تفسیر QW-407.2 از استاندارد ASME سکشن ۹

MIN PWHT (SOAKING TIME )

ساعت 5.4=0.8÷6.75

1 minute =

0.0166666667 hours

:Example 

Time of PWHT is qualified as 1.25x that of the PQR, e.g., 4 hours at temperature qualifies for 5 hours total time and temperature range and may be applied in one cycle.

4x1.25=5