PWHT thermocouple
PWHT thermocouple
(OP)
It is stated in ASME sec VIII that it is mandatory to attach thermocouple to the pressure part or vessels when PWHT, if they are more than one part or vessel. In secI nothing is found about this matter. we want to PWHT the drums base on secI and vessels base on secVIII, in a calibrated furnace. Is it realy mandatory to attach the thermocouple to these parts body, if we decide to PWHT them one by one?





RE: PWHT thermocouple
RE: PWHT thermocouple
RE: PWHT thermocouple
RE: PWHT thermocouple
the furnaces use thermocouples to control the heat and guess where is the best place to put the thermocouples,
There is nothing in the books (Code) only is common eng sense.
RE: PWHT thermocouple
RE: PWHT thermocouple
For the advanced metals which have a narrow allowable band of PWHT temps ( eg P91), multiple thermocouples and recirc fans in the furnace ( to minimize temp stratification) may be required. Else, a hardness traverse of the vessel following PWHT may be needed to confirm proper PWHT.
When we obtain heat treated parts from overseas foundries, they normal provide the chart recorder output for the PWHT thermocuoples.
RE: PWHT thermocouple