PWHT time calculation

[Student]

Dear All

Please guide how to calculate the rate of heating for PWHT for below AWS d1.1

"Para 7.8.1 Above 600°F [3 1 5 °C] , the rate of heating in °F [°C] per hour shall not exceed 400 [560] divided by the maximum
metal thickness of the thicker part, in inches [centimeters ] , but in no case more than 400°F [220°C] per hour"

If the maximum thickness is 2 inches , how to calculate heating rate

[Rathinavel Arumugam]

As per 7.8.1, para 2,

rate of heating ia 560/2"= 280Deg.C

But there is a condition that "but in no case more than 220Deg.C per hour.

Hence you have to apply 220 Deg. C per hour. 

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[manohar g]

Dear Nabeel,

As per AWS D1.1, rate of heating shall not exceed 400°F (560°C) divided by max. Metal thickness of thicker part, in inches (cm), but in no case more than 400°F (220°C) per hour.

If the maximum thickness is 2” (5.08cm), rate of heating will be

400°F / 2” = 200°F per hour.

Or

560°C / 5.08cm = 110°C per hour

Hence, for 2 inch thick, rate of heating shall not exceed 200°F per hour or 110°C per hour.

Note : If the calculated rate of heating temperature is more than 220°C, consider rate of heating max. 220°C.

 

As per ASME Sec. VIII Div. 1, rate of heating shall be not more than 400°F/hr (222°C/h) divided by the maximum metal thickness of the shell or head material in inches, but in no case more than 400°F/hr (222°C/h).

 

If the maximum thickness is 2”, rate of heating will be

400°F / 2” = 200°F per hour.

Or

222°C / 2” = 111°C per hour.

Regards,

G.Manohar

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