[MW:13563] Interpret IX-04-15

Dear Expert
.
According to interpretation below could you please explain why the
answer is "No". In my understanding WPS has change only time range but
doesn't change in the temperature(logic "and" mean change both time
and temperature).

In SEC IX QW-407.2 state that "A change in the postweld heat
treatment (see QW-407.1) temperature and time range"

Interpretation: IX-04-15
Subject: QW-403.7, Base Metal Thickness Qualification and QW-407.2,
PWHT Temperature and Time
Range
Date Issued: December 22, 2004
File: BC04-1595
Question (1): Will a procedure qualification test coupon on 1.5 in.
thick P-No. I, Gr. 2 material and
postweld heat-treated at I,lOO°F for 1.5 hr with supplementary
essential variable requirements met, support
a WPS with supplementary essential variable requirements for
production welding on 8 in. thick P-No. 1,
Gr. 2 material that is PWHT at l,lOO°F for 3.5 hr?
Reply (1): No

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