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# PWHT Time Calculation

## PWHT Time Calculation

(OP)
A Half inch thick plate is to be PWTH ed. The rate of heating and cooling shall be at a pace of 500 degrees F per hour per inch.What is the total time required for PWHT, if the material is heated from 600 degrees to 1350 degrees F , soak for 6 hours and cool from 1350 to 600 degree .?

### RE: PWHT Time Calculation

Code of Construction is required. You state rate of heating/cooling to be 500F/hr per inch. This would mean 1000F/hr for 1/2". I know of no Construction Codes that will allow this much heating/cooling...maybe the farm code.

### RE: PWHT Time Calculation

Sounds like an exam question to me...

Regards

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

### RE: PWHT Time Calculation

(OP)
Dear David and SnTman
This was an exam question. If the heating rate is 500 degrees per hour per inch, how much time required for half inch.
Thanks

### RE: PWHT Time Calculation

39 min + 6 hrs + 39 min

DHURJATI SEN
Kolkata, India

### RE: PWHT Time Calculation

39 mins?!? That's like 1154F/hr.

### RE: PWHT Time Calculation

(OP)
Dear

Can anyone tell what is the time required for half inch plate to heat 250F is the heat of rating is 500F per hour per inch

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