weld have been used (Fig. 10). Therefore, Paris constants of product
and material should be used for reliable predictions.
In order to validate the suitability of FCGR curve given in ASME
for prediction of crack growth in pipe and pipe welds with part
through cracks, analyses have been further carried out using Paris
constants from ASME. The results for pipe (SSPB 12-12) and pipe
weld (SSPW 12-10) are shown in Figs. 18 and 19 respectively. The
results indicate that the prediction is very conservative for pipe
(SSPB 12-12) and compares well for pipe weld (SSPW 12-10).
Singh et al [18] have shown that fracture resistance of base is
significantly higher as compared that of weld (SMAW). In present
study also FCG resistance in case of base is significantly higher than
that of weld. This study infers that for realistic assessment of the
piping material behavior, Paris constants of the actual product
should be used for analytical predictions.