Thermal Sleeve
Thermal Sleeve
(OP)
Hai,
I have a question on mud drum in a boiler where we are going to introduce steam coil heater. The boier design pressure is 400 psi. And the coil heater is 300 psi@ sat. My question is does the nozzle require thermal sleeve. Or what temp diefferential does the ASME Section I code allows not to have one.
I have a question on mud drum in a boiler where we are going to introduce steam coil heater. The boier design pressure is 400 psi. And the coil heater is 300 psi@ sat. My question is does the nozzle require thermal sleeve. Or what temp diefferential does the ASME Section I code allows not to have one.





RE: Thermal Sleeve
You can find other rules of thumb for use of thermal sleeves from condenser mfr's- I believe they assume the plant is base loaded and they will require a thermal sleeve if the incoming steam dump is more than 300F hotter than the condenser normal casing temp ( perhaps 120 F + 300 F). Yuo shuld use a smaller temp diff if the unit is cycled.
A more sophisticated method of determining if the sleeve is required is conduct a fatigue analysis , using either ASME sect VIII div 2 or the EU PED codes.