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Heat transfer Analysis

PIPESTRESS calculates stresses due to temperature gradients in the pipe wall which occur during thermal transients.  The instantaneous temperature distribution in the pipe wall is calculated by solving a one-dimensional, axially symmetric heat transfer problem.

PIPESTRESS calculates the film coefficient from simplified steam table parameters.  For each THERMAL CONDITION, PIPESTRESS generates a HEAT TRANSFER TRACE as shown below.

Thermal gradient stresses may also be calculated externally and entered as input data into PIPESTRESS.

Thermal gradient stresses are documented in PIPESTRESS report F-1.

   D S T   C O M P U T E R   S E R V I C E S   S. A.        G E N E V A                      F-5                   PAGE NO. 220

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 ++ DST/PIPESTRESS ++                  NUCLEAR POWER PLANT S. BOONE                 Version 3.5.0+417  PC         Release: Sep 1999
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     CALCULATION NUMBER 3999         CODE SECTION III CLASS 1  ASME-1977          TEST PROBLEM NO. 1   2001/01/15  14:36:18  [265]
       CLASS 1 ANALYSIS FATIGUE PROTECTION                      INCLUDING STATIC AND SEISMIC LOADS, AND TRANSIENT



                                             ******** CONDITION   1 ********

 ------------TRANSIENT------------  --------PIPE DATA-----------  -----FLUID PROPERTIES-------  ------COMPUTED  DATA--------------
 INIT TEMP = 665.00 F               O.DIA=  16.00 IN              VISCOS IN 10**7 LB SEC/FT**2  FLM COEF IN BTU/HR-FT**2-F
 FINL TEMP = 620.00 F               THICK= 0.5000 IN              PRNDTL IS UNITLESS
 RAMP TIME =      0.10 SEC          COND = 28.300 BTU/HR-FT-F     COND   IN 10**3 BTU/HR-FT-F
 FLOW RATE =   80000.00 GAL/MIN     DIFF =  0.4387 FT**2/HR       SP.VOL IN FT**3/LB
 OUT TEMP  =  70.00 F
 O.FLM COEF=   0.00 BTU/HR-FT**2-F
 INIT PRES = 559.70 PSI
 FINL PRES = 464.70 PSI
 RAMP TIME =   0.10 SEC                                                                         VELOCITY =   145.243 FT/SEC
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* ITER NO=    0   ELAPSED TIME=   0.000    NO.OF SLICES=128   SIZE OF SLICE=0.003906   TIME STEP=   0.00029 *
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  ITER  SECONDS  INSIDE---TEMPERATURE--OUTSIDE   DELT1  DELT2    TA  FLUID TEMP PRES   PRANDTL  VISCOS    COND   SP.VOL   FLM COEF S
     1    0.000  665.0 665.0 665.0 665.0 665.0   0.000  0.000  665.00  664.87  559.425    1.05    4.76   31.05    1.174     233.49 S
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* ITER NO=   30   ELAPSED TIME=   0.009    NO.OF SLICES= 64   SIZE OF SLICE=0.007813   TIME STEP=   0.00116 *
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  ITER  SECONDS  INSIDE---TEMPERATURE--OUTSIDE   DELT1  DELT2    TA  FLUID TEMP PRES   PRANDTL  VISCOS    COND   SP.VOL   FLM COEF S
     1    0.010  665.0 665.0 665.0 665.0 665.0   0.004  0.036  665.00  660.57  550.338    1.05    4.74   30.84    1.180     231.65 S
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* ITER NO=   30   ELAPSED TIME=   0.043    NO.OF SLICES= 32   SIZE OF SLICE=0.015625   TIME STEP=   0.00464 *
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  ITER  SECONDS  INSIDE---TEMPERATURE--OUTSIDE   DELT1  DELT2    TA  FLUID TEMP PRES   PRANDTL  VISCOS    COND   SP.VOL   FLM COEF S
     1    0.048  664.6 665.0 665.0 665.0 665.0   0.087  0.336  664.99  643.35  513.991    1.05    4.66   30.03    1.205     225.22 S
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* ITER NO=   30   ELAPSED TIME=   0.183    NO.OF SLICES= 16   SIZE OF SLICE=0.031250   TIME STEP=   0.01855 *
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  ITER  SECONDS  INSIDE---TEMPERATURE--OUTSIDE   DELT1  DELT2    TA  FLUID TEMP PRES   PRANDTL  VISCOS    COND   SP.VOL   FLM COEF S

 TEMPERATURE RAMP AND PRESSURE RAMP ARE COMPLETED                                         1.06    4.52   29.06     1.417   196.883 S

     1    0.201  663.3 664.9 665.0 665.0 665.0   0.838  1.153  664.84  620.00  464.700
    24    0.628  661.9 664.2 664.9 665.0 665.0   2.389  1.354  664.43  620.00  464.700
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* ITER NO=   30   ELAPSED TIME=   0.739    NO.OF SLICES=  8   SIZE OF SLICE=0.062500   TIME STEP=   0.07420 *
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Last modified: 12/08/09.