If it is deemed necessary to insulate the pipe then the flanges (and valves etc) should also be insulated except for hydrogen service or for hydrocarbons above their auto ignition temperature. For these duties the flanges should be left bare or with only personnel protection.

Flange insulation should be in the form of removable covers.

Mr Prof ,

Thkx 4 ur reply . I do appreciate ur comments but , will it be scenario even though the flanges experiencing high heat loss and affects the process.

Regards

Earnest.

Congratulations on 100 good answers Abdel Halim Galala!

Your service to all in the area of steel and codes is appreciated!

Milo

Many thanks Milo,

And many thanks to all members and participants of CR4 forum.

Abdel Halim

hi, I think that insulating the flanges on Hydrocarbon service can be dangerous; in case of leak you might not be able to recognize it until the leak is big. also leak check, periodic or during startups(when lines and equipments have been opened), on these flanges is impossible.

in my previuos experiences in petrochemical plants flanges were never insulated.

regards

Giova

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