PWHT TIME

At first, we have to define the specification (type & grade) of that carbon steel material. Suppose we have a carbon steel material with P-No. 1, Gr. Nos. 1, 2, 3:

According to ASME Code, Section VIII, Div. 1, Para. UCS-56 and Table UCS-56:

• Normal Heating Temp. : 1100 ^oF (595 ^oC)

• Rate of Heating : ≤ 400 ^oF / hr (222 ^oC) divided by thickness in inches

• Rate of Cooling : 500 ^oF / hr (280 ^oC) divided by thickness in inches

Heating time = (1100-70) ^oF /[(400 ^oF/hr) (40 mm/25 mm)] = 1.61 hr (1 hr & 40 minutes)

Min. Holding Time = 1 hr / inch (25 mm) = (1 hr / 25 mm)(40 mm) = 1.6 hr (1 hr & 40 minutes)

Cooling time = (1100-70) ^oF /[(500 ^oF/hr) (40 mm/25 mm)] = 1.29 hr(1 hr & 20 minutes)

Dear vishnus_2184,

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See the following PWHT-Example in PDF format.
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thanx !!!!!