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Thermal Sleeve

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.

 

RE: Thermal Sleeve

The ASME  code requires a thermal sleeve on the feedwater connection to a steam drum whose design pressure is above (???) psig. This implies that the thermal fatigue associated with a temperature diference between Tsat  at (???) psig and 80 F is marginally acceptable- a larger temp differential would be unacceptable unless a thermal sleeve is provided. The same logic could be applied as a rule of thumb for the case of the steam coil connections to the mud drum,but it is not a ASME section I code requirement.

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.

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