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earnestpaul
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Join Date: Jun 2008
Location: Gujarat
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Flange Insulation of Hydrocarbon Lines

09/25/2009 12:07 AM

Dear All,

Is Insulation required on the flanges of hydrocarbon services ? we experience a severe heat loss on these flanges .

Regards

Earnest.
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The Prof
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Engineering Fields - Mechanical Engineering - New Member Hobbies - CNC - New Member

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Location: Western Australia
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#1

Re: Flange Insulation of Hydrocarbon Lines

09/25/2009 2:57 AM

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.

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earnestpaul
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#2
In reply to #1

Re: Flange Insulation of Hydrocarbon Lines

09/25/2009 4:46 AM

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.
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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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#3

Re: Flange Insulation of Hydrocarbon Lines

09/26/2009 1:02 AM

• Flange insulation is not a definite term, because it may be means hot/cold insulation or electrical/cathodic insulation of those flanges.

• For flange insulation related to heat loss, the rate of heat losses from piping components such as flanges and valves is greater than the normal rate of heat loss in pipeline itself, and this is due to the heavy bulk materials located at these components. So, it is very essential to hot/cold insulate the flanges like as valves.

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Milo
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#4
In reply to #3

Re: Flange Insulation of Hydrocarbon Lines

09/26/2009 5:29 PM

Congratulations on 100 good answers Abdel Halim Galala!

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

Milo

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Abdel Halim Galala
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#5
In reply to #4

Re: Flange Insulation of Hydrocarbon Lines

09/26/2009 11:36 PM

Many thanks Milo,

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

Abdel Halim

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Anonymous Poster
#7
In reply to #3

Re: Flange Insulation of Hydrocarbon Lines

11/08/2009 12:50 PM

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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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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Location: Cairo, Egypt
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Good Answers: 248
#6

Re: Flange Insulation of Hydrocarbon Lines

11/07/2009 11:02 PM

.

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