2 replies to this topic

We are operating our 1100 MeT/Day ammonia plant with three types of steam

S/No / Steam Type / Temperature, C / Pressure, Kg /Cm2
1 / KS / 515 / 105
2 / HS / 385 / 38
3 / LS / 250 / 3.8


Flanges on these lines are not insulated due to apprehension that it may cause leakage through flanges owing to overheating of studs / bolts (thermal expansion).

These flanges are considerable source for energy loss.

Do you have an experience for using insulation jackets or coating on above flanges for energy saving?


From where I can get information about these?

Regards,
Sohail

[Pronab]

Sohail:

Keep this flange naked. I have experienced the same type of steam service and I found there were no insulation on this flanges. Think about how much energy
you lost from the flange. Very negligible.

Moreover, flange is in combustible gas service with a high temperature (Temperature range I can not remember now, maybe ~ 400 oF.) should be naked also, like inlet of HTS reactor where the temperature is arround 340 oC. There is a specific API regulation also regarding this type of insulation.

Regards.
Pronab.

[PKS]

Dear Sohail/Pronab

I had the same experience as told to you (by Pronab) in a petrochemical complex. Recently, I have seen insulation of Steam line flanges as well as Valves, in recently built petrochemical complex.

PKS