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Strength Assessment of the Vapor Separator

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Static Strength Assessment of the Water Vapor separator

Figure 1. 3D CAD model of the water vapor separator

Intoduction

In according to conceptual design of a Water Vapor Separator (WVS) FEA Engineering was asked to perform strength calculation of intitial design. 3D model and assembly drawings of WVS are shown in Figures 1-3.

To check strength and deformation of issued design finite element model (FEM) was prepared (Figure 4).

Figure 4. Finite element model of the WVS: a) general view; b) section cut

Loads and constraints

WVS normally operates under the following conditions:

  • internal pressure;
  • vapor temperature.

Structural constraints were applied near connection flanges as shown in Figure 4.

Pressure and temperatures were applied to FEM as shown in Figure 5.

Operational conditions, including pressure pulsating loads, have been determined from CFD calculation report. Pressure distribution and pulsating in low frequency domain are shown in Figures 6 and 7.

Figure 5. Load application visualization: a) internal pressure on elements; b) nodal temperature

a)

b)

Figure 6. Presure distribution at long section of the WVS

Figure 7. Presure pulsating in low frequency domain

Occured results and conclusions

FEM analysis showed that safety factors (less than 1.0) for all analyzed load cases (LC's) weren’t less than allowable value. Safety factors distribution is shown in Figure 8.

Max. displacements for the worst LC is about 7 mm which is acceptable for chosen thermal compensators. Displacements distribution is shown in Figure 9.

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Figure 8. Safety factors distribution

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a)

b)

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Figure 9. Displacements distribution in the WVS structure

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Figure 2. Assembly drawings

Figure 3. Midsection drawings