COMPUTATIONAL FLUID DYNAMICS

PIPING ENGINEERING AND PIPING DESIGN

This study is for educational purposes only. No commercial purposes intended.

SAMPLE PIPE FITTINGS around GAS-STEAM TURBINE COMBINED CYCLE 160, 650, 1000 MW POWER PLANT

PIPE

MATERIALS USED IN SIMULATION OF SATURATED STEAM

FLANGE

FITTINGS USED IN SIMULATION

THERMODYNAMIC PROPERTIES OF STEAM

THERMODYNAMIC PROPERTIES OF SATURATED STEAM AT 200-CELCIUS AND 15.54 BAR (225.39 PSI)

AN ASSEMBLY OF MATED FLANGED JOINT USING ASME B16.5 WELD NECK FLANGE 300# WITH STUD BOLTS NUTS AND WASHERS, FITTED TO BUTT WELDED PIPE S80. NOTE THAT WE DID NOT TAKE INTO CONSIDERATION THE WELD PROFILE FOR THE PIPE JOINTS (Butt Welds between flange and pipe).

CLOSED BOUNDARY OF PIPE FLOW EXPOSING THE STUD BOLTS ARRANGEMENT.

SHOWING THE SPIRAL WOUND GASKET FITTED TO RAISED FACED OF FLANGES. THE FLUID FOR THIS STUDY IS SATURATED STEAM AS INDICATED IN THE LOWER LEFT CORNER OF THE SCREEN.

MESHING FOR SMALL PARTS AND EDGES.

STEAM VELOCITY(Z-AXIS) AND TEMPERATURE(Y-AXIS) ASSUMING A CONTANT TEMP AT BOUNDARY CONDITIONS.

SHEAR STRESS AT ZX (TAU-ZX) PLANE.

CONVERGENCE PLOT

Showing the convergence plot when the fluid pressure and temperature were increased from 225 to 380 and 200 to 680 respectively.

PRESSURE/TEMPERATURE DISTRIBUTION

Heat and pressure distribution towards the outlet of boundary conditions where there is an abrupt change of pressure and temperature. Note that the distance of the second boundary condition to Face of Flange (FOF) is just 19.568-in. The intent of this scenario is to check how the change of conditions will affect the mating flange and to determine the possible thermowell or pressure transmitter location or any type of operating sensors to get the most accurate results of gauge reading.

FLOW TRACERS

Temperature quantity color by Shear Stress XY (Tau-XY) with Wall Heat Flux as the vector set. Notice of the affected bolts by position which might affect the bolt tensioning requirement or bolt material to be used. This observation needs to be verified by thermal analysis for the correct thermal stress distribution.

PRESSURE-TEMPERATURE DISTRIBUTION

Temperature vectors with wall heat flux. Interesting to see that most of the evaporating steam has more dispersed area of thermal conduction. However, there is also a substantial heat dispersion in the lower quadrant which might be caused of steam condensate.

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