached to the large diameter piping was not included in the finite element model(s).
2) Valves and pumps were not included in the models.
3) Flange and field joints were not explicitly included in the piping models.
4) The piping is supported at various locations with vertical spring hangers. The springs were assumed to resist movements in the vertical direction only.
5) Expansion joints were model with a combination of beams, springs, and gap elements.
6) All material behavior was assumed to be linear elastic.
7) For Seismic loading, Occupancy Category of II, the seismic use group was assumed to be I. Zone 1 was assumed with the worst soil profile.
8) The allowable axial stress is based on an ultimate tensile strength of the FRP piping of 9000 psi.
9) Design pressure = 60 psi
10) Design temperature = 180 F
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